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Also it's much faster than ``asyncio.wait_for()`` +because ``timeout`` doesn't create a new task. + +The ``timeout(timeout, *, loop=None)`` call returns a context manager +that cancels a block on *timeout* expiring:: + + async with timeout(1.5): + await inner() + +1. If ``inner()`` is executed faster than in ``1.5`` seconds nothing + happens. +2. Otherwise ``inner()`` is cancelled internally by sending + ``asyncio.CancelledError`` into but ``asyncio.TimeoutError`` is + raised outside of context manager scope. + +*timeout* parameter could be ``None`` for skipping timeout functionality. + + +Context manager has ``.expired`` property for check if timeout happens +exactly in context manager:: + + async with timeout(1.5) as cm: + await inner() + print(cm.expired) + +The property is ``True`` if ``inner()`` execution is cancelled by +timeout context manager. + +If ``inner()`` call explicitly raises ``TimeoutError`` ``cm.expired`` +is ``False``. + +Installation +------------ + +:: + + $ pip install async-timeout + +The library is Python 3 only! + + + +Authors and License +------------------- + +The module is written by Andrew Svetlov. + +It's *Apache 2* licensed and freely available. + + +CHANGES +======= + +3.0.1 (2018-10-09) +------------------ + +- More aggressive typing (#48) + +3.0.0 (2018-05-05) +------------------ + +- Drop Python 3.4, the minimal supported version is Python 3.5.3 + +- Provide type annotations + +2.0.1 (2018-03-13) +------------------ + +* Fix ``PendingDeprecationWarning`` on Python 3.7 (#33) + + +2.0.0 (2017-10-09) +------------------ + +* Changed `timeout <= 0` behaviour + + * Backward incompatibility change, prior this version `0` was + shortcut for `None` + * when timeout <= 0 `TimeoutError` raised faster + +1.4.0 (2017-09-09) +------------------ + +* Implement `remaining` property (#20) + + * If timeout is not started yet or started unconstrained: + `remaining` is `None` + * If timeout is expired: `remaining` is `0.0` + * All others: roughly amount of time before `TimeoutError` is triggered + +1.3.0 (2017-08-23) +------------------ + +* Don't suppress nested exception on timeout. Exception context points + on cancelled line with suspended `await` (#13) + +* Introduce `.timeout` property (#16) + +* Add methods for using as async context manager (#9) + +1.2.1 (2017-05-02) +------------------ + +* Support unpublished event loop's "current_task" api. + + +1.2.0 (2017-03-11) +------------------ + +* Extra check on context manager exit + +* 0 is no-op timeout + + +1.1.0 (2016-10-20) +------------------ + +* Rename to `async-timeout` + +1.0.0 (2016-09-09) +------------------ + +* The first release. + + diff --git a/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/RECORD b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/RECORD new file mode 100644 index 0000000000..8979fc35ac --- /dev/null +++ b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/RECORD @@ -0,0 +1,7 @@ +async_timeout/__init__.py,sha256=mGvWOoRqLtScEU3kmzqtTSH7EQsHvu8zhgHxOTXCn7c,3654 +async_timeout/py.typed,sha256=9LJP7QJ0oxYYrBtmXuFirzMbS3D9_3Tz-d3tyUtNp0U,11 +async_timeout-3.0.1.dist-info/LICENSE,sha256=tAkwu8-AdEyGxGoSvJ2gVmQdcicWw3j1ZZueVV74M-E,11357 +async_timeout-3.0.1.dist-info/METADATA,sha256=_3ByJ8L0-cU5wWu75_Rl8n0ZkbSCgW15fMAu_DzwTm0,4013 +async_timeout-3.0.1.dist-info/WHEEL,sha256=-ZFxwj8mZJPIVcZGLrsQ8UGRcxVAOExzPLVBGR7u7bE,92 +async_timeout-3.0.1.dist-info/top_level.txt,sha256=9oM4e7Twq8iD_7_Q3Mz0E6GPIB6vJvRFo-UBwUQtBDU,14 +async_timeout-3.0.1.dist-info/RECORD,, diff --git a/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/WHEEL b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/WHEEL new file mode 100644 index 0000000000..f87af075c0 --- /dev/null +++ b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/WHEEL @@ -0,0 +1,5 @@ +Wheel-Version: 1.0 +Generator: bdist_wheel (0.32.1) +Root-Is-Purelib: true +Tag: py3-none-any + diff --git