Log address and port, show exception trace from uvicorn.run

[nkaretnikov]

Fixes #562.

Description

This pull request:

• logs address and port on startup
• shows exception trace from uvicorn.run.

Example output when the port is already in use:

INFO  [app] Starting server on 0.0.0.0:8080
Traceback (most recent call last):
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/site-packages/uvicorn/server.py", line 160, in startup
    server = await loop.create_server(
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/base_events.py", line 1493, in create_server
    raise OSError(err.errno, 'error while attempting '
OSError: [Errno 98] error while attempting to bind on address ('0.0.0.0', 8080): address already in use

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/test/conda-store/conda-store-server/conda_store_server/server/app.py", line 371, in start
    uvicorn.run(
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/site-packages/uvicorn/main.py", line 587, in run
    server.run()
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/site-packages/uvicorn/server.py", line 61, in run
    return asyncio.run(self.serve(sockets=sockets))
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/runners.py", line 44, in run
    return loop.run_until_complete(main)
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/base_events.py", line 628, in run_until_complete
    self.run_forever()
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/base_events.py", line 595, in run_forever
    self._run_once()
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/base_events.py", line 1881, in _run_once
    handle._run()
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/site-packages/uvicorn/server.py", line 78, in serve
    await self.startup(sockets=sockets)
  File "/home/test/miniconda3/envs/conda-store-server-dev/lib/python3.10/site-packages/uvicorn/server.py", line 170, in startup
    sys.exit(1)
SystemExit: 1

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

Additional information

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[nkaretnikov]

We could move this to initialize, then we'll be able to use self.log. But it'll be far from where uvicorn is actually started.

[trallard]

ping @dcmcand for a review

[dcmcand]

I am a bit confused why self.log doesn't work in the start method while it does in the initialize method, but this seems to work and adds valuable info for people. 🚀