New transport AIOHTTPWebsocketsTransport (#478)

docs/code_examples/aiohttp_websockets_async.py

@@ -0,0 +1,50 @@
+import asyncio
+import logging
+
+from gql import Client, gql
+from gql.transport.aiohttp_websockets import AIOHTTPWebsocketsTransport
+
+logging.basicConfig(level=logging.INFO)
+
+
+async def main():
+
+    transport = AIOHTTPWebsocketsTransport(
+        url="wss://countries.trevorblades.com/graphql"
+    )
+
+    # Using `async with` on the client will start a connection on the transport
+    # and provide a `session` variable to execute queries on this connection
+    async with Client(
+        transport=transport,
+    ) as session:
+
+        # Execute single query
+        query = gql(
+            """
+            query getContinents {
+              continents {
+                code
+                name
+              }
+            }
+        """
+        )
+        result = await session.execute(query)
+        print(result)
+
+        # Request subscription
+        subscription = gql(
+            """
+            subscription {
+                somethingChanged {
+                    id
+                }
+            }
+        """
+        )
+        async for result in session.subscribe(subscription):
+            print(result)
+
+
+asyncio.run(main())

docs/intro.rst

@@ -36,25 +36,27 @@ which needs the :code:`aiohttp` dependency, then you can install GQL with::
 
 The corresponding between extra dependencies required and the GQL classes is:
 
-+---------------------+----------------------------------------------------------------+
-| Extra dependencies  | Classes                                                        |
-+=====================+================================================================+
-| aiohttp             | :ref:`AIOHTTPTransport <aiohttp_transport>`                    |
-+---------------------+----------------------------------------------------------------+
-| websockets          | :ref:`WebsocketsTransport <websockets_transport>`              |
-|                     |                                                                |
-|                     | :ref:`PhoenixChannelWebsocketsTransport <phoenix_transport>`   |
-|                     |                                                                |
-|                     | :ref:`AppSyncWebsocketsTransport <appsync_transport>`          |
-+---------------------+----------------------------------------------------------------+
-| requests            | :ref:`RequestsHTTPTransport <requests_transport>`              |
-+---------------------+----------------------------------------------------------------+
-| httpx               | :ref:`HTTPTXTransport <httpx_transport>`                       |
-|                     |                                                                |
-|                     | :ref:`HTTPXAsyncTransport <httpx_async_transport>`             |
-+---------------------+----------------------------------------------------------------+
-| botocore            | :ref:`AppSyncIAMAuthentication <appsync_iam_auth>`             |
-+---------------------+----------------------------------------------------------------+
++---------------------+------------------------------------------------------------------+
+| Extra dependencies  | Classes                                                          |
++=====================+==================================================================+
+| aiohttp             | :ref:`AIOHTTPTransport <aiohttp_transport>`                      |
+|                     |                                                                  |
+|                     | :ref:`AIOHTTPWebsocketsTransport <aiohttp_websockets_transport>` |
++---------------------+------------------------------------------------------------------+
+| websockets          | :ref:`WebsocketsTransport <websockets_transport>`                |
+|                     |                                                                  |
+|                     | :ref:`PhoenixChannelWebsocketsTransport <phoenix_transport>`     |
+|                     |                                                                  |
+|                     | :ref:`AppSyncWebsocketsTransport <appsync_transport>`            |
++---------------------+------------------------------------------------------------------+
+| requests            | :ref:`RequestsHTTPTransport <requests_transport>`                |
++---------------------+------------------------------------------------------------------+
+| httpx               | :ref:`HTTPTXTransport <httpx_transport>`                         |
+|                     |                                                                  |
+|                     | :ref:`HTTPXAsyncTransport <httpx_async_transport>`               |
++---------------------+------------------------------------------------------------------+
+| botocore            | :ref:`AppSyncIAMAuthentication <appsync_iam_auth>`               |
++---------------------+------------------------------------------------------------------+
 
