Ensure we prepare conversation pipeline when speech-to-text starts (#114665)

* Ensure we prepare conversation pipeline when speech-to-text starts

* Add lock around recognize

* Update homeassistant/components/conversation/default_agent.py

* Add lock around load intents

homeassistant/components/assist_pipeline/pipeline.py

@@ -865,6 +865,15 @@ class PipelineRun:
         stream: AsyncIterable[ProcessedAudioChunk],
     ) -> str:
         """Run speech-to-text portion of pipeline. Returns the spoken text."""
+        # Create a background task to prepare the conversation agent
+        if self.end_stage >= PipelineStage.INTENT:
+            self.hass.async_create_background_task(
+                conversation.async_prepare_agent(
+                    self.hass, self.intent_agent, self.language
+                ),
+                f"prepare conversation agent {self.intent_agent}",
+            )
+
         if isinstance(self.stt_provider, stt.Provider):
             engine = self.stt_provider.name
         else:
@@ -967,8 +976,6 @@ class PipelineRun:
         """Prepare recognizing an intent."""
         agent_info = conversation.async_get_agent_info(
             self.hass,
-            # If no conversation engine is set, use the Home Assistant agent
-            # (the conversation integration default is currently the last one set)
             self.pipeline.conversation_engine or conversation.HOME_ASSISTANT_AGENT,
         )
 

homeassistant/components/conversation/__init__.py

@@ -191,6 +191,18 @@ def async_get_agent_info(
     return None
 
 
+async def async_prepare_agent(
+    hass: HomeAssistant, agent_id: str | None, language: str
+) -> None:
+    """Prepare given agent."""
+    agent = async_get_agent(hass, agent_id)
+
+    if agent is None:
+        raise ValueError("Invalid agent specified")
+
+    await agent.async_prepare(language)
+
+
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Register the process service."""
     entity_component: EntityComponent[ConversationEntity] = EntityComponent(

homeassistant/components/conversation/default_agent.py

@@ -165,6 +165,7 @@ class DefaultAgent(ConversationEntity):
         self._trigger_sentences: list[TriggerData] = []
         self._trigger_intents: Intents | None = None
         self._unsub_clear_slot_list: list[Callable[[], None]] | None = None
+        self._load_intents_lock = asyncio.Lock()
 
     @property
     def supported_languages(self) -> list[str]:
@@ -636,22 +637,33 @@ class DefaultAgent(ConversationEntity):
                 else cast(LanguageIntents, lang_intents)
             )
 
-        start = time.monotonic()
+        async with self._load_intents_lock:
+            # In case it was loaded now
+            if lang_intents := self._lang_intents.get(language):
+                return (
+                    None
+                    if lang_intents is ERROR_SENTINEL
+                    else cast(LanguageIntents, lang_intents)
+                )
 
-        result = await self.hass.async_add_executor_job(self._load_intents, language)
+            start = time.monotonic()
 
-        if result is None:
-            self._lang_intents[language] = ERROR_SENTINEL
-        else:
-            self._lang_intents[language] = result
+            result = await self.hass.async_add_executor_job(
+                self._load_intents, language
+            )
 
-        _LOGGER.debug(
-            "Full intents load completed for language=%s in %.2f seconds",
-            language,
-            time.monotonic() - start,
-        )
+            if result is None:
+                self._lang_intents[language] = ERROR_SENTINEL
+            else:
+                self._lang_intents[language] = result
 
-        return result
+            _LOGGER.debug(
+                "Full intents load completed for language=%s in %.2f seconds",
+                language,
+                time.monotonic() - start,
+            )
+
+            return result
 
     def _load_intents(self, language: str) -> LanguageIntents | None:
         """Load all intents for language (run inside executor)."""

tests/components/conversation/test_init.py

@@ -213,3 +213,18 @@ async def test_get_agent_info(
 
     agent_info = conversation.async_get_agent_info(hass)
     assert agent_info == snapshot
+
+
+@pytest.mark.parametrize("agent_id", AGENT_ID_OPTIONS)
+async def test_prepare_agent(
+    hass: HomeAssistant,
+    init_components,
+    agent_id: str,
+) -> None:
+    """Test prepare agent."""
+    with patch(
+        "homeassistant.components.conversation.default_agent.DefaultAgent.async_prepare"
+    ) as mock_prepare:
+        await conversation.async_prepare_agent(hass, agent_id, "en")
+
+    assert len(mock_prepare.mock_calls) == 1