v4.0.0b0

Breaking Changes

• Change transports prototype using GraphQLRequest (#551)
• Using GraphQLRequest instead of DocumentNode for gql, execute, subscribe methods (#556):
  This is a big change:
  • the gql and dsl_gql methods will now return a GraphQLRequest instead of a Document Node
    a GraphQLRequest is an object containing the document and optional variable_values and operation_name
  • ALL the execute and subscribe methods now receive a GraphQLRequest as main argument instead of
    a DocumentNode, variable_values and operation_name arguments
  • The old method of sending variable_values as an argument of execute or subscribe still works but is deprecated
    See https://gql.readthedocs.io/en/latest/usage/variables.html for the new syntax.
• Fix subscription task cancel exception swallow (#548):
  Previously if a task was cancelled while a subscription task was active,
  the asyncio.CancelledError Exception would be swallowed by our code.
  This is not the case anymore so you should now trap that Exception yourself.
• Clean up the file upload interface with FileVar class (#549):
  The file upload functionality has been modified to require FileVar instances
  for uploaded files (the old method still works but is deprecated).
  See https://gql.readthedocs.io/en/latest/usage/file_upload.html
• Set logging level to DEBUG for all transports (#552)
• introspection now requests deprecated input fields by default (#553)
• Trapping dependencies Exceptions into TransportConnectionFailed (#558):
  Now gql will trap Exceptions raised by dependencies when executing a request and will
  encapsulate that Exception into the TransportConnectionFailed Exception

Features

Batching requests is now fully supported, on sync or async transports, with automatic batching:

• Implementation of execute_batch for async transports (#550)
• Implementation of automatic batching for async (#554)

See https://gql.readthedocs.io/en/latest/advanced/batching_requests.html

Misc

• Remove MIT license classifier (#555)
• Refactor transports (#557)