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import threading
from types import TracebackType
from typing import Optional, Type
import sniffio
from ._exceptions import ExceptionMapping, PoolTimeout, map_exceptions
# Our async synchronization primatives use either 'anyio' or 'trio' depending
# on if they're running under asyncio or trio.
#
# We take care to only lazily import whichever of these two we need.
class AsyncLock:
def __init__(self) -> None:
self._backend = ""
def setup(self) -> None:
"""
Detect if we're running under 'asyncio' or 'trio' and create
a lock with the correct implementation.
"""
self._backend = sniffio.current_async_library()
if self._backend == "trio":
import trio
self._trio_lock = trio.Lock()
else:
import anyio
self._anyio_lock = anyio.Lock()
async def __aenter__(self) -> "AsyncLock":
if not self._backend:
self.setup()
if self._backend == "trio":
await self._trio_lock.acquire()
else:
await self._anyio_lock.acquire()
return self
async def __aexit__(
self,
exc_type: Optional[Type[BaseException]] = None,
exc_value: Optional[BaseException] = None,
traceback: Optional[TracebackType] = None,
) -> None:
if self._backend == "trio":
self._trio_lock.release()
else:
self._anyio_lock.release()
class AsyncEvent:
def __init__(self) -> None:
self._backend = ""
def setup(self) -> None:
"""
Detect if we're running under 'asyncio' or 'trio' and create
a lock with the correct implementation.
"""
self._backend = sniffio.current_async_library()
if self._backend == "trio":
import trio
self._trio_event = trio.Event()
else:
import anyio
self._anyio_event = anyio.Event()
def set(self) -> None:
if not self._backend:
self.setup()
if self._backend == "trio":
self._trio_event.set()
else:
self._anyio_event.set()
async def wait(self, timeout: Optional[float] = None) -> None:
if not self._backend:
self.setup()
if self._backend == "trio":
import trio
trio_exc_map: ExceptionMapping = {trio.TooSlowError: PoolTimeout}
timeout_or_inf = float("inf") if timeout is None else timeout
with map_exceptions(trio_exc_map):
with trio.fail_after(timeout_or_inf):
await self._trio_event.wait()
else:
import anyio
anyio_exc_map: ExceptionMapping = {TimeoutError: PoolTimeout}
with map_exceptions(anyio_exc_map):
with anyio.fail_after(timeout):
await self._anyio_event.wait()
class AsyncSemaphore:
def __init__(self, bound: int) -> None:
self._bound = bound
self._backend = ""
def setup(self) -> None:
"""
Detect if we're running under 'asyncio' or 'trio' and create
a semaphore with the correct implementation.
"""
self._backend = sniffio.current_async_library()
if self._backend == "trio":
import trio
self._trio_semaphore = trio.Semaphore(
initial_value=self._bound, max_value=self._bound
)
else:
import anyio
self._anyio_semaphore = anyio.Semaphore(
initial_value=self._bound, max_value=self._bound
)
async def acquire(self) -> None:
if not self._backend:
self.setup()
if self._backend == "trio":
await self._trio_semaphore.acquire()
else:
await self._anyio_semaphore.acquire()
async def release(self) -> None:
if self._backend == "trio":
self._trio_semaphore.release()
else:
self._anyio_semaphore.release()
# Our thread-based synchronization primitives...
class Lock:
def __init__(self) -> None:
self._lock = threading.Lock()
def __enter__(self) -> "Lock":
self._lock.acquire()
return self
def __exit__(
self,
exc_type: Optional[Type[BaseException]] = None,
exc_value: Optional[BaseException] = None,
traceback: Optional[TracebackType] = None,
) -> None:
self._lock.release()
class Event:
def __init__(self) -> None:
self._event = threading.Event()
def set(self) -> None:
self._event.set()
def wait(self, timeout: Optional[float] = None) -> None:
if not self._event.wait(timeout=timeout):
raise PoolTimeout() # pragma: nocover
class Semaphore:
def __init__(self, bound: int) -> None:
self._semaphore = threading.Semaphore(value=bound)
def acquire(self) -> None:
self._semaphore.acquire()
def release(self) -> None:
self._semaphore.release()
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