Fix recorder ws_info blocking the event loop (#110657)

* Fix recorder ws_info blocking the event loop

Fixes
```
2024-02-15 06:37:55.423 WARNING (MainThread) [asyncio] Executing <Task pending name=websocket_api.async:ws_info coro=<_handle_async_response() running at /usr/src/homeassistant/homeassistant/components/websocket_api/decorators.py:26> wait_for=<_GatheringFuture pending cb=[Task.task_wakeup()] created at /usr/local/lib/python3.12/asyncio/tasks.py:712> cb=[set.remove()] created at /usr/src/homeassistant/homeassistant/core.py:653> took 0.332 seconds
```

* no instance did not actually work

homeassistant/components/recorder/core.py

@@ -187,6 +187,7 @@ class Recorder(threading.Thread):
         self.auto_purge = auto_purge
         self.auto_repack = auto_repack
         self.keep_days = keep_days
+        self.is_running: bool = False
         self._hass_started: asyncio.Future[object] = hass.loop.create_future()
         self.commit_interval = commit_interval
         self._queue: queue.SimpleQueue[RecorderTask | Event] = queue.SimpleQueue()
@@ -694,6 +695,7 @@ class Recorder(threading.Thread):
 
     def run(self) -> None:
         """Run the recorder thread."""
+        self.is_running = True
         try:
             self._run()
         except Exception:  # pylint: disable=broad-exception-caught
@@ -703,6 +705,7 @@ class Recorder(threading.Thread):
         finally:
             # Ensure shutdown happens cleanly if
             # anything goes wrong in the run loop
+            self.is_running = False
             self._shutdown()
 
     def _add_to_session(self, session: Session, obj: object) -> None:

homeassistant/components/recorder/websocket_api.py

@@ -44,13 +44,7 @@ from .statistics import (
     statistics_during_period,
     validate_statistics,
 )
-from .util import (
-    PERIOD_SCHEMA,
-    async_migration_in_progress,
-    async_migration_is_live,
-    get_instance,
-    resolve_period,
-)
+from .util import PERIOD_SCHEMA, get_instance, resolve_period
 
 _LOGGER: logging.Logger = logging.getLogger(__package__)
 
@@ -497,21 +491,30 @@ def ws_info(
     hass: HomeAssistant, connection: websocket_api.ActiveConnection, msg: dict[str, Any]
 ) -> None:
     """Return status of the recorder."""
-    instance = get_instance(hass)
-
-    backlog = instance.backlog if instance else None
-    migration_in_progress = async_migration_in_progress(hass)
-    migration_is_live = async_migration_is_live(hass)
-    recording = instance.recording if instance else False
-    thread_alive = instance.is_alive() if instance else False
+    if instance := get_instance(hass):
+        backlog = instance.backlog
+        migration_in_progress = instance.migration_in_progress
+        migration_is_live = instance.migration_is_live
+        recording = instance.recording
+        # We avoid calling is_alive() as it can block waiting
+        # for the thread state lock which will block the event loop.
+        is_running = instance.is_running
+        max_backlog = instance.max_backlog
+    else:
+        backlog = None
+        migration_in_progress = False
+        migration_is_live = False
+        recording = False
+        is_running = False
+        max_backlog = None
 
     recorder_info = {
         "backlog": backlog,
-        "max_backlog": instance.max_backlog,
+        "max_backlog": max_backlog,
         "migration_in_progress": migration_in_progress,
         "migration_is_live": migration_is_live,
         "recording": recording,
-        "thread_running": thread_alive,
+        "thread_running": is_running,
     }
     connection.send_result(msg["id"], recorder_info)
 

tests/components/recorder/test_websocket_api.py

@@ -2132,6 +2132,23 @@ async def test_recorder_info_bad_recorder_config(
     assert response["result"]["thread_running"] is False
 
 
+async def test_recorder_info_no_instance(
+    recorder_mock: Recorder, hass: HomeAssistant, hass_ws_client: WebSocketGenerator
+) -> None:
+    """Test getting recorder when there is no instance."""
+    client = await hass_ws_client()
+
+    with patch(
+        "homeassistant.components.recorder.websocket_api.get_instance",
+        return_value=None,
+    ):
+        await client.send_json_auto_id({"type": "recorder/info"})
+        response = await client.receive_json()
+        assert response["success"]
+        assert response["result"]["recording"] is False
+        assert response["result"]["thread_running"] is False
+
+
 async def test_recorder_info_migration_queue_exhausted(
     hass: HomeAssistant, hass_ws_client: WebSocketGenerator
 ) -> None: