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import asyncio
from collections import deque
from collections.abc import Awaitable, Callable
from typing import Any
from loguru import logger
from free_claude_code.core.rate_limit import (
StrictSlidingWindowLimiter as SlidingWindowLimiter,
)
from .safe_diagnostics import format_exception_for_log
class MessagingRateLimiter:
"""
Rate limiter and compacting work queue for one messaging runtime.
Uses a custom queue with task compaction (deduplication) to ensure
only the latest version of a message update is processed.
"""
def __init__(
self,
*,
rate_limit: int,
rate_window: float,
log_error_details: bool = False,
) -> None:
self.limiter = SlidingWindowLimiter(rate_limit, rate_window)
self._log_error_details = log_error_details
# Custom queue state - using deque for O(1) popleft
self._queue_list: deque[str] = deque() # Deque of dedup_keys in order
self._queue_map: dict[
str, tuple[Callable[[], Awaitable[Any]], list[asyncio.Future]]
] = {}
self._condition = asyncio.Condition()
self._shutdown = asyncio.Event()
self._worker_task: asyncio.Task[None] | None = None
self._background_tasks: set[asyncio.Task[None]] = set()
self._active_futures: list[asyncio.Future[Any]] = []
self._closed = False
self._paused_until = 0
logger.info(
f"MessagingRateLimiter initialized ({rate_limit} req / {rate_window}s with Task Compaction)"
)
def start(self) -> None:
"""Start the owned worker on the current event loop."""
if self._closed:
raise RuntimeError("Messaging rate limiter is closed.")
if self._worker_task and not self._worker_task.done():
return
self._worker_task = asyncio.create_task(
self._worker(), name="msg-limiter-worker"
)
async def _worker(self) -> None:
"""Background worker that processes queued messaging tasks."""
logger.info("MessagingRateLimiter worker started")
while not self._shutdown.is_set():
try:
# Get a task from the queue
async with self._condition:
while not self._queue_list and not self._shutdown.is_set():
await self._condition.wait()
if self._shutdown.is_set():
break
dedup_key = self._queue_list.popleft()
func, futures = self._queue_map.pop(dedup_key)
self._active_futures = futures
# Check for manual pause (FloodWait)
now = asyncio.get_event_loop().time()
if self._paused_until > now:
wait_time = self._paused_until - now
logger.warning(
f"Limiter worker paused, waiting {wait_time:.1f}s more..."
)
await asyncio.sleep(wait_time)
# Wait for rate limit capacity
async with self.limiter:
try:
result = await func()
for f in futures:
if not f.done():
f.set_result(result)
except asyncio.CancelledError:
for f in futures:
if not f.done():
f.cancel()
worker = asyncio.current_task()
if self._shutdown.is_set() or (
worker is not None and worker.cancelling()
):
raise
logger.debug(
"Messaging operation cancelled for key {}; worker remains active",
dedup_key,
)
except Exception as e:
# Report error to all futures and log it
for f in futures:
if not f.done():
f.set_exception(e)
error_msg = str(e).lower()
if "flood" in error_msg or "wait" in error_msg:
seconds = 30
try:
if hasattr(e, "seconds"):
seconds = e.seconds
elif "after " in error_msg:
# Try to parse "retry after X"
parts = error_msg.split("after ")
if len(parts) > 1:
seconds = int(parts[1].split()[0])
except Exception:
pass
logger.error(
f"FloodWait detected! Pausing worker for {seconds}s"
)
wait_secs = (
float(seconds)
if isinstance(seconds, (int, float, str))
else 30.0
)
self._paused_until = (
asyncio.get_event_loop().time() + wait_secs
)
else:
logger.error(
"Error in limiter worker for key {}: {}",
dedup_key,
format_exception_for_log(
e,
log_full_message=self._log_error_details,
),
)
finally:
self._active_futures = []
except asyncio.CancelledError:
for future in self._active_futures:
if not future.done():
future.cancel()
self._active_futures = []
if self._shutdown.is_set():
break
raise
except Exception as e:
if self._log_error_details:
logger.error(
"MessagingRateLimiter worker critical error: {}",
e,
exc_info=True,
)
else:
logger.error(
"MessagingRateLimiter worker critical error: exc_type={}",
type(e).__name__,
)
await asyncio.sleep(1)
async def shutdown(self, timeout: float | None = None) -> None:
"""Cancel queued work and stop every task owned by this limiter."""
