Issue with session closing about spotify.py

[mental32]

Although... with hindsight. The rationale behind the lack of an async context manager for User objects seems a little nonsensical, the following situation could be possible:

async with User.from_token(client, token) as user:
    ...
# Or alternatively
async with client.user_from_token(token) as user:
    ...

I think I'll add this and roll a new release by the end of today to address this lopsided design.

[mental32]

Every spotify.Client and http enabledspotify.User objects have an aiohttp.ClientSession open underneath them.

aiohttp will emit errors/warnings for when the sessions are inappropriately destroyed, the solution is to properly close the sessions. spotify.Client has a close method which will close the underlying client session, spotify.User objects have a http attribute that have a close method for their respective session. You must call these methods when you are discarding the objects.

The library provides an asynchronous context manager for spotify.Client so you don't have to worry about the Client at least:

async with Client(...) as client:
    await stuff

There is currently no such implementation for User objects, since they're intended to be created by other models, the client itself or via one of the User constructors such as from_code or from_token. The solution there is to call user.http.close() yourself.

I'm unable to recall the extent that spotify.sync supports the close calls, so if there are issues there let me know :)

[mental32]

PS: the close methods are coroutine functions, they must be awaited.