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@@ -461,3 +461,4 @@ evalkit_cambrian/lib/python3.10/site-packages/cv2/qt/fonts/DejaVuSansCondensed-O
 janus/lib/python3.10/site-packages/pip/_vendor/pkg_resources/__pycache__/__init__.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
 janus/lib/python3.10/site-packages/regex/__pycache__/test_regex.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
 janus/lib/python3.10/site-packages/numpy/ma/__pycache__/core.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
+janus/lib/python3.10/site-packages/numpy/linalg/__pycache__/_linalg.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text

janus/lib/python3.10/asyncio/__init__.py

@@ -0,0 +1,43 @@
+"""The asyncio package, tracking PEP 3156."""
+
+# flake8: noqa
+
+import sys
+
+# This relies on each of the submodules having an __all__ variable.
+from .base_events import *
+from .coroutines import *
+from .events import *
+from .exceptions import *
+from .futures import *
+from .locks import *
+from .protocols import *
+from .runners import *
+from .queues import *
+from .streams import *
+from .subprocess import *
+from .tasks import *
+from .threads import *
+from .transports import *
+
+__all__ = (base_events.__all__ +
+           coroutines.__all__ +
+           events.__all__ +
+           exceptions.__all__ +
+           futures.__all__ +
+           locks.__all__ +
+           protocols.__all__ +
+           runners.__all__ +
+           queues.__all__ +
+           streams.__all__ +
+           subprocess.__all__ +
+           tasks.__all__ +
+           threads.__all__ +
+           transports.__all__)
+
+if sys.platform == 'win32':  # pragma: no cover
+    from .windows_events import *
+    __all__ += windows_events.__all__
+else:
+    from .unix_events import *  # pragma: no cover
+    __all__ += unix_events.__all__

janus/lib/python3.10/asyncio/__main__.py

@@ -0,0 +1,127 @@
+import ast
+import asyncio
+import code
+import concurrent.futures
+import inspect
+import sys
+import threading
+import types
+import warnings
+
+from . import futures
+
+
+class AsyncIOInteractiveConsole(code.InteractiveConsole):
+
+    def __init__(self, locals, loop):
+        super().__init__(locals)
+        self.compile.compiler.flags |= ast.PyCF_ALLOW_TOP_LEVEL_AWAIT
+
+        self.loop = loop
+
+    def runcode(self, code):
+        future = concurrent.futures.Future()
+
+        def callback():
+            global repl_future
+            global repl_future_interrupted
+
+            repl_future = None
+            repl_future_interrupted = False
+
+            func = types.FunctionType(code, self.locals)
+            try:
+                coro = func()
+            except SystemExit:
+                raise
+            except KeyboardInterrupt as ex:
+                repl_future_interrupted = True
+                future.set_exception(ex)
+                return
+            except BaseException as ex:
+                future.set_exception(ex)
+                return
+
+            if not inspect.iscoroutine(coro):
+                future.set_result(coro)
+                return
+
+            try:
+                repl_future = self.loop.create_task(coro)
+                futures._chain_future(repl_future, future)
+            except BaseException as exc:
+                future.set_exception(exc)
+
+        loop.call_soon_threadsafe(callback)
+
+        try:
+            return future.result()
+        except SystemExit:
+            raise
+        except BaseException:
+            if repl_future_interrupted:
+                self.write("\nKeyboardInterrupt\n")
+            else:
+                self.showtraceback()
+
+
+class REPLThread(threading.Thread):
+
+    def run(self):
+        try:
+            banner = (
+                f'asyncio REPL {sys.version} on {sys.platform}\n'
+                f'Use "await" directly instead of "asyncio.run()".\n'
+                f'Type "help", "copyright", "credits" or "license" '
+                f'for more information.\n'
+                f'{getattr(sys, "ps1", ">>> ")}import asyncio'
+            )
+
+            console.interact(
+                banner=banner,
+                exitmsg='exiting asyncio REPL...')
+        finally:
+            warnings.filterwarnings(
+                'ignore',
+                message=r'^coroutine .* was never awaited$',
+                category=RuntimeWarning)
+
+            loop.call_soon_threadsafe(loop.stop)
+
+
+if __name__ == '__main__':
+    sys.audit("cpython.run_stdin")
+
+    loop = asyncio.new_event_loop()
+    asyncio.set_event_loop(loop)
+
+    repl_locals = {'asyncio': asyncio}
+    for key in {'__name__', '__package__',
+                '__loader__', '__spec__',
+                '__builtins__', '__file__'}:
+        repl_locals[key] = locals()[key]
+
+    console = AsyncIOInteractiveConsole(repl_locals, loop)
+
+    repl_future = None
+    repl_future_interrupted = False
+
+    try:
+        import readline  # NoQA
+    except ImportError:
+        pass
+
+    repl_thread = REPLThread()
+    repl_thread.daemon = True
+    repl_thread.start()
+
+    while True:
+        try:
+            loop.run_forever()
+        except KeyboardInterrupt:
+            if repl_future and not repl_future.done():
+                repl_future.cancel()
+                repl_future_interrupted = True
+            continue
+        else:
+            break

janus/lib/python3.10/asyncio/base_events.py

@@ -0,0 +1,1934 @@
+"""Base implementation of event loop.
+
+The event loop can be broken up into a multiplexer (the part
+responsible for notifying us of I/O events) and the event loop proper,
+which wraps a multiplexer with functionality for scheduling callbacks,
+immediately or at a given time in the future.
+
+Whenever a public API takes a callback, subsequent positional
+arguments will be passed to the callback if/when it is called.  This
+avoids the proliferation of trivial lambdas implementing closures.
+Keyword arguments for the callback are not supported; this is a
+conscious design decision, leaving the door open for keyword arguments
+to modify the meaning of the API call itself.
+"""
+
+import collections
+import collections.abc
+import concurrent.futures
+import functools
+import heapq
+import itertools
+import os
+import socket
+import stat
+import subprocess
+import threading
+import time
+import traceback
+import sys
+import warnings
+import weakref
+
+try:
+    import ssl
+except ImportError:  # pragma: no cover
+    ssl = None
+
+from . import constants
+from . import coroutines
+from . import events
+from . import exceptions
+from . import futures
+from . import protocols
+from . import sslproto
+from . import staggered
+from . import tasks
+from . import transports
+from . import trsock
+from .log import logger
+
+
+__all__ = 'BaseEventLoop','Server',
+
+
+# Minimum number of _scheduled timer handles before cleanup of
+# cancelled handles is performed.
+_MIN_SCHEDULED_TIMER_HANDLES = 100
+
+# Minimum fraction of _scheduled timer handles that are cancelled
+# before cleanup of cancelled handles is performed.
+_MIN_CANCELLED_TIMER_HANDLES_FRACTION = 0.5
+
+
+_HAS_IPv6 = hasattr(socket, 'AF_INET6')
+
+# Maximum timeout passed to select to avoid OS limitations
+MAXIMUM_SELECT_TIMEOUT = 24 * 3600
+
+# Used for deprecation and removal of `loop.create_datagram_endpoint()`'s
+# *reuse_address* parameter
+_unset = object()
+
+
+def _format_handle(handle):
+    cb = handle._callback
+    if isinstance(getattr(cb, '__self__', None), tasks.Task):
+        # format the task
+        return repr(cb.__self__)
+    else:
+        return str(handle)
+
+
+def _format_pipe(fd):
+    if fd == subprocess.PIPE:
+        return '<pipe>'
+    elif fd == subprocess.STDOUT:
+        return '<stdout>'
+    else:
+        return repr(fd)
+
+
+def _set_reuseport(sock):
+    if not hasattr(socket, 'SO_REUSEPORT'):
+        raise ValueError('reuse_port not supported by socket module')
+    else:
+        try:
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
+        except OSError:
+            raise ValueError('reuse_port not supported by socket module, '
+                             'SO_REUSEPORT defined but not implemented.')
+
+
+def _ipaddr_info(host, port, family, type, proto, flowinfo=0, scopeid=0):
+    # Try to skip getaddrinfo if "host" is already an IP. Users might have
+    # handled name resolution in their own code and pass in resolved IPs.
+    if not hasattr(socket, 'inet_pton'):
+        return
+
+    if proto not in {0, socket.IPPROTO_TCP, socket.IPPROTO_UDP} or \
+            host is None:
+        return None
+
+    if type == socket.SOCK_STREAM:
+        proto = socket.IPPROTO_TCP
+    elif type == socket.SOCK_DGRAM:
+        proto = socket.IPPROTO_UDP
+    else:
+        return None
+
+    if port is None:
+        port = 0
+    elif isinstance(port, bytes) and port == b'':
+        port = 0
+    elif isinstance(port, str) and port == '':
+        port = 0
+    else:
+        # If port's a service name like "http", don't skip getaddrinfo.
+        try:
+            port = int(port)
+        except (TypeError, ValueError):
+            return None
+
+    if family == socket.AF_UNSPEC:
+        afs = [socket.AF_INET]
+        if _HAS_IPv6:
+            afs.append(socket.AF_INET6)
+    else:
+        afs = [family]
+
+    if isinstance(host, bytes):
+        host = host.decode('idna')
+    if '%' in host:
+        # Linux's inet_pton doesn't accept an IPv6 zone index after host,
+        # like '::1%lo0'.
+        return None
+
+    for af in afs:
+        try:
+            socket.inet_pton(af, host)
+            # The host has already been resolved.
+            if _HAS_IPv6 and af == socket.AF_INET6:
+                return af, type, proto, '', (host, port, flowinfo, scopeid)
+            else:
+                return af, type, proto, '', (host, port)
+        except OSError:
+            pass
+
+    # "host" is not an IP address.
+    return None
+
+
+def _interleave_addrinfos(addrinfos, first_address_family_count=1):
+    """Interleave list of addrinfo tuples by family."""
+    # Group addresses by family
+    addrinfos_by_family = collections.OrderedDict()
+    for addr in addrinfos:
+        family = addr[0]
+        if family not in addrinfos_by_family:
+            addrinfos_by_family[family] = []
+        addrinfos_by_family[family].append(addr)
+    addrinfos_lists = list(addrinfos_by_family.values())
+
+    reordered = []
+    if first_address_family_count > 1:
+        reordered.extend(addrinfos_lists[0][:first_address_family_count - 1])
+        del addrinfos_lists[0][:first_address_family_count - 1]
+    reordered.extend(
+        a for a in itertools.chain.from_iterable(
+            itertools.zip_longest(*addrinfos_lists)
+        ) if a is not None)
+    return reordered
+
+
+def _run_until_complete_cb(fut):
+    if not fut.cancelled():
+        exc = fut.exception()
+        if isinstance(exc, (SystemExit, KeyboardInterrupt)):
+            # Issue #22429: run_forever() already finished, no need to
+            # stop it.
+            return
+    futures._get_loop(fut).stop()
+
+
+if hasattr(socket, 'TCP_NODELAY'):
+    def _set_nodelay(sock):
+        if (sock.family in {socket.AF_INET, socket.AF_INET6} and
+                sock.type == socket.SOCK_STREAM and
+                sock.proto == socket.IPPROTO_TCP):
+            sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
+else:
+    def _set_nodelay(sock):
+        pass
+
+
+def _check_ssl_socket(sock):
+    if ssl is not None and isinstance(sock, ssl.SSLSocket):
+        raise TypeError("Socket cannot be of type SSLSocket")
+
+
+class _SendfileFallbackProtocol(protocols.Protocol):
+    def __init__(self, transp):
+        if not isinstance(transp, transports._FlowControlMixin):
+            raise TypeError("transport should be _FlowControlMixin instance")
+        self._transport = transp
+        self._proto = transp.get_protocol()
+        self._should_resume_reading = transp.is_reading()
+        self._should_resume_writing = transp._protocol_paused
+        transp.pause_reading()
+        transp.set_protocol(self)
+        if self._should_resume_writing:
+            self._write_ready_fut = self._transport._loop.create_future()
+        else:
+            self._write_ready_fut = None
+
+    async def drain(self):
+        if self._transport.is_closing():
+            raise ConnectionError("Connection closed by peer")
+        fut = self._write_ready_fut
+        if fut is None:
+            return
+        await fut
+
+    def connection_made(self, transport):
+        raise RuntimeError("Invalid state: "
+                           "connection should have been established already.")
+
+    def connection_lost(self, exc):
+        if self._write_ready_fut is not None:
+            # Never happens if peer disconnects after sending the whole content
+            # Thus disconnection is always an exception from user perspective
+            if exc is None:
+                self._write_ready_fut.set_exception(
+                    ConnectionError("Connection is closed by peer"))
+            else:
+                self._write_ready_fut.set_exception(exc)
+        self._proto.connection_lost(exc)
+
+    def pause_writing(self):
+        if self._write_ready_fut is not None:
+            return
+        self._write_ready_fut = self._transport._loop.create_future()
+
+    def resume_writing(self):
+        if self._write_ready_fut is None:
+            return
+        self._write_ready_fut.set_result(False)
+        self._write_ready_fut = None
+
+    def data_received(self, data):
+        raise RuntimeError("Invalid state: reading should be paused")
+
+    def eof_received(self):
+        raise RuntimeError("Invalid state: reading should be paused")
+
+    async def restore(self):
+        self._transport.set_protocol(self._proto)
+        if self._should_resume_reading:
+            self._transport.resume_reading()
+        if self._write_ready_fut is not None:
+            # Cancel the future.
+            # Basically it has no effect because protocol is switched back,
+            # no code should wait for it anymore.
+            self._write_ready_fut.cancel()
+        if self._should_resume_writing:
+            self._proto.resume_writing()
+
+
+class Server(events.AbstractServer):
+
+    def __init__(self, loop, sockets, protocol_factory, ssl_context, backlog,
+                 ssl_handshake_timeout):
+        self._loop = loop
+        self._sockets = sockets
+        self._active_count = 0
+        self._waiters = []
+        self._protocol_factory = protocol_factory
+        self._backlog = backlog
+        self._ssl_context = ssl_context
+        self._ssl_handshake_timeout = ssl_handshake_timeout
+        self._serving = False
+        self._serving_forever_fut = None
+
+    def __repr__(self):
+        return f'<{self.__class__.__name__} sockets={self.sockets!r}>'
+
+    def _attach(self):
+        assert self._sockets is not None
+        self._active_count += 1
+
+    def _detach(self):
+        assert self._active_count > 0
+        self._active_count -= 1
+        if self._active_count == 0 and self._sockets is None:
+            self._wakeup()
+
+    def _wakeup(self):
+        waiters = self._waiters
+        self._waiters = None
+        for waiter in waiters:
+            if not waiter.done():
+                waiter.set_result(waiter)
+
+    def _start_serving(self):
+        if self._serving:
+            return
+        self._serving = True
+        for sock in self._sockets:
+            sock.listen(self._backlog)
+            self._loop._start_serving(
+                self._protocol_factory, sock, self._ssl_context,
+                self, self._backlog, self._ssl_handshake_timeout)
+
+    def get_loop(self):
+        return self._loop
+
+    def is_serving(self):
+        return self._serving
+
+    @property
+    def sockets(self):
+        if self._sockets is None:
+            return ()
+        return tuple(trsock.TransportSocket(s) for s in self._sockets)
+
+    def close(self):
+        sockets = self._sockets
+        if sockets is None:
+            return
+        self._sockets = None
+
+        for sock in sockets:
+            self._loop._stop_serving(sock)
+
+        self._serving = False
+
+        if (self._serving_forever_fut is not None and
+                not self._serving_forever_fut.done()):
+            self._serving_forever_fut.cancel()
+            self._serving_forever_fut = None
+
+        if self._active_count == 0:
+            self._wakeup()
+
+    async def start_serving(self):
+        self._start_serving()
+        # Skip one loop iteration so that all 'loop.add_reader'
+        # go through.
+        await tasks.sleep(0)
+
+    async def serve_forever(self):
+        if self._serving_forever_fut is not None:
+            raise RuntimeError(
+                f'server {self!r} is already being awaited on serve_forever()')
+        if self._sockets is None:
+            raise RuntimeError(f'server {self!r} is closed')
+
+        self._start_serving()
+        self._serving_forever_fut = self._loop.create_future()
+
+        try:
+            await self._serving_forever_fut
+        except exceptions.CancelledError:
+            try:
+                self.close()
+                await self.wait_closed()
+            finally:
+                raise
+        finally:
+            self._serving_forever_fut = None
+
+    async def wait_closed(self):
+        if self._sockets is None or self._waiters is None:
+            return
+        waiter = self._loop.create_future()
+        self._waiters.append(waiter)
+        await waiter
+
+
+class BaseEventLoop(events.AbstractEventLoop):
+
+    def __init__(self):
+        self._timer_cancelled_count = 0
+        self._closed = False
+        self._stopping = False
+        self._ready = collections.deque()
+        self._scheduled = []
+        self._default_executor = None
+        self._internal_fds = 0
+        # Identifier of the thread running the event loop, or None if the
+        # event loop is not running
+        self._thread_id = None
+        self._clock_resolution = time.get_clock_info('monotonic').resolution
+        self._exception_handler = None
+        self.set_debug(coroutines._is_debug_mode())
+        # In debug mode, if the execution of a callback or a step of a task
+        # exceed this duration in seconds, the slow callback/task is logged.
+        self.slow_callback_duration = 0.1
+        self._current_handle = None
+        self._task_factory = None
+        self._coroutine_origin_tracking_enabled = False
+        self._coroutine_origin_tracking_saved_depth = None
+
+        # A weak set of all asynchronous generators that are
+        # being iterated by the loop.
+        self._asyncgens = weakref.WeakSet()
+        # Set to True when `loop.shutdown_asyncgens` is called.
+        self._asyncgens_shutdown_called = False
+        # Set to True when `loop.shutdown_default_executor` is called.
+        self._executor_shutdown_called = False
+
+    def __repr__(self):
+        return (
+            f'<{self.__class__.__name__} running={self.is_running()} '
+            f'closed={self.is_closed()} debug={self.get_debug()}>'
+        )
+
+    def create_future(self):
+        """Create a Future object attached to the loop."""
+        return futures.Future(loop=self)
+
+    def create_task(self, coro, *, name=None):
+        """Schedule a coroutine object.
+
+        Return a task object.
+        """
+        self._check_closed()
+        if self._task_factory is None:
+            task = tasks.Task(coro, loop=self, name=name)
+            if task._source_traceback:
+                del task._source_traceback[-1]
+        else:
+            task = self._task_factory(self, coro)
+            tasks._set_task_name(task, name)
+
+        return task
+
+    def set_task_factory(self, factory):
+        """Set a task factory that will be used by loop.create_task().
+
+        If factory is None the default task factory will be set.
+
+        If factory is a callable, it should have a signature matching
+        '(loop, coro)', where 'loop' will be a reference to the active
+        event loop, 'coro' will be a coroutine object.  The callable
+        must return a Future.
+        """
+        if factory is not None and not callable(factory):
+            raise TypeError('task factory must be a callable or None')
+        self._task_factory = factory
+
+    def get_task_factory(self):
+        """Return a task factory, or None if the default one is in use."""
+        return self._task_factory
+
+    def _make_socket_transport(self, sock, protocol, waiter=None, *,
+                               extra=None, server=None):
+        """Create socket transport."""
+        raise NotImplementedError
+
+    def _make_ssl_transport(
+            self, rawsock, protocol, sslcontext, waiter=None,
+            *, server_side=False, server_hostname=None,
+            extra=None, server=None,
+            ssl_handshake_timeout=None,
+            call_connection_made=True):
+        """Create SSL transport."""
+        raise NotImplementedError
+
+    def _make_datagram_transport(self, sock, protocol,
+                                 address=None, waiter=None, extra=None):
+        """Create datagram transport."""
+        raise NotImplementedError
+
+    def _make_read_pipe_transport(self, pipe, protocol, waiter=None,
+                                  extra=None):
+        """Create read pipe transport."""
+        raise NotImplementedError
+
+    def _make_write_pipe_transport(self, pipe, protocol, waiter=None,
+                                   extra=None):
+        """Create write pipe transport."""
+        raise NotImplementedError
+
+    async def _make_subprocess_transport(self, protocol, args, shell,
+                                         stdin, stdout, stderr, bufsize,
+                                         extra=None, **kwargs):
+        """Create subprocess transport."""
+        raise NotImplementedError
+
+    def _write_to_self(self):
+        """Write a byte to self-pipe, to wake up the event loop.
+
+        This may be called from a different thread.
+
+        The subclass is responsible for implementing the self-pipe.
+        """
+        raise NotImplementedError
+
+    def _process_events(self, event_list):
+        """Process selector events."""
+        raise NotImplementedError
+
+    def _check_closed(self):
+        if self._closed:
+            raise RuntimeError('Event loop is closed')
+
+    def _check_default_executor(self):
+        if self._executor_shutdown_called:
+            raise RuntimeError('Executor shutdown has been called')
+
+    def _asyncgen_finalizer_hook(self, agen):
+        self._asyncgens.discard(agen)
+        if not self.is_closed():
+            self.call_soon_threadsafe(self.create_task, agen.aclose())
+
+    def _asyncgen_firstiter_hook(self, agen):
+        if self._asyncgens_shutdown_called:
+            warnings.warn(
+                f"asynchronous generator {agen!r} was scheduled after "
+                f"loop.shutdown_asyncgens() call",
+                ResourceWarning, source=self)
+
+        self._asyncgens.add(agen)
+
+    async def shutdown_asyncgens(self):
+        """Shutdown all active asynchronous generators."""
+        self._asyncgens_shutdown_called = True
+
+        if not len(self._asyncgens):
+            # If Python version is <3.6 or we don't have any asynchronous
+            # generators alive.
+            return
+
+        closing_agens = list(self._asyncgens)
+        self._asyncgens.clear()
+
+        results = await tasks.gather(
+            *[ag.aclose() for ag in closing_agens],
+            return_exceptions=True)
+
+        for result, agen in zip(results, closing_agens):
+            if isinstance(result, Exception):
+                self.call_exception_handler({
+                    'message': f'an error occurred during closing of '
+                               f'asynchronous generator {agen!r}',
+                    'exception': result,
+                    'asyncgen': agen
+                })
+
+    async def shutdown_default_executor(self):
+        """Schedule the shutdown of the default executor."""
+        self._executor_shutdown_called = True
+        if self._default_executor is None:
+            return
+        future = self.create_future()
+        thread = threading.Thread(target=self._do_shutdown, args=(future,))
+        thread.start()
+        try:
+            await future
+        finally:
+            thread.join()
+
+    def _do_shutdown(self, future):
+        try:
+            self._default_executor.shutdown(wait=True)
+            if not self.is_closed():
+                self.call_soon_threadsafe(future.set_result, None)
+        except Exception as ex:
+            if not self.is_closed():
+                self.call_soon_threadsafe(future.set_exception, ex)
+
+    def _check_running(self):
+        if self.is_running():
+            raise RuntimeError('This event loop is already running')
+        if events._get_running_loop() is not None:
+            raise RuntimeError(
+                'Cannot run the event loop while another loop is running')
+
+    def run_forever(self):
+        """Run until stop() is called."""
+        self._check_closed()
+        self._check_running()
+        self._set_coroutine_origin_tracking(self._debug)
+
+        old_agen_hooks = sys.get_asyncgen_hooks()
+        try:
+            self._thread_id = threading.get_ident()
+            sys.set_asyncgen_hooks(firstiter=self._asyncgen_firstiter_hook,
+                                   finalizer=self._asyncgen_finalizer_hook)
+
+            events._set_running_loop(self)
+            while True:
+                self._run_once()
+                if self._stopping:
+                    break
+        finally:
+            self._stopping = False
+            self._thread_id = None
+            events._set_running_loop(None)
+            self._set_coroutine_origin_tracking(False)
+            sys.set_asyncgen_hooks(*old_agen_hooks)
+
+    def run_until_complete(self, future):
+        """Run until the Future is done.
+
+        If the argument is a coroutine, it is wrapped in a Task.
+
+        WARNING: It would be disastrous to call run_until_complete()
+        with the same coroutine twice -- it would wrap it in two
+        different Tasks and that can't be good.
+
+        Return the Future's result, or raise its exception.
+        """
+        self._check_closed()
+        self._check_running()
+
+        new_task = not futures.isfuture(future)
+        future = tasks.ensure_future(future, loop=self)
+        if new_task:
+            # An exception is raised if the future didn't complete, so there
+            # is no need to log the "destroy pending task" message
+            future._log_destroy_pending = False
+
+        future.add_done_callback(_run_until_complete_cb)
+        try:
+            self.run_forever()
+        except:
+            if new_task and future.done() and not future.cancelled():
+                # The coroutine raised a BaseException. Consume the exception
+                # to not log a warning, the caller doesn't have access to the
+                # local task.
+                future.exception()
+            raise
+        finally:
+            future.remove_done_callback(_run_until_complete_cb)
+        if not future.done():
+            raise RuntimeError('Event loop stopped before Future completed.')
+
+        return future.result()
+
+    def stop(self):
+        """Stop running the event loop.
+
+        Every callback already scheduled will still run.  This simply informs
+        run_forever to stop looping after a complete iteration.
+        """
+        self._stopping = True
+
+    def close(self):
+        """Close the event loop.
+
+        This clears the queues and shuts down the executor,
+        but does not wait for the executor to finish.
+
+        The event loop must not be running.
+        """
+        if self.is_running():
+            raise RuntimeError("Cannot close a running event loop")
+        if self._closed:
+            return
+        if self._debug:
+            logger.debug("Close %r", self)
+        self._closed = True
+        self._ready.clear()
+        self._scheduled.clear()
+        self._executor_shutdown_called = True
+        executor = self._default_executor
+        if executor is not None:
+            self._default_executor = None
+            executor.shutdown(wait=False)
+
+    def is_closed(self):
+        """Returns True if the event loop was closed."""
+        return self._closed
+
+    def __del__(self, _warn=warnings.warn):
+        if not self.is_closed():
+            _warn(f"unclosed event loop {self!r}", ResourceWarning, source=self)
+            if not self.is_running():
+                self.close()
+
+    def is_running(self):
+        """Returns True if the event loop is running."""
+        return (self._thread_id is not None)
+
+    def time(self):
+        """Return the time according to the event loop's clock.
+
+        This is a float expressed in seconds since an epoch, but the
+        epoch, precision, accuracy and drift are unspecified and may
+        differ per event loop.
+        """
+        return time.monotonic()
+
+    def call_later(self, delay, callback, *args, context=None):
+        """Arrange for a callback to be called at a given time.
+
+        Return a Handle: an opaque object with a cancel() method that
+        can be used to cancel the call.
+
+        The delay can be an int or float, expressed in seconds.  It is
+        always relative to the current time.
+
+        Each callback will be called exactly once.  If two callbacks
+        are scheduled for exactly the same time, it undefined which
+        will be called first.
+
+        Any positional arguments after the callback will be passed to
+        the callback when it is called.
+        """
+        timer = self.call_at(self.time() + delay, callback, *args,
+                             context=context)
+        if timer._source_traceback:
+            del timer._source_traceback[-1]
+        return timer
+
+    def call_at(self, when, callback, *args, context=None):
+        """Like call_later(), but uses an absolute time.
+
+        Absolute time corresponds to the event loop's time() method.
+        """
+        self._check_closed()
+        if self._debug:
+            self._check_thread()
+            self._check_callback(callback, 'call_at')
+        timer = events.TimerHandle(when, callback, args, self, context)
+        if timer._source_traceback:
+            del timer._source_traceback[-1]
+        heapq.heappush(self._scheduled, timer)
+        timer._scheduled = True
+        return timer
+
+    def call_soon(self, callback, *args, context=None):
+        """Arrange for a callback to be called as soon as possible.
+
+        This operates as a FIFO queue: callbacks are called in the
+        order in which they are registered.  Each callback will be
+        called exactly once.
+
+        Any positional arguments after the callback will be passed to
+        the callback when it is called.
+        """
+        self._check_closed()
+        if self._debug:
+            self._check_thread()
+            self._check_callback(callback, 'call_soon')
+        handle = self._call_soon(callback, args, context)
+        if handle._source_traceback:
+            del handle._source_traceback[-1]
+        return handle
+
+    def _check_callback(self, callback, method):
+        if (coroutines.iscoroutine(callback) or
+                coroutines.iscoroutinefunction(callback)):
+            raise TypeError(
+                f"coroutines cannot be used with {method}()")
+        if not callable(callback):
+            raise TypeError(
+                f'a callable object was expected by {method}(), '
+                f'got {callback!r}')
+
+    def _call_soon(self, callback, args, context):
+        handle = events.Handle(callback, args, self, context)
+        if handle._source_traceback:
+            del handle._source_traceback[-1]
+        self._ready.append(handle)
+        return handle
+
+    def _check_thread(self):
+        """Check that the current thread is the thread running the event loop.
+
+        Non-thread-safe methods of this class make this assumption and will
+        likely behave incorrectly when the assumption is violated.
+
+        Should only be called when (self._debug == True).  The caller is
+        responsible for checking this condition for performance reasons.
+        """
+        if self._thread_id is None:
+            return
+        thread_id = threading.get_ident()
+        if thread_id != self._thread_id:
+            raise RuntimeError(
+                "Non-thread-safe operation invoked on an event loop other "
+                "than the current one")
+
+    def call_soon_threadsafe(self, callback, *args, context=None):
+        """Like call_soon(), but thread-safe."""
+        self._check_closed()
+        if self._debug:
+            self._check_callback(callback, 'call_soon_threadsafe')
+        handle = self._call_soon(callback, args, context)
+        if handle._source_traceback:
+            del handle._source_traceback[-1]
+        self._write_to_self()
+        return handle
+
+    def run_in_executor(self, executor, func, *args):
+        self._check_closed()
+        if self._debug:
+            self._check_callback(func, 'run_in_executor')
+        if executor is None:
+            executor = self._default_executor
+            # Only check when the default executor is being used
+            self._check_default_executor()
+            if executor is None:
+                executor = concurrent.futures.ThreadPoolExecutor(
+                    thread_name_prefix='asyncio'
+                )
+                self._default_executor = executor
+        return futures.wrap_future(
+            executor.submit(func, *args), loop=self)
+
+    def set_default_executor(self, executor):
+        if not isinstance(executor, concurrent.futures.ThreadPoolExecutor):
+            warnings.warn(
+                'Using the default executor that is not an instance of '
+                'ThreadPoolExecutor is deprecated and will be prohibited '
+                'in Python 3.9',
+                DeprecationWarning, 2)
+        self._default_executor = executor
+
+    def _getaddrinfo_debug(self, host, port, family, type, proto, flags):
+        msg = [f"{host}:{port!r}"]
+        if family:
+            msg.append(f'family={family!r}')
+        if type:
+            msg.append(f'type={type!r}')
+        if proto:
+            msg.append(f'proto={proto!r}')
+        if flags:
+            msg.append(f'flags={flags!r}')
+        msg = ', '.join(msg)
+        logger.debug('Get address info %s', msg)
+
+        t0 = self.time()
+        addrinfo = socket.getaddrinfo(host, port, family, type, proto, flags)
+        dt = self.time() - t0
+
+        msg = f'Getting address info {msg} took {dt * 1e3:.3f}ms: {addrinfo!r}'
+        if dt >= self.slow_callback_duration:
+            logger.info(msg)
+        else:
+            logger.debug(msg)
+        return addrinfo
+
+    async def getaddrinfo(self, host, port, *,
+                          family=0, type=0, proto=0, flags=0):
+        if self._debug:
+            getaddr_func = self._getaddrinfo_debug
+        else:
+            getaddr_func = socket.getaddrinfo
+
+        return await self.run_in_executor(
+            None, getaddr_func, host, port, family, type, proto, flags)
+
+    async def getnameinfo(self, sockaddr, flags=0):
+        return await self.run_in_executor(
+            None, socket.getnameinfo, sockaddr, flags)
+
+    async def sock_sendfile(self, sock, file, offset=0, count=None,
+                            *, fallback=True):
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+        _check_ssl_socket(sock)
+        self._check_sendfile_params(sock, file, offset, count)
+        try:
+            return await self._sock_sendfile_native(sock, file,
+                                                    offset, count)
+        except exceptions.SendfileNotAvailableError as exc:
+            if not fallback:
+                raise
+        return await self._sock_sendfile_fallback(sock, file,
+                                                  offset, count)
+
+    async def _sock_sendfile_native(self, sock, file, offset, count):
+        # NB: sendfile syscall is not supported for SSL sockets and
+        # non-mmap files even if sendfile is supported by OS
+        raise exceptions.SendfileNotAvailableError(
+            f"syscall sendfile is not available for socket {sock!r} "
+            f"and file {file!r} combination")
+
+    async def _sock_sendfile_fallback(self, sock, file, offset, count):
+        if offset:
+            file.seek(offset)
+        blocksize = (
+            min(count, constants.SENDFILE_FALLBACK_READBUFFER_SIZE)
+            if count else constants.SENDFILE_FALLBACK_READBUFFER_SIZE
+        )
+        buf = bytearray(blocksize)
+        total_sent = 0
+        try:
+            while True:
+                if count:
+                    blocksize = min(count - total_sent, blocksize)
+                    if blocksize <= 0:
+                        break
+                view = memoryview(buf)[:blocksize]
+                read = await self.run_in_executor(None, file.readinto, view)
+                if not read:
+                    break  # EOF
+                await self.sock_sendall(sock, view[:read])
+                total_sent += read
+            return total_sent
+        finally:
+            if total_sent > 0 and hasattr(file, 'seek'):
+                file.seek(offset + total_sent)
+
+    def _check_sendfile_params(self, sock, file, offset, count):
+        if 'b' not in getattr(file, 'mode', 'b'):
+            raise ValueError("file should be opened in binary mode")
+        if not sock.type == socket.SOCK_STREAM:
+            raise ValueError("only SOCK_STREAM type sockets are supported")
+        if count is not None:
+            if not isinstance(count, int):
+                raise TypeError(
+                    "count must be a positive integer (got {!r})".format(count))
+            if count <= 0:
+                raise ValueError(
+                    "count must be a positive integer (got {!r})".format(count))
+        if not isinstance(offset, int):
+            raise TypeError(
+                "offset must be a non-negative integer (got {!r})".format(
+                    offset))
+        if offset < 0:
+            raise ValueError(
+                "offset must be a non-negative integer (got {!r})".format(
+                    offset))
+
+    async def _connect_sock(self, exceptions, addr_info, local_addr_infos=None):
+        """Create, bind and connect one socket."""
+        my_exceptions = []
+        exceptions.append(my_exceptions)
+        family, type_, proto, _, address = addr_info
+        sock = None
+        try:
+            sock = socket.socket(family=family, type=type_, proto=proto)
+            sock.setblocking(False)
+            if local_addr_infos is not None:
+                for lfamily, _, _, _, laddr in local_addr_infos:
+                    # skip local addresses of different family
+                    if lfamily != family:
+                        continue
+                    try:
+                        sock.bind(laddr)
+                        break
+                    except OSError as exc:
+                        msg = (
+                            f'error while attempting to bind on '
+                            f'address {laddr!r}: '
+                            f'{exc.strerror.lower()}'
+                        )
+                        exc = OSError(exc.errno, msg)
+                        my_exceptions.append(exc)
+                else:  # all bind attempts failed
+                    if my_exceptions:
+                        raise my_exceptions.pop()
+                    else:
+                        raise OSError(f"no matching local address with {family=} found")
+            await self.sock_connect(sock, address)
+            return sock
+        except OSError as exc:
+            my_exceptions.append(exc)
+            if sock is not None:
+                sock.close()
+            raise
+        except:
+            if sock is not None:
+                sock.close()
+            raise
+        finally:
+            exceptions = my_exceptions = None
+
+    async def create_connection(
+            self, protocol_factory, host=None, port=None,
+            *, ssl=None, family=0,
+            proto=0, flags=0, sock=None,
+            local_addr=None, server_hostname=None,
+            ssl_handshake_timeout=None,
+            happy_eyeballs_delay=None, interleave=None):
+        """Connect to a TCP server.
+
+        Create a streaming transport connection to a given internet host and
+        port: socket family AF_INET or socket.AF_INET6 depending on host (or
+        family if specified), socket type SOCK_STREAM. protocol_factory must be
+        a callable returning a protocol instance.
+
+        This method is a coroutine which will try to establish the connection
+        in the background.  When successful, the coroutine returns a
+        (transport, protocol) pair.
+        """
+        if server_hostname is not None and not ssl:
+            raise ValueError('server_hostname is only meaningful with ssl')
+
+        if server_hostname is None and ssl:
+            # Use host as default for server_hostname.  It is an error
+            # if host is empty or not set, e.g. when an
+            # already-connected socket was passed or when only a port
+            # is given.  To avoid this error, you can pass
+            # server_hostname='' -- this will bypass the hostname
+            # check.  (This also means that if host is a numeric
+            # IP/IPv6 address, we will attempt to verify that exact
+            # address; this will probably fail, but it is possible to
+            # create a certificate for a specific IP address, so we
+            # don't judge it here.)
+            if not host:
+                raise ValueError('You must set server_hostname '
+                                 'when using ssl without a host')
+            server_hostname = host
+
+        if ssl_handshake_timeout is not None and not ssl:
+            raise ValueError(
+                'ssl_handshake_timeout is only meaningful with ssl')
+
+        if sock is not None:
+            _check_ssl_socket(sock)
+
+        if happy_eyeballs_delay is not None and interleave is None:
+            # If using happy eyeballs, default to interleave addresses by family
+            interleave = 1
+
+        if host is not None or port is not None:
+            if sock is not None:
+                raise ValueError(
+                    'host/port and sock can not be specified at the same time')
+
+            infos = await self._ensure_resolved(
+                (host, port), family=family,
+                type=socket.SOCK_STREAM, proto=proto, flags=flags, loop=self)
+            if not infos:
+                raise OSError('getaddrinfo() returned empty list')
+
+            if local_addr is not None:
+                laddr_infos = await self._ensure_resolved(
+                    local_addr, family=family,
+                    type=socket.SOCK_STREAM, proto=proto,
+                    flags=flags, loop=self)
+                if not laddr_infos:
+                    raise OSError('getaddrinfo() returned empty list')
+            else:
+                laddr_infos = None
+
+            if interleave:
+                infos = _interleave_addrinfos(infos, interleave)
+
+            exceptions = []
+            if happy_eyeballs_delay is None:
+                # not using happy eyeballs
+                for addrinfo in infos:
+                    try:
+                        sock = await self._connect_sock(
+                            exceptions, addrinfo, laddr_infos)
+                        break
+                    except OSError:
+                        continue
+            else:  # using happy eyeballs
+                sock, _, _ = await staggered.staggered_race(
+                    (functools.partial(self._connect_sock,
+                                       exceptions, addrinfo, laddr_infos)
+                     for addrinfo in infos),
+                    happy_eyeballs_delay, loop=self)
+
+            if sock is None:
+                exceptions = [exc for sub in exceptions for exc in sub]
+                try:
+                    if len(exceptions) == 1:
+                        raise exceptions[0]
+                    else:
+                        # If they all have the same str(), raise one.
+                        model = str(exceptions[0])
+                        if all(str(exc) == model for exc in exceptions):
+                            raise exceptions[0]
+                        # Raise a combined exception so the user can see all
+                        # the various error messages.
+                        raise OSError('Multiple exceptions: {}'.format(
+                            ', '.join(str(exc) for exc in exceptions)))
+                finally:
+                    exceptions = None
+
+        else:
+            if sock is None:
+                raise ValueError(
+                    'host and port was not specified and no sock specified')
+            if sock.type != socket.SOCK_STREAM:
+                # We allow AF_INET, AF_INET6, AF_UNIX as long as they
+                # are SOCK_STREAM.
+                # We support passing AF_UNIX sockets even though we have
+                # a dedicated API for that: create_unix_connection.
+                # Disallowing AF_UNIX in this method, breaks backwards
+                # compatibility.
+                raise ValueError(
+                    f'A Stream Socket was expected, got {sock!r}')
+
+        transport, protocol = await self._create_connection_transport(
+            sock, protocol_factory, ssl, server_hostname,
+            ssl_handshake_timeout=ssl_handshake_timeout)
+        if self._debug:
+            # Get the socket from the transport because SSL transport closes
+            # the old socket and creates a new SSL socket
+            sock = transport.get_extra_info('socket')
+            logger.debug("%r connected to %s:%r: (%r, %r)",
+                         sock, host, port, transport, protocol)
+        return transport, protocol
+
+    async def _create_connection_transport(
+            self, sock, protocol_factory, ssl,
+            server_hostname, server_side=False,
+            ssl_handshake_timeout=None):
+
+        sock.setblocking(False)
+
+        protocol = protocol_factory()
+        waiter = self.create_future()
+        if ssl:
+            sslcontext = None if isinstance(ssl, bool) else ssl
+            transport = self._make_ssl_transport(
+                sock, protocol, sslcontext, waiter,
+                server_side=server_side, server_hostname=server_hostname,
+                ssl_handshake_timeout=ssl_handshake_timeout)
+        else:
+            transport = self._make_socket_transport(sock, protocol, waiter)
+
+        try:
+            await waiter
+        except:
+            transport.close()
+            raise
+
+        return transport, protocol
+
+    async def sendfile(self, transport, file, offset=0, count=None,
+                       *, fallback=True):
+        """Send a file to transport.
+
+        Return the total number of bytes which were sent.
+
+        The method uses high-performance os.sendfile if available.
+
+        file must be a regular file object opened in binary mode.
+
+        offset tells from where to start reading the file. If specified,
+        count is the total number of bytes to transmit as opposed to
+        sending the file until EOF is reached. File position is updated on
+        return or also in case of error in which case file.tell()
+        can be used to figure out the number of bytes
+        which were sent.
+
+        fallback set to True makes asyncio to manually read and send
+        the file when the platform does not support the sendfile syscall
+        (e.g. Windows or SSL socket on Unix).
+
+        Raise SendfileNotAvailableError if the system does not support
+        sendfile syscall and fallback is False.
+        """
+        if transport.is_closing():
+            raise RuntimeError("Transport is closing")
+        mode = getattr(transport, '_sendfile_compatible',
+                       constants._SendfileMode.UNSUPPORTED)
+        if mode is constants._SendfileMode.UNSUPPORTED:
+            raise RuntimeError(
+                f"sendfile is not supported for transport {transport!r}")
+        if mode is constants._SendfileMode.TRY_NATIVE:
+            try:
+                return await self._sendfile_native(transport, file,
+                                                   offset, count)
+            except exceptions.SendfileNotAvailableError as exc:
+                if not fallback:
+                    raise
+
+        if not fallback:
+            raise RuntimeError(
+                f"fallback is disabled and native sendfile is not "
+                f"supported for transport {transport!r}")
+
+        return await self._sendfile_fallback(transport, file,
+                                             offset, count)
+
+    async def _sendfile_native(self, transp, file, offset, count):
+        raise exceptions.SendfileNotAvailableError(
+            "sendfile syscall is not supported")
+
+    async def _sendfile_fallback(self, transp, file, offset, count):
+        if offset:
+            file.seek(offset)
+        blocksize = min(count, 16384) if count else 16384
+        buf = bytearray(blocksize)
+        total_sent = 0
+        proto = _SendfileFallbackProtocol(transp)
+        try:
+            while True:
+                if count:
+                    blocksize = min(count - total_sent, blocksize)
+                    if blocksize <= 0:
+                        return total_sent
+                view = memoryview(buf)[:blocksize]
+                read = await self.run_in_executor(None, file.readinto, view)
+                if not read:
+                    return total_sent  # EOF
+                await proto.drain()
+                transp.write(view[:read])
+                total_sent += read
+        finally:
+            if total_sent > 0 and hasattr(file, 'seek'):
+                file.seek(offset + total_sent)
+            await proto.restore()
+
+    async def start_tls(self, transport, protocol, sslcontext, *,
+                        server_side=False,
+                        server_hostname=None,
+                        ssl_handshake_timeout=None):
+        """Upgrade transport to TLS.
+
+        Return a new transport that *protocol* should start using
+        immediately.
+        """
+        if ssl is None:
+            raise RuntimeError('Python ssl module is not available')
+
+        if not isinstance(sslcontext, ssl.SSLContext):
+            raise TypeError(
+                f'sslcontext is expected to be an instance of ssl.SSLContext, '
+                f'got {sslcontext!r}')
+
+        if not getattr(transport, '_start_tls_compatible', False):
+            raise TypeError(
+                f'transport {transport!r} is not supported by start_tls()')
+
+        waiter = self.create_future()
+        ssl_protocol = sslproto.SSLProtocol(
+            self, protocol, sslcontext, waiter,
+            server_side, server_hostname,
+            ssl_handshake_timeout=ssl_handshake_timeout,
+            call_connection_made=False)
+
+        # Pause early so that "ssl_protocol.data_received()" doesn't
+        # have a chance to get called before "ssl_protocol.connection_made()".
+        transport.pause_reading()
+
+        transport.set_protocol(ssl_protocol)
+        conmade_cb = self.call_soon(ssl_protocol.connection_made, transport)
+        resume_cb = self.call_soon(transport.resume_reading)
+
+        try:
+            await waiter
+        except BaseException:
+            transport.close()
+            conmade_cb.cancel()
+            resume_cb.cancel()
+            raise
+
+        return ssl_protocol._app_transport
+
+    async def create_datagram_endpoint(self, protocol_factory,
+                                       local_addr=None, remote_addr=None, *,
+                                       family=0, proto=0, flags=0,
+                                       reuse_address=_unset, reuse_port=None,
+                                       allow_broadcast=None, sock=None):
+        """Create datagram connection."""
+        if sock is not None:
+            if sock.type != socket.SOCK_DGRAM:
+                raise ValueError(
+                    f'A UDP Socket was expected, got {sock!r}')
+            if (local_addr or remote_addr or
+                    family or proto or flags or
+                    reuse_port or allow_broadcast):
+                # show the problematic kwargs in exception msg
+                opts = dict(local_addr=local_addr, remote_addr=remote_addr,
+                            family=family, proto=proto, flags=flags,
+                            reuse_address=reuse_address, reuse_port=reuse_port,
+                            allow_broadcast=allow_broadcast)
+                problems = ', '.join(f'{k}={v}' for k, v in opts.items() if v)
+                raise ValueError(
+                    f'socket modifier keyword arguments can not be used '
+                    f'when sock is specified. ({problems})')
+            sock.setblocking(False)
+            r_addr = None
+        else:
+            if not (local_addr or remote_addr):
+                if family == 0:
+                    raise ValueError('unexpected address family')
+                addr_pairs_info = (((family, proto), (None, None)),)
+            elif hasattr(socket, 'AF_UNIX') and family == socket.AF_UNIX:
+                for addr in (local_addr, remote_addr):
+                    if addr is not None and not isinstance(addr, str):
+                        raise TypeError('string is expected')
+
+                if local_addr and local_addr[0] not in (0, '\x00'):
+                    try:
+                        if stat.S_ISSOCK(os.stat(local_addr).st_mode):
+                            os.remove(local_addr)
+                    except FileNotFoundError:
+                        pass
+                    except OSError as err:
+                        # Directory may have permissions only to create socket.
+                        logger.error('Unable to check or remove stale UNIX '
+                                     'socket %r: %r',
+                                     local_addr, err)
+
+                addr_pairs_info = (((family, proto),
+                                    (local_addr, remote_addr)), )
+            else:
+                # join address by (family, protocol)
+                addr_infos = {}  # Using order preserving dict
+                for idx, addr in ((0, local_addr), (1, remote_addr)):
+                    if addr is not None:
+                        assert isinstance(addr, tuple) and len(addr) == 2, (
+                            '2-tuple is expected')
+
+                        infos = await self._ensure_resolved(
+                            addr, family=family, type=socket.SOCK_DGRAM,
+                            proto=proto, flags=flags, loop=self)
+                        if not infos:
+                            raise OSError('getaddrinfo() returned empty list')
+
+                        for fam, _, pro, _, address in infos:
+                            key = (fam, pro)
+                            if key not in addr_infos:
+                                addr_infos[key] = [None, None]
+                            addr_infos[key][idx] = address
+
+                # each addr has to have info for each (family, proto) pair
+                addr_pairs_info = [
+                    (key, addr_pair) for key, addr_pair in addr_infos.items()
+                    if not ((local_addr and addr_pair[0] is None) or
+                            (remote_addr and addr_pair[1] is None))]
+
+                if not addr_pairs_info:
+                    raise ValueError('can not get address information')
+
+            exceptions = []
+
+            # bpo-37228
+            if reuse_address is not _unset:
+                if reuse_address:
+                    raise ValueError("Passing `reuse_address=True` is no "
+                                     "longer supported, as the usage of "
+                                     "SO_REUSEPORT in UDP poses a significant "
+                                     "security concern.")
+                else:
+                    warnings.warn("The *reuse_address* parameter has been "
+                                  "deprecated as of 3.5.10 and is scheduled "
+                                  "for removal in 3.11.", DeprecationWarning,
+                                  stacklevel=2)
+
+            for ((family, proto),
+                 (local_address, remote_address)) in addr_pairs_info:
+                sock = None
+                r_addr = None
+                try:
+                    sock = socket.socket(
+                        family=family, type=socket.SOCK_DGRAM, proto=proto)
+                    if reuse_port:
+                        _set_reuseport(sock)
+                    if allow_broadcast:
+                        sock.setsockopt(
+                            socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
+                    sock.setblocking(False)
+
+                    if local_addr:
+                        sock.bind(local_address)
+                    if remote_addr:
+                        if not allow_broadcast:
+                            await self.sock_connect(sock, remote_address)
+                        r_addr = remote_address
+                except OSError as exc:
+                    if sock is not None:
+                        sock.close()
+                    exceptions.append(exc)
+                except:
+                    if sock is not None:
+                        sock.close()
+                    raise
+                else:
+                    break
+            else:
+                raise exceptions[0]
+
+        protocol = protocol_factory()
+        waiter = self.create_future()
+        transport = self._make_datagram_transport(
+            sock, protocol, r_addr, waiter)
+        if self._debug:
+            if local_addr:
+                logger.info("Datagram endpoint local_addr=%r remote_addr=%r "
+                            "created: (%r, %r)",
+                            local_addr, remote_addr, transport, protocol)
+            else:
+                logger.debug("Datagram endpoint remote_addr=%r created: "
+                             "(%r, %r)",
+                             remote_addr, transport, protocol)
+
+        try:
+            await waiter
+        except:
+            transport.close()
+            raise
+
+        return transport, protocol
+
+    async def _ensure_resolved(self, address, *,
+                               family=0, type=socket.SOCK_STREAM,
+                               proto=0, flags=0, loop):
+        host, port = address[:2]
+        info = _ipaddr_info(host, port, family, type, proto, *address[2:])
+        if info is not None:
+            # "host" is already a resolved IP.
+            return [info]
+        else:
+            return await loop.getaddrinfo(host, port, family=family, type=type,
+                                          proto=proto, flags=flags)
+
+    async def _create_server_getaddrinfo(self, host, port, family, flags):
+        infos = await self._ensure_resolved((host, port), family=family,
+                                            type=socket.SOCK_STREAM,
+                                            flags=flags, loop=self)
+        if not infos:
+            raise OSError(f'getaddrinfo({host!r}) returned empty list')
+        return infos
+
+    async def create_server(
+            self, protocol_factory, host=None, port=None,
+            *,
+            family=socket.AF_UNSPEC,
+            flags=socket.AI_PASSIVE,
+            sock=None,
+            backlog=100,
+            ssl=None,
+            reuse_address=None,
+            reuse_port=None,
+            ssl_handshake_timeout=None,
+            start_serving=True):
+        """Create a TCP server.
+
+        The host parameter can be a string, in that case the TCP server is
+        bound to host and port.
+
+        The host parameter can also be a sequence of strings and in that case
+        the TCP server is bound to all hosts of the sequence. If a host
+        appears multiple times (possibly indirectly e.g. when hostnames
+        resolve to the same IP address), the server is only bound once to that
+        host.
+
+        Return a Server object which can be used to stop the service.
+
+        This method is a coroutine.
+        """
+        if isinstance(ssl, bool):
+            raise TypeError('ssl argument must be an SSLContext or None')
+
+        if ssl_handshake_timeout is not None and ssl is None:
+            raise ValueError(
+                'ssl_handshake_timeout is only meaningful with ssl')
+
+        if sock is not None:
+            _check_ssl_socket(sock)
+
+        if host is not None or port is not None:
+            if sock is not None:
+                raise ValueError(
+                    'host/port and sock can not be specified at the same time')
+
+            if reuse_address is None:
+                reuse_address = os.name == 'posix' and sys.platform != 'cygwin'
+            sockets = []
+            if host == '':
+                hosts = [None]
+            elif (isinstance(host, str) or
+                  not isinstance(host, collections.abc.Iterable)):
+                hosts = [host]
+            else:
+                hosts = host
+
+            fs = [self._create_server_getaddrinfo(host, port, family=family,
+                                                  flags=flags)
+                  for host in hosts]
+            infos = await tasks.gather(*fs)
+            infos = set(itertools.chain.from_iterable(infos))
+
+            completed = False
+            try:
+                for res in infos:
+                    af, socktype, proto, canonname, sa = res
+                    try:
+                        sock = socket.socket(af, socktype, proto)
+                    except socket.error:
+                        # Assume it's a bad family/type/protocol combination.
+                        if self._debug:
+                            logger.warning('create_server() failed to create '
+                                           'socket.socket(%r, %r, %r)',
+                                           af, socktype, proto, exc_info=True)
+                        continue
+                    sockets.append(sock)
+                    if reuse_address:
+                        sock.setsockopt(
+                            socket.SOL_SOCKET, socket.SO_REUSEADDR, True)
+                    if reuse_port:
+                        _set_reuseport(sock)
+                    # Disable IPv4/IPv6 dual stack support (enabled by
+                    # default on Linux) which makes a single socket
+                    # listen on both address families.
+                    if (_HAS_IPv6 and
+                            af == socket.AF_INET6 and
+                            hasattr(socket, 'IPPROTO_IPV6')):
+                        sock.setsockopt(socket.IPPROTO_IPV6,
+                                        socket.IPV6_V6ONLY,
+                                        True)
+                    try:
+                        sock.bind(sa)
+                    except OSError as err:
+                        raise OSError(err.errno, 'error while attempting '
+                                      'to bind on address %r: %s'
+                                      % (sa, err.strerror.lower())) from None
+                completed = True
+            finally:
+                if not completed:
+                    for sock in sockets:
+                        sock.close()
+        else:
+            if sock is None:
+                raise ValueError('Neither host/port nor sock were specified')
+            if sock.type != socket.SOCK_STREAM:
+                raise ValueError(f'A Stream Socket was expected, got {sock!r}')
+            sockets = [sock]
+
+        for sock in sockets:
+            sock.setblocking(False)
+
+        server = Server(self, sockets, protocol_factory,
+                        ssl, backlog, ssl_handshake_timeout)
+        if start_serving:
+            server._start_serving()
+            # Skip one loop iteration so that all 'loop.add_reader'
+            # go through.
+            await tasks.sleep(0)
+
+        if self._debug:
+            logger.info("%r is serving", server)
+        return server
+
+    async def connect_accepted_socket(
+            self, protocol_factory, sock,
+            *, ssl=None,
+            ssl_handshake_timeout=None):
+        if sock.type != socket.SOCK_STREAM:
+            raise ValueError(f'A Stream Socket was expected, got {sock!r}')
+
+        if ssl_handshake_timeout is not None and not ssl:
+            raise ValueError(
+                'ssl_handshake_timeout is only meaningful with ssl')
+
+        if sock is not None:
+            _check_ssl_socket(sock)
+
+        transport, protocol = await self._create_connection_transport(
+            sock, protocol_factory, ssl, '', server_side=True,
+            ssl_handshake_timeout=ssl_handshake_timeout)
+        if self._debug:
+            # Get the socket from the transport because SSL transport closes
+            # the old socket and creates a new SSL socket
+            sock = transport.get_extra_info('socket')
+            logger.debug("%r handled: (%r, %r)", sock, transport, protocol)
+        return transport, protocol
+
+    async def connect_read_pipe(self, protocol_factory, pipe):
+        protocol = protocol_factory()
+        waiter = self.create_future()
+        transport = self._make_read_pipe_transport(pipe, protocol, waiter)
+
+        try:
+            await waiter
+        except:
+            transport.close()
+            raise
+
+        if self._debug:
+            logger.debug('Read pipe %r connected: (%r, %r)',
+                         pipe.fileno(), transport, protocol)
+        return transport, protocol
+
+    async def connect_write_pipe(self, protocol_factory, pipe):
+        protocol = protocol_factory()
+        waiter = self.create_future()
+        transport = self._make_write_pipe_transport(pipe, protocol, waiter)
+
+        try:
+            await waiter
+        except:
+            transport.close()
+            raise
+
+        if self._debug:
+            logger.debug('Write pipe %r connected: (%r, %r)',
+                         pipe.fileno(), transport, protocol)
+        return transport, protocol
+
+    def _log_subprocess(self, msg, stdin, stdout, stderr):
+        info = [msg]
+        if stdin is not None:
+            info.append(f'stdin={_format_pipe(stdin)}')
+        if stdout is not None and stderr == subprocess.STDOUT:
+            info.append(f'stdout=stderr={_format_pipe(stdout)}')
+        else:
+            if stdout is not None:
+                info.append(f'stdout={_format_pipe(stdout)}')
+            if stderr is not None:
+                info.append(f'stderr={_format_pipe(stderr)}')
+        logger.debug(' '.join(info))
+
+    async def subprocess_shell(self, protocol_factory, cmd, *,
+                               stdin=subprocess.PIPE,
+                               stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE,
+                               universal_newlines=False,
+                               shell=True, bufsize=0,
+                               encoding=None, errors=None, text=None,
+                               **kwargs):
+        if not isinstance(cmd, (bytes, str)):
+            raise ValueError("cmd must be a string")
+        if universal_newlines:
+            raise ValueError("universal_newlines must be False")
+        if not shell:
+            raise ValueError("shell must be True")
+        if bufsize != 0:
+            raise ValueError("bufsize must be 0")
+        if text:
+            raise ValueError("text must be False")
+        if encoding is not None:
+            raise ValueError("encoding must be None")
+        if errors is not None:
+            raise ValueError("errors must be None")
+
+        protocol = protocol_factory()
+        debug_log = None
+        if self._debug:
+            # don't log parameters: they may contain sensitive information
+            # (password) and may be too long
+            debug_log = 'run shell command %r' % cmd
+            self._log_subprocess(debug_log, stdin, stdout, stderr)
+        transport = await self._make_subprocess_transport(
+            protocol, cmd, True, stdin, stdout, stderr, bufsize, **kwargs)
+        if self._debug and debug_log is not None:
+            logger.info('%s: %r', debug_log, transport)
+        return transport, protocol
+
+    async def subprocess_exec(self, protocol_factory, program, *args,
+                              stdin=subprocess.PIPE, stdout=subprocess.PIPE,
+                              stderr=subprocess.PIPE, universal_newlines=False,
+                              shell=False, bufsize=0,
+                              encoding=None, errors=None, text=None,
+                              **kwargs):
+        if universal_newlines:
+            raise ValueError("universal_newlines must be False")
+        if shell:
+            raise ValueError("shell must be False")
+        if bufsize != 0:
+            raise ValueError("bufsize must be 0")
+        if text:
+            raise ValueError("text must be False")
+        if encoding is not None:
+            raise ValueError("encoding must be None")
+        if errors is not None:
+            raise ValueError("errors must be None")
+
+        popen_args = (program,) + args
+        protocol = protocol_factory()
+        debug_log = None
+        if self._debug:
+            # don't log parameters: they may contain sensitive information
+            # (password) and may be too long
+            debug_log = f'execute program {program!r}'
+            self._log_subprocess(debug_log, stdin, stdout, stderr)
+        transport = await self._make_subprocess_transport(
+            protocol, popen_args, False, stdin, stdout, stderr,
+            bufsize, **kwargs)
+        if self._debug and debug_log is not None:
+            logger.info('%s: %r', debug_log, transport)
+        return transport, protocol
+
+    def get_exception_handler(self):
+        """Return an exception handler, or None if the default one is in use.
+        """
+        return self._exception_handler
+
+    def set_exception_handler(self, handler):
+        """Set handler as the new event loop exception handler.
+
+        If handler is None, the default exception handler will
+        be set.
+
+        If handler is a callable object, it should have a
+        signature matching '(loop, context)', where 'loop'
+        will be a reference to the active event loop, 'context'
+        will be a dict object (see `call_exception_handler()`
+        documentation for details about context).
+        """
+        if handler is not None and not callable(handler):
+            raise TypeError(f'A callable object or None is expected, '
+                            f'got {handler!r}')
+        self._exception_handler = handler
+
+    def default_exception_handler(self, context):
+        """Default exception handler.
+
+        This is called when an exception occurs and no exception
+        handler is set, and can be called by a custom exception
+        handler that wants to defer to the default behavior.
+
+        This default handler logs the error message and other
+        context-dependent information.  In debug mode, a truncated
+        stack trace is also appended showing where the given object
+        (e.g. a handle or future or task) was created, if any.
+
+        The context parameter has the same meaning as in
+        `call_exception_handler()`.
+        """
+        message = context.get('message')
+        if not message:
+            message = 'Unhandled exception in event loop'
+
+        exception = context.get('exception')
+        if exception is not None:
+            exc_info = (type(exception), exception, exception.__traceback__)
+        else:
+            exc_info = False
+
+        if ('source_traceback' not in context and
+                self._current_handle is not None and
+                self._current_handle._source_traceback):
+            context['handle_traceback'] = \
+                self._current_handle._source_traceback
+
+        log_lines = [message]
+        for key in sorted(context):
+            if key in {'message', 'exception'}:
+                continue
+            value = context[key]
+            if key == 'source_traceback':
+                tb = ''.join(traceback.format_list(value))
+                value = 'Object created at (most recent call last):\n'
+                value += tb.rstrip()
+            elif key == 'handle_traceback':
+                tb = ''.join(traceback.format_list(value))
+                value = 'Handle created at (most recent call last):\n'
+                value += tb.rstrip()
+            else:
+                value = repr(value)
+            log_lines.append(f'{key}: {value}')
+
+        logger.error('\n'.join(log_lines), exc_info=exc_info)
+
+    def call_exception_handler(self, context):
+        """Call the current event loop's exception handler.
+
+        The context argument is a dict containing the following keys:
+
+        - 'message': Error message;
+        - 'exception' (optional): Exception object;
+        - 'future' (optional): Future instance;
+        - 'task' (optional): Task instance;
+        - 'handle' (optional): Handle instance;
+        - 'protocol' (optional): Protocol instance;
+        - 'transport' (optional): Transport instance;
+        - 'socket' (optional): Socket instance;
+        - 'asyncgen' (optional): Asynchronous generator that caused
+                                 the exception.
+
+        New keys maybe introduced in the future.
+
+        Note: do not overload this method in an event loop subclass.
+        For custom exception handling, use the
+        `set_exception_handler()` method.
+        """
+        if self._exception_handler is None:
+            try:
+                self.default_exception_handler(context)
+            except (SystemExit, KeyboardInterrupt):
+                raise
+            except BaseException:
+                # Second protection layer for unexpected errors
+                # in the default implementation, as well as for subclassed
+                # event loops with overloaded "default_exception_handler".
+                logger.error('Exception in default exception handler',
+                             exc_info=True)
+        else:
+            try:
+                self._exception_handler(self, context)
+            except (SystemExit, KeyboardInterrupt):
+                raise
+            except BaseException as exc:
+                # Exception in the user set custom exception handler.
+                try:
+                    # Let's try default handler.
+                    self.default_exception_handler({
+                        'message': 'Unhandled error in exception handler',
+                        'exception': exc,
+                        'context': context,
+                    })
+                except (SystemExit, KeyboardInterrupt):
+                    raise
+                except BaseException:
+                    # Guard 'default_exception_handler' in case it is
+                    # overloaded.
+                    logger.error('Exception in default exception handler '
+                                 'while handling an unexpected error '
+                                 'in custom exception handler',
+                                 exc_info=True)
+
+    def _add_callback(self, handle):
+        """Add a Handle to _ready."""
+        if not handle._cancelled:
+            self._ready.append(handle)
+
+    def _add_callback_signalsafe(self, handle):
+        """Like _add_callback() but called from a signal handler."""
+        self._add_callback(handle)
+        self._write_to_self()
+
+    def _timer_handle_cancelled(self, handle):
+        """Notification that a TimerHandle has been cancelled."""
+        if handle._scheduled:
+            self._timer_cancelled_count += 1
+
+    def _run_once(self):
+        """Run one full iteration of the event loop.
+
+        This calls all currently ready callbacks, polls for I/O,
+        schedules the resulting callbacks, and finally schedules
+        'call_later' callbacks.
+        """
+
+        sched_count = len(self._scheduled)
+        if (sched_count > _MIN_SCHEDULED_TIMER_HANDLES and
+            self._timer_cancelled_count / sched_count >
+                _MIN_CANCELLED_TIMER_HANDLES_FRACTION):
+            # Remove delayed calls that were cancelled if their number
+            # is too high
+            new_scheduled = []
+            for handle in self._scheduled:
+                if handle._cancelled:
+                    handle._scheduled = False
+                else:
+                    new_scheduled.append(handle)
+
+            heapq.heapify(new_scheduled)
+            self._scheduled = new_scheduled
+            self._timer_cancelled_count = 0
+        else:
+            # Remove delayed calls that were cancelled from head of queue.
+            while self._scheduled and self._scheduled[0]._cancelled:
+                self._timer_cancelled_count -= 1
+                handle = heapq.heappop(self._scheduled)
+                handle._scheduled = False
+
+        timeout = None
+        if self._ready or self._stopping:
+            timeout = 0
+        elif self._scheduled:
+            # Compute the desired timeout.
+            when = self._scheduled[0]._when
+            timeout = min(max(0, when - self.time()), MAXIMUM_SELECT_TIMEOUT)
+
+        event_list = self._selector.select(timeout)
+        self._process_events(event_list)
+        # Needed to break cycles when an exception occurs.
+        event_list = None
+
+        # Handle 'later' callbacks that are ready.
+        end_time = self.time() + self._clock_resolution
+        while self._scheduled:
+            handle = self._scheduled[0]
+            if handle._when >= end_time:
+                break
+            handle = heapq.heappop(self._scheduled)
+            handle._scheduled = False
+            self._ready.append(handle)
+
+        # This is the only place where callbacks are actually *called*.
+        # All other places just add them to ready.
+        # Note: We run all currently scheduled callbacks, but not any
+        # callbacks scheduled by callbacks run this time around --
+        # they will be run the next time (after another I/O poll).
+        # Use an idiom that is thread-safe without using locks.
+        ntodo = len(self._ready)
+        for i in range(ntodo):
+            handle = self._ready.popleft()
+            if handle._cancelled:
+                continue
+            if self._debug:
+                try:
+                    self._current_handle = handle
+                    t0 = self.time()
+                    handle._run()
+                    dt = self.time() - t0
+                    if dt >= self.slow_callback_duration:
+                        logger.warning('Executing %s took %.3f seconds',
+                                       _format_handle(handle), dt)
+                finally:
+                    self._current_handle = None
+            else:
+                handle._run()
+        handle = None  # Needed to break cycles when an exception occurs.
+
+    def _set_coroutine_origin_tracking(self, enabled):
+        if bool(enabled) == bool(self._coroutine_origin_tracking_enabled):
+            return
+
+        if enabled:
+            self._coroutine_origin_tracking_saved_depth = (
+                sys.get_coroutine_origin_tracking_depth())
+            sys.set_coroutine_origin_tracking_depth(
+                constants.DEBUG_STACK_DEPTH)
+        else:
+            sys.set_coroutine_origin_tracking_depth(
+                self._coroutine_origin_tracking_saved_depth)
+
+        self._coroutine_origin_tracking_enabled = enabled
+
+    def get_debug(self):
+        return self._debug
+
+    def set_debug(self, enabled):
+        self._debug = enabled
+
+        if self.is_running():
+            self.call_soon_threadsafe(self._set_coroutine_origin_tracking, enabled)

