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Websocket hangs with Windows and Python 3.8 #31

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jyu00 opened this issue Jul 8, 2020 · 5 comments
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Websocket hangs with Windows and Python 3.8 #31

jyu00 opened this issue Jul 8, 2020 · 5 comments

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@jyu00
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jyu00 commented Jul 8, 2020 •
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Connection via websockets hangs when running on Windows with Python 3.8, nest_asyncio, and the default WindowsProactorEventLoopPolicy. A simple program can reproduce this:

import asyncio
import nest_asyncio
from websockets import connect

nest_asyncio.apply()

async def _connect():
    websocket = await connect('wss://wss.foo.com:9876')

def client():
    loop = asyncio.get_event_loop()
    return loop.run_until_complete(_connect())

if __name__ == "__main__":
    client()

This works on other platforms/Python versions/policy, or without nest_asyncio. I did a little bit of tracing, and it looks like the connect() completed successfully, but it somehow got stuck when selecting the next event.
@erdewit
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erdewit commented Jul 15, 2020

In the script to reproduce the issue it seems that the definition for job_status is omitted.

@jyu00
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jyu00 commented Jul 16, 2020

Yeah sorry the simplified version should not have job_status. Updated the original text.

@WestXu
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WestXu commented Aug 11, 2020

pip install nest_asyncio==1.3.3 fixes it.

erdewit added a commit that referenced this issue Oct 25, 2020
@erdewit
Issue #31: Use definite timeout for ProactorEventLoop
ffa31a3
@erdewit
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erdewit commented Oct 25, 2020

I can reproduce the issue on Windows 10, Python 3.9. The issue is the ProactorEvenLloop getting a timeout of None in a select call, which then leaves it hanging. A work-around has been added to use a definite timeout value instead of None.

@erdewit
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erdewit commented Oct 25, 2020

This is released now in v1.4.2.

@erdewit erdewit closed this as completed Oct 25, 2020
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3 participants
@erdewit @WestXu @jyu00