GeventSubscriptionServer ignore schema validation errors

[vodkar]

• GraphQL AioWS version: 0.3.1
• Python version: Python 3.8.5
• Operating System: Debian

Description

GeventSubscriptionServer ignore any schema validation errors.
I use Altair GraphQL client. When I send subscription request with schema text errors (for example: wrong field name), this error is covered by GeventSubscriptionServer and just raise "A subscription must return an observable"

I think problem in following lines in gevent.py, line 74:75:

assert isinstance(execution_result, Observable), \ "A subscription must return an observable"

There's check only for Observable, but in case of schema error its return ExecutionResult object with errors, then assert is failed, another error is raising

What I Did

Any subscription query with any schema error