self._closed = True
self._shutdown.set()
async with self._condition:
queued_futures = [
future
for _func, futures in self._queue_map.values()
for future in futures
]
self._queue_list.clear()
self._queue_map.clear()
for future in queued_futures:
if not future.done():
future.cancel()
for future in self._active_futures:
if not future.done():
future.cancel()
self._condition.notify_all()
cancellation: asyncio.CancelledError | None = None
timeout_error: TimeoutError | None = None
task = self._worker_task
if task and not task.done():
task.cancel()
try:
drain = asyncio.gather(task, return_exceptions=True)
if timeout is None:
await drain
else:
await asyncio.wait_for(drain, timeout=timeout)
except TimeoutError as exc:
timeout_error = exc
except asyncio.CancelledError as exc:
cancellation = exc
if task is None or task.done():
self._worker_task = None
background_tasks = tuple(self._background_tasks)
for background_task in background_tasks:
background_task.cancel()
if background_tasks:
try:
await asyncio.gather(*background_tasks, return_exceptions=True)
except asyncio.CancelledError as exc:
cancellation = exc
self._background_tasks.difference_update(
task for task in background_tasks if task.done()
)
if cancellation is not None:
raise cancellation
if timeout_error is not None:
raise TimeoutError(
"MessagingRateLimiter worker did not stop before timeout"
) from timeout_error
async def _enqueue_internal(
self,
func: Callable[[], Awaitable[Any]],
future: asyncio.Future[Any],
dedup_key: str,
front: bool = False,
) -> None:
await self._enqueue_internal_multi(func, [future], dedup_key, front)
async def _enqueue_internal_multi(
self,
func: Callable[[], Awaitable[Any]],
futures: list[asyncio.Future[Any]],
dedup_key: str,
front: bool = False,
) -> None:
async with self._condition:
if self._closed:
raise RuntimeError("Messaging rate limiter is closed.")
if self._worker_task is None or self._worker_task.done():
raise RuntimeError("Messaging rate limiter has not been started.")
if dedup_key in self._queue_map:
# Compaction: Update existing task with new func, append new futures
_old_func, old_futures = self._queue_map[dedup_key]
old_futures.extend(futures)
self._queue_map[dedup_key] = (func, old_futures)
logger.debug(
f"Compacted task for key: {dedup_key} (now {len(old_futures)} futures)"
)
else:
self._queue_map[dedup_key] = (func, futures)
if front:
self._queue_list.appendleft(dedup_key)
else:
self._queue_list.append(dedup_key)
self._condition.notify_all()
async def enqueue(
self, func: Callable[[], Awaitable[Any]], dedup_key: str | None = None
) -> Any:
"""
Enqueue a messaging task and return its future result.
If dedup_key is provided, subsequent tasks with the same key will replace this one.
"""
self._require_running()
if dedup_key is None:
# Unique key to avoid deduplication
dedup_key = f"task_{id(func)}_{asyncio.get_running_loop().time()}"
future = asyncio.get_running_loop().create_future()
try:
await self._enqueue_internal(func, future, dedup_key)
except BaseException:
future.cancel()
raise
return await future
def fire_and_forget(
self, func: Callable[[], Awaitable[Any]], dedup_key: str | None = None
) -> None:
"""Enqueue a task without waiting for the result."""
self._require_running()
if dedup_key is None:
dedup_key = f"task_{id(func)}_{asyncio.get_running_loop().time()}"
async def _wrapped() -> None:
max_retries = 2
for attempt in range(max_retries + 1):
try:
await self.enqueue(func, dedup_key)
return
except Exception as e:
error_msg = str(e).lower()
# Only retry transient connectivity issues that might have slipped through
# or occurred between platform checks.
if attempt < max_retries and any(
x in error_msg for x in ["connect", "timeout", "broken"]
):
wait = 2**attempt
if self._log_error_details:
logger.warning(
"Limiter fire_and_forget transient error (attempt {}): {}. Retrying in {}s...",
attempt + 1,
e,
wait,
)
else:
logger.warning(
"Limiter fire_and_forget transient error (attempt {}): exc_type={}. Retrying in {}s...",
attempt + 1,
type(e).__name__,
wait,
)
await asyncio.sleep(wait)
continue
logger.error(
"Final error in fire_and_forget for key {}: {}",
dedup_key,
format_exception_for_log(
e,
log_full_message=self._log_error_details,
),
)
break
task = asyncio.create_task(_wrapped(), name=f"msg-limiter:{dedup_key}")
self._background_tasks.add(task)
task.add_done_callback(self._background_tasks.discard)
def _require_running(self) -> None:
if self._closed:
raise RuntimeError("Messaging rate limiter is closed.")
if self._worker_task is None or self._worker_task.done():
raise RuntimeError("Messaging rate limiter has not been started.")
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