janus/lib/python3.10/asyncio/base_tasks.py

@@ -0,0 +1,85 @@
+import linecache
+import traceback
+
+from . import base_futures
+from . import coroutines
+
+
+def _task_repr_info(task):
+    info = base_futures._future_repr_info(task)
+
+    if task._must_cancel:
+        # replace status
+        info[0] = 'cancelling'
+
+    info.insert(1, 'name=%r' % task.get_name())
+
+    coro = coroutines._format_coroutine(task._coro)
+    info.insert(2, f'coro=<{coro}>')
+
+    if task._fut_waiter is not None:
+        info.insert(3, f'wait_for={task._fut_waiter!r}')
+    return info
+
+
+def _task_get_stack(task, limit):
+    frames = []
+    if hasattr(task._coro, 'cr_frame'):
+        # case 1: 'async def' coroutines
+        f = task._coro.cr_frame
+    elif hasattr(task._coro, 'gi_frame'):
+        # case 2: legacy coroutines
+        f = task._coro.gi_frame
+    elif hasattr(task._coro, 'ag_frame'):
+        # case 3: async generators
+        f = task._coro.ag_frame
+    else:
+        # case 4: unknown objects
+        f = None
+    if f is not None:
+        while f is not None:
+            if limit is not None:
+                if limit <= 0:
+                    break
+                limit -= 1
+            frames.append(f)
+            f = f.f_back
+        frames.reverse()
+    elif task._exception is not None:
+        tb = task._exception.__traceback__
+        while tb is not None:
+            if limit is not None:
+                if limit <= 0:
+                    break
+                limit -= 1
+            frames.append(tb.tb_frame)
+            tb = tb.tb_next
+    return frames
+
+
+def _task_print_stack(task, limit, file):
+    extracted_list = []
+    checked = set()
+    for f in task.get_stack(limit=limit):
+        lineno = f.f_lineno
+        co = f.f_code
+        filename = co.co_filename
+        name = co.co_name
+        if filename not in checked:
+            checked.add(filename)
+            linecache.checkcache(filename)
+        line = linecache.getline(filename, lineno, f.f_globals)
+        extracted_list.append((filename, lineno, name, line))
+
+    exc = task._exception
+    if not extracted_list:
+        print(f'No stack for {task!r}', file=file)
+    elif exc is not None:
+        print(f'Traceback for {task!r} (most recent call last):', file=file)
+    else:
+        print(f'Stack for {task!r} (most recent call last):', file=file)
+
+    traceback.print_list(extracted_list, file=file)
+    if exc is not None:
+        for line in traceback.format_exception_only(exc.__class__, exc):
+            print(line, file=file, end='')

janus/lib/python3.10/asyncio/coroutines.py

@@ -0,0 +1,269 @@
+__all__ = 'coroutine', 'iscoroutinefunction', 'iscoroutine'
+
+import collections.abc
+import functools
+import inspect
+import os
+import sys
+import traceback
+import types
+import warnings
+
+from . import base_futures
+from . import constants
+from . import format_helpers
+from .log import logger
+
+
+def _is_debug_mode():
+    # If you set _DEBUG to true, @coroutine will wrap the resulting
+    # generator objects in a CoroWrapper instance (defined below).  That
+    # instance will log a message when the generator is never iterated
+    # over, which may happen when you forget to use "await" or "yield from"
+    # with a coroutine call.
+    # Note that the value of the _DEBUG flag is taken
+    # when the decorator is used, so to be of any use it must be set
+    # before you define your coroutines.  A downside of using this feature
+    # is that tracebacks show entries for the CoroWrapper.__next__ method
+    # when _DEBUG is true.
+    return sys.flags.dev_mode or (not sys.flags.ignore_environment and
+                                  bool(os.environ.get('PYTHONASYNCIODEBUG')))
+
+
+_DEBUG = _is_debug_mode()
+
+
+class CoroWrapper:
+    # Wrapper for coroutine object in _DEBUG mode.
+
+    def __init__(self, gen, func=None):
+        assert inspect.isgenerator(gen) or inspect.iscoroutine(gen), gen
+        self.gen = gen
+        self.func = func  # Used to unwrap @coroutine decorator
+        self._source_traceback = format_helpers.extract_stack(sys._getframe(1))
+        self.__name__ = getattr(gen, '__name__', None)
+        self.__qualname__ = getattr(gen, '__qualname__', None)
+
+    def __repr__(self):
+        coro_repr = _format_coroutine(self)
+        if self._source_traceback:
+            frame = self._source_traceback[-1]
+            coro_repr += f', created at {frame[0]}:{frame[1]}'
+
+        return f'<{self.__class__.__name__} {coro_repr}>'
+
+    def __iter__(self):
+        return self
+
+    def __next__(self):
+        return self.gen.send(None)
+
+    def send(self, value):
+        return self.gen.send(value)
+
+    def throw(self, type, value=None, traceback=None):
+        return self.gen.throw(type, value, traceback)
+
+    def close(self):
+        return self.gen.close()
+
+    @property
+    def gi_frame(self):
+        return self.gen.gi_frame
+
+    @property
+    def gi_running(self):
+        return self.gen.gi_running
+
+    @property
+    def gi_code(self):
+        return self.gen.gi_code
+
+    def __await__(self):
+        return self
+
+    @property
+    def gi_yieldfrom(self):
+        return self.gen.gi_yieldfrom
+
+    def __del__(self):
+        # Be careful accessing self.gen.frame -- self.gen might not exist.
+        gen = getattr(self, 'gen', None)
+        frame = getattr(gen, 'gi_frame', None)
+        if frame is not None and frame.f_lasti == -1:
+            msg = f'{self!r} was never yielded from'
+            tb = getattr(self, '_source_traceback', ())
+            if tb:
+                tb = ''.join(traceback.format_list(tb))
+                msg += (f'\nCoroutine object created at '
+                        f'(most recent call last, truncated to '
+                        f'{constants.DEBUG_STACK_DEPTH} last lines):\n')
+                msg += tb.rstrip()
+            logger.error(msg)
+
+
+def coroutine(func):
+    """Decorator to mark coroutines.
+
+    If the coroutine is not yielded from before it is destroyed,
+    an error message is logged.
+    """
+    warnings.warn('"@coroutine" decorator is deprecated since Python 3.8, use "async def" instead',
+                  DeprecationWarning,
+                  stacklevel=2)
+    if inspect.iscoroutinefunction(func):
+        # In Python 3.5 that's all we need to do for coroutines
+        # defined with "async def".
+        return func
+
+    if inspect.isgeneratorfunction(func):
+        coro = func
+    else:
+        @functools.wraps(func)
+        def coro(*args, **kw):
+            res = func(*args, **kw)
+            if (base_futures.isfuture(res) or inspect.isgenerator(res) or
+                    isinstance(res, CoroWrapper)):
+                res = yield from res
+            else:
+                # If 'res' is an awaitable, run it.
+                try:
+                    await_meth = res.__await__
+                except AttributeError:
+                    pass
+                else:
+                    if isinstance(res, collections.abc.Awaitable):
+                        res = yield from await_meth()
+            return res
+
+    coro = types.coroutine(coro)
+    if not _DEBUG:
+        wrapper = coro
+    else:
+        @functools.wraps(func)
+        def wrapper(*args, **kwds):
+            w = CoroWrapper(coro(*args, **kwds), func=func)
+            if w._source_traceback:
+                del w._source_traceback[-1]
+            # Python < 3.5 does not implement __qualname__
+            # on generator objects, so we set it manually.
+            # We use getattr as some callables (such as
+            # functools.partial may lack __qualname__).
+            w.__name__ = getattr(func, '__name__', None)
+            w.__qualname__ = getattr(func, '__qualname__', None)
+            return w
+
+    wrapper._is_coroutine = _is_coroutine  # For iscoroutinefunction().
+    return wrapper
+
+
+# A marker for iscoroutinefunction.
+_is_coroutine = object()
+
+
+def iscoroutinefunction(func):
+    """Return True if func is a decorated coroutine function."""
+    return (inspect.iscoroutinefunction(func) or
+            getattr(func, '_is_coroutine', None) is _is_coroutine)
+
+
+# Prioritize native coroutine check to speed-up
+# asyncio.iscoroutine.
+_COROUTINE_TYPES = (types.CoroutineType, types.GeneratorType,
+                    collections.abc.Coroutine, CoroWrapper)
+_iscoroutine_typecache = set()
+
+
+def iscoroutine(obj):
+    """Return True if obj is a coroutine object."""
+    if type(obj) in _iscoroutine_typecache:
+        return True
+
+    if isinstance(obj, _COROUTINE_TYPES):
+        # Just in case we don't want to cache more than 100
+        # positive types.  That shouldn't ever happen, unless
+        # someone stressing the system on purpose.
+        if len(_iscoroutine_typecache) < 100:
+            _iscoroutine_typecache.add(type(obj))
+        return True
+    else:
+        return False
+
+
+def _format_coroutine(coro):
+    assert iscoroutine(coro)
+
+    is_corowrapper = isinstance(coro, CoroWrapper)
+
+    def get_name(coro):
+        # Coroutines compiled with Cython sometimes don't have
+        # proper __qualname__ or __name__.  While that is a bug
+        # in Cython, asyncio shouldn't crash with an AttributeError
+        # in its __repr__ functions.
+        if is_corowrapper:
+            return format_helpers._format_callback(coro.func, (), {})
+
+        if hasattr(coro, '__qualname__') and coro.__qualname__:
+            coro_name = coro.__qualname__
+        elif hasattr(coro, '__name__') and coro.__name__:
+            coro_name = coro.__name__
+        else:
+            # Stop masking Cython bugs, expose them in a friendly way.
+            coro_name = f'<{type(coro).__name__} without __name__>'
+        return f'{coro_name}()'
+
+    def is_running(coro):
+        try:
+            return coro.cr_running
+        except AttributeError:
+            try:
+                return coro.gi_running
+            except AttributeError:
+                return False
+
+    coro_code = None
+    if hasattr(coro, 'cr_code') and coro.cr_code:
+        coro_code = coro.cr_code
+    elif hasattr(coro, 'gi_code') and coro.gi_code:
+        coro_code = coro.gi_code
+
+    coro_name = get_name(coro)
+
+    if not coro_code:
+        # Built-in types might not have __qualname__ or __name__.
+        if is_running(coro):
+            return f'{coro_name} running'
+        else:
+            return coro_name
+
+    coro_frame = None
+    if hasattr(coro, 'gi_frame') and coro.gi_frame:
+        coro_frame = coro.gi_frame
+    elif hasattr(coro, 'cr_frame') and coro.cr_frame:
+        coro_frame = coro.cr_frame
+
+    # If Cython's coroutine has a fake code object without proper
+    # co_filename -- expose that.
+    filename = coro_code.co_filename or '<empty co_filename>'
+
+    lineno = 0
+    if (is_corowrapper and
+            coro.func is not None and
+            not inspect.isgeneratorfunction(coro.func)):
+        source = format_helpers._get_function_source(coro.func)
+        if source is not None:
+            filename, lineno = source
+        if coro_frame is None:
+            coro_repr = f'{coro_name} done, defined at {filename}:{lineno}'
+        else:
+            coro_repr = f'{coro_name} running, defined at {filename}:{lineno}'
+
+    elif coro_frame is not None:
+        lineno = coro_frame.f_lineno
+        coro_repr = f'{coro_name} running at {filename}:{lineno}'
+
+    else:
+        lineno = coro_code.co_firstlineno
+        coro_repr = f'{coro_name} done, defined at {filename}:{lineno}'
+
+    return coro_repr

