Fix a warning about unfinished task in web_protocol.py #4415
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Nov 30, 2019
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Is it possible to test this? |
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Not sure. |
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I think the problem here is, that the RequestHandler.start() function hangs when waiting for self._waiter and the start() function will never finish. In connection_lost() we should cancel self._waiter to let the RequestHandler.start() function return. |
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@semiworks you are right, I've updated the patch |
💔 Backport was not successfulThe PR was attempted backported to the following branches:
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asvetlov
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H--o-l
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Apr 29, 2022
`asyncio.CancelledError()` on peer disconnection have been removed by aio-libs#4080, but aio-libs#4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by aio-libs#4415, but aio-libs#4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both aio-libs#4080 and aio-libs#4415 will be fixed. To test that I re-resolved aio-libs#4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce aio-libs#4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`.
H--o-l
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Apr 29, 2022
`asyncio.CancelledError()` on peer disconnection have been removed by aio-libs#4080, but aio-libs#4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by aio-libs#4415, but aio-libs#4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both aio-libs#4080 and aio-libs#4415 will be fixed. To test that I re-resolved aio-libs#4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce aio-libs#4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because aio-libs#4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. fixes aio-libs#6719
H--o-l
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Apr 29, 2022
`asyncio.CancelledError()` on peer disconnection have been removed by aio-libs#4080, but aio-libs#4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by aio-libs#4415, but aio-libs#4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both aio-libs#4080 and aio-libs#4415 will be fixed. To test that I re-resolved aio-libs#4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce aio-libs#4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because aio-libs#4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes aio-libs#6719
H--o-l
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Apr 29, 2022
`asyncio.CancelledError()` on peer disconnection have been removed by aio-libs#4080, but aio-libs#4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by aio-libs#4415, but aio-libs#4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both aio-libs#4080 and aio-libs#4415 will be fixed. To test that I re-resolved aio-libs#4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce aio-libs#4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because aio-libs#4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes aio-libs#6719
Dreamsorcerer
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May 8, 2022
* Fix asyncio.CancelledError again (#6719) `asyncio.CancelledError()` on peer disconnection have been removed by #4080, but #4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by #4415, but #4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both #4080 and #4415 will be fixed. To test that I re-resolved #4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce #4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because #4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes #6719 * Update 6719.bugfix Co-authored-by: Sam Bull <aa6bs0@sambull.org>
patchback bot
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May 8, 2022
* Fix asyncio.CancelledError again (#6719) `asyncio.CancelledError()` on peer disconnection have been removed by #4080, but #4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by #4415, but #4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both #4080 and #4415 will be fixed. To test that I re-resolved #4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce #4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because #4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes #6719 * Update 6719.bugfix Co-authored-by: Sam Bull <aa6bs0@sambull.org> (cherry picked from commit adeece3)
patchback bot
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May 8, 2022
* Fix asyncio.CancelledError again (#6719) `asyncio.CancelledError()` on peer disconnection have been removed by #4080, but #4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by #4415, but #4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both #4080 and #4415 will be fixed. To test that I re-resolved #4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce #4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because #4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes #6719 * Update 6719.bugfix Co-authored-by: Sam Bull <aa6bs0@sambull.org> (cherry picked from commit adeece3)
Dreamsorcerer
pushed a commit
that referenced
this pull request
May 8, 2022
* Fix asyncio.CancelledError again (#6719) `asyncio.CancelledError()` on peer disconnection have been removed by #4080, but #4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by #4415, but #4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both #4080 and #4415 will be fixed. To test that I re-resolved #4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce #4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because #4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes #6719 * Update 6719.bugfix Co-authored-by: Sam Bull <aa6bs0@sambull.org> (cherry picked from commit adeece3) Co-authored-by: Hoel IRIS <hoel.iris@gmail.com>
Dreamsorcerer
pushed a commit
that referenced
this pull request
May 8, 2022
* Fix asyncio.CancelledError again (#6719) `asyncio.CancelledError()` on peer disconnection have been removed by #4080, but #4415 re-introduced it silently. `self._waiter.cancel()` and `self._task_handler.cancel()` were added by #4415, but #4415 in fact only needed `self._waiter.cancel()` (proof below). So I propose to remove `self._task_handler.cancel()`, both #4080 and #4415 will be fixed. To test that I re-resolved #4080 I used: ```py async def handle(request): try: await asyncio.sleep(5) await request.text() except BaseException as e: print(f'base exception {type(e).__name__}') return web.Response(text='toto') ``` ```console curl -X POST -H "Content-Type: text/plain" --data "bouh" localhost:8080 ``` I kill the curl request before the 5 seconds of sleep. Before this PR I have the following error right after killing the curl: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception CancelledError ``` After this commit I have the following error, but only after the 5 seconds sleep: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) base exception ConnectionResetError ``` To test that I didn't re-introduce #4415 I use a basic `handle` and 30 `curl localhost:8080`: - Before this commit no issue - If I remove `self._task_handler.cancel()` no issue - If I remove both `self._task_handler.cancel()` and `self._waiter.cancel()`: ```console $ python -Wall -X dev test.py ======== Running on http://0.0.0.0:8080 ======== (Press CTRL+C to quit) Task was destroyed but it is pending! task: <Task pending name='Task-4' coro=<RequestHandler.start() done, defined at ... Task was destroyed but it is pending! ... ``` So it's OK to remove only `self._task_handler.cancel()`. There is no documentation or tests to be updated because #4080 already did that part. However I guess that for a few people it might be seen as a breaking change, I'm not sure. Tested on master and on v3.8.1. fixes #6719 * Update 6719.bugfix Co-authored-by: Sam Bull <aa6bs0@sambull.org> (cherry picked from commit adeece3) Co-authored-by: Hoel IRIS <hoel.iris@gmail.com>
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Fixes #4408