Refactor LRC fetching logic to use BackgroundTasks directly and encapsulate in a new async method

endpoints/radio.py

@@ -433,28 +433,8 @@ class Radio(FastAPI):
         next["start"] = time_started
         next["end"] = time_ends
 
-        # Use BackgroundTasks with a sync wrapper for LRC fetch/cache
-        def lrc_fetch_sync(station, track_json):
-            import asyncio
-            try:
-                async def lrc_fetch():
-                    async with self.lrc_cache_locks[station]:
-                        self.lrc_cache.pop(station, None)
-                        lrc, source = await self._fetch_and_cache_lrc(station, track_json)
-                        if lrc:
-                            self.lrc_cache[station] = lrc
-                        else:
-                            self.lrc_cache[station] = None
-                    if lrc:
-                        await self.broadcast_lrc(station, lrc, source)
-                asyncio.run(lrc_fetch())
-            except Exception as e:
-                logging.error(f"[LRC] Error during LRC fetch/cache: {e}")
-        try:
-            # Pass a copy of the track dict to avoid mutation issues
-            background_tasks.add_task(lrc_fetch_sync, data.station, next.copy())
-        except Exception as e:
-            logging.error(f"[LRC] Could not schedule LRC fetch task: {e}")
+        # Use BackgroundTasks for LRC fetch/cache
+        background_tasks.add_task(self._do_lrc_fetch, data.station, next.copy())
 
         try:
             background_tasks.add_task(self.radio_util.webhook_song_change, next, data.station)
@@ -818,3 +798,18 @@ class Radio(FastAPI):
         except Exception as e:
             logging.error(f"[LRC] Error fetching lyrics: {e}")
             return None, "None"
+
+    async def _do_lrc_fetch(self, station: str, track_json: dict):
+        """Fetch and cache LRC for a station's track."""
+        try:
+            async with self.lrc_cache_locks[station]:
+                self.lrc_cache.pop(station, None)
+                lrc, source = await self._fetch_and_cache_lrc(station, track_json)
+                if lrc:
+                    self.lrc_cache[station] = lrc
+                else:
+                    self.lrc_cache[station] = None
+            if lrc:
+                await self.broadcast_lrc(station, lrc, source)
+        except Exception as e:
+            logging.error(f"[LRC] Error during LRC fetch/cache: {e}")