• GraphQL parsing and message serialization now perform concurrently by sync_to_async(...,thread_sensitive=False).

WARNING: Release contains backward incompatible changes!

• To suppress/drop subscription notification just return None from the subscription resolver. Previously it was necessary to return special SKIP object which is no longer the case..
• Python 3.8 compatibility brought back. Tests pass OK.

• GraphqlWsConsumer.warn_resolver_timeout removed to avoid mess with user specified middlewares. This functionality can easily be implemented on the library user level by creating a designated middleware.
• GraphqlWsConsumer.middleware accepts an instance of graphql.MiddlewareManager or the list of functions. Same as the argument middleware of graphql.execute method.
• Fixed broken example.

• Invoke synchronous resolvers in the main thread with eventloop. So there is no difference in this aspect with async resolvers. This corresponds to the behavior of the graphql-core library.
• Added example of middleware which offloads synchronous resolvers to the threadpool.
• Fixed bug with GraphQL WrappingTypes like GraphQLNonNull causing exceptions when used as subscription field.
• Fixed broken example.

Broken support of previous Python version brought back.

• DjangoChannelsGraphqlWs has migrated to the recent versions of Django, Channels, and Graphene. All other Python dependencies updated.
• Server outputs a warning to the log when operation/resolver takes longer than specified timeout, which is one second by default. The settings GraphqlWsConsumer.warn_operation_timeout and GraphqlWsConsumer.warn_resolver_timeout allow to tune the timeout or even disable the warning at all.
• If exception raises from the resolver a response now contains a field "extensions.code" with a class name of the exception.
• Added support for async resolvers and middlewares.
• WARNING: This release is not backward compatible with previous ones! The main cause is a major update of Django, Channels, and Graphene, but there are some introduced by the library itself. In particular, context lifetime and content have changed. See README.md for details.

• Minor fix in logging.

• Added ability to configure server notification queue limit per subscribtion.

• Switched to Channels 3.
• Python dependencies updated.