janus/lib/python3.10/asyncio/events.py

@@ -0,0 +1,819 @@
+"""Event loop and event loop policy."""
+
+__all__ = (
+    'AbstractEventLoopPolicy',
+    'AbstractEventLoop', 'AbstractServer',
+    'Handle', 'TimerHandle',
+    'get_event_loop_policy', 'set_event_loop_policy',
+    'get_event_loop', 'set_event_loop', 'new_event_loop',
+    'get_child_watcher', 'set_child_watcher',
+    '_set_running_loop', 'get_running_loop',
+    '_get_running_loop',
+)
+
+import contextvars
+import os
+import socket
+import subprocess
+import sys
+import threading
+
+from . import format_helpers
+
+
+class Handle:
+    """Object returned by callback registration methods."""
+
+    __slots__ = ('_callback', '_args', '_cancelled', '_loop',
+                 '_source_traceback', '_repr', '__weakref__',
+                 '_context')
+
+    def __init__(self, callback, args, loop, context=None):
+        if context is None:
+            context = contextvars.copy_context()
+        self._context = context
+        self._loop = loop
+        self._callback = callback
+        self._args = args
+        self._cancelled = False
+        self._repr = None
+        if self._loop.get_debug():
+            self._source_traceback = format_helpers.extract_stack(
+                sys._getframe(1))
+        else:
+            self._source_traceback = None
+
+    def _repr_info(self):
+        info = [self.__class__.__name__]
+        if self._cancelled:
+            info.append('cancelled')
+        if self._callback is not None:
+            info.append(format_helpers._format_callback_source(
+                self._callback, self._args))
+        if self._source_traceback:
+            frame = self._source_traceback[-1]
+            info.append(f'created at {frame[0]}:{frame[1]}')
+        return info
+
+    def __repr__(self):
+        if self._repr is not None:
+            return self._repr
+        info = self._repr_info()
+        return '<{}>'.format(' '.join(info))
+
+    def cancel(self):
+        if not self._cancelled:
+            self._cancelled = True
+            if self._loop.get_debug():
+                # Keep a representation in debug mode to keep callback and
+                # parameters. For example, to log the warning
+                # "Executing <Handle...> took 2.5 second"
+                self._repr = repr(self)
+            self._callback = None
+            self._args = None
+
+    def cancelled(self):
+        return self._cancelled
+
+    def _run(self):
+        try:
+            self._context.run(self._callback, *self._args)
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            cb = format_helpers._format_callback_source(
+                self._callback, self._args)
+            msg = f'Exception in callback {cb}'
+            context = {
+                'message': msg,
+                'exception': exc,
+                'handle': self,
+            }
+            if self._source_traceback:
+                context['source_traceback'] = self._source_traceback
+            self._loop.call_exception_handler(context)
+        self = None  # Needed to break cycles when an exception occurs.
+
+
+class TimerHandle(Handle):
+    """Object returned by timed callback registration methods."""
+
+    __slots__ = ['_scheduled', '_when']
+
+    def __init__(self, when, callback, args, loop, context=None):
+        assert when is not None
+        super().__init__(callback, args, loop, context)
+        if self._source_traceback:
+            del self._source_traceback[-1]
+        self._when = when
+        self._scheduled = False
+
+    def _repr_info(self):
+        info = super()._repr_info()
+        pos = 2 if self._cancelled else 1
+        info.insert(pos, f'when={self._when}')
+        return info
+
+    def __hash__(self):
+        return hash(self._when)
+
+    def __lt__(self, other):
+        if isinstance(other, TimerHandle):
+            return self._when < other._when
+        return NotImplemented
+
+    def __le__(self, other):
+        if isinstance(other, TimerHandle):
+            return self._when < other._when or self.__eq__(other)
+        return NotImplemented
+
+    def __gt__(self, other):
+        if isinstance(other, TimerHandle):
+            return self._when > other._when
+        return NotImplemented
+
+    def __ge__(self, other):
+        if isinstance(other, TimerHandle):
+            return self._when > other._when or self.__eq__(other)
+        return NotImplemented
+
+    def __eq__(self, other):
+        if isinstance(other, TimerHandle):
+            return (self._when == other._when and
+                    self._callback == other._callback and
+                    self._args == other._args and
+                    self._cancelled == other._cancelled)
+        return NotImplemented
+
+    def cancel(self):
+        if not self._cancelled:
+            self._loop._timer_handle_cancelled(self)
+        super().cancel()
+
+    def when(self):
+        """Return a scheduled callback time.
+
+        The time is an absolute timestamp, using the same time
+        reference as loop.time().
+        """
+        return self._when
+
+
+class AbstractServer:
+    """Abstract server returned by create_server()."""
+
+    def close(self):
+        """Stop serving.  This leaves existing connections open."""
+        raise NotImplementedError
+
+    def get_loop(self):
+        """Get the event loop the Server object is attached to."""
+        raise NotImplementedError
+
+    def is_serving(self):
+        """Return True if the server is accepting connections."""
+        raise NotImplementedError
+
+    async def start_serving(self):
+        """Start accepting connections.
+
+        This method is idempotent, so it can be called when
+        the server is already being serving.
+        """
+        raise NotImplementedError
+
+    async def serve_forever(self):
+        """Start accepting connections until the coroutine is cancelled.
+
+        The server is closed when the coroutine is cancelled.
+        """
+        raise NotImplementedError
+
+    async def wait_closed(self):
+        """Coroutine to wait until service is closed."""
+        raise NotImplementedError
+
+    async def __aenter__(self):
+        return self
+
+    async def __aexit__(self, *exc):
+        self.close()
+        await self.wait_closed()
+
+
+class AbstractEventLoop:
+    """Abstract event loop."""
+
+    # Running and stopping the event loop.
+
+    def run_forever(self):
+        """Run the event loop until stop() is called."""
+        raise NotImplementedError
+
+    def run_until_complete(self, future):
+        """Run the event loop until a Future is done.
+
+        Return the Future's result, or raise its exception.
+        """
+        raise NotImplementedError
+
+    def stop(self):
+        """Stop the event loop as soon as reasonable.
+
+        Exactly how soon that is may depend on the implementation, but
+        no more I/O callbacks should be scheduled.
+        """
+        raise NotImplementedError
+
+    def is_running(self):
+        """Return whether the event loop is currently running."""
+        raise NotImplementedError
+
+    def is_closed(self):
+        """Returns True if the event loop was closed."""
+        raise NotImplementedError
+
+    def close(self):
+        """Close the loop.
+
+        The loop should not be running.
+
+        This is idempotent and irreversible.
+
+        No other methods should be called after this one.
+        """
+        raise NotImplementedError
+
+    async def shutdown_asyncgens(self):
+        """Shutdown all active asynchronous generators."""
+        raise NotImplementedError
+
+    async def shutdown_default_executor(self):
+        """Schedule the shutdown of the default executor."""
+        raise NotImplementedError
+
+    # Methods scheduling callbacks.  All these return Handles.
+
+    def _timer_handle_cancelled(self, handle):
+        """Notification that a TimerHandle has been cancelled."""
+        raise NotImplementedError
+
+    def call_soon(self, callback, *args, context=None):
+        return self.call_later(0, callback, *args, context=context)
+
+    def call_later(self, delay, callback, *args, context=None):
+        raise NotImplementedError
+
+    def call_at(self, when, callback, *args, context=None):
+        raise NotImplementedError
+
+    def time(self):
+        raise NotImplementedError
+
+    def create_future(self):
+        raise NotImplementedError
+
+    # Method scheduling a coroutine object: create a task.
+
+    def create_task(self, coro, *, name=None):
+        raise NotImplementedError
+
+    # Methods for interacting with threads.
+
+    def call_soon_threadsafe(self, callback, *args, context=None):
+        raise NotImplementedError
+
+    def run_in_executor(self, executor, func, *args):
+        raise NotImplementedError
+
+    def set_default_executor(self, executor):
+        raise NotImplementedError
+
+    # Network I/O methods returning Futures.
+
+    async def getaddrinfo(self, host, port, *,
+                          family=0, type=0, proto=0, flags=0):
+        raise NotImplementedError
+
+    async def getnameinfo(self, sockaddr, flags=0):
+        raise NotImplementedError
+
+    async def create_connection(
+            self, protocol_factory, host=None, port=None,
+            *, ssl=None, family=0, proto=0,
+            flags=0, sock=None, local_addr=None,
+            server_hostname=None,
+            ssl_handshake_timeout=None,
+            happy_eyeballs_delay=None, interleave=None):
+        raise NotImplementedError
+
+    async def create_server(
+            self, protocol_factory, host=None, port=None,
+            *, family=socket.AF_UNSPEC,
+            flags=socket.AI_PASSIVE, sock=None, backlog=100,
+            ssl=None, reuse_address=None, reuse_port=None,
+            ssl_handshake_timeout=None,
+            start_serving=True):
+        """A coroutine which creates a TCP server bound to host and port.
+
+        The return value is a Server object which can be used to stop
+        the service.
+
+        If host is an empty string or None all interfaces are assumed
+        and a list of multiple sockets will be returned (most likely
+        one for IPv4 and another one for IPv6). The host parameter can also be
+        a sequence (e.g. list) of hosts to bind to.
+
+        family can be set to either AF_INET or AF_INET6 to force the
+        socket to use IPv4 or IPv6. If not set it will be determined
+        from host (defaults to AF_UNSPEC).
+
+        flags is a bitmask for getaddrinfo().
+
+        sock can optionally be specified in order to use a preexisting
+        socket object.
+
+        backlog is the maximum number of queued connections passed to
+        listen() (defaults to 100).
+
+        ssl can be set to an SSLContext to enable SSL over the
+        accepted connections.
+
+        reuse_address tells the kernel to reuse a local socket in
+        TIME_WAIT state, without waiting for its natural timeout to
+        expire. If not specified will automatically be set to True on
+        UNIX.
+
+        reuse_port tells the kernel to allow this endpoint to be bound to
+        the same port as other existing endpoints are bound to, so long as
+        they all set this flag when being created. This option is not
+        supported on Windows.
+
+        ssl_handshake_timeout is the time in seconds that an SSL server
+        will wait for completion of the SSL handshake before aborting the
+        connection. Default is 60s.
+
+        start_serving set to True (default) causes the created server
+        to start accepting connections immediately.  When set to False,
+        the user should await Server.start_serving() or Server.serve_forever()
+        to make the server to start accepting connections.
+        """
+        raise NotImplementedError
+
+    async def sendfile(self, transport, file, offset=0, count=None,
+                       *, fallback=True):
+        """Send a file through a transport.
+
+        Return an amount of sent bytes.
+        """
+        raise NotImplementedError
+
+    async def start_tls(self, transport, protocol, sslcontext, *,
+                        server_side=False,
+                        server_hostname=None,
+                        ssl_handshake_timeout=None):
+        """Upgrade a transport to TLS.
+
+        Return a new transport that *protocol* should start using
+        immediately.
+        """
+        raise NotImplementedError
+
+    async def create_unix_connection(
+            self, protocol_factory, path=None, *,
+            ssl=None, sock=None,
+            server_hostname=None,
+            ssl_handshake_timeout=None):
+        raise NotImplementedError
+
+    async def create_unix_server(
+            self, protocol_factory, path=None, *,
+            sock=None, backlog=100, ssl=None,
+            ssl_handshake_timeout=None,
+            start_serving=True):
+        """A coroutine which creates a UNIX Domain Socket server.
+
+        The return value is a Server object, which can be used to stop
+        the service.
+
+        path is a str, representing a file system path to bind the
+        server socket to.
+
+        sock can optionally be specified in order to use a preexisting
+        socket object.
+
+        backlog is the maximum number of queued connections passed to
+        listen() (defaults to 100).
+
+        ssl can be set to an SSLContext to enable SSL over the
+        accepted connections.
+
+        ssl_handshake_timeout is the time in seconds that an SSL server
+        will wait for the SSL handshake to complete (defaults to 60s).
+
+        start_serving set to True (default) causes the created server
+        to start accepting connections immediately.  When set to False,
+        the user should await Server.start_serving() or Server.serve_forever()
+        to make the server to start accepting connections.
+        """
+        raise NotImplementedError
+
+    async def connect_accepted_socket(
+            self, protocol_factory, sock,
+            *, ssl=None,
+            ssl_handshake_timeout=None):
+        """Handle an accepted connection.
+
+        This is used by servers that accept connections outside of
+        asyncio, but use asyncio to handle connections.
+
+        This method is a coroutine.  When completed, the coroutine
+        returns a (transport, protocol) pair.
+        """
+        raise NotImplementedError
+
+    async def create_datagram_endpoint(self, protocol_factory,
+                                       local_addr=None, remote_addr=None, *,
+                                       family=0, proto=0, flags=0,
+                                       reuse_address=None, reuse_port=None,
+                                       allow_broadcast=None, sock=None):
+        """A coroutine which creates a datagram endpoint.
+
+        This method will try to establish the endpoint in the background.
+        When successful, the coroutine returns a (transport, protocol) pair.
+
+        protocol_factory must be a callable returning a protocol instance.
+
+        socket family AF_INET, socket.AF_INET6 or socket.AF_UNIX depending on
+        host (or family if specified), socket type SOCK_DGRAM.
+
+        reuse_address tells the kernel to reuse a local socket in
+        TIME_WAIT state, without waiting for its natural timeout to
+        expire. If not specified it will automatically be set to True on
+        UNIX.
+
+        reuse_port tells the kernel to allow this endpoint to be bound to
+        the same port as other existing endpoints are bound to, so long as
+        they all set this flag when being created. This option is not
+        supported on Windows and some UNIX's. If the
+        :py:data:`~socket.SO_REUSEPORT` constant is not defined then this
+        capability is unsupported.
+
+        allow_broadcast tells the kernel to allow this endpoint to send
+        messages to the broadcast address.
+
+        sock can optionally be specified in order to use a preexisting
+        socket object.
+        """
+        raise NotImplementedError
+
+    # Pipes and subprocesses.
+
+    async def connect_read_pipe(self, protocol_factory, pipe):
+        """Register read pipe in event loop. Set the pipe to non-blocking mode.
+
+        protocol_factory should instantiate object with Protocol interface.
+        pipe is a file-like object.
+        Return pair (transport, protocol), where transport supports the
+        ReadTransport interface."""
+        # The reason to accept file-like object instead of just file descriptor
+        # is: we need to own pipe and close it at transport finishing
+        # Can got complicated errors if pass f.fileno(),
+        # close fd in pipe transport then close f and vice versa.
+        raise NotImplementedError
+
+    async def connect_write_pipe(self, protocol_factory, pipe):
+        """Register write pipe in event loop.
+
+        protocol_factory should instantiate object with BaseProtocol interface.
+        Pipe is file-like object already switched to nonblocking.
+        Return pair (transport, protocol), where transport support
+        WriteTransport interface."""
+        # The reason to accept file-like object instead of just file descriptor
+        # is: we need to own pipe and close it at transport finishing
+        # Can got complicated errors if pass f.fileno(),
+        # close fd in pipe transport then close f and vice versa.
+        raise NotImplementedError
+
+    async def subprocess_shell(self, protocol_factory, cmd, *,
+                               stdin=subprocess.PIPE,
+                               stdout=subprocess.PIPE,
+                               stderr=subprocess.PIPE,
+                               **kwargs):
+        raise NotImplementedError
+
+    async def subprocess_exec(self, protocol_factory, *args,
+                              stdin=subprocess.PIPE,
+                              stdout=subprocess.PIPE,
+                              stderr=subprocess.PIPE,
+                              **kwargs):
+        raise NotImplementedError
+
+    # Ready-based callback registration methods.
+    # The add_*() methods return None.
+    # The remove_*() methods return True if something was removed,
+    # False if there was nothing to delete.
+
+    def add_reader(self, fd, callback, *args):
+        raise NotImplementedError
+
+    def remove_reader(self, fd):
+        raise NotImplementedError
+
+    def add_writer(self, fd, callback, *args):
+        raise NotImplementedError
+
+    def remove_writer(self, fd):
+        raise NotImplementedError
+
+    # Completion based I/O methods returning Futures.
+
+    async def sock_recv(self, sock, nbytes):
+        raise NotImplementedError
+
+    async def sock_recv_into(self, sock, buf):
+        raise NotImplementedError
+
+    async def sock_sendall(self, sock, data):
+        raise NotImplementedError
+
+    async def sock_connect(self, sock, address):
+        raise NotImplementedError
+
+    async def sock_accept(self, sock):
+        raise NotImplementedError
+
+    async def sock_sendfile(self, sock, file, offset=0, count=None,
+                            *, fallback=None):
+        raise NotImplementedError
+
+    # Signal handling.
+
+    def add_signal_handler(self, sig, callback, *args):
+        raise NotImplementedError
+
+    def remove_signal_handler(self, sig):
+        raise NotImplementedError
+
+    # Task factory.
+
+    def set_task_factory(self, factory):
+        raise NotImplementedError
+
+    def get_task_factory(self):
+        raise NotImplementedError
+
+    # Error handlers.
+
+    def get_exception_handler(self):
+        raise NotImplementedError
+
+    def set_exception_handler(self, handler):
+        raise NotImplementedError
+
+    def default_exception_handler(self, context):
+        raise NotImplementedError
+
+    def call_exception_handler(self, context):
+        raise NotImplementedError
+
+    # Debug flag management.
+
+    def get_debug(self):
+        raise NotImplementedError
+
+    def set_debug(self, enabled):
+        raise NotImplementedError
+
+
+class AbstractEventLoopPolicy:
+    """Abstract policy for accessing the event loop."""
+
+    def get_event_loop(self):
+        """Get the event loop for the current context.
+
+        Returns an event loop object implementing the BaseEventLoop interface,
+        or raises an exception in case no event loop has been set for the
+        current context and the current policy does not specify to create one.
+
+        It should never return None."""
+        raise NotImplementedError
+
+    def set_event_loop(self, loop):
+        """Set the event loop for the current context to loop."""
+        raise NotImplementedError
+
+    def new_event_loop(self):
+        """Create and return a new event loop object according to this
+        policy's rules. If there's need to set this loop as the event loop for
+        the current context, set_event_loop must be called explicitly."""
+        raise NotImplementedError
+
+    # Child processes handling (Unix only).
+
+    def get_child_watcher(self):
+        "Get the watcher for child processes."
+        raise NotImplementedError
+
+    def set_child_watcher(self, watcher):
+        """Set the watcher for child processes."""
+        raise NotImplementedError
+
+
+class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy):
+    """Default policy implementation for accessing the event loop.
+
+    In this policy, each thread has its own event loop.  However, we
+    only automatically create an event loop by default for the main
+    thread; other threads by default have no event loop.
+
+    Other policies may have different rules (e.g. a single global
+    event loop, or automatically creating an event loop per thread, or
+    using some other notion of context to which an event loop is
+    associated).
+    """
+
+    _loop_factory = None
+
+    class _Local(threading.local):
+        _loop = None
+        _set_called = False
+
+    def __init__(self):
+        self._local = self._Local()
+
+    def get_event_loop(self):
+        """Get the event loop for the current context.
+
+        Returns an instance of EventLoop or raises an exception.
+        """
+        if (self._local._loop is None and
+                not self._local._set_called and
+                threading.current_thread() is threading.main_thread()):
+            self.set_event_loop(self.new_event_loop())
+
+        if self._local._loop is None:
+            raise RuntimeError('There is no current event loop in thread %r.'
+                               % threading.current_thread().name)
+
+        return self._local._loop
+
+    def set_event_loop(self, loop):
+        """Set the event loop."""
+        self._local._set_called = True
+        assert loop is None or isinstance(loop, AbstractEventLoop)
+        self._local._loop = loop
+
+    def new_event_loop(self):
+        """Create a new event loop.
+
+        You must call set_event_loop() to make this the current event
+        loop.
+        """
+        return self._loop_factory()
+
+
+# Event loop policy.  The policy itself is always global, even if the
+# policy's rules say that there is an event loop per thread (or other
+# notion of context).  The default policy is installed by the first
+# call to get_event_loop_policy().
+_event_loop_policy = None
+
+# Lock for protecting the on-the-fly creation of the event loop policy.
+_lock = threading.Lock()
+
+
+# A TLS for the running event loop, used by _get_running_loop.
+class _RunningLoop(threading.local):
+    loop_pid = (None, None)
+
+
+_running_loop = _RunningLoop()
+
+
+def get_running_loop():
+    """Return the running event loop.  Raise a RuntimeError if there is none.
+
+    This function is thread-specific.
+    """
+    # NOTE: this function is implemented in C (see _asynciomodule.c)
+    loop = _get_running_loop()
+    if loop is None:
+        raise RuntimeError('no running event loop')
+    return loop
+
+
+def _get_running_loop():
+    """Return the running event loop or None.
+
+    This is a low-level function intended to be used by event loops.
+    This function is thread-specific.
+    """
+    # NOTE: this function is implemented in C (see _asynciomodule.c)
+    running_loop, pid = _running_loop.loop_pid
+    if running_loop is not None and pid == os.getpid():
+        return running_loop
+
+
+def _set_running_loop(loop):
+    """Set the running event loop.
+
+    This is a low-level function intended to be used by event loops.
+    This function is thread-specific.
+    """
+    # NOTE: this function is implemented in C (see _asynciomodule.c)
+    _running_loop.loop_pid = (loop, os.getpid())
+
+
+def _init_event_loop_policy():
+    global _event_loop_policy
+    with _lock:
+        if _event_loop_policy is None:  # pragma: no branch
+            from . import DefaultEventLoopPolicy
+            _event_loop_policy = DefaultEventLoopPolicy()
+
+
+def get_event_loop_policy():
+    """Get the current event loop policy."""
+    if _event_loop_policy is None:
+        _init_event_loop_policy()
+    return _event_loop_policy
+
+
+def set_event_loop_policy(policy):
+    """Set the current event loop policy.
+
+    If policy is None, the default policy is restored."""
+    global _event_loop_policy
+    assert policy is None or isinstance(policy, AbstractEventLoopPolicy)
+    _event_loop_policy = policy
+
+
+def get_event_loop():
+    """Return an asyncio event loop.
+
+    When called from a coroutine or a callback (e.g. scheduled with call_soon
+    or similar API), this function will always return the running event loop.
+
+    If there is no running event loop set, the function will return
+    the result of `get_event_loop_policy().get_event_loop()` call.
+    """
+    # NOTE: this function is implemented in C (see _asynciomodule.c)
+    return _py__get_event_loop()
+
+
+def _get_event_loop(stacklevel=3):
+    # This internal method is going away in Python 3.12, left here only for
+    # backwards compatibility with 3.10.0 - 3.10.8 and 3.11.0.
+    # Similarly, this method's C equivalent in _asyncio is going away as well.
+    # See GH-99949 for more details.
+    current_loop = _get_running_loop()
+    if current_loop is not None:
+        return current_loop
+    return get_event_loop_policy().get_event_loop()
+
+
+def set_event_loop(loop):
+    """Equivalent to calling get_event_loop_policy().set_event_loop(loop)."""
+    get_event_loop_policy().set_event_loop(loop)
+
+
+def new_event_loop():
+    """Equivalent to calling get_event_loop_policy().new_event_loop()."""
+    return get_event_loop_policy().new_event_loop()
+
+
+def get_child_watcher():
+    """Equivalent to calling get_event_loop_policy().get_child_watcher()."""
+    return get_event_loop_policy().get_child_watcher()
+
+
+def set_child_watcher(watcher):
+    """Equivalent to calling
+    get_event_loop_policy().set_child_watcher(watcher)."""
+    return get_event_loop_policy().set_child_watcher(watcher)
+
+
+# Alias pure-Python implementations for testing purposes.
+_py__get_running_loop = _get_running_loop
+_py__set_running_loop = _set_running_loop
+_py_get_running_loop = get_running_loop
+_py_get_event_loop = get_event_loop
+_py__get_event_loop = _get_event_loop
+
+
+try:
+    # get_event_loop() is one of the most frequently called
+    # functions in asyncio.  Pure Python implementation is
+    # about 4 times slower than C-accelerated.
+    from _asyncio import (_get_running_loop, _set_running_loop,
+                          get_running_loop, get_event_loop, _get_event_loop)
+except ImportError:
+    pass
+else:
+    # Alias C implementations for testing purposes.
+    _c__get_running_loop = _get_running_loop
+    _c__set_running_loop = _set_running_loop
+    _c_get_running_loop = get_running_loop
+    _c_get_event_loop = get_event_loop
+    _c__get_event_loop = _get_event_loop

janus/lib/python3.10/asyncio/exceptions.py

@@ -0,0 +1,58 @@
+"""asyncio exceptions."""
+
+
+__all__ = ('CancelledError', 'InvalidStateError', 'TimeoutError',
+           'IncompleteReadError', 'LimitOverrunError',
+           'SendfileNotAvailableError')
+
+
+class CancelledError(BaseException):
+    """The Future or Task was cancelled."""
+
+
+class TimeoutError(Exception):
+    """The operation exceeded the given deadline."""
+
+
+class InvalidStateError(Exception):
+    """The operation is not allowed in this state."""
+
+
+class SendfileNotAvailableError(RuntimeError):
+    """Sendfile syscall is not available.
+
+    Raised if OS does not support sendfile syscall for given socket or
+    file type.
+    """
+
+
+class IncompleteReadError(EOFError):
+    """
+    Incomplete read error. Attributes:
+
+    - partial: read bytes string before the end of stream was reached
+    - expected: total number of expected bytes (or None if unknown)
+    """
+    def __init__(self, partial, expected):
+        r_expected = 'undefined' if expected is None else repr(expected)
+        super().__init__(f'{len(partial)} bytes read on a total of '
+                         f'{r_expected} expected bytes')
+        self.partial = partial
+        self.expected = expected
+
+    def __reduce__(self):
+        return type(self), (self.partial, self.expected)
+
+
+class LimitOverrunError(Exception):
+    """Reached the buffer limit while looking for a separator.
+
+    Attributes:
+    - consumed: total number of to be consumed bytes.
+    """
+    def __init__(self, message, consumed):
+        super().__init__(message)
+        self.consumed = consumed
+
+    def __reduce__(self):
+        return type(self), (self.args[0], self.consumed)

janus/lib/python3.10/asyncio/format_helpers.py

@@ -0,0 +1,76 @@
+import functools
+import inspect
+import reprlib
+import sys
+import traceback
+
+from . import constants
+
+
+def _get_function_source(func):
+    func = inspect.unwrap(func)
+    if inspect.isfunction(func):
+        code = func.__code__
+        return (code.co_filename, code.co_firstlineno)
+    if isinstance(func, functools.partial):
+        return _get_function_source(func.func)
+    if isinstance(func, functools.partialmethod):
+        return _get_function_source(func.func)
+    return None
+
+
+def _format_callback_source(func, args):
+    func_repr = _format_callback(func, args, None)
+    source = _get_function_source(func)
+    if source:
+        func_repr += f' at {source[0]}:{source[1]}'
+    return func_repr
+
+
+def _format_args_and_kwargs(args, kwargs):
+    """Format function arguments and keyword arguments.
+
+    Special case for a single parameter: ('hello',) is formatted as ('hello').
+    """
+    # use reprlib to limit the length of the output
+    items = []
+    if args:
+        items.extend(reprlib.repr(arg) for arg in args)
+    if kwargs:
+        items.extend(f'{k}={reprlib.repr(v)}' for k, v in kwargs.items())
+    return '({})'.format(', '.join(items))
+
+
+def _format_callback(func, args, kwargs, suffix=''):
+    if isinstance(func, functools.partial):
+        suffix = _format_args_and_kwargs(args, kwargs) + suffix
+        return _format_callback(func.func, func.args, func.keywords, suffix)
+
+    if hasattr(func, '__qualname__') and func.__qualname__:
+        func_repr = func.__qualname__
+    elif hasattr(func, '__name__') and func.__name__:
+        func_repr = func.__name__
+    else:
+        func_repr = repr(func)
+
+    func_repr += _format_args_and_kwargs(args, kwargs)
+    if suffix:
+        func_repr += suffix
+    return func_repr
+
+
+def extract_stack(f=None, limit=None):
+    """Replacement for traceback.extract_stack() that only does the
+    necessary work for asyncio debug mode.
+    """
+    if f is None:
+        f = sys._getframe().f_back
+    if limit is None:
+        # Limit the amount of work to a reasonable amount, as extract_stack()
+        # can be called for each coroutine and future in debug mode.
+        limit = constants.DEBUG_STACK_DEPTH
+    stack = traceback.StackSummary.extract(traceback.walk_stack(f),
+                                           limit=limit,
+                                           lookup_lines=False)
+    stack.reverse()
+    return stack

janus/lib/python3.10/asyncio/futures.py

@@ -0,0 +1,426 @@
+"""A Future class similar to the one in PEP 3148."""
+
+__all__ = (
+    'Future', 'wrap_future', 'isfuture',
+)
+
+import concurrent.futures
+import contextvars
+import logging
+import sys
+from types import GenericAlias
+
+from . import base_futures
+from . import events
+from . import exceptions
+from . import format_helpers
+
+
+isfuture = base_futures.isfuture
+
+
+_PENDING = base_futures._PENDING
+_CANCELLED = base_futures._CANCELLED
+_FINISHED = base_futures._FINISHED
+
+
+STACK_DEBUG = logging.DEBUG - 1  # heavy-duty debugging
+
+
+class Future:
+    """This class is *almost* compatible with concurrent.futures.Future.
+
+    Differences:
+
+    - This class is not thread-safe.
+
+    - result() and exception() do not take a timeout argument and
+      raise an exception when the future isn't done yet.
+
+    - Callbacks registered with add_done_callback() are always called
+      via the event loop's call_soon().
+
+    - This class is not compatible with the wait() and as_completed()
+      methods in the concurrent.futures package.
+
+    (In Python 3.4 or later we may be able to unify the implementations.)
+    """
+
+    # Class variables serving as defaults for instance variables.
+    _state = _PENDING
+    _result = None
+    _exception = None
+    _loop = None
+    _source_traceback = None
+    _cancel_message = None
+    # A saved CancelledError for later chaining as an exception context.
+    _cancelled_exc = None
+
+    # This field is used for a dual purpose:
+    # - Its presence is a marker to declare that a class implements
+    #   the Future protocol (i.e. is intended to be duck-type compatible).
+    #   The value must also be not-None, to enable a subclass to declare
+    #   that it is not compatible by setting this to None.
+    # - It is set by __iter__() below so that Task._step() can tell
+    #   the difference between
+    #   `await Future()` or`yield from Future()` (correct) vs.
+    #   `yield Future()` (incorrect).
+    _asyncio_future_blocking = False
+
+    __log_traceback = False
+
+    def __init__(self, *, loop=None):
+        """Initialize the future.
+
+        The optional event_loop argument allows explicitly setting the event
+        loop object used by the future. If it's not provided, the future uses
+        the default event loop.
+        """
+        if loop is None:
+            self._loop = events._get_event_loop()
+        else:
+            self._loop = loop
+        self._callbacks = []
+        if self._loop.get_debug():
+            self._source_traceback = format_helpers.extract_stack(
+                sys._getframe(1))
+
+    _repr_info = base_futures._future_repr_info
+
+    def __repr__(self):
+        return '<{} {}>'.format(self.__class__.__name__,
+                                ' '.join(self._repr_info()))
+
+    def __del__(self):
+        if not self.__log_traceback:
+            # set_exception() was not called, or result() or exception()
+            # has consumed the exception
+            return
+        exc = self._exception
+        context = {
+            'message':
+                f'{self.__class__.__name__} exception was never retrieved',
+            'exception': exc,
+            'future': self,
+        }
+        if self._source_traceback:
+            context['source_traceback'] = self._source_traceback
+        self._loop.call_exception_handler(context)
+
+    __class_getitem__ = classmethod(GenericAlias)
+
+    @property
+    def _log_traceback(self):
+        return self.__log_traceback
+
+    @_log_traceback.setter
+    def _log_traceback(self, val):
+        if val:
+            raise ValueError('_log_traceback can only be set to False')
+        self.__log_traceback = False
+
+    def get_loop(self):
+        """Return the event loop the Future is bound to."""
+        loop = self._loop
+        if loop is None:
+            raise RuntimeError("Future object is not initialized.")
+        return loop
+
+    def _make_cancelled_error(self):
+        """Create the CancelledError to raise if the Future is cancelled.
+
+        This should only be called once when handling a cancellation since
+        it erases the saved context exception value.
+        """
+        if self._cancel_message is None:
+            exc = exceptions.CancelledError()
+        else:
+            exc = exceptions.CancelledError(self._cancel_message)
+        exc.__context__ = self._cancelled_exc
+        # Remove the reference since we don't need this anymore.
+        self._cancelled_exc = None
+        return exc
+
+    def cancel(self, msg=None):
+        """Cancel the future and schedule callbacks.
+
+        If the future is already done or cancelled, return False.  Otherwise,
+        change the future's state to cancelled, schedule the callbacks and
+        return True.
+        """
+        self.__log_traceback = False
+        if self._state != _PENDING:
+            return False
+        self._state = _CANCELLED
+        self._cancel_message = msg
+        self.__schedule_callbacks()
+        return True
+
+    def __schedule_callbacks(self):
+        """Internal: Ask the event loop to call all callbacks.
+
+        The callbacks are scheduled to be called as soon as possible. Also
+        clears the callback list.
+        """
+        callbacks = self._callbacks[:]
+        if not callbacks:
+            return
+
+        self._callbacks[:] = []
+        for callback, ctx in callbacks:
+            self._loop.call_soon(callback, self, context=ctx)
+
+    def cancelled(self):
+        """Return True if the future was cancelled."""
+        return self._state == _CANCELLED
+
+    # Don't implement running(); see http://bugs.python.org/issue18699
+
+    def done(self):
+        """Return True if the future is done.
+
+        Done means either that a result / exception are available, or that the
+        future was cancelled.
+        """
+        return self._state != _PENDING
+
+    def result(self):
+        """Return the result this future represents.
+
+        If the future has been cancelled, raises CancelledError.  If the
+        future's result isn't yet available, raises InvalidStateError.  If
+        the future is done and has an exception set, this exception is raised.
+        """
+        if self._state == _CANCELLED:
+            exc = self._make_cancelled_error()
+            raise exc
+        if self._state != _FINISHED:
+            raise exceptions.InvalidStateError('Result is not ready.')
+        self.__log_traceback = False
+        if self._exception is not None:
+            raise self._exception.with_traceback(self._exception_tb)
+        return self._result
+
+    def exception(self):
+        """Return the exception that was set on this future.
+
+        The exception (or None if no exception was set) is returned only if
+        the future is done.  If the future has been cancelled, raises
+        CancelledError.  If the future isn't done yet, raises
+        InvalidStateError.
+        """
+        if self._state == _CANCELLED:
+            exc = self._make_cancelled_error()
+            raise exc
+        if self._state != _FINISHED:
+            raise exceptions.InvalidStateError('Exception is not set.')
+        self.__log_traceback = False
+        return self._exception
+
+    def add_done_callback(self, fn, *, context=None):
+        """Add a callback to be run when the future becomes done.
+
+        The callback is called with a single argument - the future object. If
+        the future is already done when this is called, the callback is
+        scheduled with call_soon.
+        """
+        if self._state != _PENDING:
+            self._loop.call_soon(fn, self, context=context)
+        else:
+            if context is None:
+                context = contextvars.copy_context()
+            self._callbacks.append((fn, context))
+
+    # New method not in PEP 3148.
+
+    def remove_done_callback(self, fn):
+        """Remove all instances of a callback from the "call when done" list.
+
+        Returns the number of callbacks removed.
+        """
+        filtered_callbacks = [(f, ctx)
+                              for (f, ctx) in self._callbacks
+                              if f != fn]
+        removed_count = len(self._callbacks) - len(filtered_callbacks)
+        if removed_count:
+            self._callbacks[:] = filtered_callbacks
+        return removed_count
+
+    # So-called internal methods (note: no set_running_or_notify_cancel()).
+
+    def set_result(self, result):
+        """Mark the future done and set its result.
+
+        If the future is already done when this method is called, raises
+        InvalidStateError.
+        """
+        if self._state != _PENDING:
+            raise exceptions.InvalidStateError(f'{self._state}: {self!r}')
+        self._result = result
+        self._state = _FINISHED
+        self.__schedule_callbacks()
+
+    def set_exception(self, exception):
+        """Mark the future done and set an exception.
+
+        If the future is already done when this method is called, raises
+        InvalidStateError.
+        """
+        if self._state != _PENDING:
+            raise exceptions.InvalidStateError(f'{self._state}: {self!r}')
+        if isinstance(exception, type):
+            exception = exception()
+        if type(exception) is StopIteration:
+            raise TypeError("StopIteration interacts badly with generators "
+                            "and cannot be raised into a Future")
+        self._exception = exception
+        self._exception_tb = exception.__traceback__
+        self._state = _FINISHED
+        self.__schedule_callbacks()
+        self.__log_traceback = True
+
+    def __await__(self):
+        if not self.done():
+            self._asyncio_future_blocking = True
+            yield self  # This tells Task to wait for completion.
+        if not self.done():
+            raise RuntimeError("await wasn't used with future")
+        return self.result()  # May raise too.
+
+    __iter__ = __await__  # make compatible with 'yield from'.
+
+
+# Needed for testing purposes.
+_PyFuture = Future
+
+
+def _get_loop(fut):
+    # Tries to call Future.get_loop() if it's available.
+    # Otherwise fallbacks to using the old '_loop' property.
+    try:
+        get_loop = fut.get_loop
+    except AttributeError:
+        pass
+    else:
+        return get_loop()
+    return fut._loop
+
+
+def _set_result_unless_cancelled(fut, result):
+    """Helper setting the result only if the future was not cancelled."""
+    if fut.cancelled():
+        return
+    fut.set_result(result)
+
+
+def _convert_future_exc(exc):
+    exc_class = type(exc)
+    if exc_class is concurrent.futures.CancelledError:
+        return exceptions.CancelledError(*exc.args)
+    elif exc_class is concurrent.futures.TimeoutError:
+        return exceptions.TimeoutError(*exc.args)
+    elif exc_class is concurrent.futures.InvalidStateError:
+        return exceptions.InvalidStateError(*exc.args)
+    else:
+        return exc
+
+
+def _set_concurrent_future_state(concurrent, source):
+    """Copy state from a future to a concurrent.futures.Future."""
+    assert source.done()
+    if source.cancelled():
+        concurrent.cancel()
+    if not concurrent.set_running_or_notify_cancel():
+        return
+    exception = source.exception()
+    if exception is not None:
+        concurrent.set_exception(_convert_future_exc(exception))
+    else:
+        result = source.result()
+        concurrent.set_result(result)
+
+
+def _copy_future_state(source, dest):
+    """Internal helper to copy state from another Future.
+
+    The other Future may be a concurrent.futures.Future.
+    """
+    assert source.done()
+    if dest.cancelled():
+        return
+    assert not dest.done()
+    if source.cancelled():
+        dest.cancel()
+    else:
+        exception = source.exception()
+        if exception is not None:
+            dest.set_exception(_convert_future_exc(exception))
+        else:
+            result = source.result()
+            dest.set_result(result)
+
+
+def _chain_future(source, destination):
+    """Chain two futures so that when one completes, so does the other.
+
+    The result (or exception) of source will be copied to destination.
+    If destination is cancelled, source gets cancelled too.
+    Compatible with both asyncio.Future and concurrent.futures.Future.
+    """
+    if not isfuture(source) and not isinstance(source,
+                                               concurrent.futures.Future):
+        raise TypeError('A future is required for source argument')
+    if not isfuture(destination) and not isinstance(destination,
+                                                    concurrent.futures.Future):
+        raise TypeError('A future is required for destination argument')
+    source_loop = _get_loop(source) if isfuture(source) else None
+    dest_loop = _get_loop(destination) if isfuture(destination) else None
+
+    def _set_state(future, other):
+        if isfuture(future):
+            _copy_future_state(other, future)
+        else:
+            _set_concurrent_future_state(future, other)
+
+    def _call_check_cancel(destination):
+        if destination.cancelled():
+            if source_loop is None or source_loop is dest_loop:
+                source.cancel()
+            else:
+                source_loop.call_soon_threadsafe(source.cancel)
+
+    def _call_set_state(source):
+        if (destination.cancelled() and
+                dest_loop is not None and dest_loop.is_closed()):
+            return
+        if dest_loop is None or dest_loop is source_loop:
+            _set_state(destination, source)
+        else:
+            if dest_loop.is_closed():
+                return
+            dest_loop.call_soon_threadsafe(_set_state, destination, source)
+
+    destination.add_done_callback(_call_check_cancel)
+    source.add_done_callback(_call_set_state)
+
+
+def wrap_future(future, *, loop=None):
+    """Wrap concurrent.futures.Future object."""
+    if isfuture(future):
+        return future
+    assert isinstance(future, concurrent.futures.Future), \
+        f'concurrent.futures.Future is expected, got {future!r}'
+    if loop is None:
+        loop = events._get_event_loop()
+    new_future = loop.create_future()
+    _chain_future(future, new_future)
+    return new_future
+
+
+try:
+    import _asyncio
+except ImportError:
+    pass
+else:
+    # _CFuture is needed for tests.
+    Future = _CFuture = _asyncio.Future

janus/lib/python3.10/asyncio/locks.py

@@ -0,0 +1,438 @@
+"""Synchronization primitives."""
+
+__all__ = ('Lock', 'Event', 'Condition', 'Semaphore', 'BoundedSemaphore')
+
+import collections
+
+from . import exceptions
+from . import mixins
+from . import tasks
+
+
+class _ContextManagerMixin:
+    async def __aenter__(self):
+        await self.acquire()
+        # We have no use for the "as ..."  clause in the with
+        # statement for locks.
+        return None
+
+    async def __aexit__(self, exc_type, exc, tb):
+        self.release()
+
+
+class Lock(_ContextManagerMixin, mixins._LoopBoundMixin):
+    """Primitive lock objects.
+
+    A primitive lock is a synchronization primitive that is not owned
+    by a particular coroutine when locked.  A primitive lock is in one
+    of two states, 'locked' or 'unlocked'.
+
+    It is created in the unlocked state.  It has two basic methods,
+    acquire() and release().  When the state is unlocked, acquire()
+    changes the state to locked and returns immediately.  When the
+    state is locked, acquire() blocks until a call to release() in
+    another coroutine changes it to unlocked, then the acquire() call
+    resets it to locked and returns.  The release() method should only
+    be called in the locked state; it changes the state to unlocked
+    and returns immediately.  If an attempt is made to release an
+    unlocked lock, a RuntimeError will be raised.
+
+    When more than one coroutine is blocked in acquire() waiting for
+    the state to turn to unlocked, only one coroutine proceeds when a
+    release() call resets the state to unlocked; first coroutine which
+    is blocked in acquire() is being processed.
+
+    acquire() is a coroutine and should be called with 'await'.
+
+    Locks also support the asynchronous context management protocol.
+    'async with lock' statement should be used.
+
+    Usage:
+
+        lock = Lock()
+        ...
+        await lock.acquire()
+        try:
+            ...
+        finally:
+            lock.release()
+
+    Context manager usage:
+
+        lock = Lock()
+        ...
+        async with lock:
+             ...
+
+    Lock objects can be tested for locking state:
+
+        if not lock.locked():
+           await lock.acquire()
+        else:
+           # lock is acquired
+           ...
+
+    """
+
+    def __init__(self, *, loop=mixins._marker):
+        super().__init__(loop=loop)
+        self._waiters = None
+        self._locked = False
+
+    def __repr__(self):
+        res = super().__repr__()
+        extra = 'locked' if self._locked else 'unlocked'
+        if self._waiters:
+            extra = f'{extra}, waiters:{len(self._waiters)}'
+        return f'<{res[1:-1]} [{extra}]>'
+
+    def locked(self):
+        """Return True if lock is acquired."""
+        return self._locked
+
+    async def acquire(self):
+        """Acquire a lock.
+
+        This method blocks until the lock is unlocked, then sets it to
+        locked and returns True.
+        """
+        if (not self._locked and (self._waiters is None or
+                all(w.cancelled() for w in self._waiters))):
+            self._locked = True
+            return True
+
+        if self._waiters is None:
+            self._waiters = collections.deque()
+        fut = self._get_loop().create_future()
+        self._waiters.append(fut)
+
+        # Finally block should be called before the CancelledError
+        # handling as we don't want CancelledError to call
+        # _wake_up_first() and attempt to wake up itself.
+        try:
+            try:
+                await fut
+            finally:
+                self._waiters.remove(fut)
+        except exceptions.CancelledError:
+            if not self._locked:
+                self._wake_up_first()
+            raise
+
+        self._locked = True
+        return True
+
+    def release(self):
+        """Release a lock.
+
+        When the lock is locked, reset it to unlocked, and return.
+        If any other coroutines are blocked waiting for the lock to become
+        unlocked, allow exactly one of them to proceed.
+
+        When invoked on an unlocked lock, a RuntimeError is raised.
+
+        There is no return value.
+        """
+        if self._locked:
+            self._locked = False
+            self._wake_up_first()
+        else:
+            raise RuntimeError('Lock is not acquired.')
+
+    def _wake_up_first(self):
+        """Wake up the first waiter if it isn't done."""
+        if not self._waiters:
+            return
+        try:
+            fut = next(iter(self._waiters))
+        except StopIteration:
+            return
+
+        # .done() necessarily means that a waiter will wake up later on and
+        # either take the lock, or, if it was cancelled and lock wasn't
+        # taken already, will hit this again and wake up a new waiter.
+        if not fut.done():
+            fut.set_result(True)
+
+
+class Event(mixins._LoopBoundMixin):
+    """Asynchronous equivalent to threading.Event.
+
+    Class implementing event objects. An event manages a flag that can be set
+    to true with the set() method and reset to false with the clear() method.
+    The wait() method blocks until the flag is true. The flag is initially
+    false.
+    """
+
+    def __init__(self, *, loop=mixins._marker):
+        super().__init__(loop=loop)
+        self._waiters = collections.deque()
+        self._value = False
+
+    def __repr__(self):
+        res = super().__repr__()
+        extra = 'set' if self._value else 'unset'
+        if self._waiters:
+            extra = f'{extra}, waiters:{len(self._waiters)}'
+        return f'<{res[1:-1]} [{extra}]>'
+
+    def is_set(self):
+        """Return True if and only if the internal flag is true."""
+        return self._value
+
+    def set(self):
+        """Set the internal flag to true. All coroutines waiting for it to
+        become true are awakened. Coroutine that call wait() once the flag is
+        true will not block at all.
+        """
+        if not self._value:
+            self._value = True
+
+            for fut in self._waiters:
+                if not fut.done():
+                    fut.set_result(True)
+
+    def clear(self):
+        """Reset the internal flag to false. Subsequently, coroutines calling
+        wait() will block until set() is called to set the internal flag
+        to true again."""
+        self._value = False
+
+    async def wait(self):
+        """Block until the internal flag is true.
+
+        If the internal flag is true on entry, return True
+        immediately.  Otherwise, block until another coroutine calls
+        set() to set the flag to true, then return True.
+        """
+        if self._value:
+            return True
+
+        fut = self._get_loop().create_future()
+        self._waiters.append(fut)
+        try:
+            await fut
+            return True
+        finally:
+            self._waiters.remove(fut)
+
+
+class Condition(_ContextManagerMixin, mixins._LoopBoundMixin):
+    """Asynchronous equivalent to threading.Condition.
+
+    This class implements condition variable objects. A condition variable
+    allows one or more coroutines to wait until they are notified by another
+    coroutine.
+
+    A new Lock object is created and used as the underlying lock.
+    """
+
+    def __init__(self, lock=None, *, loop=mixins._marker):
+        super().__init__(loop=loop)
+        if lock is None:
+            lock = Lock()
+
+        self._lock = lock
+        # Export the lock's locked(), acquire() and release() methods.
+        self.locked = lock.locked
+        self.acquire = lock.acquire
+        self.release = lock.release
+
+        self._waiters = collections.deque()
+
+    def __repr__(self):
+        res = super().__repr__()
+        extra = 'locked' if self.locked() else 'unlocked'
+        if self._waiters:
+            extra = f'{extra}, waiters:{len(self._waiters)}'
+        return f'<{res[1:-1]} [{extra}]>'
+
+    async def wait(self):
+        """Wait until notified.
+
+        If the calling coroutine has not acquired the lock when this
+        method is called, a RuntimeError is raised.
+
+        This method releases the underlying lock, and then blocks
+        until it is awakened by a notify() or notify_all() call for
+        the same condition variable in another coroutine.  Once
+        awakened, it re-acquires the lock and returns True.
+        """
+        if not self.locked():
+            raise RuntimeError('cannot wait on un-acquired lock')
+
+        self.release()
+        try:
+            fut = self._get_loop().create_future()
+            self._waiters.append(fut)
+            try:
+                await fut
+                return True
+            finally:
+                self._waiters.remove(fut)
+
+        finally:
+            # Must reacquire lock even if wait is cancelled
+            cancelled = False
+            while True:
+                try:
+                    await self.acquire()
+                    break
+                except exceptions.CancelledError:
+                    cancelled = True
+
+            if cancelled:
+                raise exceptions.CancelledError
+
+    async def wait_for(self, predicate):
+        """Wait until a predicate becomes true.
+
+        The predicate should be a callable which result will be
+        interpreted as a boolean value.  The final predicate value is
+        the return value.
+        """
+        result = predicate()
+        while not result:
+            await self.wait()
+            result = predicate()
+        return result
+
+    def notify(self, n=1):
+        """By default, wake up one coroutine waiting on this condition, if any.
+        If the calling coroutine has not acquired the lock when this method
+        is called, a RuntimeError is raised.
+
+        This method wakes up at most n of the coroutines waiting for the
+        condition variable; it is a no-op if no coroutines are waiting.
+
+        Note: an awakened coroutine does not actually return from its
+        wait() call until it can reacquire the lock. Since notify() does
+        not release the lock, its caller should.
+        """
+        if not self.locked():
+            raise RuntimeError('cannot notify on un-acquired lock')
+
+        idx = 0
+        for fut in self._waiters:
+            if idx >= n:
+                break
+
+            if not fut.done():
+                idx += 1
+                fut.set_result(False)
+
+    def notify_all(self):
+        """Wake up all threads waiting on this condition. This method acts
+        like notify(), but wakes up all waiting threads instead of one. If the
+        calling thread has not acquired the lock when this method is called,
+        a RuntimeError is raised.
+        """
+        self.notify(len(self._waiters))
+
+
+class Semaphore(_ContextManagerMixin, mixins._LoopBoundMixin):
+    """A Semaphore implementation.
+
+    A semaphore manages an internal counter which is decremented by each
+    acquire() call and incremented by each release() call. The counter
+    can never go below zero; when acquire() finds that it is zero, it blocks,
+    waiting until some other thread calls release().
+
+    Semaphores also support the context management protocol.
+
+    The optional argument gives the initial value for the internal
+    counter; it defaults to 1. If the value given is less than 0,
+    ValueError is raised.
+    """
+
+    def __init__(self, value=1, *, loop=mixins._marker):
+        super().__init__(loop=loop)
+        if value < 0:
+            raise ValueError("Semaphore initial value must be >= 0")
+        self._waiters = None
+        self._value = value
+
+    def __repr__(self):
+        res = super().__repr__()
+        extra = 'locked' if self.locked() else f'unlocked, value:{self._value}'
+        if self._waiters:
+            extra = f'{extra}, waiters:{len(self._waiters)}'
+        return f'<{res[1:-1]} [{extra}]>'
+
+    def locked(self):
+        """Returns True if semaphore cannot be acquired immediately."""
+        return self._value == 0 or (
+            any(not w.cancelled() for w in (self._waiters or ())))
+
+    async def acquire(self):
+        """Acquire a semaphore.
+
+        If the internal counter is larger than zero on entry,
+        decrement it by one and return True immediately.  If it is
+        zero on entry, block, waiting until some other coroutine has
+        called release() to make it larger than 0, and then return
+        True.
+        """
+        if not self.locked():
+            self._value -= 1
+            return True
+
+        if self._waiters is None:
+            self._waiters = collections.deque()
+        fut = self._get_loop().create_future()
+        self._waiters.append(fut)
+
+        # Finally block should be called before the CancelledError
+        # handling as we don't want CancelledError to call
+        # _wake_up_first() and attempt to wake up itself.
+        try:
+            try:
+                await fut
+            finally:
+                self._waiters.remove(fut)
+        except exceptions.CancelledError:
+            if not fut.cancelled():
+                self._value += 1
+                self._wake_up_next()
+            raise
+
+        if self._value > 0:
+            self._wake_up_next()
+        return True
+
+    def release(self):
+        """Release a semaphore, incrementing the internal counter by one.
+
+        When it was zero on entry and another coroutine is waiting for it to
+        become larger than zero again, wake up that coroutine.
+        """
+        self._value += 1
+        self._wake_up_next()
+
+    def _wake_up_next(self):
+        """Wake up the first waiter that isn't done."""
+        if not self._waiters:
+            return
+
+        for fut in self._waiters:
+            if not fut.done():
+                self._value -= 1
+                fut.set_result(True)
+                return
+
+
+class BoundedSemaphore(Semaphore):
+    """A bounded semaphore implementation.
+
+    This raises ValueError in release() if it would increase the value
+    above the initial value.
+    """
+
+    def __init__(self, value=1, *, loop=mixins._marker):
+        self._bound_value = value
+        super().__init__(value, loop=loop)
+
+    def release(self):
+        if self._value >= self._bound_value:
+            raise ValueError('BoundedSemaphore released too many times')
+        super().release()

