Request-level middleware

I'm using Graphene with Django, and I have a middleware that checks user auth token. I'm having an issue with the middleware being executed at the field-level. Each field resolution triggers a call to check user's token in my case.

Any suggestions to improve this? Any plans for supporting request-level middleware?

I have some idea:
1. Move auth checking into a Django middleware, but that means any exception raised will not be serialized into GraphQLResponse.
2. Add a flag `is_authenticated` into `info.context` object, if the value of `info.context.is_authenticated` is True, skip the middleware by calling `next()`