Performance: only create the OpenAIRealtimeServerEvent TypeAdapter once

Author: Michiel De Witte

src/agents/realtime/openai_realtime.py

@@ -142,6 +142,9 @@ def __init__(self) -> None:
         self._tracing_config: RealtimeModelTracingConfig | Literal["auto"] | None = None
         self._playback_tracker: RealtimePlaybackTracker | None = None
         self._created_session: OpenAISessionObject | None = None
+        self._server_event_type_adapter: TypeAdapter[OpenAIRealtimeServerEvent] = TypeAdapter(
+            OpenAIRealtimeServerEvent
+        )
 
     async def connect(self, options: RealtimeModelConfig) -> None:
         """Establish a connection to the model and keep it alive."""
@@ -462,9 +465,9 @@ async def _handle_ws_event(self, event: dict[str, Any]):
         try:
             if "previous_item_id" in event and event["previous_item_id"] is None:
                 event["previous_item_id"] = ""  # TODO (rm) remove
-            parsed: OpenAIRealtimeServerEvent = TypeAdapter(
-                OpenAIRealtimeServerEvent
-            ).validate_python(event)
+            parsed: OpenAIRealtimeServerEvent = self._server_event_type_adapter.validate_python(
+                event
+            )
         except pydantic.ValidationError as e:
             logger.error(f"Failed to validate server event: {event}", exc_info=True)
             await self._emit_event(