janus/lib/python3.10/asyncio/mixins.py

@@ -0,0 +1,31 @@
+"""Event loop mixins."""
+
+import threading
+from . import events
+
+_global_lock = threading.Lock()
+
+# Used as a sentinel for loop parameter
+_marker = object()
+
+
+class _LoopBoundMixin:
+    _loop = None
+
+    def __init__(self, *, loop=_marker):
+        if loop is not _marker:
+            raise TypeError(
+                f'As of 3.10, the *loop* parameter was removed from '
+                f'{type(self).__name__}() since it is no longer necessary'
+            )
+
+    def _get_loop(self):
+        loop = events._get_running_loop()
+
+        if self._loop is None:
+            with _global_lock:
+                if self._loop is None:
+                    self._loop = loop
+        if loop is not self._loop:
+            raise RuntimeError(f'{self!r} is bound to a different event loop')
+        return loop

janus/lib/python3.10/asyncio/protocols.py

@@ -0,0 +1,216 @@
+"""Abstract Protocol base classes."""
+
+__all__ = (
+    'BaseProtocol', 'Protocol', 'DatagramProtocol',
+    'SubprocessProtocol', 'BufferedProtocol',
+)
+
+
+class BaseProtocol:
+    """Common base class for protocol interfaces.
+
+    Usually user implements protocols that derived from BaseProtocol
+    like Protocol or ProcessProtocol.
+
+    The only case when BaseProtocol should be implemented directly is
+    write-only transport like write pipe
+    """
+
+    __slots__ = ()
+
+    def connection_made(self, transport):
+        """Called when a connection is made.
+
+        The argument is the transport representing the pipe connection.
+        To receive data, wait for data_received() calls.
+        When the connection is closed, connection_lost() is called.
+        """
+
+    def connection_lost(self, exc):
+        """Called when the connection is lost or closed.
+
+        The argument is an exception object or None (the latter
+        meaning a regular EOF is received or the connection was
+        aborted or closed).
+        """
+
+    def pause_writing(self):
+        """Called when the transport's buffer goes over the high-water mark.
+
+        Pause and resume calls are paired -- pause_writing() is called
+        once when the buffer goes strictly over the high-water mark
+        (even if subsequent writes increases the buffer size even
+        more), and eventually resume_writing() is called once when the
+        buffer size reaches the low-water mark.
+
+        Note that if the buffer size equals the high-water mark,
+        pause_writing() is not called -- it must go strictly over.
+        Conversely, resume_writing() is called when the buffer size is
+        equal or lower than the low-water mark.  These end conditions
+        are important to ensure that things go as expected when either
+        mark is zero.
+
+        NOTE: This is the only Protocol callback that is not called
+        through EventLoop.call_soon() -- if it were, it would have no
+        effect when it's most needed (when the app keeps writing
+        without yielding until pause_writing() is called).
+        """
+
+    def resume_writing(self):
+        """Called when the transport's buffer drains below the low-water mark.
+
+        See pause_writing() for details.
+        """
+
+
+class Protocol(BaseProtocol):
+    """Interface for stream protocol.
+
+    The user should implement this interface.  They can inherit from
+    this class but don't need to.  The implementations here do
+    nothing (they don't raise exceptions).
+
+    When the user wants to requests a transport, they pass a protocol
+    factory to a utility function (e.g., EventLoop.create_connection()).
+
+    When the connection is made successfully, connection_made() is
+    called with a suitable transport object.  Then data_received()
+    will be called 0 or more times with data (bytes) received from the
+    transport; finally, connection_lost() will be called exactly once
+    with either an exception object or None as an argument.
+
+    State machine of calls:
+
+      start -> CM [-> DR*] [-> ER?] -> CL -> end
+
+    * CM: connection_made()
+    * DR: data_received()
+    * ER: eof_received()
+    * CL: connection_lost()
+    """
+
+    __slots__ = ()
+
+    def data_received(self, data):
+        """Called when some data is received.
+
+        The argument is a bytes object.
+        """
+
+    def eof_received(self):
+        """Called when the other end calls write_eof() or equivalent.
+
+        If this returns a false value (including None), the transport
+        will close itself.  If it returns a true value, closing the
+        transport is up to the protocol.
+        """
+
+
+class BufferedProtocol(BaseProtocol):
+    """Interface for stream protocol with manual buffer control.
+
+    Event methods, such as `create_server` and `create_connection`,
+    accept factories that return protocols that implement this interface.
+
+    The idea of BufferedProtocol is that it allows to manually allocate
+    and control the receive buffer.  Event loops can then use the buffer
+    provided by the protocol to avoid unnecessary data copies.  This
+    can result in noticeable performance improvement for protocols that
+    receive big amounts of data.  Sophisticated protocols can allocate
+    the buffer only once at creation time.
+
+    State machine of calls:
+
+      start -> CM [-> GB [-> BU?]]* [-> ER?] -> CL -> end
+
+    * CM: connection_made()
+    * GB: get_buffer()
+    * BU: buffer_updated()
+    * ER: eof_received()
+    * CL: connection_lost()
+    """
+
+    __slots__ = ()
+
+    def get_buffer(self, sizehint):
+        """Called to allocate a new receive buffer.
+
+        *sizehint* is a recommended minimal size for the returned
+        buffer.  When set to -1, the buffer size can be arbitrary.
+
+        Must return an object that implements the
+        :ref:`buffer protocol <bufferobjects>`.
+        It is an error to return a zero-sized buffer.
+        """
+
+    def buffer_updated(self, nbytes):
+        """Called when the buffer was updated with the received data.
+
+        *nbytes* is the total number of bytes that were written to
+        the buffer.
+        """
+
+    def eof_received(self):
+        """Called when the other end calls write_eof() or equivalent.
+
+        If this returns a false value (including None), the transport
+        will close itself.  If it returns a true value, closing the
+        transport is up to the protocol.
+        """
+
+
+class DatagramProtocol(BaseProtocol):
+    """Interface for datagram protocol."""
+
+    __slots__ = ()
+
+    def datagram_received(self, data, addr):
+        """Called when some datagram is received."""
+
+    def error_received(self, exc):
+        """Called when a send or receive operation raises an OSError.
+
+        (Other than BlockingIOError or InterruptedError.)
+        """
+
+
+class SubprocessProtocol(BaseProtocol):
+    """Interface for protocol for subprocess calls."""
+
+    __slots__ = ()
+
+    def pipe_data_received(self, fd, data):
+        """Called when the subprocess writes data into stdout/stderr pipe.
+
+        fd is int file descriptor.
+        data is bytes object.
+        """
+
+    def pipe_connection_lost(self, fd, exc):
+        """Called when a file descriptor associated with the child process is
+        closed.
+
+        fd is the int file descriptor that was closed.
+        """
+
+    def process_exited(self):
+        """Called when subprocess has exited."""
+
+
+def _feed_data_to_buffered_proto(proto, data):
+    data_len = len(data)
+    while data_len:
+        buf = proto.get_buffer(data_len)
+        buf_len = len(buf)
+        if not buf_len:
+            raise RuntimeError('get_buffer() returned an empty buffer')
+
+        if buf_len >= data_len:
+            buf[:data_len] = data
+            proto.buffer_updated(data_len)
+            return
+        else:
+            buf[:buf_len] = data[:buf_len]
+            proto.buffer_updated(buf_len)
+            data = data[buf_len:]
+            data_len = len(data)

janus/lib/python3.10/asyncio/selector_events.py

@@ -0,0 +1,1105 @@
+"""Event loop using a selector and related classes.
+
+A selector is a "notify-when-ready" multiplexer.  For a subclass which
+also includes support for signal handling, see the unix_events sub-module.
+"""
+
+__all__ = 'BaseSelectorEventLoop',
+
+import collections
+import errno
+import functools
+import selectors
+import socket
+import warnings
+import weakref
+try:
+    import ssl
+except ImportError:  # pragma: no cover
+    ssl = None
+
+from . import base_events
+from . import constants
+from . import events
+from . import futures
+from . import protocols
+from . import sslproto
+from . import transports
+from . import trsock
+from .log import logger
+
+
+def _test_selector_event(selector, fd, event):
+    # Test if the selector is monitoring 'event' events
+    # for the file descriptor 'fd'.
+    try:
+        key = selector.get_key(fd)
+    except KeyError:
+        return False
+    else:
+        return bool(key.events & event)
+
+
+class BaseSelectorEventLoop(base_events.BaseEventLoop):
+    """Selector event loop.
+
+    See events.EventLoop for API specification.
+    """
+
+    def __init__(self, selector=None):
+        super().__init__()
+
+        if selector is None:
+            selector = selectors.DefaultSelector()
+        logger.debug('Using selector: %s', selector.__class__.__name__)
+        self._selector = selector
+        self._make_self_pipe()
+        self._transports = weakref.WeakValueDictionary()
+
+    def _make_socket_transport(self, sock, protocol, waiter=None, *,
+                               extra=None, server=None):
+        return _SelectorSocketTransport(self, sock, protocol, waiter,
+                                        extra, server)
+
+    def _make_ssl_transport(
+            self, rawsock, protocol, sslcontext, waiter=None,
+            *, server_side=False, server_hostname=None,
+            extra=None, server=None,
+            ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT):
+        ssl_protocol = sslproto.SSLProtocol(
+                self, protocol, sslcontext, waiter,
+                server_side, server_hostname,
+                ssl_handshake_timeout=ssl_handshake_timeout)
+        _SelectorSocketTransport(self, rawsock, ssl_protocol,
+                                 extra=extra, server=server)
+        return ssl_protocol._app_transport
+
+    def _make_datagram_transport(self, sock, protocol,
+                                 address=None, waiter=None, extra=None):
+        return _SelectorDatagramTransport(self, sock, protocol,
+                                          address, waiter, extra)
+
+    def close(self):
+        if self.is_running():
+            raise RuntimeError("Cannot close a running event loop")
+        if self.is_closed():
+            return
+        self._close_self_pipe()
+        super().close()
+        if self._selector is not None:
+            self._selector.close()
+            self._selector = None
+
+    def _close_self_pipe(self):
+        self._remove_reader(self._ssock.fileno())
+        self._ssock.close()
+        self._ssock = None
+        self._csock.close()
+        self._csock = None
+        self._internal_fds -= 1
+
+    def _make_self_pipe(self):
+        # A self-socket, really. :-)
+        self._ssock, self._csock = socket.socketpair()
+        self._ssock.setblocking(False)
+        self._csock.setblocking(False)
+        self._internal_fds += 1
+        self._add_reader(self._ssock.fileno(), self._read_from_self)
+
+    def _process_self_data(self, data):
+        pass
+
+    def _read_from_self(self):
+        while True:
+            try:
+                data = self._ssock.recv(4096)
+                if not data:
+                    break
+                self._process_self_data(data)
+            except InterruptedError:
+                continue
+            except BlockingIOError:
+                break
+
+    def _write_to_self(self):
+        # This may be called from a different thread, possibly after
+        # _close_self_pipe() has been called or even while it is
+        # running.  Guard for self._csock being None or closed.  When
+        # a socket is closed, send() raises OSError (with errno set to
+        # EBADF, but let's not rely on the exact error code).
+        csock = self._csock
+        if csock is None:
+            return
+
+        try:
+            csock.send(b'\0')
+        except OSError:
+            if self._debug:
+                logger.debug("Fail to write a null byte into the "
+                             "self-pipe socket",
+                             exc_info=True)
+
+    def _start_serving(self, protocol_factory, sock,
+                       sslcontext=None, server=None, backlog=100,
+                       ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT):
+        self._add_reader(sock.fileno(), self._accept_connection,
+                         protocol_factory, sock, sslcontext, server, backlog,
+                         ssl_handshake_timeout)
+
+    def _accept_connection(
+            self, protocol_factory, sock,
+            sslcontext=None, server=None, backlog=100,
+            ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT):
+        # This method is only called once for each event loop tick where the
+        # listening socket has triggered an EVENT_READ. There may be multiple
+        # connections waiting for an .accept() so it is called in a loop.
+        # See https://bugs.python.org/issue27906 for more details.
+        for _ in range(backlog):
+            try:
+                conn, addr = sock.accept()
+                if self._debug:
+                    logger.debug("%r got a new connection from %r: %r",
+                                 server, addr, conn)
+                conn.setblocking(False)
+            except (BlockingIOError, InterruptedError, ConnectionAbortedError):
+                # Early exit because the socket accept buffer is empty.
+                return None
+            except OSError as exc:
+                # There's nowhere to send the error, so just log it.
+                if exc.errno in (errno.EMFILE, errno.ENFILE,
+                                 errno.ENOBUFS, errno.ENOMEM):
+                    # Some platforms (e.g. Linux keep reporting the FD as
+                    # ready, so we remove the read handler temporarily.
+                    # We'll try again in a while.
+                    self.call_exception_handler({
+                        'message': 'socket.accept() out of system resource',
+                        'exception': exc,
+                        'socket': trsock.TransportSocket(sock),
+                    })
+                    self._remove_reader(sock.fileno())
+                    self.call_later(constants.ACCEPT_RETRY_DELAY,
+                                    self._start_serving,
+                                    protocol_factory, sock, sslcontext, server,
+                                    backlog, ssl_handshake_timeout)
+                else:
+                    raise  # The event loop will catch, log and ignore it.
+            else:
+                extra = {'peername': addr}
+                accept = self._accept_connection2(
+                    protocol_factory, conn, extra, sslcontext, server,
+                    ssl_handshake_timeout)
+                self.create_task(accept)
+
+    async def _accept_connection2(
+            self, protocol_factory, conn, extra,
+            sslcontext=None, server=None,
+            ssl_handshake_timeout=constants.SSL_HANDSHAKE_TIMEOUT):
+        protocol = None
+        transport = None
+        try:
+            protocol = protocol_factory()
+            waiter = self.create_future()
+            if sslcontext:
+                transport = self._make_ssl_transport(
+                    conn, protocol, sslcontext, waiter=waiter,
+                    server_side=True, extra=extra, server=server,
+                    ssl_handshake_timeout=ssl_handshake_timeout)
+            else:
+                transport = self._make_socket_transport(
+                    conn, protocol, waiter=waiter, extra=extra,
+                    server=server)
+
+            try:
+                await waiter
+            except BaseException:
+                transport.close()
+                raise
+                # It's now up to the protocol to handle the connection.
+
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            if self._debug:
+                context = {
+                    'message':
+                        'Error on transport creation for incoming connection',
+                    'exception': exc,
+                }
+                if protocol is not None:
+                    context['protocol'] = protocol
+                if transport is not None:
+                    context['transport'] = transport
+                self.call_exception_handler(context)
+
+    def _ensure_fd_no_transport(self, fd):
+        fileno = fd
+        if not isinstance(fileno, int):
+            try:
+                fileno = int(fileno.fileno())
+            except (AttributeError, TypeError, ValueError):
+                # This code matches selectors._fileobj_to_fd function.
+                raise ValueError(f"Invalid file object: {fd!r}") from None
+        try:
+            transport = self._transports[fileno]
+        except KeyError:
+            pass
+        else:
+            if not transport.is_closing():
+                raise RuntimeError(
+                    f'File descriptor {fd!r} is used by transport '
+                    f'{transport!r}')
+
+    def _add_reader(self, fd, callback, *args):
+        self._check_closed()
+        handle = events.Handle(callback, args, self, None)
+        try:
+            key = self._selector.get_key(fd)
+        except KeyError:
+            self._selector.register(fd, selectors.EVENT_READ,
+                                    (handle, None))
+        else:
+            mask, (reader, writer) = key.events, key.data
+            self._selector.modify(fd, mask | selectors.EVENT_READ,
+                                  (handle, writer))
+            if reader is not None:
+                reader.cancel()
+        return handle
+
+    def _remove_reader(self, fd):
+        if self.is_closed():
+            return False
+        try:
+            key = self._selector.get_key(fd)
+        except KeyError:
+            return False
+        else:
+            mask, (reader, writer) = key.events, key.data
+            mask &= ~selectors.EVENT_READ
+            if not mask:
+                self._selector.unregister(fd)
+            else:
+                self._selector.modify(fd, mask, (None, writer))
+
+            if reader is not None:
+                reader.cancel()
+                return True
+            else:
+                return False
+
+    def _add_writer(self, fd, callback, *args):
+        self._check_closed()
+        handle = events.Handle(callback, args, self, None)
+        try:
+            key = self._selector.get_key(fd)
+        except KeyError:
+            self._selector.register(fd, selectors.EVENT_WRITE,
+                                    (None, handle))
+        else:
+            mask, (reader, writer) = key.events, key.data
+            self._selector.modify(fd, mask | selectors.EVENT_WRITE,
+                                  (reader, handle))
+            if writer is not None:
+                writer.cancel()
+        return handle
+
+    def _remove_writer(self, fd):
+        """Remove a writer callback."""
+        if self.is_closed():
+            return False
+        try:
+            key = self._selector.get_key(fd)
+        except KeyError:
+            return False
+        else:
+            mask, (reader, writer) = key.events, key.data
+            # Remove both writer and connector.
+            mask &= ~selectors.EVENT_WRITE
+            if not mask:
+                self._selector.unregister(fd)
+            else:
+                self._selector.modify(fd, mask, (reader, None))
+
+            if writer is not None:
+                writer.cancel()
+                return True
+            else:
+                return False
+
+    def add_reader(self, fd, callback, *args):
+        """Add a reader callback."""
+        self._ensure_fd_no_transport(fd)
+        self._add_reader(fd, callback, *args)
+
+    def remove_reader(self, fd):
+        """Remove a reader callback."""
+        self._ensure_fd_no_transport(fd)
+        return self._remove_reader(fd)
+
+    def add_writer(self, fd, callback, *args):
+        """Add a writer callback.."""
+        self._ensure_fd_no_transport(fd)
+        self._add_writer(fd, callback, *args)
+
+    def remove_writer(self, fd):
+        """Remove a writer callback."""
+        self._ensure_fd_no_transport(fd)
+        return self._remove_writer(fd)
+
+    async def sock_recv(self, sock, n):
+        """Receive data from the socket.
+
+        The return value is a bytes object representing the data received.
+        The maximum amount of data to be received at once is specified by
+        nbytes.
+        """
+        base_events._check_ssl_socket(sock)
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+        try:
+            return sock.recv(n)
+        except (BlockingIOError, InterruptedError):
+            pass
+        fut = self.create_future()
+        fd = sock.fileno()
+        self._ensure_fd_no_transport(fd)
+        handle = self._add_reader(fd, self._sock_recv, fut, sock, n)
+        fut.add_done_callback(
+            functools.partial(self._sock_read_done, fd, handle=handle))
+        return await fut
+
+    def _sock_read_done(self, fd, fut, handle=None):
+        if handle is None or not handle.cancelled():
+            self.remove_reader(fd)
+
+    def _sock_recv(self, fut, sock, n):
+        # _sock_recv() can add itself as an I/O callback if the operation can't
+        # be done immediately. Don't use it directly, call sock_recv().
+        if fut.done():
+            return
+        try:
+            data = sock.recv(n)
+        except (BlockingIOError, InterruptedError):
+            return  # try again next time
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+        else:
+            fut.set_result(data)
+
+    async def sock_recv_into(self, sock, buf):
+        """Receive data from the socket.
+
+        The received data is written into *buf* (a writable buffer).
+        The return value is the number of bytes written.
+        """
+        base_events._check_ssl_socket(sock)
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+        try:
+            return sock.recv_into(buf)
+        except (BlockingIOError, InterruptedError):
+            pass
+        fut = self.create_future()
+        fd = sock.fileno()
+        self._ensure_fd_no_transport(fd)
+        handle = self._add_reader(fd, self._sock_recv_into, fut, sock, buf)
+        fut.add_done_callback(
+            functools.partial(self._sock_read_done, fd, handle=handle))
+        return await fut
+
+    def _sock_recv_into(self, fut, sock, buf):
+        # _sock_recv_into() can add itself as an I/O callback if the operation
+        # can't be done immediately. Don't use it directly, call
+        # sock_recv_into().
+        if fut.done():
+            return
+        try:
+            nbytes = sock.recv_into(buf)
+        except (BlockingIOError, InterruptedError):
+            return  # try again next time
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+        else:
+            fut.set_result(nbytes)
+
+    async def sock_sendall(self, sock, data):
+        """Send data to the socket.
+
+        The socket must be connected to a remote socket. This method continues
+        to send data from data until either all data has been sent or an
+        error occurs. None is returned on success. On error, an exception is
+        raised, and there is no way to determine how much data, if any, was
+        successfully processed by the receiving end of the connection.
+        """
+        base_events._check_ssl_socket(sock)
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+        try:
+            n = sock.send(data)
+        except (BlockingIOError, InterruptedError):
+            n = 0
+
+        if n == len(data):
+            # all data sent
+            return
+
+        fut = self.create_future()
+        fd = sock.fileno()
+        self._ensure_fd_no_transport(fd)
+        # use a trick with a list in closure to store a mutable state
+        handle = self._add_writer(fd, self._sock_sendall, fut, sock,
+                                  memoryview(data), [n])
+        fut.add_done_callback(
+            functools.partial(self._sock_write_done, fd, handle=handle))
+        return await fut
+
+    def _sock_sendall(self, fut, sock, view, pos):
+        if fut.done():
+            # Future cancellation can be scheduled on previous loop iteration
+            return
+        start = pos[0]
+        try:
+            n = sock.send(view[start:])
+        except (BlockingIOError, InterruptedError):
+            return
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+            return
+
+        start += n
+
+        if start == len(view):
+            fut.set_result(None)
+        else:
+            pos[0] = start
+
+    async def sock_connect(self, sock, address):
+        """Connect to a remote socket at address.
+
+        This method is a coroutine.
+        """
+        base_events._check_ssl_socket(sock)
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+
+        if sock.family == socket.AF_INET or (
+                base_events._HAS_IPv6 and sock.family == socket.AF_INET6):
+            resolved = await self._ensure_resolved(
+                address, family=sock.family, type=sock.type, proto=sock.proto,
+                loop=self,
+            )
+            _, _, _, _, address = resolved[0]
+
+        fut = self.create_future()
+        self._sock_connect(fut, sock, address)
+        try:
+            return await fut
+        finally:
+            # Needed to break cycles when an exception occurs.
+            fut = None
+
+    def _sock_connect(self, fut, sock, address):
+        fd = sock.fileno()
+        try:
+            sock.connect(address)
+        except (BlockingIOError, InterruptedError):
+            # Issue #23618: When the C function connect() fails with EINTR, the
+            # connection runs in background. We have to wait until the socket
+            # becomes writable to be notified when the connection succeed or
+            # fails.
+            self._ensure_fd_no_transport(fd)
+            handle = self._add_writer(
+                fd, self._sock_connect_cb, fut, sock, address)
+            fut.add_done_callback(
+                functools.partial(self._sock_write_done, fd, handle=handle))
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+        else:
+            fut.set_result(None)
+        finally:
+            fut = None
+
+    def _sock_write_done(self, fd, fut, handle=None):
+        if handle is None or not handle.cancelled():
+            self.remove_writer(fd)
+
+    def _sock_connect_cb(self, fut, sock, address):
+        if fut.done():
+            return
+
+        try:
+            err = sock.getsockopt(socket.SOL_SOCKET, socket.SO_ERROR)
+            if err != 0:
+                # Jump to any except clause below.
+                raise OSError(err, f'Connect call failed {address}')
+        except (BlockingIOError, InterruptedError):
+            # socket is still registered, the callback will be retried later
+            pass
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+        else:
+            fut.set_result(None)
+        finally:
+            fut = None
+
+    async def sock_accept(self, sock):
+        """Accept a connection.
+
+        The socket must be bound to an address and listening for connections.
+        The return value is a pair (conn, address) where conn is a new socket
+        object usable to send and receive data on the connection, and address
+        is the address bound to the socket on the other end of the connection.
+        """
+        base_events._check_ssl_socket(sock)
+        if self._debug and sock.gettimeout() != 0:
+            raise ValueError("the socket must be non-blocking")
+        fut = self.create_future()
+        self._sock_accept(fut, sock)
+        return await fut
+
+    def _sock_accept(self, fut, sock):
+        fd = sock.fileno()
+        try:
+            conn, address = sock.accept()
+            conn.setblocking(False)
+        except (BlockingIOError, InterruptedError):
+            self._ensure_fd_no_transport(fd)
+            handle = self._add_reader(fd, self._sock_accept, fut, sock)
+            fut.add_done_callback(
+                functools.partial(self._sock_read_done, fd, handle=handle))
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            fut.set_exception(exc)
+        else:
+            fut.set_result((conn, address))
+
+    async def _sendfile_native(self, transp, file, offset, count):
+        del self._transports[transp._sock_fd]
+        resume_reading = transp.is_reading()
+        transp.pause_reading()
+        await transp._make_empty_waiter()
+        try:
+            return await self.sock_sendfile(transp._sock, file, offset, count,
+                                            fallback=False)
+        finally:
+            transp._reset_empty_waiter()
+            if resume_reading:
+                transp.resume_reading()
+            self._transports[transp._sock_fd] = transp
+
+    def _process_events(self, event_list):
+        for key, mask in event_list:
+            fileobj, (reader, writer) = key.fileobj, key.data
+            if mask & selectors.EVENT_READ and reader is not None:
+                if reader._cancelled:
+                    self._remove_reader(fileobj)
+                else:
+                    self._add_callback(reader)
+            if mask & selectors.EVENT_WRITE and writer is not None:
+                if writer._cancelled:
+                    self._remove_writer(fileobj)
+                else:
+                    self._add_callback(writer)
+
+    def _stop_serving(self, sock):
+        self._remove_reader(sock.fileno())
+        sock.close()
+
+
+class _SelectorTransport(transports._FlowControlMixin,
+                         transports.Transport):
+
+    max_size = 256 * 1024  # Buffer size passed to recv().
+
+    _buffer_factory = bytearray  # Constructs initial value for self._buffer.
+
+    # Attribute used in the destructor: it must be set even if the constructor
+    # is not called (see _SelectorSslTransport which may start by raising an
+    # exception)
+    _sock = None
+
+    def __init__(self, loop, sock, protocol, extra=None, server=None):
+        super().__init__(extra, loop)
+        self._extra['socket'] = trsock.TransportSocket(sock)
+        try:
+            self._extra['sockname'] = sock.getsockname()
+        except OSError:
+            self._extra['sockname'] = None
+        if 'peername' not in self._extra:
+            try:
+                self._extra['peername'] = sock.getpeername()
+            except socket.error:
+                self._extra['peername'] = None
+        self._sock = sock
+        self._sock_fd = sock.fileno()
+
+        self._protocol_connected = False
+        self.set_protocol(protocol)
+
+        self._server = server
+        self._buffer = self._buffer_factory()
+        self._conn_lost = 0  # Set when call to connection_lost scheduled.
+        self._closing = False  # Set when close() called.
+        if self._server is not None:
+            self._server._attach()
+        loop._transports[self._sock_fd] = self
+
+    def __repr__(self):
+        info = [self.__class__.__name__]
+        if self._sock is None:
+            info.append('closed')
+        elif self._closing:
+            info.append('closing')
+        info.append(f'fd={self._sock_fd}')
+        # test if the transport was closed
+        if self._loop is not None and not self._loop.is_closed():
+            polling = _test_selector_event(self._loop._selector,
+                                           self._sock_fd, selectors.EVENT_READ)
+            if polling:
+                info.append('read=polling')
+            else:
+                info.append('read=idle')
+
+            polling = _test_selector_event(self._loop._selector,
+                                           self._sock_fd,
+                                           selectors.EVENT_WRITE)
+            if polling:
+                state = 'polling'
+            else:
+                state = 'idle'
+
+            bufsize = self.get_write_buffer_size()
+            info.append(f'write=<{state}, bufsize={bufsize}>')
+        return '<{}>'.format(' '.join(info))
+
+    def abort(self):
+        self._force_close(None)
+
+    def set_protocol(self, protocol):
+        self._protocol = protocol
+        self._protocol_connected = True
+
+    def get_protocol(self):
+        return self._protocol
+
+    def is_closing(self):
+        return self._closing
+
+    def close(self):
+        if self._closing:
+            return
+        self._closing = True
+        self._loop._remove_reader(self._sock_fd)
+        if not self._buffer:
+            self._conn_lost += 1
+            self._loop._remove_writer(self._sock_fd)
+            self._loop.call_soon(self._call_connection_lost, None)
+
+    def __del__(self, _warn=warnings.warn):
+        if self._sock is not None:
+            _warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
+            self._sock.close()
+
+    def _fatal_error(self, exc, message='Fatal error on transport'):
+        # Should be called from exception handler only.
+        if isinstance(exc, OSError):
+            if self._loop.get_debug():
+                logger.debug("%r: %s", self, message, exc_info=True)
+        else:
+            self._loop.call_exception_handler({
+                'message': message,
+                'exception': exc,
+                'transport': self,
+                'protocol': self._protocol,
+            })
+        self._force_close(exc)
+
+    def _force_close(self, exc):
+        if self._conn_lost:
+            return
+        if self._buffer:
+            self._buffer.clear()
+            self._loop._remove_writer(self._sock_fd)
+        if not self._closing:
+            self._closing = True
+            self._loop._remove_reader(self._sock_fd)
+        self._conn_lost += 1
+        self._loop.call_soon(self._call_connection_lost, exc)
+
+    def _call_connection_lost(self, exc):
+        try:
+            if self._protocol_connected:
+                self._protocol.connection_lost(exc)
+        finally:
+            self._sock.close()
+            self._sock = None
+            self._protocol = None
+            self._loop = None
+            server = self._server
+            if server is not None:
+                server._detach()
+                self._server = None
+
+    def get_write_buffer_size(self):
+        return len(self._buffer)
+
+    def _add_reader(self, fd, callback, *args):
+        if self._closing:
+            return
+
+        self._loop._add_reader(fd, callback, *args)
+
+
+class _SelectorSocketTransport(_SelectorTransport):
+
+    _start_tls_compatible = True
+    _sendfile_compatible = constants._SendfileMode.TRY_NATIVE
+
+    def __init__(self, loop, sock, protocol, waiter=None,
+                 extra=None, server=None):
+
+        self._read_ready_cb = None
+        super().__init__(loop, sock, protocol, extra, server)
+        self._eof = False
+        self._paused = False
+        self._empty_waiter = None
+
+        # Disable the Nagle algorithm -- small writes will be
+        # sent without waiting for the TCP ACK.  This generally
+        # decreases the latency (in some cases significantly.)
+        base_events._set_nodelay(self._sock)
+
+        self._loop.call_soon(self._protocol.connection_made, self)
+        # only start reading when connection_made() has been called
+        self._loop.call_soon(self._add_reader,
+                             self._sock_fd, self._read_ready)
+        if waiter is not None:
+            # only wake up the waiter when connection_made() has been called
+            self._loop.call_soon(futures._set_result_unless_cancelled,
+                                 waiter, None)
+
+    def set_protocol(self, protocol):
+        if isinstance(protocol, protocols.BufferedProtocol):
+            self._read_ready_cb = self._read_ready__get_buffer
+        else:
+            self._read_ready_cb = self._read_ready__data_received
+
+        super().set_protocol(protocol)
+
+    def is_reading(self):
+        return not self._paused and not self._closing
+
+    def pause_reading(self):
+        if self._closing or self._paused:
+            return
+        self._paused = True
+        self._loop._remove_reader(self._sock_fd)
+        if self._loop.get_debug():
+            logger.debug("%r pauses reading", self)
+
+    def resume_reading(self):
+        if self._closing or not self._paused:
+            return
+        self._paused = False
+        self._add_reader(self._sock_fd, self._read_ready)
+        if self._loop.get_debug():
+            logger.debug("%r resumes reading", self)
+
+    def _read_ready(self):
+        self._read_ready_cb()
+
+    def _read_ready__get_buffer(self):
+        if self._conn_lost:
+            return
+
+        try:
+            buf = self._protocol.get_buffer(-1)
+            if not len(buf):
+                raise RuntimeError('get_buffer() returned an empty buffer')
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(
+                exc, 'Fatal error: protocol.get_buffer() call failed.')
+            return
+
+        try:
+            nbytes = self._sock.recv_into(buf)
+        except (BlockingIOError, InterruptedError):
+            return
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(exc, 'Fatal read error on socket transport')
+            return
+
+        if not nbytes:
+            self._read_ready__on_eof()
+            return
+
+        try:
+            self._protocol.buffer_updated(nbytes)
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(
+                exc, 'Fatal error: protocol.buffer_updated() call failed.')
+
+    def _read_ready__data_received(self):
+        if self._conn_lost:
+            return
+        try:
+            data = self._sock.recv(self.max_size)
+        except (BlockingIOError, InterruptedError):
+            return
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(exc, 'Fatal read error on socket transport')
+            return
+
+        if not data:
+            self._read_ready__on_eof()
+            return
+
+        try:
+            self._protocol.data_received(data)
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(
+                exc, 'Fatal error: protocol.data_received() call failed.')
+
+    def _read_ready__on_eof(self):
+        if self._loop.get_debug():
+            logger.debug("%r received EOF", self)
+
+        try:
+            keep_open = self._protocol.eof_received()
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(
+                exc, 'Fatal error: protocol.eof_received() call failed.')
+            return
+
+        if keep_open:
+            # We're keeping the connection open so the
+            # protocol can write more, but we still can't
+            # receive more, so remove the reader callback.
+            self._loop._remove_reader(self._sock_fd)
+        else:
+            self.close()
+
+    def write(self, data):
+        if not isinstance(data, (bytes, bytearray, memoryview)):
+            raise TypeError(f'data argument must be a bytes-like object, '
+                            f'not {type(data).__name__!r}')
+        if self._eof:
+            raise RuntimeError('Cannot call write() after write_eof()')
+        if self._empty_waiter is not None:
+            raise RuntimeError('unable to write; sendfile is in progress')
+        if not data:
+            return
+
+        if self._conn_lost:
+            if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
+                logger.warning('socket.send() raised exception.')
+            self._conn_lost += 1
+            return
+
+        if not self._buffer:
+            # Optimization: try to send now.
+            try:
+                n = self._sock.send(data)
+            except (BlockingIOError, InterruptedError):
+                pass
+            except (SystemExit, KeyboardInterrupt):
+                raise
+            except BaseException as exc:
+                self._fatal_error(exc, 'Fatal write error on socket transport')
+                return
+            else:
+                data = data[n:]
+                if not data:
+                    return
+            # Not all was written; register write handler.
+            self._loop._add_writer(self._sock_fd, self._write_ready)
+
+        # Add it to the buffer.
+        self._buffer.extend(data)
+        self._maybe_pause_protocol()
+
+    def _write_ready(self):
+        assert self._buffer, 'Data should not be empty'
+
+        if self._conn_lost:
+            return
+        try:
+            n = self._sock.send(self._buffer)
+        except (BlockingIOError, InterruptedError):
+            pass
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._loop._remove_writer(self._sock_fd)
+            self._buffer.clear()
+            self._fatal_error(exc, 'Fatal write error on socket transport')
+            if self._empty_waiter is not None:
+                self._empty_waiter.set_exception(exc)
+        else:
+            if n:
+                del self._buffer[:n]
+            self._maybe_resume_protocol()  # May append to buffer.
+            if not self._buffer:
+                self._loop._remove_writer(self._sock_fd)
+                if self._empty_waiter is not None:
+                    self._empty_waiter.set_result(None)
+                if self._closing:
+                    self._call_connection_lost(None)
+                elif self._eof:
+                    self._sock.shutdown(socket.SHUT_WR)
+
+    def write_eof(self):
+        if self._closing or self._eof:
+            return
+        self._eof = True
+        if not self._buffer:
+            self._sock.shutdown(socket.SHUT_WR)
+
+    def can_write_eof(self):
+        return True
+
+    def _call_connection_lost(self, exc):
+        super()._call_connection_lost(exc)
+        if self._empty_waiter is not None:
+            self._empty_waiter.set_exception(
+                ConnectionError("Connection is closed by peer"))
+
+    def _make_empty_waiter(self):
+        if self._empty_waiter is not None:
+            raise RuntimeError("Empty waiter is already set")
+        self._empty_waiter = self._loop.create_future()
+        if not self._buffer:
+            self._empty_waiter.set_result(None)
+        return self._empty_waiter
+
+    def _reset_empty_waiter(self):
+        self._empty_waiter = None
+
+
+class _SelectorDatagramTransport(_SelectorTransport):
+
+    _buffer_factory = collections.deque
+
+    def __init__(self, loop, sock, protocol, address=None,
+                 waiter=None, extra=None):
+        super().__init__(loop, sock, protocol, extra)
+        self._address = address
+        self._loop.call_soon(self._protocol.connection_made, self)
+        # only start reading when connection_made() has been called
+        self._loop.call_soon(self._add_reader,
+                             self._sock_fd, self._read_ready)
+        if waiter is not None:
+            # only wake up the waiter when connection_made() has been called
+            self._loop.call_soon(futures._set_result_unless_cancelled,
+                                 waiter, None)
+
+    def get_write_buffer_size(self):
+        return sum(len(data) for data, _ in self._buffer)
+
+    def _read_ready(self):
+        if self._conn_lost:
+            return
+        try:
+            data, addr = self._sock.recvfrom(self.max_size)
+        except (BlockingIOError, InterruptedError):
+            pass
+        except OSError as exc:
+            self._protocol.error_received(exc)
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            self._fatal_error(exc, 'Fatal read error on datagram transport')
+        else:
+            self._protocol.datagram_received(data, addr)
+
+    def sendto(self, data, addr=None):
+        if not isinstance(data, (bytes, bytearray, memoryview)):
+            raise TypeError(f'data argument must be a bytes-like object, '
+                            f'not {type(data).__name__!r}')
+        if not data:
+            return
+
+        if self._address:
+            if addr not in (None, self._address):
+                raise ValueError(
+                    f'Invalid address: must be None or {self._address}')
+            addr = self._address
+
+        if self._conn_lost and self._address:
+            if self._conn_lost >= constants.LOG_THRESHOLD_FOR_CONNLOST_WRITES:
+                logger.warning('socket.send() raised exception.')
+            self._conn_lost += 1
+            return
+
+        if not self._buffer:
+            # Attempt to send it right away first.
+            try:
+                if self._extra['peername']:
+                    self._sock.send(data)
+                else:
+                    self._sock.sendto(data, addr)
+                return
+            except (BlockingIOError, InterruptedError):
+                self._loop._add_writer(self._sock_fd, self._sendto_ready)
+            except OSError as exc:
+                self._protocol.error_received(exc)
+                return
+            except (SystemExit, KeyboardInterrupt):
+                raise
+            except BaseException as exc:
+                self._fatal_error(
+                    exc, 'Fatal write error on datagram transport')
+                return
+
+        # Ensure that what we buffer is immutable.
+        self._buffer.append((bytes(data), addr))
+        self._maybe_pause_protocol()
+
+    def _sendto_ready(self):
+        while self._buffer:
+            data, addr = self._buffer.popleft()
+            try:
+                if self._extra['peername']:
+                    self._sock.send(data)
+                else:
+                    self._sock.sendto(data, addr)
+            except (BlockingIOError, InterruptedError):
+                self._buffer.appendleft((data, addr))  # Try again later.
+                break
+            except OSError as exc:
+                self._protocol.error_received(exc)
+                return
+            except (SystemExit, KeyboardInterrupt):
+                raise
+            except BaseException as exc:
+                self._fatal_error(
+                    exc, 'Fatal write error on datagram transport')
+                return
+
+        self._maybe_resume_protocol()  # May append to buffer.
+        if not self._buffer:
+            self._loop._remove_writer(self._sock_fd)
+            if self._closing:
+                self._call_connection_lost(None)

