[feature] song list websocket service fixed.

webserver/src/main/kotlin/space/mori/chzzk_bot/webserver/routes/WSSongRoutes.kt

@@ -37,6 +37,7 @@ fun Routing.wsSongRoutes() {
     fun addSession(uid: String, session: WebSocketServerSession) {
         sessions.computeIfAbsent(uid) { ConcurrentLinkedQueue() }.add(session)
     }
+
     fun removeSession(uid: String, session: WebSocketServerSession) {
         sessions[uid]?.remove(session)
         if (sessions[uid]?.isEmpty() == true) {
@@ -88,22 +89,42 @@ fun Routing.wsSongRoutes() {
     }
 
     webSocket("/song/{uid}") {
+        logger.info("WebSocket connection attempt received")
         val uid = call.parameters["uid"]
         val user = uid?.let { UserService.getUser(it) }
         if (uid == null || user == null) {
+            logger.warn("Invalid UID: $uid")
             close(CloseReason(CloseReason.Codes.CANNOT_ACCEPT, "Invalid UID"))
             return@webSocket
         }
+        try {
             addSession(uid, this)
+            logger.info("WebSocket connection established for user: $uid")
+
+            // Start heartbeat
+            val heartbeatJob = songScope.launch {
+                while (true) {
+                    try {
+                        send(Frame.Ping(ByteArray(0)))
+                        delay(30000) // 30 seconds
+                    } catch (e: Exception) {
+                        logger.error("Heartbeat failed for user $uid", e)
+                        break
+                    }
+                }
+            }
+
             if (status[uid] == SongType.STREAM_OFF) {
                 songScope.launch {
-                sendSerialized(SongResponse(
+                    sendSerialized(
+                        SongResponse(
                             SongType.STREAM_OFF.value,
                             uid,
                             null,
                             null,
                             null,
-                ))
+                        )
+                    )
                 }
             }
             try {
@@ -121,45 +142,58 @@ fun Routing.wsSongRoutes() {
                                 }
                             }
                         }
+
                         is Frame.Ping -> send(Frame.Pong(frame.data))
                         else -> {}
                     }
                 }
             } catch (e: ClosedReceiveChannelException) {
-            logger.error("Error in WebSocket: ${e.message}")
+                logger.error("WebSocket connection closed for user $uid: ${e.message}")
+            } catch (e: Exception) {
+                logger.error("Unexpected error in WebSocket for user $uid", e)
             } finally {
+                logger.info("Cleaning up WebSocket connection for user $uid")
                 removeSession(uid, this)
                 ackMap[uid]?.remove(this)
+                heartbeatJob.cancel()
+            }
+        } catch(e: Exception) {
+            logger.error("Unexpected error in WebSocket for user $uid", e)
         }
     }
 
     dispatcher.subscribe(SongEvent::class) {
         logger.debug("SongEvent: {} / {} {}", it.uid, it.type, it.current?.name)
         songScope.launch {
-            broadcastMessage(it.uid, SongResponse(
+            broadcastMessage(
+                it.uid, SongResponse(
                     it.type.value,
                     it.uid,
                     it.reqUid,
                     it.current?.toSerializable(),
                     it.next?.toSerializable(),
                     it.delUrl
-            ))
+                )
+            )
         }
     }
     dispatcher.subscribe(TimerEvent::class) {
         if (it.type == TimerType.STREAM_OFF) {
             songScope.launch {
-                broadcastMessage(it.uid, SongResponse(
+                broadcastMessage(
+                    it.uid, SongResponse(
                         it.type.value,
                         it.uid,
                         null,
                         null,
                         null,
-                ))
+                    )
+                )
             }
         }
     }
 }
+
 @Serializable
 data class SerializableYoutubeVideo(
     val url: String,