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Metadata-Version: 2.1
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Name: async-timeout
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Version: 5.0.1
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Summary: Timeout context manager for asyncio programs
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Home-page: https://github.com/aio-libs/async-timeout
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Author: Andrew Svetlov <andrew.svetlov@gmail.com>
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Author-email: andrew.svetlov@gmail.com
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License: Apache 2
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Project-URL: Chat: Gitter, https://gitter.im/aio-libs/Lobby
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Project-URL: CI: GitHub Actions, https://github.com/aio-libs/async-timeout/actions
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Project-URL: Coverage: codecov, https://codecov.io/github/aio-libs/async-timeout
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Project-URL: GitHub: issues, https://github.com/aio-libs/async-timeout/issues
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Project-URL: GitHub: repo, https://github.com/aio-libs/async-timeout
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Classifier: Development Status :: 5 - Production/Stable
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Classifier: Topic :: Software Development :: Libraries
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Classifier: Framework :: AsyncIO
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Classifier: Intended Audience :: Developers
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Classifier: License :: OSI Approved :: Apache Software License
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Classifier: Programming Language :: Python
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Classifier: Programming Language :: Python :: 3
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Classifier: Programming Language :: Python :: 3 :: Only
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Requires-Python: >=3.8
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Description-Content-Type: text/x-rst
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License-File: LICENSE
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async-timeout
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=============
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.. image:: https://travis-ci.com/aio-libs/async-timeout.svg?branch=master
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:target: https://travis-ci.com/aio-libs/async-timeout
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.. image:: https://codecov.io/gh/aio-libs/async-timeout/branch/master/graph/badge.svg
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:target: https://codecov.io/gh/aio-libs/async-timeout
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.. image:: https://img.shields.io/pypi/v/async-timeout.svg
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:target: https://pypi.python.org/pypi/async-timeout
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.. image:: https://badges.gitter.im/Join%20Chat.svg
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:target: https://gitter.im/aio-libs/Lobby
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:alt: Chat on Gitter
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asyncio-compatible timeout context manager.
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DEPRECATED
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----------
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This library has effectively been upstreamed into Python 3.11+.
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Therefore this library is considered deprecated and no longer actively supported.
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Version 5.0+ provides dual-mode when executed on Python 3.11+:
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``asyncio_timeout.Timeout`` is fully compatible with ``asyncio.Timeout`` *and* old
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versions of the library.
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Anyway, using upstream is highly recommended. ``asyncio_timeout`` exists only for the
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sake of backward compatibility, easy supporting both old and new Python by the same
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code, and easy misgration.
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If rescheduling API is not important and only ``async with timeout(...): ...`` functionality is required,
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a user could apply conditional import::
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if sys.version_info >= (3, 11):
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from asyncio import timeout, timeout_at
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else:
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from async_timeout import timeout, timeout_at
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Usage example
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-------------
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The context manager is useful in cases when you want to apply timeout
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logic around block of code or in cases when ``asyncio.wait_for()`` is
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not suitable. Also it's much faster than ``asyncio.wait_for()``
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because ``timeout`` doesn't create a new task.
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The ``timeout(delay, *, loop=None)`` call returns a context manager
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that cancels a block on *timeout* expiring::
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from async_timeout import timeout
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async with timeout(1.5):
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await inner()
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1. If ``inner()`` is executed faster than in ``1.5`` seconds nothing
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happens.
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2. Otherwise ``inner()`` is cancelled internally by sending
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``asyncio.CancelledError`` into but ``asyncio.TimeoutError`` is
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raised outside of context manager scope.
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*timeout* parameter could be ``None`` for skipping timeout functionality.
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Alternatively, ``timeout_at(when)`` can be used for scheduling
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at the absolute time::
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loop = asyncio.get_event_loop()
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now = loop.time()
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async with timeout_at(now + 1.5):
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await inner()
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Please note: it is not POSIX time but a time with
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undefined starting base, e.g. the time of the system power on.
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Context manager has ``.expired()`` / ``.expired`` for check if timeout happens
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exactly in context manager::
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async with timeout(1.5) as cm:
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await inner()
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print(cm.expired()) # recommended api
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print(cm.expired) # compatible api
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The property is ``True`` if ``inner()`` execution is cancelled by
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timeout context manager.
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If ``inner()`` call explicitly raises ``TimeoutError`` ``cm.expired``
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is ``False``.
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The scheduled deadline time is available as ``.when()`` / ``.deadline``::
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async with timeout(1.5) as cm:
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cm.when() # recommended api
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cm.deadline # compatible api
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Not finished yet timeout can be rescheduled by ``shift()``
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or ``update()`` methods::
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async with timeout(1.5) as cm:
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# recommended api
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cm.reschedule(cm.when() + 1) # add another second on waiting
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# compatible api
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cm.shift(1) # add another second on waiting
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cm.update(loop.time() + 5) # reschedule to now+5 seconds
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Rescheduling is forbidden if the timeout is expired or after exit from ``async with``
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code block.
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Disable scheduled timeout::
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async with timeout(1.5) as cm:
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cm.reschedule(None) # recommended api
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cm.reject() # compatible api
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Installation
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------------
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::
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$ pip install async-timeout
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The library is Python 3 only!
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Authors and License
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-------------------
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The module is written by Andrew Svetlov.
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It's *Apache 2* licensed and freely available.
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Davidson Gomes