janus/lib/python3.10/asyncio/subprocess.py

@@ -0,0 +1,223 @@
+__all__ = 'create_subprocess_exec', 'create_subprocess_shell'
+
+import subprocess
+
+from . import events
+from . import protocols
+from . import streams
+from . import tasks
+from .log import logger
+
+
+PIPE = subprocess.PIPE
+STDOUT = subprocess.STDOUT
+DEVNULL = subprocess.DEVNULL
+
+
+class SubprocessStreamProtocol(streams.FlowControlMixin,
+                               protocols.SubprocessProtocol):
+    """Like StreamReaderProtocol, but for a subprocess."""
+
+    def __init__(self, limit, loop):
+        super().__init__(loop=loop)
+        self._limit = limit
+        self.stdin = self.stdout = self.stderr = None
+        self._transport = None
+        self._process_exited = False
+        self._pipe_fds = []
+        self._stdin_closed = self._loop.create_future()
+
+    def __repr__(self):
+        info = [self.__class__.__name__]
+        if self.stdin is not None:
+            info.append(f'stdin={self.stdin!r}')
+        if self.stdout is not None:
+            info.append(f'stdout={self.stdout!r}')
+        if self.stderr is not None:
+            info.append(f'stderr={self.stderr!r}')
+        return '<{}>'.format(' '.join(info))
+
+    def connection_made(self, transport):
+        self._transport = transport
+
+        stdout_transport = transport.get_pipe_transport(1)
+        if stdout_transport is not None:
+            self.stdout = streams.StreamReader(limit=self._limit,
+                                               loop=self._loop)
+            self.stdout.set_transport(stdout_transport)
+            self._pipe_fds.append(1)
+
+        stderr_transport = transport.get_pipe_transport(2)
+        if stderr_transport is not None:
+            self.stderr = streams.StreamReader(limit=self._limit,
+                                               loop=self._loop)
+            self.stderr.set_transport(stderr_transport)
+            self._pipe_fds.append(2)
+
+        stdin_transport = transport.get_pipe_transport(0)
+        if stdin_transport is not None:
+            self.stdin = streams.StreamWriter(stdin_transport,
+                                              protocol=self,
+                                              reader=None,
+                                              loop=self._loop)
+
+    def pipe_data_received(self, fd, data):
+        if fd == 1:
+            reader = self.stdout
+        elif fd == 2:
+            reader = self.stderr
+        else:
+            reader = None
+        if reader is not None:
+            reader.feed_data(data)
+
+    def pipe_connection_lost(self, fd, exc):
+        if fd == 0:
+            pipe = self.stdin
+            if pipe is not None:
+                pipe.close()
+            self.connection_lost(exc)
+            if exc is None:
+                self._stdin_closed.set_result(None)
+            else:
+                self._stdin_closed.set_exception(exc)
+            return
+        if fd == 1:
+            reader = self.stdout
+        elif fd == 2:
+            reader = self.stderr
+        else:
+            reader = None
+        if reader is not None:
+            if exc is None:
+                reader.feed_eof()
+            else:
+                reader.set_exception(exc)
+
+        if fd in self._pipe_fds:
+            self._pipe_fds.remove(fd)
+        self._maybe_close_transport()
+
+    def process_exited(self):
+        self._process_exited = True
+        self._maybe_close_transport()
+
+    def _maybe_close_transport(self):
+        if len(self._pipe_fds) == 0 and self._process_exited:
+            self._transport.close()
+            self._transport = None
+
+    def _get_close_waiter(self, stream):
+        if stream is self.stdin:
+            return self._stdin_closed
+
+
+class Process:
+    def __init__(self, transport, protocol, loop):
+        self._transport = transport
+        self._protocol = protocol
+        self._loop = loop
+        self.stdin = protocol.stdin
+        self.stdout = protocol.stdout
+        self.stderr = protocol.stderr
+        self.pid = transport.get_pid()
+
+    def __repr__(self):
+        return f'<{self.__class__.__name__} {self.pid}>'
+
+    @property
+    def returncode(self):
+        return self._transport.get_returncode()
+
+    async def wait(self):
+        """Wait until the process exit and return the process return code."""
+        return await self._transport._wait()
+
+    def send_signal(self, signal):
+        self._transport.send_signal(signal)
+
+    def terminate(self):
+        self._transport.terminate()
+
+    def kill(self):
+        self._transport.kill()
+
+    async def _feed_stdin(self, input):
+        debug = self._loop.get_debug()
+        self.stdin.write(input)
+        if debug:
+            logger.debug(
+                '%r communicate: feed stdin (%s bytes)', self, len(input))
+        try:
+            await self.stdin.drain()
+        except (BrokenPipeError, ConnectionResetError) as exc:
+            # communicate() ignores BrokenPipeError and ConnectionResetError
+            if debug:
+                logger.debug('%r communicate: stdin got %r', self, exc)
+
+        if debug:
+            logger.debug('%r communicate: close stdin', self)
+        self.stdin.close()
+
+    async def _noop(self):
+        return None
+
+    async def _read_stream(self, fd):
+        transport = self._transport.get_pipe_transport(fd)
+        if fd == 2:
+            stream = self.stderr
+        else:
+            assert fd == 1
+            stream = self.stdout
+        if self._loop.get_debug():
+            name = 'stdout' if fd == 1 else 'stderr'
+            logger.debug('%r communicate: read %s', self, name)
+        output = await stream.read()
+        if self._loop.get_debug():
+            name = 'stdout' if fd == 1 else 'stderr'
+            logger.debug('%r communicate: close %s', self, name)
+        transport.close()
+        return output
+
+    async def communicate(self, input=None):
+        if input is not None:
+            stdin = self._feed_stdin(input)
+        else:
+            stdin = self._noop()
+        if self.stdout is not None:
+            stdout = self._read_stream(1)
+        else:
+            stdout = self._noop()
+        if self.stderr is not None:
+            stderr = self._read_stream(2)
+        else:
+            stderr = self._noop()
+        stdin, stdout, stderr = await tasks.gather(stdin, stdout, stderr)
+        await self.wait()
+        return (stdout, stderr)
+
+
+async def create_subprocess_shell(cmd, stdin=None, stdout=None, stderr=None,
+                                  limit=streams._DEFAULT_LIMIT, **kwds):
+    loop = events.get_running_loop()
+    protocol_factory = lambda: SubprocessStreamProtocol(limit=limit,
+                                                        loop=loop)
+    transport, protocol = await loop.subprocess_shell(
+        protocol_factory,
+        cmd, stdin=stdin, stdout=stdout,
+        stderr=stderr, **kwds)
+    return Process(transport, protocol, loop)
+
+
+async def create_subprocess_exec(program, *args, stdin=None, stdout=None,
+                                 stderr=None, limit=streams._DEFAULT_LIMIT,
+                                 **kwds):
+    loop = events.get_running_loop()
+    protocol_factory = lambda: SubprocessStreamProtocol(limit=limit,
+                                                        loop=loop)
+    transport, protocol = await loop.subprocess_exec(
+        protocol_factory,
+        program, *args,
+        stdin=stdin, stdout=stdout,
+        stderr=stderr, **kwds)
+    return Process(transport, protocol, loop)

janus/lib/python3.10/asyncio/tasks.py

@@ -0,0 +1,946 @@
+"""Support for tasks, coroutines and the scheduler."""
+
+__all__ = (
+    'Task', 'create_task',
+    'FIRST_COMPLETED', 'FIRST_EXCEPTION', 'ALL_COMPLETED',
+    'wait', 'wait_for', 'as_completed', 'sleep',
+    'gather', 'shield', 'ensure_future', 'run_coroutine_threadsafe',
+    'current_task', 'all_tasks',
+    '_register_task', '_unregister_task', '_enter_task', '_leave_task',
+)
+
+import concurrent.futures
+import contextvars
+import functools
+import inspect
+import itertools
+import types
+import warnings
+import weakref
+from types import GenericAlias
+
+from . import base_tasks
+from . import coroutines
+from . import events
+from . import exceptions
+from . import futures
+from .coroutines import _is_coroutine
+
+# Helper to generate new task names
+# This uses itertools.count() instead of a "+= 1" operation because the latter
+# is not thread safe. See bpo-11866 for a longer explanation.
+_task_name_counter = itertools.count(1).__next__
+
+
+def current_task(loop=None):
+    """Return a currently executed task."""
+    if loop is None:
+        loop = events.get_running_loop()
+    return _current_tasks.get(loop)
+
+
+def all_tasks(loop=None):
+    """Return a set of all tasks for the loop."""
+    if loop is None:
+        loop = events.get_running_loop()
+    # Looping over a WeakSet (_all_tasks) isn't safe as it can be updated from another
+    # thread while we do so. Therefore we cast it to list prior to filtering. The list
+    # cast itself requires iteration, so we repeat it several times ignoring
+    # RuntimeErrors (which are not very likely to occur). See issues 34970 and 36607 for
+    # details.
+    i = 0
+    while True:
+        try:
+            tasks = list(_all_tasks)
+        except RuntimeError:
+            i += 1
+            if i >= 1000:
+                raise
+        else:
+            break
+    return {t for t in tasks
+            if futures._get_loop(t) is loop and not t.done()}
+
+
+def _set_task_name(task, name):
+    if name is not None:
+        try:
+            set_name = task.set_name
+        except AttributeError:
+            pass
+        else:
+            set_name(name)
+
+
+class Task(futures._PyFuture):  # Inherit Python Task implementation
+                                # from a Python Future implementation.
+
+    """A coroutine wrapped in a Future."""
+
+    # An important invariant maintained while a Task not done:
+    #
+    # - Either _fut_waiter is None, and _step() is scheduled;
+    # - or _fut_waiter is some Future, and _step() is *not* scheduled.
+    #
+    # The only transition from the latter to the former is through
+    # _wakeup().  When _fut_waiter is not None, one of its callbacks
+    # must be _wakeup().
+
+    # If False, don't log a message if the task is destroyed whereas its
+    # status is still pending
+    _log_destroy_pending = True
+
+    def __init__(self, coro, *, loop=None, name=None):
+        super().__init__(loop=loop)
+        if self._source_traceback:
+            del self._source_traceback[-1]
+        if not coroutines.iscoroutine(coro):
+            # raise after Future.__init__(), attrs are required for __del__
+            # prevent logging for pending task in __del__
+            self._log_destroy_pending = False
+            raise TypeError(f"a coroutine was expected, got {coro!r}")
+
+        if name is None:
+            self._name = f'Task-{_task_name_counter()}'
+        else:
+            self._name = str(name)
+
+        self._must_cancel = False
+        self._fut_waiter = None
+        self._coro = coro
+        self._context = contextvars.copy_context()
+
+        self._loop.call_soon(self.__step, context=self._context)
+        _register_task(self)
+
+    def __del__(self):
+        if self._state == futures._PENDING and self._log_destroy_pending:
+            context = {
+                'task': self,
+                'message': 'Task was destroyed but it is pending!',
+            }
+            if self._source_traceback:
+                context['source_traceback'] = self._source_traceback
+            self._loop.call_exception_handler(context)
+        super().__del__()
+
+    __class_getitem__ = classmethod(GenericAlias)
+
+    def _repr_info(self):
+        return base_tasks._task_repr_info(self)
+
+    def get_coro(self):
+        return self._coro
+
+    def get_name(self):
+        return self._name
+
+    def set_name(self, value):
+        self._name = str(value)
+
+    def set_result(self, result):
+        raise RuntimeError('Task does not support set_result operation')
+
+    def set_exception(self, exception):
+        raise RuntimeError('Task does not support set_exception operation')
+
+    def get_stack(self, *, limit=None):
+        """Return the list of stack frames for this task's coroutine.
+
+        If the coroutine is not done, this returns the stack where it is
+        suspended.  If the coroutine has completed successfully or was
+        cancelled, this returns an empty list.  If the coroutine was
+        terminated by an exception, this returns the list of traceback
+        frames.
+
+        The frames are always ordered from oldest to newest.
+
+        The optional limit gives the maximum number of frames to
+        return; by default all available frames are returned.  Its
+        meaning differs depending on whether a stack or a traceback is
+        returned: the newest frames of a stack are returned, but the
+        oldest frames of a traceback are returned.  (This matches the
+        behavior of the traceback module.)
+
+        For reasons beyond our control, only one stack frame is
+        returned for a suspended coroutine.
+        """
+        return base_tasks._task_get_stack(self, limit)
+
+    def print_stack(self, *, limit=None, file=None):
+        """Print the stack or traceback for this task's coroutine.
+
+        This produces output similar to that of the traceback module,
+        for the frames retrieved by get_stack().  The limit argument
+        is passed to get_stack().  The file argument is an I/O stream
+        to which the output is written; by default output is written
+        to sys.stderr.
+        """
+        return base_tasks._task_print_stack(self, limit, file)
+
+    def cancel(self, msg=None):
+        """Request that this task cancel itself.
+
+        This arranges for a CancelledError to be thrown into the
+        wrapped coroutine on the next cycle through the event loop.
+        The coroutine then has a chance to clean up or even deny
+        the request using try/except/finally.
+
+        Unlike Future.cancel, this does not guarantee that the
+        task will be cancelled: the exception might be caught and
+        acted upon, delaying cancellation of the task or preventing
+        cancellation completely.  The task may also return a value or
+        raise a different exception.
+
+        Immediately after this method is called, Task.cancelled() will
+        not return True (unless the task was already cancelled).  A
+        task will be marked as cancelled when the wrapped coroutine
+        terminates with a CancelledError exception (even if cancel()
+        was not called).
+        """
+        self._log_traceback = False
+        if self.done():
+            return False
+        if self._fut_waiter is not None:
+            if self._fut_waiter.cancel(msg=msg):
+                # Leave self._fut_waiter; it may be a Task that
+                # catches and ignores the cancellation so we may have
+                # to cancel it again later.
+                return True
+        # It must be the case that self.__step is already scheduled.
+        self._must_cancel = True
+        self._cancel_message = msg
+        return True
+
+    def __step(self, exc=None):
+        if self.done():
+            raise exceptions.InvalidStateError(
+                f'_step(): already done: {self!r}, {exc!r}')
+        if self._must_cancel:
+            if not isinstance(exc, exceptions.CancelledError):
+                exc = self._make_cancelled_error()
+            self._must_cancel = False
+        coro = self._coro
+        self._fut_waiter = None
+
+        _enter_task(self._loop, self)
+        # Call either coro.throw(exc) or coro.send(None).
+        try:
+            if exc is None:
+                # We use the `send` method directly, because coroutines
+                # don't have `__iter__` and `__next__` methods.
+                result = coro.send(None)
+            else:
+                result = coro.throw(exc)
+        except StopIteration as exc:
+            if self._must_cancel:
+                # Task is cancelled right before coro stops.
+                self._must_cancel = False
+                super().cancel(msg=self._cancel_message)
+            else:
+                super().set_result(exc.value)
+        except exceptions.CancelledError as exc:
+            # Save the original exception so we can chain it later.
+            self._cancelled_exc = exc
+            super().cancel()  # I.e., Future.cancel(self).
+        except (KeyboardInterrupt, SystemExit) as exc:
+            super().set_exception(exc)
+            raise
+        except BaseException as exc:
+            super().set_exception(exc)
+        else:
+            blocking = getattr(result, '_asyncio_future_blocking', None)
+            if blocking is not None:
+                # Yielded Future must come from Future.__iter__().
+                if futures._get_loop(result) is not self._loop:
+                    new_exc = RuntimeError(
+                        f'Task {self!r} got Future '
+                        f'{result!r} attached to a different loop')
+                    self._loop.call_soon(
+                        self.__step, new_exc, context=self._context)
+                elif blocking:
+                    if result is self:
+                        new_exc = RuntimeError(
+                            f'Task cannot await on itself: {self!r}')
+                        self._loop.call_soon(
+                            self.__step, new_exc, context=self._context)
+                    else:
+                        result._asyncio_future_blocking = False
+                        result.add_done_callback(
+                            self.__wakeup, context=self._context)
+                        self._fut_waiter = result
+                        if self._must_cancel:
+                            if self._fut_waiter.cancel(
+                                    msg=self._cancel_message):
+                                self._must_cancel = False
+                else:
+                    new_exc = RuntimeError(
+                        f'yield was used instead of yield from '
+                        f'in task {self!r} with {result!r}')
+                    self._loop.call_soon(
+                        self.__step, new_exc, context=self._context)
+
+            elif result is None:
+                # Bare yield relinquishes control for one event loop iteration.
+                self._loop.call_soon(self.__step, context=self._context)
+            elif inspect.isgenerator(result):
+                # Yielding a generator is just wrong.
+                new_exc = RuntimeError(
+                    f'yield was used instead of yield from for '
+                    f'generator in task {self!r} with {result!r}')
+                self._loop.call_soon(
+                    self.__step, new_exc, context=self._context)
+            else:
+                # Yielding something else is an error.
+                new_exc = RuntimeError(f'Task got bad yield: {result!r}')
+                self._loop.call_soon(
+                    self.__step, new_exc, context=self._context)
+        finally:
+            _leave_task(self._loop, self)
+            self = None  # Needed to break cycles when an exception occurs.
+
+    def __wakeup(self, future):
+        try:
+            future.result()
+        except BaseException as exc:
+            # This may also be a cancellation.
+            self.__step(exc)
+        else:
+            # Don't pass the value of `future.result()` explicitly,
+            # as `Future.__iter__` and `Future.__await__` don't need it.
+            # If we call `_step(value, None)` instead of `_step()`,
+            # Python eval loop would use `.send(value)` method call,
+            # instead of `__next__()`, which is slower for futures
+            # that return non-generator iterators from their `__iter__`.
+            self.__step()
+        self = None  # Needed to break cycles when an exception occurs.
+
+
+_PyTask = Task
+
+
+try:
+    import _asyncio
+except ImportError:
+    pass
+else:
+    # _CTask is needed for tests.
+    Task = _CTask = _asyncio.Task
+
+
+def create_task(coro, *, name=None):
+    """Schedule the execution of a coroutine object in a spawn task.
+
+    Return a Task object.
+    """
+    loop = events.get_running_loop()
+    task = loop.create_task(coro)
+    _set_task_name(task, name)
+    return task
+
+
+# wait() and as_completed() similar to those in PEP 3148.
+
+FIRST_COMPLETED = concurrent.futures.FIRST_COMPLETED
+FIRST_EXCEPTION = concurrent.futures.FIRST_EXCEPTION
+ALL_COMPLETED = concurrent.futures.ALL_COMPLETED
+
+
+async def wait(fs, *, timeout=None, return_when=ALL_COMPLETED):
+    """Wait for the Futures and coroutines given by fs to complete.
+
+    The fs iterable must not be empty.
+
+    Coroutines will be wrapped in Tasks.
+
+    Returns two sets of Future: (done, pending).
+
+    Usage:
+
+        done, pending = await asyncio.wait(fs)
+
+    Note: This does not raise TimeoutError! Futures that aren't done
+    when the timeout occurs are returned in the second set.
+    """
+    if futures.isfuture(fs) or coroutines.iscoroutine(fs):
+        raise TypeError(f"expect a list of futures, not {type(fs).__name__}")
+    if not fs:
+        raise ValueError('Set of coroutines/Futures is empty.')
+    if return_when not in (FIRST_COMPLETED, FIRST_EXCEPTION, ALL_COMPLETED):
+        raise ValueError(f'Invalid return_when value: {return_when}')
+
+    loop = events.get_running_loop()
+
+    fs = set(fs)
+
+    if any(coroutines.iscoroutine(f) for f in fs):
+        warnings.warn("The explicit passing of coroutine objects to "
+                      "asyncio.wait() is deprecated since Python 3.8, and "
+                      "scheduled for removal in Python 3.11.",
+                      DeprecationWarning, stacklevel=2)
+
+    fs = {ensure_future(f, loop=loop) for f in fs}
+
+    return await _wait(fs, timeout, return_when, loop)
+
+
+def _release_waiter(waiter, *args):
+    if not waiter.done():
+        waiter.set_result(None)
+
+
+async def wait_for(fut, timeout):
+    """Wait for the single Future or coroutine to complete, with timeout.
+
+    Coroutine will be wrapped in Task.
+
+    Returns result of the Future or coroutine.  When a timeout occurs,
+    it cancels the task and raises TimeoutError.  To avoid the task
+    cancellation, wrap it in shield().
+
+    If the wait is cancelled, the task is also cancelled.
+
+    This function is a coroutine.
+    """
+    loop = events.get_running_loop()
+
+    if timeout is None:
+        return await fut
+
+    if timeout <= 0:
+        fut = ensure_future(fut, loop=loop)
+
+        if fut.done():
+            return fut.result()
+
+        await _cancel_and_wait(fut, loop=loop)
+        try:
+            return fut.result()
+        except exceptions.CancelledError as exc:
+            raise exceptions.TimeoutError() from exc
+
+    waiter = loop.create_future()
+    timeout_handle = loop.call_later(timeout, _release_waiter, waiter)
+    cb = functools.partial(_release_waiter, waiter)
+
+    fut = ensure_future(fut, loop=loop)
+    fut.add_done_callback(cb)
+
+    try:
+        # wait until the future completes or the timeout
+        try:
+            await waiter
+        except exceptions.CancelledError:
+            if fut.done():
+                return fut.result()
+            else:
+                fut.remove_done_callback(cb)
+                # We must ensure that the task is not running
+                # after wait_for() returns.
+                # See https://bugs.python.org/issue32751
+                await _cancel_and_wait(fut, loop=loop)
+                raise
+
+        if fut.done():
+            return fut.result()
+        else:
+            fut.remove_done_callback(cb)
+            # We must ensure that the task is not running
+            # after wait_for() returns.
+            # See https://bugs.python.org/issue32751
+            await _cancel_and_wait(fut, loop=loop)
+            # In case task cancellation failed with some
+            # exception, we should re-raise it
+            # See https://bugs.python.org/issue40607
+            try:
+                return fut.result()
+            except exceptions.CancelledError as exc:
+                raise exceptions.TimeoutError() from exc
+    finally:
+        timeout_handle.cancel()
+
+
+async def _wait(fs, timeout, return_when, loop):
+    """Internal helper for wait().
+
+    The fs argument must be a collection of Futures.
+    """
+    assert fs, 'Set of Futures is empty.'
+    waiter = loop.create_future()
+    timeout_handle = None
+    if timeout is not None:
+        timeout_handle = loop.call_later(timeout, _release_waiter, waiter)
+    counter = len(fs)
+
+    def _on_completion(f):
+        nonlocal counter
+        counter -= 1
+        if (counter <= 0 or
+            return_when == FIRST_COMPLETED or
+            return_when == FIRST_EXCEPTION and (not f.cancelled() and
+                                                f.exception() is not None)):
+            if timeout_handle is not None:
+                timeout_handle.cancel()
+            if not waiter.done():
+                waiter.set_result(None)
+
+    for f in fs:
+        f.add_done_callback(_on_completion)
+
+    try:
+        await waiter
+    finally:
+        if timeout_handle is not None:
+            timeout_handle.cancel()
+        for f in fs:
+            f.remove_done_callback(_on_completion)
+
+    done, pending = set(), set()
+    for f in fs:
+        if f.done():
+            done.add(f)
+        else:
+            pending.add(f)
+    return done, pending
+
+
+async def _cancel_and_wait(fut, loop):
+    """Cancel the *fut* future or task and wait until it completes."""
+
+    waiter = loop.create_future()
+    cb = functools.partial(_release_waiter, waiter)
+    fut.add_done_callback(cb)
+
+    try:
+        fut.cancel()
+        # We cannot wait on *fut* directly to make
+        # sure _cancel_and_wait itself is reliably cancellable.
+        await waiter
+    finally:
+        fut.remove_done_callback(cb)
+
+
+# This is *not* a @coroutine!  It is just an iterator (yielding Futures).
+def as_completed(fs, *, timeout=None):
+    """Return an iterator whose values are coroutines.
+
+    When waiting for the yielded coroutines you'll get the results (or
+    exceptions!) of the original Futures (or coroutines), in the order
+    in which and as soon as they complete.
+
+    This differs from PEP 3148; the proper way to use this is:
+
+        for f in as_completed(fs):
+            result = await f  # The 'await' may raise.
+            # Use result.
+
+    If a timeout is specified, the 'await' will raise
+    TimeoutError when the timeout occurs before all Futures are done.
+
+    Note: The futures 'f' are not necessarily members of fs.
+    """
+    if futures.isfuture(fs) or coroutines.iscoroutine(fs):
+        raise TypeError(f"expect an iterable of futures, not {type(fs).__name__}")
+
+    from .queues import Queue  # Import here to avoid circular import problem.
+    done = Queue()
+
+    loop = events._get_event_loop()
+    todo = {ensure_future(f, loop=loop) for f in set(fs)}
+    timeout_handle = None
+
+    def _on_timeout():
+        for f in todo:
+            f.remove_done_callback(_on_completion)
+            done.put_nowait(None)  # Queue a dummy value for _wait_for_one().
+        todo.clear()  # Can't do todo.remove(f) in the loop.
+
+    def _on_completion(f):
+        if not todo:
+            return  # _on_timeout() was here first.
+        todo.remove(f)
+        done.put_nowait(f)
+        if not todo and timeout_handle is not None:
+            timeout_handle.cancel()
+
+    async def _wait_for_one():
+        f = await done.get()
+        if f is None:
+            # Dummy value from _on_timeout().
+            raise exceptions.TimeoutError
+        return f.result()  # May raise f.exception().
+
+    for f in todo:
+        f.add_done_callback(_on_completion)
+    if todo and timeout is not None:
+        timeout_handle = loop.call_later(timeout, _on_timeout)
+    for _ in range(len(todo)):
+        yield _wait_for_one()
+
+
+@types.coroutine
+def __sleep0():
+    """Skip one event loop run cycle.
+
+    This is a private helper for 'asyncio.sleep()', used
+    when the 'delay' is set to 0.  It uses a bare 'yield'
+    expression (which Task.__step knows how to handle)
+    instead of creating a Future object.
+    """
+    yield
+
+
+async def sleep(delay, result=None):
+    """Coroutine that completes after a given time (in seconds)."""
+    if delay <= 0:
+        await __sleep0()
+        return result
+
+    loop = events.get_running_loop()
+    future = loop.create_future()
+    h = loop.call_later(delay,
+                        futures._set_result_unless_cancelled,
+                        future, result)
+    try:
+        return await future
+    finally:
+        h.cancel()
+
+
+def ensure_future(coro_or_future, *, loop=None):
+    """Wrap a coroutine or an awaitable in a future.
+
+    If the argument is a Future, it is returned directly.
+    """
+    return _ensure_future(coro_or_future, loop=loop)
+
+
+def _ensure_future(coro_or_future, *, loop=None):
+    if futures.isfuture(coro_or_future):
+        if loop is not None and loop is not futures._get_loop(coro_or_future):
+            raise ValueError('The future belongs to a different loop than '
+                            'the one specified as the loop argument')
+        return coro_or_future
+    called_wrap_awaitable = False
+    if not coroutines.iscoroutine(coro_or_future):
+        if inspect.isawaitable(coro_or_future):
+            coro_or_future = _wrap_awaitable(coro_or_future)
+            called_wrap_awaitable = True
+        else:
+            raise TypeError('An asyncio.Future, a coroutine or an awaitable '
+                            'is required')
+
+    if loop is None:
+        loop = events._get_event_loop(stacklevel=4)
+    try:
+        return loop.create_task(coro_or_future)
+    except RuntimeError: 
+        if not called_wrap_awaitable:
+            coro_or_future.close()
+        raise
+
+
+@types.coroutine
+def _wrap_awaitable(awaitable):
+    """Helper for asyncio.ensure_future().
+
+    Wraps awaitable (an object with __await__) into a coroutine
+    that will later be wrapped in a Task by ensure_future().
+    """
+    return (yield from awaitable.__await__())
+
+_wrap_awaitable._is_coroutine = _is_coroutine
+
+
+class _GatheringFuture(futures.Future):
+    """Helper for gather().
+
+    This overrides cancel() to cancel all the children and act more
+    like Task.cancel(), which doesn't immediately mark itself as
+    cancelled.
+    """
+
+    def __init__(self, children, *, loop):
+        assert loop is not None
+        super().__init__(loop=loop)
+        self._children = children
+        self._cancel_requested = False
+
+    def cancel(self, msg=None):
+        if self.done():
+            return False
+        ret = False
+        for child in self._children:
+            if child.cancel(msg=msg):
+                ret = True
+        if ret:
+            # If any child tasks were actually cancelled, we should
+            # propagate the cancellation request regardless of
+            # *return_exceptions* argument.  See issue 32684.
+            self._cancel_requested = True
+        return ret
+
+
+def gather(*coros_or_futures, return_exceptions=False):
+    """Return a future aggregating results from the given coroutines/futures.
+
+    Coroutines will be wrapped in a future and scheduled in the event
+    loop. They will not necessarily be scheduled in the same order as
+    passed in.
+
+    All futures must share the same event loop.  If all the tasks are
+    done successfully, the returned future's result is the list of
+    results (in the order of the original sequence, not necessarily
+    the order of results arrival).  If *return_exceptions* is True,
+    exceptions in the tasks are treated the same as successful
+    results, and gathered in the result list; otherwise, the first
+    raised exception will be immediately propagated to the returned
+    future.
+
+    Cancellation: if the outer Future is cancelled, all children (that
+    have not completed yet) are also cancelled.  If any child is
+    cancelled, this is treated as if it raised CancelledError --
+    the outer Future is *not* cancelled in this case.  (This is to
+    prevent the cancellation of one child to cause other children to
+    be cancelled.)
+
+    If *return_exceptions* is False, cancelling gather() after it
+    has been marked done won't cancel any submitted awaitables.
+    For instance, gather can be marked done after propagating an
+    exception to the caller, therefore, calling ``gather.cancel()``
+    after catching an exception (raised by one of the awaitables) from
+    gather won't cancel any other awaitables.
+    """
+    if not coros_or_futures:
+        loop = events._get_event_loop()
+        outer = loop.create_future()
+        outer.set_result([])
+        return outer
+
+    def _done_callback(fut):
+        nonlocal nfinished
+        nfinished += 1
+
+        if outer is None or outer.done():
+            if not fut.cancelled():
+                # Mark exception retrieved.
+                fut.exception()
+            return
+
+        if not return_exceptions:
+            if fut.cancelled():
+                # Check if 'fut' is cancelled first, as
+                # 'fut.exception()' will *raise* a CancelledError
+                # instead of returning it.
+                exc = fut._make_cancelled_error()
+                outer.set_exception(exc)
+                return
+            else:
+                exc = fut.exception()
+                if exc is not None:
+                    outer.set_exception(exc)
+                    return
+
+        if nfinished == nfuts:
+            # All futures are done; create a list of results
+            # and set it to the 'outer' future.
+            results = []
+
+            for fut in children:
+                if fut.cancelled():
+                    # Check if 'fut' is cancelled first, as 'fut.exception()'
+                    # will *raise* a CancelledError instead of returning it.
+                    # Also, since we're adding the exception return value
+                    # to 'results' instead of raising it, don't bother
+                    # setting __context__.  This also lets us preserve
+                    # calling '_make_cancelled_error()' at most once.
+                    res = exceptions.CancelledError(
+                        '' if fut._cancel_message is None else
+                        fut._cancel_message)
+                else:
+                    res = fut.exception()
+                    if res is None:
+                        res = fut.result()
+                results.append(res)
+
+            if outer._cancel_requested:
+                # If gather is being cancelled we must propagate the
+                # cancellation regardless of *return_exceptions* argument.
+                # See issue 32684.
+                exc = fut._make_cancelled_error()
+                outer.set_exception(exc)
+            else:
+                outer.set_result(results)
+
+    arg_to_fut = {}
+    children = []
+    nfuts = 0
+    nfinished = 0
+    loop = None
+    outer = None  # bpo-46672
+    for arg in coros_or_futures:
+        if arg not in arg_to_fut:
+            fut = _ensure_future(arg, loop=loop)
+            if loop is None:
+                loop = futures._get_loop(fut)
+            if fut is not arg:
+                # 'arg' was not a Future, therefore, 'fut' is a new
+                # Future created specifically for 'arg'.  Since the caller
+                # can't control it, disable the "destroy pending task"
+                # warning.
+                fut._log_destroy_pending = False
+
+            nfuts += 1
+            arg_to_fut[arg] = fut
+            fut.add_done_callback(_done_callback)
+
+        else:
+            # There's a duplicate Future object in coros_or_futures.
+            fut = arg_to_fut[arg]
+
+        children.append(fut)
+
+    outer = _GatheringFuture(children, loop=loop)
+    return outer
+
+
+def shield(arg):
+    """Wait for a future, shielding it from cancellation.
+
+    The statement
+
+        task = asyncio.create_task(something())
+        res = await shield(task)
+
+    is exactly equivalent to the statement
+
+        res = await something()
+
+    *except* that if the coroutine containing it is cancelled, the
+    task running in something() is not cancelled.  From the POV of
+    something(), the cancellation did not happen.  But its caller is
+    still cancelled, so the yield-from expression still raises
+    CancelledError.  Note: If something() is cancelled by other means
+    this will still cancel shield().
+
+    If you want to completely ignore cancellation (not recommended)
+    you can combine shield() with a try/except clause, as follows:
+
+        task = asyncio.create_task(something())
+        try:
+            res = await shield(task)
+        except CancelledError:
+            res = None
+
+    Save a reference to tasks passed to this function, to avoid
+    a task disappearing mid-execution. The event loop only keeps
+    weak references to tasks. A task that isn't referenced elsewhere
+    may get garbage collected at any time, even before it's done.
+    """
+    inner = _ensure_future(arg)
+    if inner.done():
+        # Shortcut.
+        return inner
+    loop = futures._get_loop(inner)
+    outer = loop.create_future()
+
+    def _inner_done_callback(inner):
+        if outer.cancelled():
+            if not inner.cancelled():
+                # Mark inner's result as retrieved.
+                inner.exception()
+            return
+
+        if inner.cancelled():
+            outer.cancel()
+        else:
+            exc = inner.exception()
+            if exc is not None:
+                outer.set_exception(exc)
+            else:
+                outer.set_result(inner.result())
+
+
+    def _outer_done_callback(outer):
+        if not inner.done():
+            inner.remove_done_callback(_inner_done_callback)
+
+    inner.add_done_callback(_inner_done_callback)
+    outer.add_done_callback(_outer_done_callback)
+    return outer
+
+
+def run_coroutine_threadsafe(coro, loop):
+    """Submit a coroutine object to a given event loop.
+
+    Return a concurrent.futures.Future to access the result.
+    """
+    if not coroutines.iscoroutine(coro):
+        raise TypeError('A coroutine object is required')
+    future = concurrent.futures.Future()
+
+    def callback():
+        try:
+            futures._chain_future(ensure_future(coro, loop=loop), future)
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException as exc:
+            if future.set_running_or_notify_cancel():
+                future.set_exception(exc)
+            raise
+
+    loop.call_soon_threadsafe(callback)
+    return future
+
+
+# WeakSet containing all alive tasks.
+_all_tasks = weakref.WeakSet()
+
+# Dictionary containing tasks that are currently active in
+# all running event loops.  {EventLoop: Task}
+_current_tasks = {}
+
+
+def _register_task(task):
+    """Register a new task in asyncio as executed by loop."""
+    _all_tasks.add(task)
+
+
+def _enter_task(loop, task):
+    current_task = _current_tasks.get(loop)
+    if current_task is not None:
+        raise RuntimeError(f"Cannot enter into task {task!r} while another "
+                           f"task {current_task!r} is being executed.")
+    _current_tasks[loop] = task
+
+
+def _leave_task(loop, task):
+    current_task = _current_tasks.get(loop)
+    if current_task is not task:
+        raise RuntimeError(f"Leaving task {task!r} does not match "
+                           f"the current task {current_task!r}.")
+    del _current_tasks[loop]
+
+
+def _unregister_task(task):
+    """Unregister a task."""
+    _all_tasks.discard(task)
+
+
+_py_register_task = _register_task
+_py_unregister_task = _unregister_task
+_py_enter_task = _enter_task
+_py_leave_task = _leave_task
+
+
+try:
+    from _asyncio import (_register_task, _unregister_task,
+                          _enter_task, _leave_task,
+                          _all_tasks, _current_tasks)
+except ImportError:
+    pass
+else:
+    _c_register_task = _register_task
+    _c_unregister_task = _unregister_task
+    _c_enter_task = _enter_task
+    _c_leave_task = _leave_task

janus/lib/python3.10/asyncio/threads.py

@@ -0,0 +1,25 @@
+"""High-level support for working with threads in asyncio"""
+
+import functools
+import contextvars
+
+from . import events
+
+
+__all__ = "to_thread",
+
+
+async def to_thread(func, /, *args, **kwargs):
+    """Asynchronously run function *func* in a separate thread.
+
+    Any *args and **kwargs supplied for this function are directly passed
+    to *func*. Also, the current :class:`contextvars.Context` is propagated,
+    allowing context variables from the main thread to be accessed in the
+    separate thread.
+
+    Return a coroutine that can be awaited to get the eventual result of *func*.
+    """
+    loop = events.get_running_loop()
+    ctx = contextvars.copy_context()
+    func_call = functools.partial(ctx.run, func, *args, **kwargs)
+    return await loop.run_in_executor(None, func_call)

