Improve performance of websocket_api dispatch (#88496)

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

homeassistant/components/websocket_api/connection.py

@@ -46,6 +46,7 @@ class ActiveConnection:
         self.subscriptions: dict[Hashable, Callable[[], Any]] = {}
         self.last_id = 0
         self.supported_features: dict[str, float] = {}
+        self.handlers = self.hass.data[const.DOMAIN]
         current_connection.set(self)
 
     def get_description(self, request: web.Request | None) -> str:
@@ -72,12 +73,17 @@ class ActiveConnection:
     @callback
     def async_handle(self, msg: dict[str, Any]) -> None:
         """Handle a single incoming message."""
-        handlers = self.hass.data[const.DOMAIN]
+        if (
-
+            # Not using isinstance as we don't care about children
-        try:
+            # as these are always coming from JSON
-            msg = messages.MINIMAL_MESSAGE_SCHEMA(msg)
+            type(msg) is not dict  # pylint: disable=unidiomatic-typecheck
-            cur_id = msg["id"]
+            or (
-        except vol.Invalid:
+                not (cur_id := msg.get("id"))
+                or type(cur_id) is not int  # pylint: disable=unidiomatic-typecheck
+                or not (type_ := msg.get("type"))
+                or type(type_) is not str  # pylint: disable=unidiomatic-typecheck
+            )
+        ):
             self.logger.error("Received invalid command", msg)
             self.send_message(
                 messages.error_message(
@@ -96,8 +102,8 @@ class ActiveConnection:
             )
             return
 
-        if msg["type"] not in handlers:
+        if not (handler_schema := self.handlers.get(type_)):
-            self.logger.info("Received unknown command: {}".format(msg["type"]))
+            self.logger.info(f"Received unknown command: {type_}")
             self.send_message(
                 messages.error_message(
                     cur_id, const.ERR_UNKNOWN_COMMAND, "Unknown command."
@@ -105,7 +111,7 @@ class ActiveConnection:
             )
             return
 
-        handler, schema = handlers[msg["type"]]
+        handler, schema = handler_schema
 
         try:
             handler(self.hass, self, schema(msg))

tests/components/websocket_api/test_connection.py

@@ -10,6 +10,8 @@ import voluptuous as vol
 
 from homeassistant import exceptions
 from homeassistant.components import websocket_api
+from homeassistant.components.websocket_api.const import DOMAIN
+from homeassistant.core import HomeAssistant
 
 from tests.common import MockUser
 
@@ -56,6 +58,7 @@ from tests.common import MockUser
     ],
 )
 async def test_exception_handling(
+    hass: HomeAssistant,
     caplog: pytest.LogCaptureFixture,
     exc: Exception,
     code: str,
@@ -67,6 +70,7 @@ async def test_exception_handling(
     user = MockUser()
     refresh_token = Mock()
     current_request = AsyncMock()
+    hass.data[DOMAIN] = {}
 
     def get_extra_info(key: str) -> Any:
         if key == "sslcontext":
@@ -89,7 +93,7 @@ async def test_exception_handling(
     ) as current_request:
         current_request.get.return_value = mocked_request
         conn = websocket_api.ActiveConnection(
-            logging.getLogger(__name__), None, send_messages.append, user, refresh_token
+            logging.getLogger(__name__), hass, send_messages.append, user, refresh_token
         )
 
         conn.async_handle_exception({"id": 5}, exc)

tests/components/websocket_api/test_http.py

@@ -17,7 +17,7 @@ from tests.typing import WebSocketGenerator
 @pytest.fixture
 def mock_low_queue():
     """Mock a low queue."""
-    with patch("homeassistant.components.websocket_api.http.MAX_PENDING_MSG", 5):
+    with patch("homeassistant.components.websocket_api.http.MAX_PENDING_MSG", 1):
         yield