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bpo-40607: Reraise exception during task cancelation in asyncio.wait_for() (GH-20054)

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Currently, if asyncio.wait_for() timeout expires, it cancels
inner future and then always raises TimeoutError. In case
those future is task, it can handle cancelation mannually,
and those process can lead to some other exception. Current
implementation silently loses thoses exception.

To resolve this, wait_for will check was the cancelation
successfull or not. In case there was exception, wait_for
will reraise it.

Co-authored-by: Roman Skurikhin <roman.skurikhin@cruxlab.com>
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romasku 2020-05-15 23:12:05 +03:00 • committed by GitHub
parent c087a268a4
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3
Doc/library/asyncio-task.rst
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@ -453,7 +453,8 @@ Timeouts
wrap it in :func:`shield`.
The function will wait until the future is actually cancelled,
so the total wait time may exceed the *timeout*.
so the total wait time may exceed the *timeout*. If an exception
happens during cancellation, it is propagated.
If the wait is cancelled, the future *aw* is also cancelled.