8000 Refactor asyncio.wait_for() by asvetlov · Pull Request #31847 · python/cpython · GitHub
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Refactor asyncio.wait_for() #31847

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Refactor asyncio.wait_for() #31847

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80590ab
Implement wait_for on top on timeout() and TaskGroup()
asvetlov Mar 13, 2022
5e25891
TaskGroup is not required here
asvetlov Mar 13, 2022
b196632
Merge branch 'main' into refactor-wait_for
asvetlov Mar 16, 2022
a700725
Cancel the inner task
asvetlov Mar 16, 2022
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Cancel the inner task
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@asvetlov
asvetlov committed Mar 16, 2022
commit a7007258bc028835a92b3b638f3db61ad8c5e01a
9 changes: 4 additions & 5 deletions Lib/asyncio/tasks.py
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Expand Up @@ -444,12 +444,11 @@ async def wait_for(fut, timeout):
This function is a coroutine.
"""

if not futures.isfuture(fut):
# wrap a coroutine
fut = create_task(fut)
async def inner():
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@graingert graingert Jul 20, 2022 •
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@asvetlov I've been having a go at this branch in bf594bd

you need to special case None in asyncio.wait_for(

Suggested change
async def inner():
if timeout is None:
return await fut
async def inner():

and then special case 0 in timeouts.timeout see https://gist.github.com/graingert/ea2546b23b32be5a4493a9a115db2eff#file-timeout_bug-py-L6

async with timeouts.timeout(timeout):
return await fut

async with timeouts.timeout(timeout):
return await fut
return await create_task(inner())
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@graingert graingert Jul 21, 2022 •
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I don't think this extra create_task is worth it, the tests it passes are equivalent to:

async def wait_for(fut, delay):
    if delay is None:
        return await fut
    if delay <= 0:
        if asyncio.iscoroutine(fut):
            fut.close()
            raise TimeoutError

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I think it would be better to skip this create_task and delete the tests that fail



async def _wait(fs, timeout, return_when, loop):
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