janus/lib/python3.10/asyncio/windows_events.py

@@ -0,0 +1,924 @@
+"""Selector and proactor event loops for Windows."""
+
+import sys
+
+if sys.platform != 'win32':  # pragma: no cover
+    raise ImportError('win32 only')
+
+import _overlapped
+import _winapi
+import errno
+import math
+import msvcrt
+import socket
+import struct
+import time
+import weakref
+
+from . import events
+from . import base_subprocess
+from . import futures
+from . import exceptions
+from . import proactor_events
+from . import selector_events
+from . import tasks
+from . import windows_utils
+from .log import logger
+
+
+__all__ = (
+    'SelectorEventLoop', 'ProactorEventLoop', 'IocpProactor',
+    'DefaultEventLoopPolicy', 'WindowsSelectorEventLoopPolicy',
+    'WindowsProactorEventLoopPolicy',
+)
+
+
+NULL = 0
+INFINITE = 0xffffffff
+ERROR_CONNECTION_REFUSED = 1225
+ERROR_CONNECTION_ABORTED = 1236
+
+# Initial delay in seconds for connect_pipe() before retrying to connect
+CONNECT_PIPE_INIT_DELAY = 0.001
+
+# Maximum delay in seconds for connect_pipe() before retrying to connect
+CONNECT_PIPE_MAX_DELAY = 0.100
+
+
+class _OverlappedFuture(futures.Future):
+    """Subclass of Future which represents an overlapped operation.
+
+    Cancelling it will immediately cancel the overlapped operation.
+    """
+
+    def __init__(self, ov, *, loop=None):
+        super().__init__(loop=loop)
+        if self._source_traceback:
+            del self._source_traceback[-1]
+        self._ov = ov
+
+    def _repr_info(self):
+        info = super()._repr_info()
+        if self._ov is not None:
+            state = 'pending' if self._ov.pending else 'completed'
+            info.insert(1, f'overlapped=<{state}, {self._ov.address:#x}>')
+        return info
+
+    def _cancel_overlapped(self):
+        if self._ov is None:
+            return
+        try:
+            self._ov.cancel()
+        except OSError as exc:
+            context = {
+                'message': 'Cancelling an overlapped future failed',
+                'exception': exc,
+                'future': self,
+            }
+            if self._source_traceback:
+                context['source_traceback'] = self._source_traceback
+            self._loop.call_exception_handler(context)
+        self._ov = None
+
+    def cancel(self, msg=None):
+        self._cancel_overlapped()
+        return super().cancel(msg=msg)
+
+    def set_exception(self, exception):
+        super().set_exception(exception)
+        self._cancel_overlapped()
+
+    def set_result(self, result):
+        super().set_result(result)
+        self._ov = None
+
+
+class _BaseWaitHandleFuture(futures.Future):
+    """Subclass of Future which represents a wait handle."""
+
+    def __init__(self, ov, handle, wait_handle, *, loop=None):
+        super().__init__(loop=loop)
+        if self._source_traceback:
+            del self._source_traceback[-1]
+        # Keep a reference to the Overlapped object to keep it alive until the
+        # wait is unregistered
+        self._ov = ov
+        self._handle = handle
+        self._wait_handle = wait_handle
+
+        # Should we call UnregisterWaitEx() if the wait completes
+        # or is cancelled?
+        self._registered = True
+
+    def _poll(self):
+        # non-blocking wait: use a timeout of 0 millisecond
+        return (_winapi.WaitForSingleObject(self._handle, 0) ==
+                _winapi.WAIT_OBJECT_0)
+
+    def _repr_info(self):
+        info = super()._repr_info()
+        info.append(f'handle={self._handle:#x}')
+        if self._handle is not None:
+            state = 'signaled' if self._poll() else 'waiting'
+            info.append(state)
+        if self._wait_handle is not None:
+            info.append(f'wait_handle={self._wait_handle:#x}')
+        return info
+
+    def _unregister_wait_cb(self, fut):
+        # The wait was unregistered: it's not safe to destroy the Overlapped
+        # object
+        self._ov = None
+
+    def _unregister_wait(self):
+        if not self._registered:
+            return
+        self._registered = False
+
+        wait_handle = self._wait_handle
+        self._wait_handle = None
+        try:
+            _overlapped.UnregisterWait(wait_handle)
+        except OSError as exc:
+            if exc.winerror != _overlapped.ERROR_IO_PENDING:
+                context = {
+                    'message': 'Failed to unregister the wait handle',
+                    'exception': exc,
+                    'future': self,
+                }
+                if self._source_traceback:
+                    context['source_traceback'] = self._source_traceback
+                self._loop.call_exception_handler(context)
+                return
+            # ERROR_IO_PENDING means that the unregister is pending
+
+        self._unregister_wait_cb(None)
+
+    def cancel(self, msg=None):
+        self._unregister_wait()
+        return super().cancel(msg=msg)
+
+    def set_exception(self, exception):
+        self._unregister_wait()
+        super().set_exception(exception)
+
+    def set_result(self, result):
+        self._unregister_wait()
+        super().set_result(result)
+
+
+class _WaitCancelFuture(_BaseWaitHandleFuture):
+    """Subclass of Future which represents a wait for the cancellation of a
+    _WaitHandleFuture using an event.
+    """
+
+    def __init__(self, ov, event, wait_handle, *, loop=None):
+        super().__init__(ov, event, wait_handle, loop=loop)
+
+        self._done_callback = None
+
+    def cancel(self):
+        raise RuntimeError("_WaitCancelFuture must not be cancelled")
+
+    def set_result(self, result):
+        super().set_result(result)
+        if self._done_callback is not None:
+            self._done_callback(self)
+
+    def set_exception(self, exception):
+        super().set_exception(exception)
+        if self._done_callback is not None:
+            self._done_callback(self)
+
+
+class _WaitHandleFuture(_BaseWaitHandleFuture):
+    def __init__(self, ov, handle, wait_handle, proactor, *, loop=None):
+        super().__init__(ov, handle, wait_handle, loop=loop)
+        self._proactor = proactor
+        self._unregister_proactor = True
+        self._event = _overlapped.CreateEvent(None, True, False, None)
+        self._event_fut = None
+
+    def _unregister_wait_cb(self, fut):
+        if self._event is not None:
+            _winapi.CloseHandle(self._event)
+            self._event = None
+            self._event_fut = None
+
+        # If the wait was cancelled, the wait may never be signalled, so
+        # it's required to unregister it. Otherwise, IocpProactor.close() will
+        # wait forever for an event which will never come.
+        #
+        # If the IocpProactor already received the event, it's safe to call
+        # _unregister() because we kept a reference to the Overlapped object
+        # which is used as a unique key.
+        self._proactor._unregister(self._ov)
+        self._proactor = None
+
+        super()._unregister_wait_cb(fut)
+
+    def _unregister_wait(self):
+        if not self._registered:
+            return
+        self._registered = False
+
+        wait_handle = self._wait_handle
+        self._wait_handle = None
+        try:
+            _overlapped.UnregisterWaitEx(wait_handle, self._event)
+        except OSError as exc:
+            if exc.winerror != _overlapped.ERROR_IO_PENDING:
+                context = {
+                    'message': 'Failed to unregister the wait handle',
+                    'exception': exc,
+                    'future': self,
+                }
+                if self._source_traceback:
+                    context['source_traceback'] = self._source_traceback
+                self._loop.call_exception_handler(context)
+                return
+            # ERROR_IO_PENDING is not an error, the wait was unregistered
+
+        self._event_fut = self._proactor._wait_cancel(self._event,
+                                                      self._unregister_wait_cb)
+
+
+class PipeServer(object):
+    """Class representing a pipe server.
+
+    This is much like a bound, listening socket.
+    """
+    def __init__(self, address):
+        self._address = address
+        self._free_instances = weakref.WeakSet()
+        # initialize the pipe attribute before calling _server_pipe_handle()
+        # because this function can raise an exception and the destructor calls
+        # the close() method
+        self._pipe = None
+        self._accept_pipe_future = None
+        self._pipe = self._server_pipe_handle(True)
+
+    def _get_unconnected_pipe(self):
+        # Create new instance and return previous one.  This ensures
+        # that (until the server is closed) there is always at least
+        # one pipe handle for address.  Therefore if a client attempt
+        # to connect it will not fail with FileNotFoundError.
+        tmp, self._pipe = self._pipe, self._server_pipe_handle(False)
+        return tmp
+
+    def _server_pipe_handle(self, first):
+        # Return a wrapper for a new pipe handle.
+        if self.closed():
+            return None
+        flags = _winapi.PIPE_ACCESS_DUPLEX | _winapi.FILE_FLAG_OVERLAPPED
+        if first:
+            flags |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
+        h = _winapi.CreateNamedPipe(
+            self._address, flags,
+            _winapi.PIPE_TYPE_MESSAGE | _winapi.PIPE_READMODE_MESSAGE |
+            _winapi.PIPE_WAIT,
+            _winapi.PIPE_UNLIMITED_INSTANCES,
+            windows_utils.BUFSIZE, windows_utils.BUFSIZE,
+            _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL)
+        pipe = windows_utils.PipeHandle(h)
+        self._free_instances.add(pipe)
+        return pipe
+
+    def closed(self):
+        return (self._address is None)
+
+    def close(self):
+        if self._accept_pipe_future is not None:
+            self._accept_pipe_future.cancel()
+            self._accept_pipe_future = None
+        # Close all instances which have not been connected to by a client.
+        if self._address is not None:
+            for pipe in self._free_instances:
+                pipe.close()
+            self._pipe = None
+            self._address = None
+            self._free_instances.clear()
+
+    __del__ = close
+
+
+class _WindowsSelectorEventLoop(selector_events.BaseSelectorEventLoop):
+    """Windows version of selector event loop."""
+
+
+class ProactorEventLoop(proactor_events.BaseProactorEventLoop):
+    """Windows version of proactor event loop using IOCP."""
+
+    def __init__(self, proactor=None):
+        if proactor is None:
+            proactor = IocpProactor()
+        super().__init__(proactor)
+
+    def run_forever(self):
+        try:
+            assert self._self_reading_future is None
+            self.call_soon(self._loop_self_reading)
+            super().run_forever()
+        finally:
+            if self._self_reading_future is not None:
+                ov = self._self_reading_future._ov
+                self._self_reading_future.cancel()
+                # self_reading_future always uses IOCP, so even though it's
+                # been cancelled, we need to make sure that the IOCP message
+                # is received so that the kernel is not holding on to the
+                # memory, possibly causing memory corruption later. Only
+                # unregister it if IO is complete in all respects. Otherwise
+                # we need another _poll() later to complete the IO.
+                if ov is not None and not ov.pending:
+                    self._proactor._unregister(ov)
+                self._self_reading_future = None
+
+    async def create_pipe_connection(self, protocol_factory, address):
+        f = self._proactor.connect_pipe(address)
+        pipe = await f
+        protocol = protocol_factory()
+        trans = self._make_duplex_pipe_transport(pipe, protocol,
+                                                 extra={'addr': address})
+        return trans, protocol
+
+    async def start_serving_pipe(self, protocol_factory, address):
+        server = PipeServer(address)
+
+        def loop_accept_pipe(f=None):
+            pipe = None
+            try:
+                if f:
+                    pipe = f.result()
+                    server._free_instances.discard(pipe)
+
+                    if server.closed():
+                        # A client connected before the server was closed:
+                        # drop the client (close the pipe) and exit
+                        pipe.close()
+                        return
+
+                    protocol = protocol_factory()
+                    self._make_duplex_pipe_transport(
+                        pipe, protocol, extra={'addr': address})
+
+                pipe = server._get_unconnected_pipe()
+                if pipe is None:
+                    return
+
+                f = self._proactor.accept_pipe(pipe)
+            except BrokenPipeError:
+                if pipe and pipe.fileno() != -1:
+                    pipe.close()
+                self.call_soon(loop_accept_pipe)
+            except OSError as exc:
+                if pipe and pipe.fileno() != -1:
+                    self.call_exception_handler({
+                        'message': 'Pipe accept failed',
+                        'exception': exc,
+                        'pipe': pipe,
+                    })
+                    pipe.close()
+                elif self._debug:
+                    logger.warning("Accept pipe failed on pipe %r",
+                                   pipe, exc_info=True)
+                self.call_soon(loop_accept_pipe)
+            except exceptions.CancelledError:
+                if pipe:
+                    pipe.close()
+            else:
+                server._accept_pipe_future = f
+                f.add_done_callback(loop_accept_pipe)
+
+        self.call_soon(loop_accept_pipe)
+        return [server]
+
+    async def _make_subprocess_transport(self, protocol, args, shell,
+                                         stdin, stdout, stderr, bufsize,
+                                         extra=None, **kwargs):
+        waiter = self.create_future()
+        transp = _WindowsSubprocessTransport(self, protocol, args, shell,
+                                             stdin, stdout, stderr, bufsize,
+                                             waiter=waiter, extra=extra,
+                                             **kwargs)
+        try:
+            await waiter
+        except (SystemExit, KeyboardInterrupt):
+            raise
+        except BaseException:
+            transp.close()
+            await transp._wait()
+            raise
+
+        return transp
+
+
+class IocpProactor:
+    """Proactor implementation using IOCP."""
+
+    def __init__(self, concurrency=0xffffffff):
+        self._loop = None
+        self._results = []
+        self._iocp = _overlapped.CreateIoCompletionPort(
+            _overlapped.INVALID_HANDLE_VALUE, NULL, 0, concurrency)
+        self._cache = {}
+        self._registered = weakref.WeakSet()
+        self._unregistered = []
+        self._stopped_serving = weakref.WeakSet()
+
+    def _check_closed(self):
+        if self._iocp is None:
+            raise RuntimeError('IocpProactor is closed')
+
+    def __repr__(self):
+        info = ['overlapped#=%s' % len(self._cache),
+                'result#=%s' % len(self._results)]
+        if self._iocp is None:
+            info.append('closed')
+        return '<%s %s>' % (self.__class__.__name__, " ".join(info))
+
+    def set_loop(self, loop):
+        self._loop = loop
+
+    def select(self, timeout=None):
+        if not self._results:
+            self._poll(timeout)
+        tmp = self._results
+        self._results = []
+        try:
+            return tmp
+        finally:
+            # Needed to break cycles when an exception occurs.
+            tmp = None
+
+    def _result(self, value):
+        fut = self._loop.create_future()
+        fut.set_result(value)
+        return fut
+
+    def recv(self, conn, nbytes, flags=0):
+        self._register_with_iocp(conn)
+        ov = _overlapped.Overlapped(NULL)
+        try:
+            if isinstance(conn, socket.socket):
+                ov.WSARecv(conn.fileno(), nbytes, flags)
+            else:
+                ov.ReadFile(conn.fileno(), nbytes)
+        except BrokenPipeError:
+            return self._result(b'')
+
+        def finish_recv(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+
+        return self._register(ov, conn, finish_recv)
+
+    def recv_into(self, conn, buf, flags=0):
+        self._register_with_iocp(conn)
+        ov = _overlapped.Overlapped(NULL)
+        try:
+            if isinstance(conn, socket.socket):
+                ov.WSARecvInto(conn.fileno(), buf, flags)
+            else:
+                ov.ReadFileInto(conn.fileno(), buf)
+        except BrokenPipeError:
+            return self._result(0)
+
+        def finish_recv(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+
+        return self._register(ov, conn, finish_recv)
+
+    def recvfrom(self, conn, nbytes, flags=0):
+        self._register_with_iocp(conn)
+        ov = _overlapped.Overlapped(NULL)
+        try:
+            ov.WSARecvFrom(conn.fileno(), nbytes, flags)
+        except BrokenPipeError:
+            return self._result((b'', None))
+
+        def finish_recv(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+
+        return self._register(ov, conn, finish_recv)
+
+    def sendto(self, conn, buf, flags=0, addr=None):
+        self._register_with_iocp(conn)
+        ov = _overlapped.Overlapped(NULL)
+
+        ov.WSASendTo(conn.fileno(), buf, flags, addr)
+
+        def finish_send(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+
+        return self._register(ov, conn, finish_send)
+
+    def send(self, conn, buf, flags=0):
+        self._register_with_iocp(conn)
+        ov = _overlapped.Overlapped(NULL)
+        if isinstance(conn, socket.socket):
+            ov.WSASend(conn.fileno(), buf, flags)
+        else:
+            ov.WriteFile(conn.fileno(), buf)
+
+        def finish_send(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+
+        return self._register(ov, conn, finish_send)
+
+    def accept(self, listener):
+        self._register_with_iocp(listener)
+        conn = self._get_accept_socket(listener.family)
+        ov = _overlapped.Overlapped(NULL)
+        ov.AcceptEx(listener.fileno(), conn.fileno())
+
+        def finish_accept(trans, key, ov):
+            ov.getresult()
+            # Use SO_UPDATE_ACCEPT_CONTEXT so getsockname() etc work.
+            buf = struct.pack('@P', listener.fileno())
+            conn.setsockopt(socket.SOL_SOCKET,
+                            _overlapped.SO_UPDATE_ACCEPT_CONTEXT, buf)
+            conn.settimeout(listener.gettimeout())
+            return conn, conn.getpeername()
+
+        async def accept_coro(future, conn):
+            # Coroutine closing the accept socket if the future is cancelled
+            try:
+                await future
+            except exceptions.CancelledError:
+                conn.close()
+                raise
+
+        future = self._register(ov, listener, finish_accept)
+        coro = accept_coro(future, conn)
+        tasks.ensure_future(coro, loop=self._loop)
+        return future
+
+    def connect(self, conn, address):
+        if conn.type == socket.SOCK_DGRAM:
+            # WSAConnect will complete immediately for UDP sockets so we don't
+            # need to register any IOCP operation
+            _overlapped.WSAConnect(conn.fileno(), address)
+            fut = self._loop.create_future()
+            fut.set_result(None)
+            return fut
+
+        self._register_with_iocp(conn)
+        # The socket needs to be locally bound before we call ConnectEx().
+        try:
+            _overlapped.BindLocal(conn.fileno(), conn.family)
+        except OSError as e:
+            if e.winerror != errno.WSAEINVAL:
+                raise
+            # Probably already locally bound; check using getsockname().
+            if conn.getsockname()[1] == 0:
+                raise
+        ov = _overlapped.Overlapped(NULL)
+        ov.ConnectEx(conn.fileno(), address)
+
+        def finish_connect(trans, key, ov):
+            ov.getresult()
+            # Use SO_UPDATE_CONNECT_CONTEXT so getsockname() etc work.
+            conn.setsockopt(socket.SOL_SOCKET,
+                            _overlapped.SO_UPDATE_CONNECT_CONTEXT, 0)
+            return conn
+
+        return self._register(ov, conn, finish_connect)
+
+    def sendfile(self, sock, file, offset, count):
+        self._register_with_iocp(sock)
+        ov = _overlapped.Overlapped(NULL)
+        offset_low = offset & 0xffff_ffff
+        offset_high = (offset >> 32) & 0xffff_ffff
+        ov.TransmitFile(sock.fileno(),
+                        msvcrt.get_osfhandle(file.fileno()),
+                        offset_low, offset_high,
+                        count, 0, 0)
+
+        def finish_sendfile(trans, key, ov):
+            try:
+                return ov.getresult()
+            except OSError as exc:
+                if exc.winerror in (_overlapped.ERROR_NETNAME_DELETED,
+                                    _overlapped.ERROR_OPERATION_ABORTED):
+                    raise ConnectionResetError(*exc.args)
+                else:
+                    raise
+        return self._register(ov, sock, finish_sendfile)
+
+    def accept_pipe(self, pipe):
+        self._register_with_iocp(pipe)
+        ov = _overlapped.Overlapped(NULL)
+        connected = ov.ConnectNamedPipe(pipe.fileno())
+
+        if connected:
+            # ConnectNamePipe() failed with ERROR_PIPE_CONNECTED which means
+            # that the pipe is connected. There is no need to wait for the
+            # completion of the connection.
+            return self._result(pipe)
+
+        def finish_accept_pipe(trans, key, ov):
+            ov.getresult()
+            return pipe
+
+        return self._register(ov, pipe, finish_accept_pipe)
+
+    async def connect_pipe(self, address):
+        delay = CONNECT_PIPE_INIT_DELAY
+        while True:
+            # Unfortunately there is no way to do an overlapped connect to
+            # a pipe.  Call CreateFile() in a loop until it doesn't fail with
+            # ERROR_PIPE_BUSY.
+            try:
+                handle = _overlapped.ConnectPipe(address)
+                break
+            except OSError as exc:
+                if exc.winerror != _overlapped.ERROR_PIPE_BUSY:
+                    raise
+
+            # ConnectPipe() failed with ERROR_PIPE_BUSY: retry later
+            delay = min(delay * 2, CONNECT_PIPE_MAX_DELAY)
+            await tasks.sleep(delay)
+
+        return windows_utils.PipeHandle(handle)
+
+    def wait_for_handle(self, handle, timeout=None):
+        """Wait for a handle.
+
+        Return a Future object. The result of the future is True if the wait
+        completed, or False if the wait did not complete (on timeout).
+        """
+        return self._wait_for_handle(handle, timeout, False)
+
+    def _wait_cancel(self, event, done_callback):
+        fut = self._wait_for_handle(event, None, True)
+        # add_done_callback() cannot be used because the wait may only complete
+        # in IocpProactor.close(), while the event loop is not running.
+        fut._done_callback = done_callback
+        return fut
+
+    def _wait_for_handle(self, handle, timeout, _is_cancel):
+        self._check_closed()
+
+        if timeout is None:
+            ms = _winapi.INFINITE
+        else:
+            # RegisterWaitForSingleObject() has a resolution of 1 millisecond,
+            # round away from zero to wait *at least* timeout seconds.
+            ms = math.ceil(timeout * 1e3)
+
+        # We only create ov so we can use ov.address as a key for the cache.
+        ov = _overlapped.Overlapped(NULL)
+        wait_handle = _overlapped.RegisterWaitWithQueue(
+            handle, self._iocp, ov.address, ms)
+        if _is_cancel:
+            f = _WaitCancelFuture(ov, handle, wait_handle, loop=self._loop)
+        else:
+            f = _WaitHandleFuture(ov, handle, wait_handle, self,
+                                  loop=self._loop)
+        if f._source_traceback:
+            del f._source_traceback[-1]
+
+        def finish_wait_for_handle(trans, key, ov):
+            # Note that this second wait means that we should only use
+            # this with handles types where a successful wait has no
+            # effect.  So events or processes are all right, but locks
+            # or semaphores are not.  Also note if the handle is
+            # signalled and then quickly reset, then we may return
+            # False even though we have not timed out.
+            return f._poll()
+
+        self._cache[ov.address] = (f, ov, 0, finish_wait_for_handle)
+        return f
+
+    def _register_with_iocp(self, obj):
+        # To get notifications of finished ops on this objects sent to the
+        # completion port, were must register the handle.
+        if obj not in self._registered:
+            self._registered.add(obj)
+            _overlapped.CreateIoCompletionPort(obj.fileno(), self._iocp, 0, 0)
+            # XXX We could also use SetFileCompletionNotificationModes()
+            # to avoid sending notifications to completion port of ops
+            # that succeed immediately.
+
+    def _register(self, ov, obj, callback):
+        self._check_closed()
+
+        # Return a future which will be set with the result of the
+        # operation when it completes.  The future's value is actually
+        # the value returned by callback().
+        f = _OverlappedFuture(ov, loop=self._loop)
+        if f._source_traceback:
+            del f._source_traceback[-1]
+        if not ov.pending:
+            # The operation has completed, so no need to postpone the
+            # work.  We cannot take this short cut if we need the
+            # NumberOfBytes, CompletionKey values returned by
+            # PostQueuedCompletionStatus().
+            try:
+                value = callback(None, None, ov)
+            except OSError as e:
+                f.set_exception(e)
+            else:
+                f.set_result(value)
+            # Even if GetOverlappedResult() was called, we have to wait for the
+            # notification of the completion in GetQueuedCompletionStatus().
+            # Register the overlapped operation to keep a reference to the
+            # OVERLAPPED object, otherwise the memory is freed and Windows may
+            # read uninitialized memory.
+
+        # Register the overlapped operation for later.  Note that
+        # we only store obj to prevent it from being garbage
+        # collected too early.
+        self._cache[ov.address] = (f, ov, obj, callback)
+        return f
+
+    def _unregister(self, ov):
+        """Unregister an overlapped object.
+
+        Call this method when its future has been cancelled. The event can
+        already be signalled (pending in the proactor event queue). It is also
+        safe if the event is never signalled (because it was cancelled).
+        """
+        self._check_closed()
+        self._unregistered.append(ov)
+
+    def _get_accept_socket(self, family):
+        s = socket.socket(family)
+        s.settimeout(0)
+        return s
+
+    def _poll(self, timeout=None):
+        if timeout is None:
+            ms = INFINITE
+        elif timeout < 0:
+            raise ValueError("negative timeout")
+        else:
+            # GetQueuedCompletionStatus() has a resolution of 1 millisecond,
+            # round away from zero to wait *at least* timeout seconds.
+            ms = math.ceil(timeout * 1e3)
+            if ms >= INFINITE:
+                raise ValueError("timeout too big")
+
+        while True:
+            status = _overlapped.GetQueuedCompletionStatus(self._iocp, ms)
+            if status is None:
+                break
+            ms = 0
+
+            err, transferred, key, address = status
+            try:
+                f, ov, obj, callback = self._cache.pop(address)
+            except KeyError:
+                if self._loop.get_debug():
+                    self._loop.call_exception_handler({
+                        'message': ('GetQueuedCompletionStatus() returned an '
+                                    'unexpected event'),
+                        'status': ('err=%s transferred=%s key=%#x address=%#x'
+                                   % (err, transferred, key, address)),
+                    })
+
+                # key is either zero, or it is used to return a pipe
+                # handle which should be closed to avoid a leak.
+                if key not in (0, _overlapped.INVALID_HANDLE_VALUE):
+                    _winapi.CloseHandle(key)
+                continue
+
+            if obj in self._stopped_serving:
+                f.cancel()
+            # Don't call the callback if _register() already read the result or
+            # if the overlapped has been cancelled
+            elif not f.done():
+                try:
+                    value = callback(transferred, key, ov)
+                except OSError as e:
+                    f.set_exception(e)
+                    self._results.append(f)
+                else:
+                    f.set_result(value)
+                    self._results.append(f)
+                finally:
+                    f = None
+
+        # Remove unregistered futures
+        for ov in self._unregistered:
+            self._cache.pop(ov.address, None)
+        self._unregistered.clear()
+
+    def _stop_serving(self, obj):
+        # obj is a socket or pipe handle.  It will be closed in
+        # BaseProactorEventLoop._stop_serving() which will make any
+        # pending operations fail quickly.
+        self._stopped_serving.add(obj)
+
+    def close(self):
+        if self._iocp is None:
+            # already closed
+            return
+
+        # Cancel remaining registered operations.
+        for address, (fut, ov, obj, callback) in list(self._cache.items()):
+            if fut.cancelled():
+                # Nothing to do with cancelled futures
+                pass
+            elif isinstance(fut, _WaitCancelFuture):
+                # _WaitCancelFuture must not be cancelled
+                pass
+            else:
+                try:
+                    fut.cancel()
+                except OSError as exc:
+                    if self._loop is not None:
+                        context = {
+                            'message': 'Cancelling a future failed',
+                            'exception': exc,
+                            'future': fut,
+                        }
+                        if fut._source_traceback:
+                            context['source_traceback'] = fut._source_traceback
+                        self._loop.call_exception_handler(context)
+
+        # Wait until all cancelled overlapped complete: don't exit with running
+        # overlapped to prevent a crash. Display progress every second if the
+        # loop is still running.
+        msg_update = 1.0
+        start_time = time.monotonic()
+        next_msg = start_time + msg_update
+        while self._cache:
+            if next_msg <= time.monotonic():
+                logger.debug('%r is running after closing for %.1f seconds',
+                             self, time.monotonic() - start_time)
+                next_msg = time.monotonic() + msg_update
+
+            # handle a few events, or timeout
+            self._poll(msg_update)
+
+        self._results = []
+
+        _winapi.CloseHandle(self._iocp)
+        self._iocp = None
+
+    def __del__(self):
+        self.close()
+
+
+class _WindowsSubprocessTransport(base_subprocess.BaseSubprocessTransport):
+
+    def _start(self, args, shell, stdin, stdout, stderr, bufsize, **kwargs):
+        self._proc = windows_utils.Popen(
+            args, shell=shell, stdin=stdin, stdout=stdout, stderr=stderr,
+            bufsize=bufsize, **kwargs)
+
+        def callback(f):
+            returncode = self._proc.poll()
+            self._process_exited(returncode)
+
+        f = self._loop._proactor.wait_for_handle(int(self._proc._handle))
+        f.add_done_callback(callback)
+
+
+SelectorEventLoop = _WindowsSelectorEventLoop
+
+
+class WindowsSelectorEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
+    _loop_factory = SelectorEventLoop
+
+
+class WindowsProactorEventLoopPolicy(events.BaseDefaultEventLoopPolicy):
+    _loop_factory = ProactorEventLoop
+
+
+DefaultEventLoopPolicy = WindowsProactorEventLoopPolicy

janus/lib/python3.10/asyncio/windows_utils.py

@@ -0,0 +1,173 @@
+"""Various Windows specific bits and pieces."""
+
+import sys
+
+if sys.platform != 'win32':  # pragma: no cover
+    raise ImportError('win32 only')
+
+import _winapi
+import itertools
+import msvcrt
+import os
+import subprocess
+import tempfile
+import warnings
+
+
+__all__ = 'pipe', 'Popen', 'PIPE', 'PipeHandle'
+
+
+# Constants/globals
+
+
+BUFSIZE = 8192
+PIPE = subprocess.PIPE
+STDOUT = subprocess.STDOUT
+_mmap_counter = itertools.count()
+
+
+# Replacement for os.pipe() using handles instead of fds
+
+
+def pipe(*, duplex=False, overlapped=(True, True), bufsize=BUFSIZE):
+    """Like os.pipe() but with overlapped support and using handles not fds."""
+    address = tempfile.mktemp(
+        prefix=r'\\.\pipe\python-pipe-{:d}-{:d}-'.format(
+            os.getpid(), next(_mmap_counter)))
+
+    if duplex:
+        openmode = _winapi.PIPE_ACCESS_DUPLEX
+        access = _winapi.GENERIC_READ | _winapi.GENERIC_WRITE
+        obsize, ibsize = bufsize, bufsize
+    else:
+        openmode = _winapi.PIPE_ACCESS_INBOUND
+        access = _winapi.GENERIC_WRITE
+        obsize, ibsize = 0, bufsize
+
+    openmode |= _winapi.FILE_FLAG_FIRST_PIPE_INSTANCE
+
+    if overlapped[0]:
+        openmode |= _winapi.FILE_FLAG_OVERLAPPED
+
+    if overlapped[1]:
+        flags_and_attribs = _winapi.FILE_FLAG_OVERLAPPED
+    else:
+        flags_and_attribs = 0
+
+    h1 = h2 = None
+    try:
+        h1 = _winapi.CreateNamedPipe(
+            address, openmode, _winapi.PIPE_WAIT,
+            1, obsize, ibsize, _winapi.NMPWAIT_WAIT_FOREVER, _winapi.NULL)
+
+        h2 = _winapi.CreateFile(
+            address, access, 0, _winapi.NULL, _winapi.OPEN_EXISTING,
+            flags_and_attribs, _winapi.NULL)
+
+        ov = _winapi.ConnectNamedPipe(h1, overlapped=True)
+        ov.GetOverlappedResult(True)
+        return h1, h2
+    except:
+        if h1 is not None:
+            _winapi.CloseHandle(h1)
+        if h2 is not None:
+            _winapi.CloseHandle(h2)
+        raise
+
+
+# Wrapper for a pipe handle
+
+
+class PipeHandle:
+    """Wrapper for an overlapped pipe handle which is vaguely file-object like.
+
+    The IOCP event loop can use these instead of socket objects.
+    """
+    def __init__(self, handle):
+        self._handle = handle
+
+    def __repr__(self):
+        if self._handle is not None:
+            handle = f'handle={self._handle!r}'
+        else:
+            handle = 'closed'
+        return f'<{self.__class__.__name__} {handle}>'
+
+    @property
+    def handle(self):
+        return self._handle
+
+    def fileno(self):
+        if self._handle is None:
+            raise ValueError("I/O operation on closed pipe")
+        return self._handle
+
+    def close(self, *, CloseHandle=_winapi.CloseHandle):
+        if self._handle is not None:
+            CloseHandle(self._handle)
+            self._handle = None
+
+    def __del__(self, _warn=warnings.warn):
+        if self._handle is not None:
+            _warn(f"unclosed {self!r}", ResourceWarning, source=self)
+            self.close()
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, t, v, tb):
+        self.close()
+
+
+# Replacement for subprocess.Popen using overlapped pipe handles
+
+
+class Popen(subprocess.Popen):
+    """Replacement for subprocess.Popen using overlapped pipe handles.
+
+    The stdin, stdout, stderr are None or instances of PipeHandle.
+    """
+    def __init__(self, args, stdin=None, stdout=None, stderr=None, **kwds):
+        assert not kwds.get('universal_newlines')
+        assert kwds.get('bufsize', 0) == 0
+        stdin_rfd = stdout_wfd = stderr_wfd = None
+        stdin_wh = stdout_rh = stderr_rh = None
+        if stdin == PIPE:
+            stdin_rh, stdin_wh = pipe(overlapped=(False, True), duplex=True)
+            stdin_rfd = msvcrt.open_osfhandle(stdin_rh, os.O_RDONLY)
+        else:
+            stdin_rfd = stdin
+        if stdout == PIPE:
+            stdout_rh, stdout_wh = pipe(overlapped=(True, False))
+            stdout_wfd = msvcrt.open_osfhandle(stdout_wh, 0)
+        else:
+            stdout_wfd = stdout
+        if stderr == PIPE:
+            stderr_rh, stderr_wh = pipe(overlapped=(True, False))
+            stderr_wfd = msvcrt.open_osfhandle(stderr_wh, 0)
+        elif stderr == STDOUT:
+            stderr_wfd = stdout_wfd
+        else:
+            stderr_wfd = stderr
+        try:
+            super().__init__(args, stdin=stdin_rfd, stdout=stdout_wfd,
+                             stderr=stderr_wfd, **kwds)
+        except:
+            for h in (stdin_wh, stdout_rh, stderr_rh):
+                if h is not None:
+                    _winapi.CloseHandle(h)
+            raise
+        else:
+            if stdin_wh is not None:
+                self.stdin = PipeHandle(stdin_wh)
+            if stdout_rh is not None:
+                self.stdout = PipeHandle(stdout_rh)
+            if stderr_rh is not None:
+                self.stderr = PipeHandle(stderr_rh)
+        finally:
+            if stdin == PIPE:
+                os.close(stdin_rfd)
+            if stdout == PIPE:
+                os.close(stdout_wfd)
+            if stderr == PIPE:
+                os.close(stderr_wfd)

janus/lib/python3.10/site-packages/idna-3.10.dist-info/INSTALLER

@@ -0,0 +1 @@
+pip

janus/lib/python3.10/site-packages/idna-3.10.dist-info/LICENSE.md

@@ -0,0 +1,31 @@
+BSD 3-Clause License
+
+Copyright (c) 2013-2024, Kim Davies and contributors.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

janus/lib/python3.10/site-packages/idna-3.10.dist-info/METADATA

@@ -0,0 +1,250 @@
+Metadata-Version: 2.1
+Name: idna
+Version: 3.10
+Summary: Internationalized Domain Names in Applications (IDNA)
+Author-email: Kim Davies <kim+pypi@gumleaf.org>
+Requires-Python: >=3.6
+Description-Content-Type: text/x-rst
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Intended Audience :: Developers
+Classifier: Intended Audience :: System Administrators
+Classifier: License :: OSI Approved :: BSD License
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3 :: Only
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Classifier: Programming Language :: Python :: 3.8
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: 3.13
+Classifier: Programming Language :: Python :: Implementation :: CPython
+Classifier: Programming Language :: Python :: Implementation :: PyPy
+Classifier: Topic :: Internet :: Name Service (DNS)
+Classifier: Topic :: Software Development :: Libraries :: Python Modules
+Classifier: Topic :: Utilities
+Requires-Dist: ruff >= 0.6.2 ; extra == "all"
+Requires-Dist: mypy >= 1.11.2 ; extra == "all"
+Requires-Dist: pytest >= 8.3.2 ; extra == "all"
+Requires-Dist: flake8 >= 7.1.1 ; extra == "all"
+Project-URL: Changelog, https://github.com/kjd/idna/blob/master/HISTORY.rst
+Project-URL: Issue tracker, https://github.com/kjd/idna/issues
+Project-URL: Source, https://github.com/kjd/idna
+Provides-Extra: all
+
+Internationalized Domain Names in Applications (IDNA)
+=====================================================
+
+Support for the Internationalized Domain Names in
+Applications (IDNA) protocol as specified in `RFC 5891
+<https://tools.ietf.org/html/rfc5891>`_. This is the latest version of
+the protocol and is sometimes referred to as “IDNA 2008”.
+
+This library also provides support for Unicode Technical
+Standard 46, `Unicode IDNA Compatibility Processing
+<https://unicode.org/reports/tr46/>`_.
+
+This acts as a suitable replacement for the “encodings.idna”
+module that comes with the Python standard library, but which
+only supports the older superseded IDNA specification (`RFC 3490
+<https://tools.ietf.org/html/rfc3490>`_).
+
+Basic functions are simply executed:
+
+.. code-block:: pycon
+
+    >>> import idna
+    >>> idna.encode('ドメイン.テスト')
+    b'xn--eckwd4c7c.xn--zckzah'
+    >>> print(idna.decode('xn--eckwd4c7c.xn--zckzah'))
+    ドメイン.テスト
+
+
+Installation
+------------
+
+This package is available for installation from PyPI:
+
+.. code-block:: bash
+
+    $ python3 -m pip install idna
+
+
+Usage
+-----
+
+For typical usage, the ``encode`` and ``decode`` functions will take a
+domain name argument and perform a conversion to A-labels or U-labels
+respectively.
+
+.. code-block:: pycon
+
+    >>> import idna
+    >>> idna.encode('ドメイン.テスト')
+    b'xn--eckwd4c7c.xn--zckzah'
+    >>> print(idna.decode('xn--eckwd4c7c.xn--zckzah'))
+    ドメイン.テスト
+
+You may use the codec encoding and decoding methods using the
+``idna.codec`` module:
+
+.. code-block:: pycon
+
+    >>> import idna.codec
+    >>> print('домен.испытание'.encode('idna2008'))
+    b'xn--d1acufc.xn--80akhbyknj4f'
+    >>> print(b'xn--d1acufc.xn--80akhbyknj4f'.decode('idna2008'))
+    домен.испытание
+
+Conversions can be applied at a per-label basis using the ``ulabel`` or
+``alabel`` functions if necessary:
+
+.. code-block:: pycon
+
+    >>> idna.alabel('测试')
+    b'xn--0zwm56d'
+
+Compatibility Mapping (UTS #46)
++++++++++++++++++++++++++++++++
+
+As described in `RFC 5895 <https://tools.ietf.org/html/rfc5895>`_, the
+IDNA specification does not normalize input from different potential
+ways a user may input a domain name. This functionality, known as
+a “mapping”, is considered by the specification to be a local
+user-interface issue distinct from IDNA conversion functionality.
+
+This library provides one such mapping that was developed by the
+Unicode Consortium. Known as `Unicode IDNA Compatibility Processing
+<https://unicode.org/reports/tr46/>`_, it provides for both a regular
+mapping for typical applications, as well as a transitional mapping to
+help migrate from older IDNA 2003 applications. Strings are
+preprocessed according to Section 4.4 “Preprocessing for IDNA2008”
+prior to the IDNA operations.
+
+For example, “Königsgäßchen” is not a permissible label as *LATIN
+CAPITAL LETTER K* is not allowed (nor are capital letters in general).
+UTS 46 will convert this into lower case prior to applying the IDNA
+conversion.
+
+.. code-block:: pycon
+
+    >>> import idna
+    >>> idna.encode('Königsgäßchen')
+    ...
+    idna.core.InvalidCodepoint: Codepoint U+004B at position 1 of 'Königsgäßchen' not allowed
+    >>> idna.encode('Königsgäßchen', uts46=True)
+    b'xn--knigsgchen-b4a3dun'
+    >>> print(idna.decode('xn--knigsgchen-b4a3dun'))
+    königsgäßchen
+
+Transitional processing provides conversions to help transition from
+the older 2003 standard to the current standard. For example, in the
+original IDNA specification, the *LATIN SMALL LETTER SHARP S* (ß) was
+converted into two *LATIN SMALL LETTER S* (ss), whereas in the current
+IDNA specification this conversion is not performed.
+
+.. code-block:: pycon
+
+    >>> idna.encode('Königsgäßchen', uts46=True, transitional=True)
+    'xn--knigsgsschen-lcb0w'
+
+Implementers should use transitional processing with caution, only in
+rare cases where conversion from legacy labels to current labels must be
+performed (i.e. IDNA implementations that pre-date 2008). For typical
+applications that just need to convert labels, transitional processing
+is unlikely to be beneficial and could produce unexpected incompatible
+results.
+
+``encodings.idna`` Compatibility
+++++++++++++++++++++++++++++++++
+
+Function calls from the Python built-in ``encodings.idna`` module are
+mapped to their IDNA 2008 equivalents using the ``idna.compat`` module.
+Simply substitute the ``import`` clause in your code to refer to the new
+module name.
+
+Exceptions
+----------
+
+All errors raised during the conversion following the specification
+should raise an exception derived from the ``idna.IDNAError`` base
+class.
+
+More specific exceptions that may be generated as ``idna.IDNABidiError``
+when the error reflects an illegal combination of left-to-right and
+right-to-left characters in a label; ``idna.InvalidCodepoint`` when
+a specific codepoint is an illegal character in an IDN label (i.e.
+INVALID); and ``idna.InvalidCodepointContext`` when the codepoint is
+illegal based on its positional context (i.e. it is CONTEXTO or CONTEXTJ
+but the contextual requirements are not satisfied.)
+
+Building and Diagnostics
+------------------------
+
+The IDNA and UTS 46 functionality relies upon pre-calculated lookup
+tables for performance. These tables are derived from computing against
+eligibility criteria in the respective standards. These tables are
+computed using the command-line script ``tools/idna-data``.
+
+This tool will fetch relevant codepoint data from the Unicode repository
+and perform the required calculations to identify eligibility. There are
+three main modes:
+
+* ``idna-data make-libdata``. Generates ``idnadata.py`` and
+  ``uts46data.py``, the pre-calculated lookup tables used for IDNA and
+  UTS 46 conversions. Implementers who wish to track this library against
+  a different Unicode version may use this tool to manually generate a
+  different version of the ``idnadata.py`` and ``uts46data.py`` files.
+
+* ``idna-data make-table``. Generate a table of the IDNA disposition
+  (e.g. PVALID, CONTEXTJ, CONTEXTO) in the format found in Appendix
+  B.1 of RFC 5892 and the pre-computed tables published by `IANA
+  <https://www.iana.org/>`_.
+
+* ``idna-data U+0061``. Prints debugging output on the various
+  properties associated with an individual Unicode codepoint (in this
+  case, U+0061), that are used to assess the IDNA and UTS 46 status of a
+  codepoint. This is helpful in debugging or analysis.
+
+The tool accepts a number of arguments, described using ``idna-data
+-h``. Most notably, the ``--version`` argument allows the specification
+of the version of Unicode to be used in computing the table data. For
+example, ``idna-data --version 9.0.0 make-libdata`` will generate
+library data against Unicode 9.0.0.
+
+
+Additional Notes
+----------------
+
+* **Packages**. The latest tagged release version is published in the
+  `Python Package Index <https://pypi.org/project/idna/>`_.
+
+* **Version support**. This library supports Python 3.6 and higher.
+  As this library serves as a low-level toolkit for a variety of
+  applications, many of which strive for broad compatibility with older
+  Python versions, there is no rush to remove older interpreter support.
+  Removing support for older versions should be well justified in that the
+  maintenance burden has become too high.
+
+* **Python 2**. Python 2 is supported by version 2.x of this library.
+  Use "idna<3" in your requirements file if you need this library for
+  a Python 2 application. Be advised that these versions are no longer
+  actively developed.
+
+* **Testing**. The library has a test suite based on each rule of the
+  IDNA specification, as well as tests that are provided as part of the
+  Unicode Technical Standard 46, `Unicode IDNA Compatibility Processing
+  <https://unicode.org/reports/tr46/>`_.
+
+* **Emoji**. It is an occasional request to support emoji domains in
+  this library. Encoding of symbols like emoji is expressly prohibited by
+  the technical standard IDNA 2008 and emoji domains are broadly phased
+  out across the domain industry due to associated security risks. For
+  now, applications that need to support these non-compliant labels
+  may wish to consider trying the encode/decode operation in this library
+  first, and then falling back to using `encodings.idna`. See `the Github
+  project <https://github.com/kjd/idna/issues/18>`_ for more discussion.
+

janus/lib/python3.10/site-packages/jinja2/async_utils.py

@@ -0,0 +1,99 @@
+import inspect
+import typing as t
+from functools import WRAPPER_ASSIGNMENTS
+from functools import wraps
+
+from .utils import _PassArg
+from .utils import pass_eval_context
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+
+V = t.TypeVar("V")
+
+
+def async_variant(normal_func):  # type: ignore
+    def decorator(async_func):  # type: ignore
+        pass_arg = _PassArg.from_obj(normal_func)
+        need_eval_context = pass_arg is None
+
+        if pass_arg is _PassArg.environment:
+
+            def is_async(args: t.Any) -> bool:
+                return t.cast(bool, args[0].is_async)
+
+        else:
+
+            def is_async(args: t.Any) -> bool:
+                return t.cast(bool, args[0].environment.is_async)
+
+        # Take the doc and annotations from the sync function, but the
+        # name from the async function. Pallets-Sphinx-Themes
+        # build_function_directive expects __wrapped__ to point to the
+        # sync function.
+        async_func_attrs = ("__module__", "__name__", "__qualname__")
+        normal_func_attrs = tuple(set(WRAPPER_ASSIGNMENTS).difference(async_func_attrs))
+
+        @wraps(normal_func, assigned=normal_func_attrs)
+        @wraps(async_func, assigned=async_func_attrs, updated=())
+        def wrapper(*args, **kwargs):  # type: ignore
+            b = is_async(args)
+
+            if need_eval_context:
+                args = args[1:]
+
+            if b:
+                return async_func(*args, **kwargs)
+
+            return normal_func(*args, **kwargs)
+
+        if need_eval_context:
+            wrapper = pass_eval_context(wrapper)
+
+        wrapper.jinja_async_variant = True  # type: ignore[attr-defined]
+        return wrapper
+
+    return decorator
+
+
+_common_primitives = {int, float, bool, str, list, dict, tuple, type(None)}
+
+
+async def auto_await(value: t.Union[t.Awaitable["V"], "V"]) -> "V":
+    # Avoid a costly call to isawaitable
+    if type(value) in _common_primitives:
+        return t.cast("V", value)
+
+    if inspect.isawaitable(value):
+        return await t.cast("t.Awaitable[V]", value)
+
+    return value
+
+
+class _IteratorToAsyncIterator(t.Generic[V]):
+    def __init__(self, iterator: "t.Iterator[V]"):
+        self._iterator = iterator
+
+    def __aiter__(self) -> "te.Self":
+        return self
+
+    async def __anext__(self) -> V:
+        try:
+            return next(self._iterator)
+        except StopIteration as e:
+            raise StopAsyncIteration(e.value) from e
+
+
+def auto_aiter(
+    iterable: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+) -> "t.AsyncIterator[V]":
+    if hasattr(iterable, "__aiter__"):
+        return iterable.__aiter__()
+    else:
+        return _IteratorToAsyncIterator(iter(iterable))
+
+
+async def auto_to_list(
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+) -> t.List["V"]:
+    return [x async for x in auto_aiter(value)]

