async auth and yield from

[AstraLuma]

Ok, so, I'm using httpx in swiss-army-upload. Part of this is that I (will) have multiple httpx.Auth implementations for various backend systems. With such complexity, there's some common flows I'd like to break out, eg the stuff needed to get a real OIDC JWT token when running inside of GitHub Actions.

Which is fine, you can just yield from and it's pretty easy. Cool. Hardly a trifle.

But then I needed to start doing non-HTTP things inside the auth, namely talking to credentials storage (keyring) without blocking the async loop. Cool, fine, wrap it up in async wrappers, switch from auth_flow to async_auth_flow, easy enough.

Except that you can't use yield from inside of async functions.

Here's what I can think of:

1. Manually pump the generator (.send(), StopIteration, etc)
2. Make a class that lets me manually pump it slightly less painfully (eg, a for loop and .send())
3. Strip out all the async work and do them separately up front (which looses some refresh capabilities if the object is long lived, which I expect it is)
4. Run a refresh task and poll for changes on a schedule (which will probably mostly just waste work)

Is there a better way of handling this?

[AstraLuma]

I guess I could subclass httpx.Auth that adds a .delegate() which causes it to pump that until completion. Or something. Which is really half-way to an async loop.