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Run hypercorn with multiple workers on Windows - WinError 10022

See original GitHub issue

Describe the bug Hypercorn doesn’t seem to be able to start with multiple workers on Windows. Seems like the socket is not ready to bind and Windows, therefore, throws an exception. This may be different on Unix systems.

Code snippet Starlette Hello World

main.py

from starlette.applications import Starlette
from starlette.responses import JSONResponse

app = Starlette(debug=True)


@app.route('/')
async def homepage(request):
    return JSONResponse({'hello': 'world'})

Expected behavior Hypercorn starts and is ready to serve with multiple workers.

Environment

Windows 10
Hypercorn: 0.5.3
Python 3.6.6 (same issue with Python 3.7.2)
pipenv
Starlette 0.11.4

Additional context

Command: pipenv run hypercorn main:app -w 2

Exception:

Running on 127.0.0.1:8000 over http (CTRL + C to quit)
Process Process-2:

Traceback (most recent call last):
  File "Python36_64\Lib\multiprocessing\process.py", line 258, in _bootstrap
    self.run()
	
  File "Python36_64\Lib\multiprocessing\process.py", line 93, in run
    self._target(*self._args, **self._kwargs)
	
  File ".virtualenvs\starlettehelloworld-wohnvuzv\lib\site-packages\hypercorn\asyncio\run.py", line 214, in asyncio_worker
    debug=config.debug,
	
  File ".virtualenvs\starlettehelloworld-wohnvuzv\lib\site-packages\hypercorn\asyncio\run.py", line 244, in _run
    loop.run_until_complete(main)
	
  File "Python36_64\Lib\asyncio\base_events.py", line 468, in run_until_complete
    return future.result()
	
  File ".virtualenvs\starlettehelloworld-wohnvuzv\lib\site-packages\hypercorn\asyncio\run.py", line 178, in worker_serve
    for sock in sockets
	
  File ".virtualenvs\starlettehelloworld-wohnvuzv\lib\site-packages\hypercorn\asyncio\run.py", line 178, in <listcomp>
    for sock in sockets
	
  File "Python36_64\Lib\asyncio\base_events.py", line 1065, in create_server
    sock.listen(backlog)
	
OSError: [WinError 10022] An invalid argument was supplied

Issue Analytics

State:
Created 4 years ago
Comments:8 (4 by maintainers)

Top GitHub Comments

2reactions

pgjonescommented, Apr 4, 2019

Ah, looks like #4. I’m at a loss with this bug, as I don’t understand how windows works in this regard. I’ll try investigating though.

1reaction

pgjonescommented, Aug 15, 2019

I think I’ve fixed this in 146e09556ec74eac2a37f31f831a00d3b2e7b780 in master, could you try it and confirm?

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