janus/lib/python3.10/site-packages/jinja2/filters.py

@@ -0,0 +1,1878 @@
+"""Built-in template filters used with the ``|`` operator."""
+
+import math
+import random
+import re
+import typing
+import typing as t
+from collections import abc
+from itertools import chain
+from itertools import groupby
+
+from markupsafe import escape
+from markupsafe import Markup
+from markupsafe import soft_str
+
+from .async_utils import async_variant
+from .async_utils import auto_aiter
+from .async_utils import auto_await
+from .async_utils import auto_to_list
+from .exceptions import FilterArgumentError
+from .runtime import Undefined
+from .utils import htmlsafe_json_dumps
+from .utils import pass_context
+from .utils import pass_environment
+from .utils import pass_eval_context
+from .utils import pformat
+from .utils import url_quote
+from .utils import urlize
+
+if t.TYPE_CHECKING:
+    import typing_extensions as te
+
+    from .environment import Environment
+    from .nodes import EvalContext
+    from .runtime import Context
+    from .sandbox import SandboxedEnvironment  # noqa: F401
+
+    class HasHTML(te.Protocol):
+        def __html__(self) -> str:
+            pass
+
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+K = t.TypeVar("K")
+V = t.TypeVar("V")
+
+
+def ignore_case(value: V) -> V:
+    """For use as a postprocessor for :func:`make_attrgetter`. Converts strings
+    to lowercase and returns other types as-is."""
+    if isinstance(value, str):
+        return t.cast(V, value.lower())
+
+    return value
+
+
+def make_attrgetter(
+    environment: "Environment",
+    attribute: t.Optional[t.Union[str, int]],
+    postprocess: t.Optional[t.Callable[[t.Any], t.Any]] = None,
+    default: t.Optional[t.Any] = None,
+) -> t.Callable[[t.Any], t.Any]:
+    """Returns a callable that looks up the given attribute from a
+    passed object with the rules of the environment.  Dots are allowed
+    to access attributes of attributes.  Integer parts in paths are
+    looked up as integers.
+    """
+    parts = _prepare_attribute_parts(attribute)
+
+    def attrgetter(item: t.Any) -> t.Any:
+        for part in parts:
+            item = environment.getitem(item, part)
+
+            if default is not None and isinstance(item, Undefined):
+                item = default
+
+        if postprocess is not None:
+            item = postprocess(item)
+
+        return item
+
+    return attrgetter
+
+
+def make_multi_attrgetter(
+    environment: "Environment",
+    attribute: t.Optional[t.Union[str, int]],
+    postprocess: t.Optional[t.Callable[[t.Any], t.Any]] = None,
+) -> t.Callable[[t.Any], t.List[t.Any]]:
+    """Returns a callable that looks up the given comma separated
+    attributes from a passed object with the rules of the environment.
+    Dots are allowed to access attributes of each attribute.  Integer
+    parts in paths are looked up as integers.
+
+    The value returned by the returned callable is a list of extracted
+    attribute values.
+
+    Examples of attribute: "attr1,attr2", "attr1.inner1.0,attr2.inner2.0", etc.
+    """
+    if isinstance(attribute, str):
+        split: t.Sequence[t.Union[str, int, None]] = attribute.split(",")
+    else:
+        split = [attribute]
+
+    parts = [_prepare_attribute_parts(item) for item in split]
+
+    def attrgetter(item: t.Any) -> t.List[t.Any]:
+        items = [None] * len(parts)
+
+        for i, attribute_part in enumerate(parts):
+            item_i = item
+
+            for part in attribute_part:
+                item_i = environment.getitem(item_i, part)
+
+            if postprocess is not None:
+                item_i = postprocess(item_i)
+
+            items[i] = item_i
+
+        return items
+
+    return attrgetter
+
+
+def _prepare_attribute_parts(
+    attr: t.Optional[t.Union[str, int]],
+) -> t.List[t.Union[str, int]]:
+    if attr is None:
+        return []
+
+    if isinstance(attr, str):
+        return [int(x) if x.isdigit() else x for x in attr.split(".")]
+
+    return [attr]
+
+
+def do_forceescape(value: "t.Union[str, HasHTML]") -> Markup:
+    """Enforce HTML escaping.  This will probably double escape variables."""
+    if hasattr(value, "__html__"):
+        value = t.cast("HasHTML", value).__html__()
+
+    return escape(str(value))
+
+
+def do_urlencode(
+    value: t.Union[str, t.Mapping[str, t.Any], t.Iterable[t.Tuple[str, t.Any]]],
+) -> str:
+    """Quote data for use in a URL path or query using UTF-8.
+
+    Basic wrapper around :func:`urllib.parse.quote` when given a
+    string, or :func:`urllib.parse.urlencode` for a dict or iterable.
+
+    :param value: Data to quote. A string will be quoted directly. A
+        dict or iterable of ``(key, value)`` pairs will be joined as a
+        query string.
+
+    When given a string, "/" is not quoted. HTTP servers treat "/" and
+    "%2F" equivalently in paths. If you need quoted slashes, use the
+    ``|replace("/", "%2F")`` filter.
+
+    .. versionadded:: 2.7
+    """
+    if isinstance(value, str) or not isinstance(value, abc.Iterable):
+        return url_quote(value)
+
+    if isinstance(value, dict):
+        items: t.Iterable[t.Tuple[str, t.Any]] = value.items()
+    else:
+        items = value  # type: ignore
+
+    return "&".join(
+        f"{url_quote(k, for_qs=True)}={url_quote(v, for_qs=True)}" for k, v in items
+    )
+
+
+@pass_eval_context
+def do_replace(
+    eval_ctx: "EvalContext", s: str, old: str, new: str, count: t.Optional[int] = None
+) -> str:
+    """Return a copy of the value with all occurrences of a substring
+    replaced with a new one. The first argument is the substring
+    that should be replaced, the second is the replacement string.
+    If the optional third argument ``count`` is given, only the first
+    ``count`` occurrences are replaced:
+
+    .. sourcecode:: jinja
+
+        {{ "Hello World"|replace("Hello", "Goodbye") }}
+            -> Goodbye World
+
+        {{ "aaaaargh"|replace("a", "d'oh, ", 2) }}
+            -> d'oh, d'oh, aaargh
+    """
+    if count is None:
+        count = -1
+
+    if not eval_ctx.autoescape:
+        return str(s).replace(str(old), str(new), count)
+
+    if (
+        hasattr(old, "__html__")
+        or hasattr(new, "__html__")
+        and not hasattr(s, "__html__")
+    ):
+        s = escape(s)
+    else:
+        s = soft_str(s)
+
+    return s.replace(soft_str(old), soft_str(new), count)
+
+
+def do_upper(s: str) -> str:
+    """Convert a value to uppercase."""
+    return soft_str(s).upper()
+
+
+def do_lower(s: str) -> str:
+    """Convert a value to lowercase."""
+    return soft_str(s).lower()
+
+
+def do_items(value: t.Union[t.Mapping[K, V], Undefined]) -> t.Iterator[t.Tuple[K, V]]:
+    """Return an iterator over the ``(key, value)`` items of a mapping.
+
+    ``x|items`` is the same as ``x.items()``, except if ``x`` is
+    undefined an empty iterator is returned.
+
+    This filter is useful if you expect the template to be rendered with
+    an implementation of Jinja in another programming language that does
+    not have a ``.items()`` method on its mapping type.
+
+    .. code-block:: html+jinja
+
+        <dl>
+        {% for key, value in my_dict|items %}
+            <dt>{{ key }}
+            <dd>{{ value }}
+        {% endfor %}
+        </dl>
+
+    .. versionadded:: 3.1
+    """
+    if isinstance(value, Undefined):
+        return
+
+    if not isinstance(value, abc.Mapping):
+        raise TypeError("Can only get item pairs from a mapping.")
+
+    yield from value.items()
+
+
+# Check for characters that would move the parser state from key to value.
+# https://html.spec.whatwg.org/#attribute-name-state
+_attr_key_re = re.compile(r"[\s/>=]", flags=re.ASCII)
+
+
+@pass_eval_context
+def do_xmlattr(
+    eval_ctx: "EvalContext", d: t.Mapping[str, t.Any], autospace: bool = True
+) -> str:
+    """Create an SGML/XML attribute string based on the items in a dict.
+
+    **Values** that are neither ``none`` nor ``undefined`` are automatically
+    escaped, safely allowing untrusted user input.
+
+    User input should not be used as **keys** to this filter. If any key
+    contains a space, ``/`` solidus, ``>`` greater-than sign, or ``=`` equals
+    sign, this fails with a ``ValueError``. Regardless of this, user input
+    should never be used as keys to this filter, or must be separately validated
+    first.
+
+    .. sourcecode:: html+jinja
+
+        <ul{{ {'class': 'my_list', 'missing': none,
+                'id': 'list-%d'|format(variable)}|xmlattr }}>
+        ...
+        </ul>
+
+    Results in something like this:
+
+    .. sourcecode:: html
+
+        <ul class="my_list" id="list-42">
+        ...
+        </ul>
+
+    As you can see it automatically prepends a space in front of the item
+    if the filter returned something unless the second parameter is false.
+
+    .. versionchanged:: 3.1.4
+        Keys with ``/`` solidus, ``>`` greater-than sign, or ``=`` equals sign
+        are not allowed.
+
+    .. versionchanged:: 3.1.3
+        Keys with spaces are not allowed.
+    """
+    items = []
+
+    for key, value in d.items():
+        if value is None or isinstance(value, Undefined):
+            continue
+
+        if _attr_key_re.search(key) is not None:
+            raise ValueError(f"Invalid character in attribute name: {key!r}")
+
+        items.append(f'{escape(key)}="{escape(value)}"')
+
+    rv = " ".join(items)
+
+    if autospace and rv:
+        rv = " " + rv
+
+    if eval_ctx.autoescape:
+        rv = Markup(rv)
+
+    return rv
+
+
+def do_capitalize(s: str) -> str:
+    """Capitalize a value. The first character will be uppercase, all others
+    lowercase.
+    """
+    return soft_str(s).capitalize()
+
+
+_word_beginning_split_re = re.compile(r"([-\s({\[<]+)")
+
+
+def do_title(s: str) -> str:
+    """Return a titlecased version of the value. I.e. words will start with
+    uppercase letters, all remaining characters are lowercase.
+    """
+    return "".join(
+        [
+            item[0].upper() + item[1:].lower()
+            for item in _word_beginning_split_re.split(soft_str(s))
+            if item
+        ]
+    )
+
+
+def do_dictsort(
+    value: t.Mapping[K, V],
+    case_sensitive: bool = False,
+    by: 'te.Literal["key", "value"]' = "key",
+    reverse: bool = False,
+) -> t.List[t.Tuple[K, V]]:
+    """Sort a dict and yield (key, value) pairs. Python dicts may not
+    be in the order you want to display them in, so sort them first.
+
+    .. sourcecode:: jinja
+
+        {% for key, value in mydict|dictsort %}
+            sort the dict by key, case insensitive
+
+        {% for key, value in mydict|dictsort(reverse=true) %}
+            sort the dict by key, case insensitive, reverse order
+
+        {% for key, value in mydict|dictsort(true) %}
+            sort the dict by key, case sensitive
+
+        {% for key, value in mydict|dictsort(false, 'value') %}
+            sort the dict by value, case insensitive
+    """
+    if by == "key":
+        pos = 0
+    elif by == "value":
+        pos = 1
+    else:
+        raise FilterArgumentError('You can only sort by either "key" or "value"')
+
+    def sort_func(item: t.Tuple[t.Any, t.Any]) -> t.Any:
+        value = item[pos]
+
+        if not case_sensitive:
+            value = ignore_case(value)
+
+        return value
+
+    return sorted(value.items(), key=sort_func, reverse=reverse)
+
+
+@pass_environment
+def do_sort(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    reverse: bool = False,
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.List[V]":
+    """Sort an iterable using Python's :func:`sorted`.
+
+    .. sourcecode:: jinja
+
+        {% for city in cities|sort %}
+            ...
+        {% endfor %}
+
+    :param reverse: Sort descending instead of ascending.
+    :param case_sensitive: When sorting strings, sort upper and lower
+        case separately.
+    :param attribute: When sorting objects or dicts, an attribute or
+        key to sort by. Can use dot notation like ``"address.city"``.
+        Can be a list of attributes like ``"age,name"``.
+
+    The sort is stable, it does not change the relative order of
+    elements that compare equal. This makes it is possible to chain
+    sorts on different attributes and ordering.
+
+    .. sourcecode:: jinja
+
+        {% for user in users|sort(attribute="name")
+            |sort(reverse=true, attribute="age") %}
+            ...
+        {% endfor %}
+
+    As a shortcut to chaining when the direction is the same for all
+    attributes, pass a comma separate list of attributes.
+
+    .. sourcecode:: jinja
+
+        {% for user in users|sort(attribute="age,name") %}
+            ...
+        {% endfor %}
+
+    .. versionchanged:: 2.11.0
+        The ``attribute`` parameter can be a comma separated list of
+        attributes, e.g. ``"age,name"``.
+
+    .. versionchanged:: 2.6
+       The ``attribute`` parameter was added.
+    """
+    key_func = make_multi_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    return sorted(value, key=key_func, reverse=reverse)
+
+
+@pass_environment
+def sync_do_unique(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Iterator[V]":
+    """Returns a list of unique items from the given iterable.
+
+    .. sourcecode:: jinja
+
+        {{ ['foo', 'bar', 'foobar', 'FooBar']|unique|list }}
+            -> ['foo', 'bar', 'foobar']
+
+    The unique items are yielded in the same order as their first occurrence in
+    the iterable passed to the filter.
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Filter objects with unique values for this attribute.
+    """
+    getter = make_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    seen = set()
+
+    for item in value:
+        key = getter(item)
+
+        if key not in seen:
+            seen.add(key)
+            yield item
+
+
+@async_variant(sync_do_unique)  # type: ignore
+async def do_unique(
+    environment: "Environment",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Iterator[V]":
+    return sync_do_unique(
+        environment, await auto_to_list(value), case_sensitive, attribute
+    )
+
+
+def _min_or_max(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    func: "t.Callable[..., V]",
+    case_sensitive: bool,
+    attribute: t.Optional[t.Union[str, int]],
+) -> "t.Union[V, Undefined]":
+    it = iter(value)
+
+    try:
+        first = next(it)
+    except StopIteration:
+        return environment.undefined("No aggregated item, sequence was empty.")
+
+    key_func = make_attrgetter(
+        environment, attribute, postprocess=ignore_case if not case_sensitive else None
+    )
+    return func(chain([first], it), key=key_func)
+
+
+@pass_environment
+def do_min(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Union[V, Undefined]":
+    """Return the smallest item from the sequence.
+
+    .. sourcecode:: jinja
+
+        {{ [1, 2, 3]|min }}
+            -> 1
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Get the object with the min value of this attribute.
+    """
+    return _min_or_max(environment, value, min, case_sensitive, attribute)
+
+
+@pass_environment
+def do_max(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    case_sensitive: bool = False,
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> "t.Union[V, Undefined]":
+    """Return the largest item from the sequence.
+
+    .. sourcecode:: jinja
+
+        {{ [1, 2, 3]|max }}
+            -> 3
+
+    :param case_sensitive: Treat upper and lower case strings as distinct.
+    :param attribute: Get the object with the max value of this attribute.
+    """
+    return _min_or_max(environment, value, max, case_sensitive, attribute)
+
+
+def do_default(
+    value: V,
+    default_value: V = "",  # type: ignore
+    boolean: bool = False,
+) -> V:
+    """If the value is undefined it will return the passed default value,
+    otherwise the value of the variable:
+
+    .. sourcecode:: jinja
+
+        {{ my_variable|default('my_variable is not defined') }}
+
+    This will output the value of ``my_variable`` if the variable was
+    defined, otherwise ``'my_variable is not defined'``. If you want
+    to use default with variables that evaluate to false you have to
+    set the second parameter to `true`:
+
+    .. sourcecode:: jinja
+
+        {{ ''|default('the string was empty', true) }}
+
+    .. versionchanged:: 2.11
+       It's now possible to configure the :class:`~jinja2.Environment` with
+       :class:`~jinja2.ChainableUndefined` to make the `default` filter work
+       on nested elements and attributes that may contain undefined values
+       in the chain without getting an :exc:`~jinja2.UndefinedError`.
+    """
+    if isinstance(value, Undefined) or (boolean and not value):
+        return default_value
+
+    return value
+
+
+@pass_eval_context
+def sync_do_join(
+    eval_ctx: "EvalContext",
+    value: t.Iterable[t.Any],
+    d: str = "",
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> str:
+    """Return a string which is the concatenation of the strings in the
+    sequence. The separator between elements is an empty string per
+    default, you can define it with the optional parameter:
+
+    .. sourcecode:: jinja
+
+        {{ [1, 2, 3]|join('|') }}
+            -> 1|2|3
+
+        {{ [1, 2, 3]|join }}
+            -> 123
+
+    It is also possible to join certain attributes of an object:
+
+    .. sourcecode:: jinja
+
+        {{ users|join(', ', attribute='username') }}
+
+    .. versionadded:: 2.6
+       The `attribute` parameter was added.
+    """
+    if attribute is not None:
+        value = map(make_attrgetter(eval_ctx.environment, attribute), value)
+
+    # no automatic escaping?  joining is a lot easier then
+    if not eval_ctx.autoescape:
+        return str(d).join(map(str, value))
+
+    # if the delimiter doesn't have an html representation we check
+    # if any of the items has.  If yes we do a coercion to Markup
+    if not hasattr(d, "__html__"):
+        value = list(value)
+        do_escape = False
+
+        for idx, item in enumerate(value):
+            if hasattr(item, "__html__"):
+                do_escape = True
+            else:
+                value[idx] = str(item)
+
+        if do_escape:
+            d = escape(d)
+        else:
+            d = str(d)
+
+        return d.join(value)
+
+    # no html involved, to normal joining
+    return soft_str(d).join(map(soft_str, value))
+
+
+@async_variant(sync_do_join)  # type: ignore
+async def do_join(
+    eval_ctx: "EvalContext",
+    value: t.Union[t.AsyncIterable[t.Any], t.Iterable[t.Any]],
+    d: str = "",
+    attribute: t.Optional[t.Union[str, int]] = None,
+) -> str:
+    return sync_do_join(eval_ctx, await auto_to_list(value), d, attribute)
+
+
+def do_center(value: str, width: int = 80) -> str:
+    """Centers the value in a field of a given width."""
+    return soft_str(value).center(width)
+
+
+@pass_environment
+def sync_do_first(
+    environment: "Environment", seq: "t.Iterable[V]"
+) -> "t.Union[V, Undefined]":
+    """Return the first item of a sequence."""
+    try:
+        return next(iter(seq))
+    except StopIteration:
+        return environment.undefined("No first item, sequence was empty.")
+
+
+@async_variant(sync_do_first)  # type: ignore
+async def do_first(
+    environment: "Environment", seq: "t.Union[t.AsyncIterable[V], t.Iterable[V]]"
+) -> "t.Union[V, Undefined]":
+    try:
+        return await auto_aiter(seq).__anext__()
+    except StopAsyncIteration:
+        return environment.undefined("No first item, sequence was empty.")
+
+
+@pass_environment
+def do_last(
+    environment: "Environment", seq: "t.Reversible[V]"
+) -> "t.Union[V, Undefined]":
+    """Return the last item of a sequence.
+
+    Note: Does not work with generators. You may want to explicitly
+    convert it to a list:
+
+    .. sourcecode:: jinja
+
+        {{ data | selectattr('name', '==', 'Jinja') | list | last }}
+    """
+    try:
+        return next(iter(reversed(seq)))
+    except StopIteration:
+        return environment.undefined("No last item, sequence was empty.")
+
+
+# No async do_last, it may not be safe in async mode.
+
+
+@pass_context
+def do_random(context: "Context", seq: "t.Sequence[V]") -> "t.Union[V, Undefined]":
+    """Return a random item from the sequence."""
+    try:
+        return random.choice(seq)
+    except IndexError:
+        return context.environment.undefined("No random item, sequence was empty.")
+
+
+def do_filesizeformat(value: t.Union[str, float, int], binary: bool = False) -> str:
+    """Format the value like a 'human-readable' file size (i.e. 13 kB,
+    4.1 MB, 102 Bytes, etc).  Per default decimal prefixes are used (Mega,
+    Giga, etc.), if the second parameter is set to `True` the binary
+    prefixes are used (Mebi, Gibi).
+    """
+    bytes = float(value)
+    base = 1024 if binary else 1000
+    prefixes = [
+        ("KiB" if binary else "kB"),
+        ("MiB" if binary else "MB"),
+        ("GiB" if binary else "GB"),
+        ("TiB" if binary else "TB"),
+        ("PiB" if binary else "PB"),
+        ("EiB" if binary else "EB"),
+        ("ZiB" if binary else "ZB"),
+        ("YiB" if binary else "YB"),
+    ]
+
+    if bytes == 1:
+        return "1 Byte"
+    elif bytes < base:
+        return f"{int(bytes)} Bytes"
+    else:
+        for i, prefix in enumerate(prefixes):
+            unit = base ** (i + 2)
+
+            if bytes < unit:
+                return f"{base * bytes / unit:.1f} {prefix}"
+
+        return f"{base * bytes / unit:.1f} {prefix}"
+
+
+def do_pprint(value: t.Any) -> str:
+    """Pretty print a variable. Useful for debugging."""
+    return pformat(value)
+
+
+_uri_scheme_re = re.compile(r"^([\w.+-]{2,}:(/){0,2})$")
+
+
+@pass_eval_context
+def do_urlize(
+    eval_ctx: "EvalContext",
+    value: str,
+    trim_url_limit: t.Optional[int] = None,
+    nofollow: bool = False,
+    target: t.Optional[str] = None,
+    rel: t.Optional[str] = None,
+    extra_schemes: t.Optional[t.Iterable[str]] = None,
+) -> str:
+    """Convert URLs in text into clickable links.
+
+    This may not recognize links in some situations. Usually, a more
+    comprehensive formatter, such as a Markdown library, is a better
+    choice.
+
+    Works on ``http://``, ``https://``, ``www.``, ``mailto:``, and email
+    addresses. Links with trailing punctuation (periods, commas, closing
+    parentheses) and leading punctuation (opening parentheses) are
+    recognized excluding the punctuation. Email addresses that include
+    header fields are not recognized (for example,
+    ``mailto:address@example.com?cc=copy@example.com``).
+
+    :param value: Original text containing URLs to link.
+    :param trim_url_limit: Shorten displayed URL values to this length.
+    :param nofollow: Add the ``rel=nofollow`` attribute to links.
+    :param target: Add the ``target`` attribute to links.
+    :param rel: Add the ``rel`` attribute to links.
+    :param extra_schemes: Recognize URLs that start with these schemes
+        in addition to the default behavior. Defaults to
+        ``env.policies["urlize.extra_schemes"]``, which defaults to no
+        extra schemes.
+
+    .. versionchanged:: 3.0
+        The ``extra_schemes`` parameter was added.
+
+    .. versionchanged:: 3.0
+        Generate ``https://`` links for URLs without a scheme.
+
+    .. versionchanged:: 3.0
+        The parsing rules were updated. Recognize email addresses with
+        or without the ``mailto:`` scheme. Validate IP addresses. Ignore
+        parentheses and brackets in more cases.
+
+    .. versionchanged:: 2.8
+       The ``target`` parameter was added.
+    """
+    policies = eval_ctx.environment.policies
+    rel_parts = set((rel or "").split())
+
+    if nofollow:
+        rel_parts.add("nofollow")
+
+    rel_parts.update((policies["urlize.rel"] or "").split())
+    rel = " ".join(sorted(rel_parts)) or None
+
+    if target is None:
+        target = policies["urlize.target"]
+
+    if extra_schemes is None:
+        extra_schemes = policies["urlize.extra_schemes"] or ()
+
+    for scheme in extra_schemes:
+        if _uri_scheme_re.fullmatch(scheme) is None:
+            raise FilterArgumentError(f"{scheme!r} is not a valid URI scheme prefix.")
+
+    rv = urlize(
+        value,
+        trim_url_limit=trim_url_limit,
+        rel=rel,
+        target=target,
+        extra_schemes=extra_schemes,
+    )
+
+    if eval_ctx.autoescape:
+        rv = Markup(rv)
+
+    return rv
+
+
+def do_indent(
+    s: str, width: t.Union[int, str] = 4, first: bool = False, blank: bool = False
+) -> str:
+    """Return a copy of the string with each line indented by 4 spaces. The
+    first line and blank lines are not indented by default.
+
+    :param width: Number of spaces, or a string, to indent by.
+    :param first: Don't skip indenting the first line.
+    :param blank: Don't skip indenting empty lines.
+
+    .. versionchanged:: 3.0
+        ``width`` can be a string.
+
+    .. versionchanged:: 2.10
+        Blank lines are not indented by default.
+
+        Rename the ``indentfirst`` argument to ``first``.
+    """
+    if isinstance(width, str):
+        indention = width
+    else:
+        indention = " " * width
+
+    newline = "\n"
+
+    if isinstance(s, Markup):
+        indention = Markup(indention)
+        newline = Markup(newline)
+
+    s += newline  # this quirk is necessary for splitlines method
+
+    if blank:
+        rv = (newline + indention).join(s.splitlines())
+    else:
+        lines = s.splitlines()
+        rv = lines.pop(0)
+
+        if lines:
+            rv += newline + newline.join(
+                indention + line if line else line for line in lines
+            )
+
+    if first:
+        rv = indention + rv
+
+    return rv
+
+
+@pass_environment
+def do_truncate(
+    env: "Environment",
+    s: str,
+    length: int = 255,
+    killwords: bool = False,
+    end: str = "...",
+    leeway: t.Optional[int] = None,
+) -> str:
+    """Return a truncated copy of the string. The length is specified
+    with the first parameter which defaults to ``255``. If the second
+    parameter is ``true`` the filter will cut the text at length. Otherwise
+    it will discard the last word. If the text was in fact
+    truncated it will append an ellipsis sign (``"..."``). If you want a
+    different ellipsis sign than ``"..."`` you can specify it using the
+    third parameter. Strings that only exceed the length by the tolerance
+    margin given in the fourth parameter will not be truncated.
+
+    .. sourcecode:: jinja
+
+        {{ "foo bar baz qux"|truncate(9) }}
+            -> "foo..."
+        {{ "foo bar baz qux"|truncate(9, True) }}
+            -> "foo ba..."
+        {{ "foo bar baz qux"|truncate(11) }}
+            -> "foo bar baz qux"
+        {{ "foo bar baz qux"|truncate(11, False, '...', 0) }}
+            -> "foo bar..."
+
+    The default leeway on newer Jinja versions is 5 and was 0 before but
+    can be reconfigured globally.
+    """
+    if leeway is None:
+        leeway = env.policies["truncate.leeway"]
+
+    assert length >= len(end), f"expected length >= {len(end)}, got {length}"
+    assert leeway >= 0, f"expected leeway >= 0, got {leeway}"
+
+    if len(s) <= length + leeway:
+        return s
+
+    if killwords:
+        return s[: length - len(end)] + end
+
+    result = s[: length - len(end)].rsplit(" ", 1)[0]
+    return result + end
+
+
+@pass_environment
+def do_wordwrap(
+    environment: "Environment",
+    s: str,
+    width: int = 79,
+    break_long_words: bool = True,
+    wrapstring: t.Optional[str] = None,
+    break_on_hyphens: bool = True,
+) -> str:
+    """Wrap a string to the given width. Existing newlines are treated
+    as paragraphs to be wrapped separately.
+
+    :param s: Original text to wrap.
+    :param width: Maximum length of wrapped lines.
+    :param break_long_words: If a word is longer than ``width``, break
+        it across lines.
+    :param break_on_hyphens: If a word contains hyphens, it may be split
+        across lines.
+    :param wrapstring: String to join each wrapped line. Defaults to
+        :attr:`Environment.newline_sequence`.
+
+    .. versionchanged:: 2.11
+        Existing newlines are treated as paragraphs wrapped separately.
+
+    .. versionchanged:: 2.11
+        Added the ``break_on_hyphens`` parameter.
+
+    .. versionchanged:: 2.7
+        Added the ``wrapstring`` parameter.
+    """
+    import textwrap
+
+    if wrapstring is None:
+        wrapstring = environment.newline_sequence
+
+    # textwrap.wrap doesn't consider existing newlines when wrapping.
+    # If the string has a newline before width, wrap will still insert
+    # a newline at width, resulting in a short line. Instead, split and
+    # wrap each paragraph individually.
+    return wrapstring.join(
+        [
+            wrapstring.join(
+                textwrap.wrap(
+                    line,
+                    width=width,
+                    expand_tabs=False,
+                    replace_whitespace=False,
+                    break_long_words=break_long_words,
+                    break_on_hyphens=break_on_hyphens,
+                )
+            )
+            for line in s.splitlines()
+        ]
+    )
+
+
+_word_re = re.compile(r"\w+")
+
+
+def do_wordcount(s: str) -> int:
+    """Count the words in that string."""
+    return len(_word_re.findall(soft_str(s)))
+
+
+def do_int(value: t.Any, default: int = 0, base: int = 10) -> int:
+    """Convert the value into an integer. If the
+    conversion doesn't work it will return ``0``. You can
+    override this default using the first parameter. You
+    can also override the default base (10) in the second
+    parameter, which handles input with prefixes such as
+    0b, 0o and 0x for bases 2, 8 and 16 respectively.
+    The base is ignored for decimal numbers and non-string values.
+    """
+    try:
+        if isinstance(value, str):
+            return int(value, base)
+
+        return int(value)
+    except (TypeError, ValueError):
+        # this quirk is necessary so that "42.23"|int gives 42.
+        try:
+            return int(float(value))
+        except (TypeError, ValueError, OverflowError):
+            return default
+
+
+def do_float(value: t.Any, default: float = 0.0) -> float:
+    """Convert the value into a floating point number. If the
+    conversion doesn't work it will return ``0.0``. You can
+    override this default using the first parameter.
+    """
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        return default
+
+
+def do_format(value: str, *args: t.Any, **kwargs: t.Any) -> str:
+    """Apply the given values to a `printf-style`_ format string, like
+    ``string % values``.
+
+    .. sourcecode:: jinja
+
+        {{ "%s, %s!"|format(greeting, name) }}
+        Hello, World!
+
+    In most cases it should be more convenient and efficient to use the
+    ``%`` operator or :meth:`str.format`.
+
+    .. code-block:: text
+
+        {{ "%s, %s!" % (greeting, name) }}
+        {{ "{}, {}!".format(greeting, name) }}
+
+    .. _printf-style: https://docs.python.org/library/stdtypes.html
+        #printf-style-string-formatting
+    """
+    if args and kwargs:
+        raise FilterArgumentError(
+            "can't handle positional and keyword arguments at the same time"
+        )
+
+    return soft_str(value) % (kwargs or args)
+
+
+def do_trim(value: str, chars: t.Optional[str] = None) -> str:
+    """Strip leading and trailing characters, by default whitespace."""
+    return soft_str(value).strip(chars)
+
+
+def do_striptags(value: "t.Union[str, HasHTML]") -> str:
+    """Strip SGML/XML tags and replace adjacent whitespace by one space."""
+    if hasattr(value, "__html__"):
+        value = t.cast("HasHTML", value).__html__()
+
+    return Markup(str(value)).striptags()
+
+
+def sync_do_slice(
+    value: "t.Collection[V]", slices: int, fill_with: "t.Optional[V]" = None
+) -> "t.Iterator[t.List[V]]":
+    """Slice an iterator and return a list of lists containing
+    those items. Useful if you want to create a div containing
+    three ul tags that represent columns:
+
+    .. sourcecode:: html+jinja
+
+        <div class="columnwrapper">
+          {%- for column in items|slice(3) %}
+            <ul class="column-{{ loop.index }}">
+            {%- for item in column %}
+              <li>{{ item }}</li>
+            {%- endfor %}
+            </ul>
+          {%- endfor %}
+        </div>
+
+    If you pass it a second argument it's used to fill missing
+    values on the last iteration.
+    """
+    seq = list(value)
+    length = len(seq)
+    items_per_slice = length // slices
+    slices_with_extra = length % slices
+    offset = 0
+
+    for slice_number in range(slices):
+        start = offset + slice_number * items_per_slice
+
+        if slice_number < slices_with_extra:
+            offset += 1
+
+        end = offset + (slice_number + 1) * items_per_slice
+        tmp = seq[start:end]
+
+        if fill_with is not None and slice_number >= slices_with_extra:
+            tmp.append(fill_with)
+
+        yield tmp
+
+
+@async_variant(sync_do_slice)  # type: ignore
+async def do_slice(
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    slices: int,
+    fill_with: t.Optional[t.Any] = None,
+) -> "t.Iterator[t.List[V]]":
+    return sync_do_slice(await auto_to_list(value), slices, fill_with)
+
+
+def do_batch(
+    value: "t.Iterable[V]", linecount: int, fill_with: "t.Optional[V]" = None
+) -> "t.Iterator[t.List[V]]":
+    """
+    A filter that batches items. It works pretty much like `slice`
+    just the other way round. It returns a list of lists with the
+    given number of items. If you provide a second parameter this
+    is used to fill up missing items. See this example:
+
+    .. sourcecode:: html+jinja
+
+        <table>
+        {%- for row in items|batch(3, '&nbsp;') %}
+          <tr>
+          {%- for column in row %}
+            <td>{{ column }}</td>
+          {%- endfor %}
+          </tr>
+        {%- endfor %}
+        </table>
+    """
+    tmp: t.List[V] = []
+
+    for item in value:
+        if len(tmp) == linecount:
+            yield tmp
+            tmp = []
+
+        tmp.append(item)
+
+    if tmp:
+        if fill_with is not None and len(tmp) < linecount:
+            tmp += [fill_with] * (linecount - len(tmp))
+
+        yield tmp
+
+
+def do_round(
+    value: float,
+    precision: int = 0,
+    method: 'te.Literal["common", "ceil", "floor"]' = "common",
+) -> float:
+    """Round the number to a given precision. The first
+    parameter specifies the precision (default is ``0``), the
+    second the rounding method:
+
+    - ``'common'`` rounds either up or down
+    - ``'ceil'`` always rounds up
+    - ``'floor'`` always rounds down
+
+    If you don't specify a method ``'common'`` is used.
+
+    .. sourcecode:: jinja
+
+        {{ 42.55|round }}
+            -> 43.0
+        {{ 42.55|round(1, 'floor') }}
+            -> 42.5
+
+    Note that even if rounded to 0 precision, a float is returned.  If
+    you need a real integer, pipe it through `int`:
+
+    .. sourcecode:: jinja
+
+        {{ 42.55|round|int }}
+            -> 43
+    """
+    if method not in {"common", "ceil", "floor"}:
+        raise FilterArgumentError("method must be common, ceil or floor")
+
+    if method == "common":
+        return round(value, precision)
+
+    func = getattr(math, method)
+    return t.cast(float, func(value * (10**precision)) / (10**precision))
+
+
+class _GroupTuple(t.NamedTuple):
+    grouper: t.Any
+    list: t.List[t.Any]
+
+    # Use the regular tuple repr to hide this subclass if users print
+    # out the value during debugging.
+    def __repr__(self) -> str:
+        return tuple.__repr__(self)
+
+    def __str__(self) -> str:
+        return tuple.__str__(self)
+
+
+@pass_environment
+def sync_do_groupby(
+    environment: "Environment",
+    value: "t.Iterable[V]",
+    attribute: t.Union[str, int],
+    default: t.Optional[t.Any] = None,
+    case_sensitive: bool = False,
+) -> "t.List[_GroupTuple]":
+    """Group a sequence of objects by an attribute using Python's
+    :func:`itertools.groupby`. The attribute can use dot notation for
+    nested access, like ``"address.city"``. Unlike Python's ``groupby``,
+    the values are sorted first so only one group is returned for each
+    unique value.
+
+    For example, a list of ``User`` objects with a ``city`` attribute
+    can be rendered in groups. In this example, ``grouper`` refers to
+    the ``city`` value of the group.
+
+    .. sourcecode:: html+jinja
+
+        <ul>{% for city, items in users|groupby("city") %}
+          <li>{{ city }}
+            <ul>{% for user in items %}
+              <li>{{ user.name }}
+            {% endfor %}</ul>
+          </li>
+        {% endfor %}</ul>
+
+    ``groupby`` yields namedtuples of ``(grouper, list)``, which
+    can be used instead of the tuple unpacking above. ``grouper`` is the
+    value of the attribute, and ``list`` is the items with that value.
+
+    .. sourcecode:: html+jinja
+
+        <ul>{% for group in users|groupby("city") %}
+          <li>{{ group.grouper }}: {{ group.list|join(", ") }}
+        {% endfor %}</ul>
+
+    You can specify a ``default`` value to use if an object in the list
+    does not have the given attribute.
+
+    .. sourcecode:: jinja
+
+        <ul>{% for city, items in users|groupby("city", default="NY") %}
+          <li>{{ city }}: {{ items|map(attribute="name")|join(", ") }}</li>
+        {% endfor %}</ul>
+
+    Like the :func:`~jinja-filters.sort` filter, sorting and grouping is
+    case-insensitive by default. The ``key`` for each group will have
+    the case of the first item in that group of values. For example, if
+    a list of users has cities ``["CA", "NY", "ca"]``, the "CA" group
+    will have two values. This can be disabled by passing
+    ``case_sensitive=True``.
+
+    .. versionchanged:: 3.1
+        Added the ``case_sensitive`` parameter. Sorting and grouping is
+        case-insensitive by default, matching other filters that do
+        comparisons.
+
+    .. versionchanged:: 3.0
+        Added the ``default`` parameter.
+
+    .. versionchanged:: 2.6
+        The attribute supports dot notation for nested access.
+    """
+    expr = make_attrgetter(
+        environment,
+        attribute,
+        postprocess=ignore_case if not case_sensitive else None,
+        default=default,
+    )
+    out = [
+        _GroupTuple(key, list(values))
+        for key, values in groupby(sorted(value, key=expr), expr)
+    ]
+
+    if not case_sensitive:
+        # Return the real key from the first value instead of the lowercase key.
+        output_expr = make_attrgetter(environment, attribute, default=default)
+        out = [_GroupTuple(output_expr(values[0]), values) for _, values in out]
+
+    return out
+
+
+@async_variant(sync_do_groupby)  # type: ignore
+async def do_groupby(
+    environment: "Environment",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    attribute: t.Union[str, int],
+    default: t.Optional[t.Any] = None,
+    case_sensitive: bool = False,
+) -> "t.List[_GroupTuple]":
+    expr = make_attrgetter(
+        environment,
+        attribute,
+        postprocess=ignore_case if not case_sensitive else None,
+        default=default,
+    )
+    out = [
+        _GroupTuple(key, await auto_to_list(values))
+        for key, values in groupby(sorted(await auto_to_list(value), key=expr), expr)
+    ]
+
+    if not case_sensitive:
+        # Return the real key from the first value instead of the lowercase key.
+        output_expr = make_attrgetter(environment, attribute, default=default)
+        out = [_GroupTuple(output_expr(values[0]), values) for _, values in out]
+
+    return out
+
+
+@pass_environment
+def sync_do_sum(
+    environment: "Environment",
+    iterable: "t.Iterable[V]",
+    attribute: t.Optional[t.Union[str, int]] = None,
+    start: V = 0,  # type: ignore
+) -> V:
+    """Returns the sum of a sequence of numbers plus the value of parameter
+    'start' (which defaults to 0).  When the sequence is empty it returns
+    start.
+
+    It is also possible to sum up only certain attributes:
+
+    .. sourcecode:: jinja
+
+        Total: {{ items|sum(attribute='price') }}
+
+    .. versionchanged:: 2.6
+       The ``attribute`` parameter was added to allow summing up over
+       attributes.  Also the ``start`` parameter was moved on to the right.
+    """
+    if attribute is not None:
+        iterable = map(make_attrgetter(environment, attribute), iterable)
+
+    return sum(iterable, start)  # type: ignore[no-any-return, call-overload]
+
+
+@async_variant(sync_do_sum)  # type: ignore
+async def do_sum(
+    environment: "Environment",
+    iterable: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    attribute: t.Optional[t.Union[str, int]] = None,
+    start: V = 0,  # type: ignore
+) -> V:
+    rv = start
+
+    if attribute is not None:
+        func = make_attrgetter(environment, attribute)
+    else:
+
+        def func(x: V) -> V:
+            return x
+
+    async for item in auto_aiter(iterable):
+        rv += func(item)
+
+    return rv
+
+
+def sync_do_list(value: "t.Iterable[V]") -> "t.List[V]":
+    """Convert the value into a list.  If it was a string the returned list
+    will be a list of characters.
+    """
+    return list(value)
+
+
+@async_variant(sync_do_list)  # type: ignore
+async def do_list(value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]") -> "t.List[V]":
+    return await auto_to_list(value)
+
+
+def do_mark_safe(value: str) -> Markup:
+    """Mark the value as safe which means that in an environment with automatic
+    escaping enabled this variable will not be escaped.
+    """
+    return Markup(value)
+
+
+def do_mark_unsafe(value: str) -> str:
+    """Mark a value as unsafe.  This is the reverse operation for :func:`safe`."""
+    return str(value)
+
+
+@typing.overload
+def do_reverse(value: str) -> str: ...
+
+
+@typing.overload
+def do_reverse(value: "t.Iterable[V]") -> "t.Iterable[V]": ...
+
+
+def do_reverse(value: t.Union[str, t.Iterable[V]]) -> t.Union[str, t.Iterable[V]]:
+    """Reverse the object or return an iterator that iterates over it the other
+    way round.
+    """
+    if isinstance(value, str):
+        return value[::-1]
+
+    try:
+        return reversed(value)  # type: ignore
+    except TypeError:
+        try:
+            rv = list(value)
+            rv.reverse()
+            return rv
+        except TypeError as e:
+            raise FilterArgumentError("argument must be iterable") from e
+
+
+@pass_environment
+def do_attr(
+    environment: "Environment", obj: t.Any, name: str
+) -> t.Union[Undefined, t.Any]:
+    """Get an attribute of an object.  ``foo|attr("bar")`` works like
+    ``foo.bar`` just that always an attribute is returned and items are not
+    looked up.
+
+    See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details.
+    """
+    try:
+        name = str(name)
+    except UnicodeError:
+        pass
+    else:
+        try:
+            value = getattr(obj, name)
+        except AttributeError:
+            pass
+        else:
+            if environment.sandboxed:
+                environment = t.cast("SandboxedEnvironment", environment)
+
+                if not environment.is_safe_attribute(obj, name, value):
+                    return environment.unsafe_undefined(obj, name)
+
+            return value
+
+    return environment.undefined(obj=obj, name=name)
+
+
+@typing.overload
+def sync_do_map(
+    context: "Context",
+    value: t.Iterable[t.Any],
+    name: str,
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> t.Iterable[t.Any]: ...
+
+
+@typing.overload
+def sync_do_map(
+    context: "Context",
+    value: t.Iterable[t.Any],
+    *,
+    attribute: str = ...,
+    default: t.Optional[t.Any] = None,
+) -> t.Iterable[t.Any]: ...
+
+
+@pass_context
+def sync_do_map(
+    context: "Context", value: t.Iterable[t.Any], *args: t.Any, **kwargs: t.Any
+) -> t.Iterable[t.Any]:
+    """Applies a filter on a sequence of objects or looks up an attribute.
+    This is useful when dealing with lists of objects but you are really
+    only interested in a certain value of it.
+
+    The basic usage is mapping on an attribute.  Imagine you have a list
+    of users but you are only interested in a list of usernames:
+
+    .. sourcecode:: jinja
+
+        Users on this page: {{ users|map(attribute='username')|join(', ') }}
+
+    You can specify a ``default`` value to use if an object in the list
+    does not have the given attribute.
+
+    .. sourcecode:: jinja
+
+        {{ users|map(attribute="username", default="Anonymous")|join(", ") }}
+
+    Alternatively you can let it invoke a filter by passing the name of the
+    filter and the arguments afterwards.  A good example would be applying a
+    text conversion filter on a sequence:
+
+    .. sourcecode:: jinja
+
+        Users on this page: {{ titles|map('lower')|join(', ') }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (u.username for u in users)
+        (getattr(u, "username", "Anonymous") for u in users)
+        (do_lower(x) for x in titles)
+
+    .. versionchanged:: 2.11.0
+        Added the ``default`` parameter.
+
+    .. versionadded:: 2.7
+    """
+    if value:
+        func = prepare_map(context, args, kwargs)
+
+        for item in value:
+            yield func(item)
+
+
+@typing.overload
+def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable[t.Any], t.Iterable[t.Any]],
+    name: str,
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> t.Iterable[t.Any]: ...
+
+
+@typing.overload
+def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable[t.Any], t.Iterable[t.Any]],
+    *,
+    attribute: str = ...,
+    default: t.Optional[t.Any] = None,
+) -> t.Iterable[t.Any]: ...
+
+
+@async_variant(sync_do_map)  # type: ignore
+async def do_map(
+    context: "Context",
+    value: t.Union[t.AsyncIterable[t.Any], t.Iterable[t.Any]],
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> t.AsyncIterable[t.Any]:
+    if value:
+        func = prepare_map(context, args, kwargs)
+
+        async for item in auto_aiter(value):
+            yield await auto_await(func(item))
+
+
+@pass_context
+def sync_do_select(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to each object,
+    and only selecting the objects with the test succeeding.
+
+    If no test is specified, each object will be evaluated as a boolean.
+
+    Example usage:
+
+    .. sourcecode:: jinja
+
+        {{ numbers|select("odd") }}
+        {{ numbers|select("odd") }}
+        {{ numbers|select("divisibleby", 3) }}
+        {{ numbers|select("lessthan", 42) }}
+        {{ strings|select("equalto", "mystring") }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (n for n in numbers if test_odd(n))
+        (n for n in numbers if test_divisibleby(n, 3))
+
+    .. versionadded:: 2.7
+    """
+    return select_or_reject(context, value, args, kwargs, lambda x: x, False)
+
+
+@async_variant(sync_do_select)  # type: ignore
+async def do_select(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: x, False)
+
+
+@pass_context
+def sync_do_reject(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to each object,
+    and rejecting the objects with the test succeeding.
+
+    If no test is specified, each object will be evaluated as a boolean.
+
+    Example usage:
+
+    .. sourcecode:: jinja
+
+        {{ numbers|reject("odd") }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (n for n in numbers if not test_odd(n))
+
+    .. versionadded:: 2.7
+    """
+    return select_or_reject(context, value, args, kwargs, lambda x: not x, False)
+
+
+@async_variant(sync_do_reject)  # type: ignore
+async def do_reject(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: not x, False)
+
+
+@pass_context
+def sync_do_selectattr(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to the specified
+    attribute of each object, and only selecting the objects with the
+    test succeeding.
+
+    If no test is specified, the attribute's value will be evaluated as
+    a boolean.
+
+    Example usage:
+
+    .. sourcecode:: jinja
+
+        {{ users|selectattr("is_active") }}
+        {{ users|selectattr("email", "none") }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (user for user in users if user.is_active)
+        (user for user in users if test_none(user.email))
+
+    .. versionadded:: 2.7
+    """
+    return select_or_reject(context, value, args, kwargs, lambda x: x, True)
+
+
+@async_variant(sync_do_selectattr)  # type: ignore
+async def do_selectattr(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: x, True)
+
+
+@pass_context
+def sync_do_rejectattr(
+    context: "Context", value: "t.Iterable[V]", *args: t.Any, **kwargs: t.Any
+) -> "t.Iterator[V]":
+    """Filters a sequence of objects by applying a test to the specified
+    attribute of each object, and rejecting the objects with the test
+    succeeding.
+
+    If no test is specified, the attribute's value will be evaluated as
+    a boolean.
+
+    .. sourcecode:: jinja
+
+        {{ users|rejectattr("is_active") }}
+        {{ users|rejectattr("email", "none") }}
+
+    Similar to a generator comprehension such as:
+
+    .. code-block:: python
+
+        (user for user in users if not user.is_active)
+        (user for user in users if not test_none(user.email))
+
+    .. versionadded:: 2.7
+    """
+    return select_or_reject(context, value, args, kwargs, lambda x: not x, True)
+
+
+@async_variant(sync_do_rejectattr)  # type: ignore
+async def do_rejectattr(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    *args: t.Any,
+    **kwargs: t.Any,
+) -> "t.AsyncIterator[V]":
+    return async_select_or_reject(context, value, args, kwargs, lambda x: not x, True)
+
+
+@pass_eval_context
+def do_tojson(
+    eval_ctx: "EvalContext", value: t.Any, indent: t.Optional[int] = None
+) -> Markup:
+    """Serialize an object to a string of JSON, and mark it safe to
+    render in HTML. This filter is only for use in HTML documents.
+
+    The returned string is safe to render in HTML documents and
+    ``<script>`` tags. The exception is in HTML attributes that are
+    double quoted; either use single quotes or the ``|forceescape``
+    filter.
+
+    :param value: The object to serialize to JSON.
+    :param indent: The ``indent`` parameter passed to ``dumps``, for
+        pretty-printing the value.
+
+    .. versionadded:: 2.9
+    """
+    policies = eval_ctx.environment.policies
+    dumps = policies["json.dumps_function"]
+    kwargs = policies["json.dumps_kwargs"]
+
+    if indent is not None:
+        kwargs = kwargs.copy()
+        kwargs["indent"] = indent
+
+    return htmlsafe_json_dumps(value, dumps=dumps, **kwargs)
+
+
+def prepare_map(
+    context: "Context", args: t.Tuple[t.Any, ...], kwargs: t.Dict[str, t.Any]
+) -> t.Callable[[t.Any], t.Any]:
+    if not args and "attribute" in kwargs:
+        attribute = kwargs.pop("attribute")
+        default = kwargs.pop("default", None)
+
+        if kwargs:
+            raise FilterArgumentError(
+                f"Unexpected keyword argument {next(iter(kwargs))!r}"
+            )
+
+        func = make_attrgetter(context.environment, attribute, default=default)
+    else:
+        try:
+            name = args[0]
+            args = args[1:]
+        except LookupError:
+            raise FilterArgumentError("map requires a filter argument") from None
+
+        def func(item: t.Any) -> t.Any:
+            return context.environment.call_filter(
+                name, item, args, kwargs, context=context
+            )
+
+    return func
+
+
+def prepare_select_or_reject(
+    context: "Context",
+    args: t.Tuple[t.Any, ...],
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> t.Callable[[t.Any], t.Any]:
+    if lookup_attr:
+        try:
+            attr = args[0]
+        except LookupError:
+            raise FilterArgumentError("Missing parameter for attribute name") from None
+
+        transfunc = make_attrgetter(context.environment, attr)
+        off = 1
+    else:
+        off = 0
+
+        def transfunc(x: V) -> V:
+            return x
+
+    try:
+        name = args[off]
+        args = args[1 + off :]
+
+        def func(item: t.Any) -> t.Any:
+            return context.environment.call_test(name, item, args, kwargs, context)
+
+    except LookupError:
+        func = bool  # type: ignore
+
+    return lambda item: modfunc(func(transfunc(item)))
+
+
+def select_or_reject(
+    context: "Context",
+    value: "t.Iterable[V]",
+    args: t.Tuple[t.Any, ...],
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> "t.Iterator[V]":
+    if value:
+        func = prepare_select_or_reject(context, args, kwargs, modfunc, lookup_attr)
+
+        for item in value:
+            if func(item):
+                yield item
+
+
+async def async_select_or_reject(
+    context: "Context",
+    value: "t.Union[t.AsyncIterable[V], t.Iterable[V]]",
+    args: t.Tuple[t.Any, ...],
+    kwargs: t.Dict[str, t.Any],
+    modfunc: t.Callable[[t.Any], t.Any],
+    lookup_attr: bool,
+) -> "t.AsyncIterator[V]":
+    if value:
+        func = prepare_select_or_reject(context, args, kwargs, modfunc, lookup_attr)
+
+        async for item in auto_aiter(value):
+            if func(item):
+                yield item
+
+
+FILTERS = {
+    "abs": abs,
+    "attr": do_attr,
+    "batch": do_batch,
+    "capitalize": do_capitalize,
+    "center": do_center,
+    "count": len,
+    "d": do_default,
+    "default": do_default,
+    "dictsort": do_dictsort,
+    "e": escape,
+    "escape": escape,
+    "filesizeformat": do_filesizeformat,
+    "first": do_first,
+    "float": do_float,
+    "forceescape": do_forceescape,
+    "format": do_format,
+    "groupby": do_groupby,
+    "indent": do_indent,
+    "int": do_int,
+    "join": do_join,
+    "last": do_last,
+    "length": len,
+    "list": do_list,
+    "lower": do_lower,
+    "items": do_items,
+    "map": do_map,
+    "min": do_min,
+    "max": do_max,
+    "pprint": do_pprint,
+    "random": do_random,
+    "reject": do_reject,
+    "rejectattr": do_rejectattr,
+    "replace": do_replace,
+    "reverse": do_reverse,
+    "round": do_round,
+    "safe": do_mark_safe,
+    "select": do_select,
+    "selectattr": do_selectattr,
+    "slice": do_slice,
+    "sort": do_sort,
+    "string": soft_str,
+    "striptags": do_striptags,
+    "sum": do_sum,
+    "title": do_title,
+    "trim": do_trim,
+    "truncate": do_truncate,
+    "unique": do_unique,
+    "upper": do_upper,
+    "urlencode": do_urlencode,
+    "urlize": do_urlize,
+    "wordcount": do_wordcount,
+    "wordwrap": do_wordwrap,
+    "xmlattr": do_xmlattr,
+    "tojson": do_tojson,
+}

