aiohttp throws RuntimeError when running with Quart and ASGI server about spotify.py

[mental32]

Thank you for reporting this, I'm currently Investigating.

As far as I can tell aiohttp is experiencing loop confusion when attempting to invoke the request.

I haven't used hypercorn but from what I've gathered its an asynchronous gunicorn? If this is the case then this can explain the loop confusion.

Also I've noticed that a potential fix could be if you simply created your spotify.Client instance inside a coroutine and that would resolve the confusion.

[sshamaiengar]

Yes, hypercorn is async gunicorn.

If this is the case then this can explain the loop confusion.

I don't know much about how event loops work so would you mind explaining this a bit more?

I am not sure how/where to create the spotify.Client inside a coroutine. Currently, it is created within my create_app factory function, which is synchronous and is what is passed to hypercorn to start a worker.

[mental32]

I don't know much about how event loops work so would you mind explaining this a bit more?

The aiohttp session when created outside of a running event loop doesn't know which one it should attach itself to, so when one does start to perform operations over the session, the session's internals will appropriately detect something funky going on and panic, this can explain the RuntimeError you were catching.

Off the top of my head a solution could be assigning the spotify client attribute on your quart server instance and set it to None. Then setup some sort of before_request handler and there you perform the check and construct the client when app.spotify is None

[sshamaiengar]

Using the before_request handler to initialize the Spotify client worked for me. Thanks for your help!