feat: add support for async schema in flask

[kiendang]

Supersede #66.

#66 implements async schema support for flask 1.0 by opening a hook to await for asynchronous execution results with asyncio.run. Flask 2.0 brought async/await support and provides similar hook in flask.Flask.ensure_sync which this PR uses instead. See sections extensions and other event loops in the Flask async/await doc.

[erikwrede]

What's the status on this?

[bhuijbers]

Is there any update on this issue?

[kiendang]

Is there any update on this issue?

@bhuijbers are you depending on this issue? Do you mind sharing more about your use case? I have finished implementing this PR but am hesitant to merge it coz I'm not sure this is the correct solution to support async in flask.

[bhuijbers]

@bhuijbers are you depending on this issue? Do you mind sharing more about your use case? I have finished implementing this PR but am hesitant to merge it coz I'm not sure this is the correct solution to support async in flask.

@kiendang Yes. Unfortunately I can't help you make a decision about this being a correct solution or not.

[bhuijbers]

Is there any update on this issue?

[kiendang]

@bhuijbers I'm gonna close this PR without merging. It attempted to add async support to the existing sync GraphQLView approach which I don't think is the right approach. Instead, we should create a separate AsyncGraphQLView. I've create issue #110 with some pointers in case you or anyone else wants to implement that.