Error deploying ver 0.14.3 on DigitalOcean Apps Platform

[igortg]

After upgrading from ver. 0.11.2 to 0.14.3, my application container does not start on DO Apps with the following error:

Traceback (most recent call last):
  File "/usr/local/bin/hypercorn", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.8/site-packages/hypercorn/__main__.py", line 287, in main
    run(config)
  File "/usr/local/lib/python3.8/site-packages/hypercorn/run.py", line 52, in run
    shutdown_event = ctx.Event()
  File "/usr/local/lib/python3.8/multiprocessing/context.py", line 93, in Event
    return Event(ctx=self.get_context())
  File "/usr/local/lib/python3.8/multiprocessing/synchronize.py", line 324, in __init__
    self._cond = ctx.Condition(ctx.Lock())
  File "/usr/local/lib/python3.8/multiprocessing/context.py", line 68, in Lock
    return Lock(ctx=self.get_context())
  File "/usr/local/lib/python3.8/multiprocessing/synchronize.py", line 162, in __init__
    SemLock.__init__(self, SEMAPHORE, 1, 1, ctx=ctx)
  File "/usr/local/lib/python3.8/multiprocessing/synchronize.py", line 57, in __init__
    sl = self._semlock = _multiprocessing.SemLock(
OSError: [Errno 38] Function not implemented

Maybe we can't spawn on these kind of environments? I find a similar issue in AWS Lambda: https://stackoverflow.com/questions/34005930/multiprocessing-semlock-is-not-implemented-when-running-on-aws-lambda

Any information would be welcome.

[igortg]

Just checked that DO Apps Platform does not give support for multiprocessing module. So this change made Hypercorn incompatible.

[pgjones]

With 14.5 you can set workers to 0, see 662ffa952331e0e0696010624e3738dec0d855fb. I think this would then work on Digital Ocean, please let me know if it does/doesn't.