 .. note::
 

docs/modules/gql.rst

@@ -21,6 +21,7 @@ Sub-Packages
    client
    transport
    transport_aiohttp
+   transport_aiohttp_websockets
    transport_appsync_auth
    transport_appsync_websockets
    transport_exceptions

docs/modules/transport_aiohttp_websockets.rst

@@ -0,0 +1,7 @@
+gql.transport.aiohttp_websockets
+================================
+
+.. currentmodule:: gql.transport.aiohttp_websockets
+
+.. automodule:: gql.transport.aiohttp_websockets
+    :member-order: bysource

docs/transports/aiohttp.rst

@@ -10,7 +10,9 @@ Reference: :class:`gql.transport.aiohttp.AIOHTTPTransport`
 .. note::
 
     GraphQL subscriptions are not supported on the HTTP transport.
-    For subscriptions you should use the :ref:`websockets transport <websockets_transport>`.
+    For subscriptions you should use a websockets transport:
+    :ref:`WebsocketsTransport <websockets_transport>` or
+    :ref:`AIOHTTPWebsocketsTransport <aiohttp_websockets_transport>`.
 
 .. literalinclude:: ../code_examples/aiohttp_async.py
 

docs/transports/aiohttp_websockets.rst

@@ -0,0 +1,31 @@
+.. _aiohttp_websockets_transport:
+
+AIOHTTPWebsocketsTransport
+==========================
+
+The AIOHTTPWebsocketsTransport is an alternative to the :ref:`websockets_transport`,
+using the `aiohttp` dependency instead of the `websockets` dependency.
+
+It also supports both:
+
+ - the `Apollo websockets transport protocol`_.
+ - the `GraphQL-ws websockets transport protocol`_
+
+It will propose both subprotocols to the backend and detect the supported protocol
+from the response http headers returned by the backend.
+
+.. note::
+    For some backends (graphql-ws before `version 5.6.1`_ without backwards compatibility), it may be necessary to specify
+    only one subprotocol to the backend. It can be done by using
+    :code:`subprotocols=[AIOHTTPWebsocketsTransport.GRAPHQLWS_SUBPROTOCOL]`
+    or :code:`subprotocols=[AIOHTTPWebsocketsTransport.APOLLO_SUBPROTOCOL]` in the transport arguments.
+
+This transport allows to do multiple queries, mutations and subscriptions on the same websocket connection.
+
+Reference: :class:`gql.transport.aiohttp_websockets.AIOHTTPWebsocketsTransport`
+
+.. literalinclude:: ../code_examples/aiohttp_websockets_async.py
+
+.. _version 5.6.1: https://github.com/enisdenjo/graphql-ws/releases/tag/v5.6.1
+.. _Apollo websockets transport protocol:  https://github.com/apollographql/subscriptions-transport-ws/blob/master/PROTOCOL.md
+.. _GraphQL-ws websockets transport protocol: https://github.com/enisdenjo/graphql-ws/blob/master/PROTOCOL.md

docs/transports/async_transports.rst

@@ -12,5 +12,6 @@ Async transports are transports which are using an underlying async library. The
    aiohttp
    httpx_async
    websockets
+   aiohttp_websockets
    phoenix
    appsync

gql/cli.py

@@ -159,6 +159,7 @@ def get_parser(with_examples: bool = False) -> ArgumentParser:
             "aiohttp",
             "phoenix",
             "websockets",
+            "aiohttp_websockets",
             "appsync_http",
             "appsync_websockets",
         ],
@@ -286,7 +287,12 @@ def autodetect_transport(url: URL) -> str:
     """Detects which transport should be used depending on url."""
 
     if url.scheme in ["ws", "wss"]:
-        transport_name = "websockets"
+        try:
+            import websockets  # noqa: F401
+
+            transport_name = "websockets"
+        except ImportError:  # pragma: no cover
+            transport_name = "aiohttp_websockets"
 
     else:
         assert url.scheme in ["http", "https"]
@@ -338,6 +344,11 @@ def get_transport(args: Namespace) -> Optional[AsyncTransport]:
 
         return WebsocketsTransport(url=args.server, **transport_args)
 
+    elif transport_name == "aiohttp_websockets":
+        from gql.transport.aiohttp_websockets import AIOHTTPWebsocketsTransport
+
+        return AIOHTTPWebsocketsTransport(url=args.server, **transport_args)
+
     else:
 
         from gql.transport.appsync_auth import AppSyncAuthentication