a/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/top_level.txt b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/top_level.txt new file mode 100644 index 0000000000..ad29955ef9 --- /dev/null +++ b/third_party/python/async_timeout/async_timeout-3.0.1.dist-info/top_level.txt @@ -0,0 +1 @@ +async_timeout diff --git a/third_party/python/async_timeout/async_timeout/__init__.py b/third_party/python/async_timeout/async_timeout/__init__.py new file mode 100644 index 0000000000..dcc55f0cea --- /dev/null +++ b/third_party/python/async_timeout/async_timeout/__init__.py @@ -0,0 +1,115 @@ +import asyncio +import sys + +from types import TracebackType +from typing import Optional, Type, Any # noqa + + +__version__ = '3.0.1' + +PY_37 = sys.version_info >= (3, 7) + + +class timeout: + """timeout context manager. + + Useful in cases when you want to apply timeout logic around block + of code or in cases when asyncio.wait_for is not suitable. For example: + + >>> with timeout(0.001): + ... async with aiohttp.get('https://github.com') as r: + ... await r.text() + + + timeout - value in seconds or None to disable timeout logic + loop - asyncio compatible event loop + """ + def __init__(self, timeout: Optional[float], + *, loop: Optional[asyncio.AbstractEventLoop] = None) -> None: + self._timeout = timeout + if loop is None: + loop = asyncio.get_event_loop() + self._loop = loop + self._task = None # type: Optional[asyncio.Task[Any]] + self._cancelled = False + self._cancel_handler = None # type: Optional[asyncio.Handle] + self._cancel_at = None # type: Optional[float] + + def __enter__(self) -> 'timeout': + return self._do_enter() + + def __exit__(self, + exc_type: Type[BaseException], + exc_val: BaseException, + exc_tb: TracebackType) -> Optional[bool]: + self._do_exit(exc_type) + return None + + async def __aenter__(self) -> 'timeout': + return self._do_enter() + + async def __aexit__(self, + exc_type: Type[BaseException], + exc_val: BaseException, + exc_tb: TracebackType) -> None: + self._do_exit(exc_type) + + @property + def expired(self) -> bool: + return self._cancelled + + @property + def remaining(self) -> Optional[float]: + if self._cancel_at is not None: + return max(self._cancel_at - self._loop.time(), 0.0) + else: + return None + + def _do_enter(self) -> 'timeout': + # Support Tornado 5- without timeout + # Details: https://github.com/python/asyncio/issues/392 + if self._timeout is None: + return self + + self._task = current_task(self._loop) + if self._task is None: + raise RuntimeError('Timeout context manager should be used ' + 'inside a task') + + if self._timeout <= 0: + self._loop.call_soon(self._cancel_task) + return self + + self._cancel_at = self._loop.time() + self._timeout + self._cancel_handler = self._loop.call_at( + self._cancel_at, self._cancel_task) + return self + + def _do_exit(self, exc_type: Type[BaseException]) -> None: + if exc_type is asyncio.CancelledError and self._cancelled: + self._cancel_handler = None + self._task = None + raise asyncio.TimeoutError + if self._timeout is not None and self._cancel_handler is not None: + self._cancel_handler.cancel() + self._cancel_handler = None + self._task = None + return None + + def _cancel_task(self) -> None: + if self._task is not None: + self._task.cancel() + self._cancelled = True + + +def current_task(loop: asyncio.AbstractEventLoop) -> 'asyncio.Task[Any]': + if PY_37: + task = asyncio.current_task(loop=loop) # type: ignore + else: + task = asyncio.Task.current_task(loop=loop) + if task is None: + # this should be removed, tokio must use register_task and family API + if hasattr(loop, 'current_task'): + task = loop.current_task() # type: ignore + + return task diff --git a/third_party/python/async_timeout/async_timeout/py.typed b/third_party/python/async_timeout/async_timeout/py.typed new file mode 100644 index 0000000000..f6e0339af6 --- /dev/null +++ b/third_party/python/async_timeout/async_timeout/py.typed @@ -0,0 +1 @@ +Placeholder
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