janus/lib/python3.10/site-packages/jinja2/loaders.py

@@ -0,0 +1,693 @@
+"""API and implementations for loading templates from different data
+sources.
+"""
+
+import importlib.util
+import os
+import posixpath
+import sys
+import typing as t
+import weakref
+import zipimport
+from collections import abc
+from hashlib import sha1
+from importlib import import_module
+from types import ModuleType
+
+from .exceptions import TemplateNotFound
+from .utils import internalcode
+
+if t.TYPE_CHECKING:
+    from .environment import Environment
+    from .environment import Template
+
+
+def split_template_path(template: str) -> t.List[str]:
+    """Split a path into segments and perform a sanity check.  If it detects
+    '..' in the path it will raise a `TemplateNotFound` error.
+    """
+    pieces = []
+    for piece in template.split("/"):
+        if (
+            os.path.sep in piece
+            or (os.path.altsep and os.path.altsep in piece)
+            or piece == os.path.pardir
+        ):
+            raise TemplateNotFound(template)
+        elif piece and piece != ".":
+            pieces.append(piece)
+    return pieces
+
+
+class BaseLoader:
+    """Baseclass for all loaders.  Subclass this and override `get_source` to
+    implement a custom loading mechanism.  The environment provides a
+    `get_template` method that calls the loader's `load` method to get the
+    :class:`Template` object.
+
+    A very basic example for a loader that looks up templates on the file
+    system could look like this::
+
+        from jinja2 import BaseLoader, TemplateNotFound
+        from os.path import join, exists, getmtime
+
+        class MyLoader(BaseLoader):
+
+            def __init__(self, path):
+                self.path = path
+
+            def get_source(self, environment, template):
+                path = join(self.path, template)
+                if not exists(path):
+                    raise TemplateNotFound(template)
+                mtime = getmtime(path)
+                with open(path) as f:
+                    source = f.read()
+                return source, path, lambda: mtime == getmtime(path)
+    """
+
+    #: if set to `False` it indicates that the loader cannot provide access
+    #: to the source of templates.
+    #:
+    #: .. versionadded:: 2.4
+    has_source_access = True
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
+        """Get the template source, filename and reload helper for a template.
+        It's passed the environment and template name and has to return a
+        tuple in the form ``(source, filename, uptodate)`` or raise a
+        `TemplateNotFound` error if it can't locate the template.
+
+        The source part of the returned tuple must be the source of the
+        template as a string. The filename should be the name of the
+        file on the filesystem if it was loaded from there, otherwise
+        ``None``. The filename is used by Python for the tracebacks
+        if no loader extension is used.
+
+        The last item in the tuple is the `uptodate` function.  If auto
+        reloading is enabled it's always called to check if the template
+        changed.  No arguments are passed so the function must store the
+        old state somewhere (for example in a closure).  If it returns `False`
+        the template will be reloaded.
+        """
+        if not self.has_source_access:
+            raise RuntimeError(
+                f"{type(self).__name__} cannot provide access to the source"
+            )
+        raise TemplateNotFound(template)
+
+    def list_templates(self) -> t.List[str]:
+        """Iterates over all templates.  If the loader does not support that
+        it should raise a :exc:`TypeError` which is the default behavior.
+        """
+        raise TypeError("this loader cannot iterate over all templates")
+
+    @internalcode
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        """Loads a template.  This method looks up the template in the cache
+        or loads one by calling :meth:`get_source`.  Subclasses should not
+        override this method as loaders working on collections of other
+        loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
+        will not call this method but `get_source` directly.
+        """
+        code = None
+        if globals is None:
+            globals = {}
+
+        # first we try to get the source for this template together
+        # with the filename and the uptodate function.
+        source, filename, uptodate = self.get_source(environment, name)
+
+        # try to load the code from the bytecode cache if there is a
+        # bytecode cache configured.
+        bcc = environment.bytecode_cache
+        if bcc is not None:
+            bucket = bcc.get_bucket(environment, name, filename, source)
+            code = bucket.code
+
+        # if we don't have code so far (not cached, no longer up to
+        # date) etc. we compile the template
+        if code is None:
+            code = environment.compile(source, name, filename)
+
+        # if the bytecode cache is available and the bucket doesn't
+        # have a code so far, we give the bucket the new code and put
+        # it back to the bytecode cache.
+        if bcc is not None and bucket.code is None:
+            bucket.code = code
+            bcc.set_bucket(bucket)
+
+        return environment.template_class.from_code(
+            environment, code, globals, uptodate
+        )
+
+
+class FileSystemLoader(BaseLoader):
+    """Load templates from a directory in the file system.
+
+    The path can be relative or absolute. Relative paths are relative to
+    the current working directory.
+
+    .. code-block:: python
+
+        loader = FileSystemLoader("templates")
+
+    A list of paths can be given. The directories will be searched in
+    order, stopping at the first matching template.
+
+    .. code-block:: python
+
+        loader = FileSystemLoader(["/override/templates", "/default/templates"])
+
+    :param searchpath: A path, or list of paths, to the directory that
+        contains the templates.
+    :param encoding: Use this encoding to read the text from template
+        files.
+    :param followlinks: Follow symbolic links in the path.
+
+    .. versionchanged:: 2.8
+        Added the ``followlinks`` parameter.
+    """
+
+    def __init__(
+        self,
+        searchpath: t.Union[
+            str, "os.PathLike[str]", t.Sequence[t.Union[str, "os.PathLike[str]"]]
+        ],
+        encoding: str = "utf-8",
+        followlinks: bool = False,
+    ) -> None:
+        if not isinstance(searchpath, abc.Iterable) or isinstance(searchpath, str):
+            searchpath = [searchpath]
+
+        self.searchpath = [os.fspath(p) for p in searchpath]
+        self.encoding = encoding
+        self.followlinks = followlinks
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, str, t.Callable[[], bool]]:
+        pieces = split_template_path(template)
+
+        for searchpath in self.searchpath:
+            # Use posixpath even on Windows to avoid "drive:" or UNC
+            # segments breaking out of the search directory.
+            filename = posixpath.join(searchpath, *pieces)
+
+            if os.path.isfile(filename):
+                break
+        else:
+            plural = "path" if len(self.searchpath) == 1 else "paths"
+            paths_str = ", ".join(repr(p) for p in self.searchpath)
+            raise TemplateNotFound(
+                template,
+                f"{template!r} not found in search {plural}: {paths_str}",
+            )
+
+        with open(filename, encoding=self.encoding) as f:
+            contents = f.read()
+
+        mtime = os.path.getmtime(filename)
+
+        def uptodate() -> bool:
+            try:
+                return os.path.getmtime(filename) == mtime
+            except OSError:
+                return False
+
+        # Use normpath to convert Windows altsep to sep.
+        return contents, os.path.normpath(filename), uptodate
+
+    def list_templates(self) -> t.List[str]:
+        found = set()
+        for searchpath in self.searchpath:
+            walk_dir = os.walk(searchpath, followlinks=self.followlinks)
+            for dirpath, _, filenames in walk_dir:
+                for filename in filenames:
+                    template = (
+                        os.path.join(dirpath, filename)[len(searchpath) :]
+                        .strip(os.path.sep)
+                        .replace(os.path.sep, "/")
+                    )
+                    if template[:2] == "./":
+                        template = template[2:]
+                    if template not in found:
+                        found.add(template)
+        return sorted(found)
+
+
+if sys.version_info >= (3, 13):
+
+    def _get_zipimporter_files(z: t.Any) -> t.Dict[str, object]:
+        try:
+            get_files = z._get_files
+        except AttributeError as e:
+            raise TypeError(
+                "This zip import does not have the required"
+                " metadata to list templates."
+            ) from e
+        return get_files()
+else:
+
+    def _get_zipimporter_files(z: t.Any) -> t.Dict[str, object]:
+        try:
+            files = z._files
+        except AttributeError as e:
+            raise TypeError(
+                "This zip import does not have the required"
+                " metadata to list templates."
+            ) from e
+        return files  # type: ignore[no-any-return]
+
+
+class PackageLoader(BaseLoader):
+    """Load templates from a directory in a Python package.
+
+    :param package_name: Import name of the package that contains the
+        template directory.
+    :param package_path: Directory within the imported package that
+        contains the templates.
+    :param encoding: Encoding of template files.
+
+    The following example looks up templates in the ``pages`` directory
+    within the ``project.ui`` package.
+
+    .. code-block:: python
+
+        loader = PackageLoader("project.ui", "pages")
+
+    Only packages installed as directories (standard pip behavior) or
+    zip/egg files (less common) are supported. The Python API for
+    introspecting data in packages is too limited to support other
+    installation methods the way this loader requires.
+
+    There is limited support for :pep:`420` namespace packages. The
+    template directory is assumed to only be in one namespace
+    contributor. Zip files contributing to a namespace are not
+    supported.
+
+    .. versionchanged:: 3.0
+        No longer uses ``setuptools`` as a dependency.
+
+    .. versionchanged:: 3.0
+        Limited PEP 420 namespace package support.
+    """
+
+    def __init__(
+        self,
+        package_name: str,
+        package_path: "str" = "templates",
+        encoding: str = "utf-8",
+    ) -> None:
+        package_path = os.path.normpath(package_path).rstrip(os.path.sep)
+
+        # normpath preserves ".", which isn't valid in zip paths.
+        if package_path == os.path.curdir:
+            package_path = ""
+        elif package_path[:2] == os.path.curdir + os.path.sep:
+            package_path = package_path[2:]
+
+        self.package_path = package_path
+        self.package_name = package_name
+        self.encoding = encoding
+
+        # Make sure the package exists. This also makes namespace
+        # packages work, otherwise get_loader returns None.
+        import_module(package_name)
+        spec = importlib.util.find_spec(package_name)
+        assert spec is not None, "An import spec was not found for the package."
+        loader = spec.loader
+        assert loader is not None, "A loader was not found for the package."
+        self._loader = loader
+        self._archive = None
+
+        if isinstance(loader, zipimport.zipimporter):
+            self._archive = loader.archive
+            pkgdir = next(iter(spec.submodule_search_locations))  # type: ignore
+            template_root = os.path.join(pkgdir, package_path).rstrip(os.path.sep)
+        else:
+            roots: t.List[str] = []
+
+            # One element for regular packages, multiple for namespace
+            # packages, or None for single module file.
+            if spec.submodule_search_locations:
+                roots.extend(spec.submodule_search_locations)
+            # A single module file, use the parent directory instead.
+            elif spec.origin is not None:
+                roots.append(os.path.dirname(spec.origin))
+
+            if not roots:
+                raise ValueError(
+                    f"The {package_name!r} package was not installed in a"
+                    " way that PackageLoader understands."
+                )
+
+            for root in roots:
+                root = os.path.join(root, package_path)
+
+                if os.path.isdir(root):
+                    template_root = root
+                    break
+            else:
+                raise ValueError(
+                    f"PackageLoader could not find a {package_path!r} directory"
+                    f" in the {package_name!r} package."
+                )
+
+        self._template_root = template_root
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, str, t.Optional[t.Callable[[], bool]]]:
+        # Use posixpath even on Windows to avoid "drive:" or UNC
+        # segments breaking out of the search directory. Use normpath to
+        # convert Windows altsep to sep.
+        p = os.path.normpath(
+            posixpath.join(self._template_root, *split_template_path(template))
+        )
+        up_to_date: t.Optional[t.Callable[[], bool]]
+
+        if self._archive is None:
+            # Package is a directory.
+            if not os.path.isfile(p):
+                raise TemplateNotFound(template)
+
+            with open(p, "rb") as f:
+                source = f.read()
+
+            mtime = os.path.getmtime(p)
+
+            def up_to_date() -> bool:
+                return os.path.isfile(p) and os.path.getmtime(p) == mtime
+
+        else:
+            # Package is a zip file.
+            try:
+                source = self._loader.get_data(p)  # type: ignore
+            except OSError as e:
+                raise TemplateNotFound(template) from e
+
+            # Could use the zip's mtime for all template mtimes, but
+            # would need to safely reload the module if it's out of
+            # date, so just report it as always current.
+            up_to_date = None
+
+        return source.decode(self.encoding), p, up_to_date
+
+    def list_templates(self) -> t.List[str]:
+        results: t.List[str] = []
+
+        if self._archive is None:
+            # Package is a directory.
+            offset = len(self._template_root)
+
+            for dirpath, _, filenames in os.walk(self._template_root):
+                dirpath = dirpath[offset:].lstrip(os.path.sep)
+                results.extend(
+                    os.path.join(dirpath, name).replace(os.path.sep, "/")
+                    for name in filenames
+                )
+        else:
+            files = _get_zipimporter_files(self._loader)
+
+            # Package is a zip file.
+            prefix = (
+                self._template_root[len(self._archive) :].lstrip(os.path.sep)
+                + os.path.sep
+            )
+            offset = len(prefix)
+
+            for name in files:
+                # Find names under the templates directory that aren't directories.
+                if name.startswith(prefix) and name[-1] != os.path.sep:
+                    results.append(name[offset:].replace(os.path.sep, "/"))
+
+        results.sort()
+        return results
+
+
+class DictLoader(BaseLoader):
+    """Loads a template from a Python dict mapping template names to
+    template source.  This loader is useful for unittesting:
+
+    >>> loader = DictLoader({'index.html': 'source here'})
+
+    Because auto reloading is rarely useful this is disabled by default.
+    """
+
+    def __init__(self, mapping: t.Mapping[str, str]) -> None:
+        self.mapping = mapping
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, None, t.Callable[[], bool]]:
+        if template in self.mapping:
+            source = self.mapping[template]
+            return source, None, lambda: source == self.mapping.get(template)
+        raise TemplateNotFound(template)
+
+    def list_templates(self) -> t.List[str]:
+        return sorted(self.mapping)
+
+
+class FunctionLoader(BaseLoader):
+    """A loader that is passed a function which does the loading.  The
+    function receives the name of the template and has to return either
+    a string with the template source, a tuple in the form ``(source,
+    filename, uptodatefunc)`` or `None` if the template does not exist.
+
+    >>> def load_template(name):
+    ...     if name == 'index.html':
+    ...         return '...'
+    ...
+    >>> loader = FunctionLoader(load_template)
+
+    The `uptodatefunc` is a function that is called if autoreload is enabled
+    and has to return `True` if the template is still up to date.  For more
+    details have a look at :meth:`BaseLoader.get_source` which has the same
+    return value.
+    """
+
+    def __init__(
+        self,
+        load_func: t.Callable[
+            [str],
+            t.Optional[
+                t.Union[
+                    str, t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]
+                ]
+            ],
+        ],
+    ) -> None:
+        self.load_func = load_func
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
+        rv = self.load_func(template)
+
+        if rv is None:
+            raise TemplateNotFound(template)
+
+        if isinstance(rv, str):
+            return rv, None, None
+
+        return rv
+
+
+class PrefixLoader(BaseLoader):
+    """A loader that is passed a dict of loaders where each loader is bound
+    to a prefix.  The prefix is delimited from the template by a slash per
+    default, which can be changed by setting the `delimiter` argument to
+    something else::
+
+        loader = PrefixLoader({
+            'app1':     PackageLoader('mypackage.app1'),
+            'app2':     PackageLoader('mypackage.app2')
+        })
+
+    By loading ``'app1/index.html'`` the file from the app1 package is loaded,
+    by loading ``'app2/index.html'`` the file from the second.
+    """
+
+    def __init__(
+        self, mapping: t.Mapping[str, BaseLoader], delimiter: str = "/"
+    ) -> None:
+        self.mapping = mapping
+        self.delimiter = delimiter
+
+    def get_loader(self, template: str) -> t.Tuple[BaseLoader, str]:
+        try:
+            prefix, name = template.split(self.delimiter, 1)
+            loader = self.mapping[prefix]
+        except (ValueError, KeyError) as e:
+            raise TemplateNotFound(template) from e
+        return loader, name
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
+        loader, name = self.get_loader(template)
+        try:
+            return loader.get_source(environment, name)
+        except TemplateNotFound as e:
+            # re-raise the exception with the correct filename here.
+            # (the one that includes the prefix)
+            raise TemplateNotFound(template) from e
+
+    @internalcode
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        loader, local_name = self.get_loader(name)
+        try:
+            return loader.load(environment, local_name, globals)
+        except TemplateNotFound as e:
+            # re-raise the exception with the correct filename here.
+            # (the one that includes the prefix)
+            raise TemplateNotFound(name) from e
+
+    def list_templates(self) -> t.List[str]:
+        result = []
+        for prefix, loader in self.mapping.items():
+            for template in loader.list_templates():
+                result.append(prefix + self.delimiter + template)
+        return result
+
+
+class ChoiceLoader(BaseLoader):
+    """This loader works like the `PrefixLoader` just that no prefix is
+    specified.  If a template could not be found by one loader the next one
+    is tried.
+
+    >>> loader = ChoiceLoader([
+    ...     FileSystemLoader('/path/to/user/templates'),
+    ...     FileSystemLoader('/path/to/system/templates')
+    ... ])
+
+    This is useful if you want to allow users to override builtin templates
+    from a different location.
+    """
+
+    def __init__(self, loaders: t.Sequence[BaseLoader]) -> None:
+        self.loaders = loaders
+
+    def get_source(
+        self, environment: "Environment", template: str
+    ) -> t.Tuple[str, t.Optional[str], t.Optional[t.Callable[[], bool]]]:
+        for loader in self.loaders:
+            try:
+                return loader.get_source(environment, template)
+            except TemplateNotFound:
+                pass
+        raise TemplateNotFound(template)
+
+    @internalcode
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        for loader in self.loaders:
+            try:
+                return loader.load(environment, name, globals)
+            except TemplateNotFound:
+                pass
+        raise TemplateNotFound(name)
+
+    def list_templates(self) -> t.List[str]:
+        found = set()
+        for loader in self.loaders:
+            found.update(loader.list_templates())
+        return sorted(found)
+
+
+class _TemplateModule(ModuleType):
+    """Like a normal module but with support for weak references"""
+
+
+class ModuleLoader(BaseLoader):
+    """This loader loads templates from precompiled templates.
+
+    Example usage:
+
+    >>> loader = ModuleLoader('/path/to/compiled/templates')
+
+    Templates can be precompiled with :meth:`Environment.compile_templates`.
+    """
+
+    has_source_access = False
+
+    def __init__(
+        self,
+        path: t.Union[
+            str, "os.PathLike[str]", t.Sequence[t.Union[str, "os.PathLike[str]"]]
+        ],
+    ) -> None:
+        package_name = f"_jinja2_module_templates_{id(self):x}"
+
+        # create a fake module that looks for the templates in the
+        # path given.
+        mod = _TemplateModule(package_name)
+
+        if not isinstance(path, abc.Iterable) or isinstance(path, str):
+            path = [path]
+
+        mod.__path__ = [os.fspath(p) for p in path]
+
+        sys.modules[package_name] = weakref.proxy(
+            mod, lambda x: sys.modules.pop(package_name, None)
+        )
+
+        # the only strong reference, the sys.modules entry is weak
+        # so that the garbage collector can remove it once the
+        # loader that created it goes out of business.
+        self.module = mod
+        self.package_name = package_name
+
+    @staticmethod
+    def get_template_key(name: str) -> str:
+        return "tmpl_" + sha1(name.encode("utf-8")).hexdigest()
+
+    @staticmethod
+    def get_module_filename(name: str) -> str:
+        return ModuleLoader.get_template_key(name) + ".py"
+
+    @internalcode
+    def load(
+        self,
+        environment: "Environment",
+        name: str,
+        globals: t.Optional[t.MutableMapping[str, t.Any]] = None,
+    ) -> "Template":
+        key = self.get_template_key(name)
+        module = f"{self.package_name}.{key}"
+        mod = getattr(self.module, module, None)
+
+        if mod is None:
+            try:
+                mod = __import__(module, None, None, ["root"])
+            except ImportError as e:
+                raise TemplateNotFound(name) from e
+
+            # remove the entry from sys.modules, we only want the attribute
+            # on the module object we have stored on the loader.
+            sys.modules.pop(module, None)
+
+        if globals is None:
+            globals = {}
+
+        return environment.template_class.from_module_dict(
+            environment, mod.__dict__, globals
+        )

janus/lib/python3.10/site-packages/jinja2/sandbox.py

@@ -0,0 +1,436 @@
+"""A sandbox layer that ensures unsafe operations cannot be performed.
+Useful when the template itself comes from an untrusted source.
+"""
+
+import operator
+import types
+import typing as t
+from _string import formatter_field_name_split  # type: ignore
+from collections import abc
+from collections import deque
+from functools import update_wrapper
+from string import Formatter
+
+from markupsafe import EscapeFormatter
+from markupsafe import Markup
+
+from .environment import Environment
+from .exceptions import SecurityError
+from .runtime import Context
+from .runtime import Undefined
+
+F = t.TypeVar("F", bound=t.Callable[..., t.Any])
+
+#: maximum number of items a range may produce
+MAX_RANGE = 100000
+
+#: Unsafe function attributes.
+UNSAFE_FUNCTION_ATTRIBUTES: t.Set[str] = set()
+
+#: Unsafe method attributes. Function attributes are unsafe for methods too.
+UNSAFE_METHOD_ATTRIBUTES: t.Set[str] = set()
+
+#: unsafe generator attributes.
+UNSAFE_GENERATOR_ATTRIBUTES = {"gi_frame", "gi_code"}
+
+#: unsafe attributes on coroutines
+UNSAFE_COROUTINE_ATTRIBUTES = {"cr_frame", "cr_code"}
+
+#: unsafe attributes on async generators
+UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = {"ag_code", "ag_frame"}
+
+_mutable_spec: t.Tuple[t.Tuple[t.Type[t.Any], t.FrozenSet[str]], ...] = (
+    (
+        abc.MutableSet,
+        frozenset(
+            [
+                "add",
+                "clear",
+                "difference_update",
+                "discard",
+                "pop",
+                "remove",
+                "symmetric_difference_update",
+                "update",
+            ]
+        ),
+    ),
+    (
+        abc.MutableMapping,
+        frozenset(["clear", "pop", "popitem", "setdefault", "update"]),
+    ),
+    (
+        abc.MutableSequence,
+        frozenset(
+            ["append", "clear", "pop", "reverse", "insert", "sort", "extend", "remove"]
+        ),
+    ),
+    (
+        deque,
+        frozenset(
+            [
+                "append",
+                "appendleft",
+                "clear",
+                "extend",
+                "extendleft",
+                "pop",
+                "popleft",
+                "remove",
+                "rotate",
+            ]
+        ),
+    ),
+)
+
+
+def safe_range(*args: int) -> range:
+    """A range that can't generate ranges with a length of more than
+    MAX_RANGE items.
+    """
+    rng = range(*args)
+
+    if len(rng) > MAX_RANGE:
+        raise OverflowError(
+            "Range too big. The sandbox blocks ranges larger than"
+            f" MAX_RANGE ({MAX_RANGE})."
+        )
+
+    return rng
+
+
+def unsafe(f: F) -> F:
+    """Marks a function or method as unsafe.
+
+    .. code-block: python
+
+        @unsafe
+        def delete(self):
+            pass
+    """
+    f.unsafe_callable = True  # type: ignore
+    return f
+
+
+def is_internal_attribute(obj: t.Any, attr: str) -> bool:
+    """Test if the attribute given is an internal python attribute.  For
+    example this function returns `True` for the `func_code` attribute of
+    python objects.  This is useful if the environment method
+    :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden.
+
+    >>> from jinja2.sandbox import is_internal_attribute
+    >>> is_internal_attribute(str, "mro")
+    True
+    >>> is_internal_attribute(str, "upper")
+    False
+    """
+    if isinstance(obj, types.FunctionType):
+        if attr in UNSAFE_FUNCTION_ATTRIBUTES:
+            return True
+    elif isinstance(obj, types.MethodType):
+        if attr in UNSAFE_FUNCTION_ATTRIBUTES or attr in UNSAFE_METHOD_ATTRIBUTES:
+            return True
+    elif isinstance(obj, type):
+        if attr == "mro":
+            return True
+    elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)):
+        return True
+    elif isinstance(obj, types.GeneratorType):
+        if attr in UNSAFE_GENERATOR_ATTRIBUTES:
+            return True
+    elif hasattr(types, "CoroutineType") and isinstance(obj, types.CoroutineType):
+        if attr in UNSAFE_COROUTINE_ATTRIBUTES:
+            return True
+    elif hasattr(types, "AsyncGeneratorType") and isinstance(
+        obj, types.AsyncGeneratorType
+    ):
+        if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES:
+            return True
+    return attr.startswith("__")
+
+
+def modifies_known_mutable(obj: t.Any, attr: str) -> bool:
+    """This function checks if an attribute on a builtin mutable object
+    (list, dict, set or deque) or the corresponding ABCs would modify it
+    if called.
+
+    >>> modifies_known_mutable({}, "clear")
+    True
+    >>> modifies_known_mutable({}, "keys")
+    False
+    >>> modifies_known_mutable([], "append")
+    True
+    >>> modifies_known_mutable([], "index")
+    False
+
+    If called with an unsupported object, ``False`` is returned.
+
+    >>> modifies_known_mutable("foo", "upper")
+    False
+    """
+    for typespec, unsafe in _mutable_spec:
+        if isinstance(obj, typespec):
+            return attr in unsafe
+    return False
+
+
+class SandboxedEnvironment(Environment):
+    """The sandboxed environment.  It works like the regular environment but
+    tells the compiler to generate sandboxed code.  Additionally subclasses of
+    this environment may override the methods that tell the runtime what
+    attributes or functions are safe to access.
+
+    If the template tries to access insecure code a :exc:`SecurityError` is
+    raised.  However also other exceptions may occur during the rendering so
+    the caller has to ensure that all exceptions are caught.
+    """
+
+    sandboxed = True
+
+    #: default callback table for the binary operators.  A copy of this is
+    #: available on each instance of a sandboxed environment as
+    #: :attr:`binop_table`
+    default_binop_table: t.Dict[str, t.Callable[[t.Any, t.Any], t.Any]] = {
+        "+": operator.add,
+        "-": operator.sub,
+        "*": operator.mul,
+        "/": operator.truediv,
+        "//": operator.floordiv,
+        "**": operator.pow,
+        "%": operator.mod,
+    }
+
+    #: default callback table for the unary operators.  A copy of this is
+    #: available on each instance of a sandboxed environment as
+    #: :attr:`unop_table`
+    default_unop_table: t.Dict[str, t.Callable[[t.Any], t.Any]] = {
+        "+": operator.pos,
+        "-": operator.neg,
+    }
+
+    #: a set of binary operators that should be intercepted.  Each operator
+    #: that is added to this set (empty by default) is delegated to the
+    #: :meth:`call_binop` method that will perform the operator.  The default
+    #: operator callback is specified by :attr:`binop_table`.
+    #:
+    #: The following binary operators are interceptable:
+    #: ``//``, ``%``, ``+``, ``*``, ``-``, ``/``, and ``**``
+    #:
+    #: The default operation form the operator table corresponds to the
+    #: builtin function.  Intercepted calls are always slower than the native
+    #: operator call, so make sure only to intercept the ones you are
+    #: interested in.
+    #:
+    #: .. versionadded:: 2.6
+    intercepted_binops: t.FrozenSet[str] = frozenset()
+
+    #: a set of unary operators that should be intercepted.  Each operator
+    #: that is added to this set (empty by default) is delegated to the
+    #: :meth:`call_unop` method that will perform the operator.  The default
+    #: operator callback is specified by :attr:`unop_table`.
+    #:
+    #: The following unary operators are interceptable: ``+``, ``-``
+    #:
+    #: The default operation form the operator table corresponds to the
+    #: builtin function.  Intercepted calls are always slower than the native
+    #: operator call, so make sure only to intercept the ones you are
+    #: interested in.
+    #:
+    #: .. versionadded:: 2.6
+    intercepted_unops: t.FrozenSet[str] = frozenset()
+
+    def __init__(self, *args: t.Any, **kwargs: t.Any) -> None:
+        super().__init__(*args, **kwargs)
+        self.globals["range"] = safe_range
+        self.binop_table = self.default_binop_table.copy()
+        self.unop_table = self.default_unop_table.copy()
+
+    def is_safe_attribute(self, obj: t.Any, attr: str, value: t.Any) -> bool:
+        """The sandboxed environment will call this method to check if the
+        attribute of an object is safe to access.  Per default all attributes
+        starting with an underscore are considered private as well as the
+        special attributes of internal python objects as returned by the
+        :func:`is_internal_attribute` function.
+        """
+        return not (attr.startswith("_") or is_internal_attribute(obj, attr))
+
+    def is_safe_callable(self, obj: t.Any) -> bool:
+        """Check if an object is safely callable. By default callables
+        are considered safe unless decorated with :func:`unsafe`.
+
+        This also recognizes the Django convention of setting
+        ``func.alters_data = True``.
+        """
+        return not (
+            getattr(obj, "unsafe_callable", False) or getattr(obj, "alters_data", False)
+        )
+
+    def call_binop(
+        self, context: Context, operator: str, left: t.Any, right: t.Any
+    ) -> t.Any:
+        """For intercepted binary operator calls (:meth:`intercepted_binops`)
+        this function is executed instead of the builtin operator.  This can
+        be used to fine tune the behavior of certain operators.
+
+        .. versionadded:: 2.6
+        """
+        return self.binop_table[operator](left, right)
+
+    def call_unop(self, context: Context, operator: str, arg: t.Any) -> t.Any:
+        """For intercepted unary operator calls (:meth:`intercepted_unops`)
+        this function is executed instead of the builtin operator.  This can
+        be used to fine tune the behavior of certain operators.
+
+        .. versionadded:: 2.6
+        """
+        return self.unop_table[operator](arg)
+
+    def getitem(
+        self, obj: t.Any, argument: t.Union[str, t.Any]
+    ) -> t.Union[t.Any, Undefined]:
+        """Subscribe an object from sandboxed code."""
+        try:
+            return obj[argument]
+        except (TypeError, LookupError):
+            if isinstance(argument, str):
+                try:
+                    attr = str(argument)
+                except Exception:
+                    pass
+                else:
+                    try:
+                        value = getattr(obj, attr)
+                    except AttributeError:
+                        pass
+                    else:
+                        fmt = self.wrap_str_format(value)
+                        if fmt is not None:
+                            return fmt
+                        if self.is_safe_attribute(obj, argument, value):
+                            return value
+                        return self.unsafe_undefined(obj, argument)
+        return self.undefined(obj=obj, name=argument)
+
+    def getattr(self, obj: t.Any, attribute: str) -> t.Union[t.Any, Undefined]:
+        """Subscribe an object from sandboxed code and prefer the
+        attribute.  The attribute passed *must* be a bytestring.
+        """
+        try:
+            value = getattr(obj, attribute)
+        except AttributeError:
+            try:
+                return obj[attribute]
+            except (TypeError, LookupError):
+                pass
+        else:
+            fmt = self.wrap_str_format(value)
+            if fmt is not None:
+                return fmt
+            if self.is_safe_attribute(obj, attribute, value):
+                return value
+            return self.unsafe_undefined(obj, attribute)
+        return self.undefined(obj=obj, name=attribute)
+
+    def unsafe_undefined(self, obj: t.Any, attribute: str) -> Undefined:
+        """Return an undefined object for unsafe attributes."""
+        return self.undefined(
+            f"access to attribute {attribute!r} of"
+            f" {type(obj).__name__!r} object is unsafe.",
+            name=attribute,
+            obj=obj,
+            exc=SecurityError,
+        )
+
+    def wrap_str_format(self, value: t.Any) -> t.Optional[t.Callable[..., str]]:
+        """If the given value is a ``str.format`` or ``str.format_map`` method,
+        return a new function than handles sandboxing. This is done at access
+        rather than in :meth:`call`, so that calls made without ``call`` are
+        also sandboxed.
+        """
+        if not isinstance(
+            value, (types.MethodType, types.BuiltinMethodType)
+        ) or value.__name__ not in ("format", "format_map"):
+            return None
+
+        f_self: t.Any = value.__self__
+
+        if not isinstance(f_self, str):
+            return None
+
+        str_type: t.Type[str] = type(f_self)
+        is_format_map = value.__name__ == "format_map"
+        formatter: SandboxedFormatter
+
+        if isinstance(f_self, Markup):
+            formatter = SandboxedEscapeFormatter(self, escape=f_self.escape)
+        else:
+            formatter = SandboxedFormatter(self)
+
+        vformat = formatter.vformat
+
+        def wrapper(*args: t.Any, **kwargs: t.Any) -> str:
+            if is_format_map:
+                if kwargs:
+                    raise TypeError("format_map() takes no keyword arguments")
+
+                if len(args) != 1:
+                    raise TypeError(
+                        f"format_map() takes exactly one argument ({len(args)} given)"
+                    )
+
+                kwargs = args[0]
+                args = ()
+
+            return str_type(vformat(f_self, args, kwargs))
+
+        return update_wrapper(wrapper, value)
+
+    def call(
+        __self,  # noqa: B902
+        __context: Context,
+        __obj: t.Any,
+        *args: t.Any,
+        **kwargs: t.Any,
+    ) -> t.Any:
+        """Call an object from sandboxed code."""
+
+        # the double prefixes are to avoid double keyword argument
+        # errors when proxying the call.
+        if not __self.is_safe_callable(__obj):
+            raise SecurityError(f"{__obj!r} is not safely callable")
+        return __context.call(__obj, *args, **kwargs)
+
+
+class ImmutableSandboxedEnvironment(SandboxedEnvironment):
+    """Works exactly like the regular `SandboxedEnvironment` but does not
+    permit modifications on the builtin mutable objects `list`, `set`, and
+    `dict` by using the :func:`modifies_known_mutable` function.
+    """
+
+    def is_safe_attribute(self, obj: t.Any, attr: str, value: t.Any) -> bool:
+        if not super().is_safe_attribute(obj, attr, value):
+            return False
+
+        return not modifies_known_mutable(obj, attr)
+
+
+class SandboxedFormatter(Formatter):
+    def __init__(self, env: Environment, **kwargs: t.Any) -> None:
+        self._env = env
+        super().__init__(**kwargs)
+
+    def get_field(
+        self, field_name: str, args: t.Sequence[t.Any], kwargs: t.Mapping[str, t.Any]
+    ) -> t.Tuple[t.Any, str]:
+        first, rest = formatter_field_name_split(field_name)
+        obj = self.get_value(first, args, kwargs)
+        for is_attr, i in rest:
+            if is_attr:
+                obj = self._env.getattr(obj, i)
+            else:
+                obj = self._env.getitem(obj, i)
+        return obj, first
+
+
+class SandboxedEscapeFormatter(SandboxedFormatter, EscapeFormatter):
+    pass

janus/lib/python3.10/site-packages/networkx-3.4.2.dist-info/top_level.txt

@@ -0,0 +1 @@
+networkx