Cancel route scope on application stop and simplify ACK handling.

Added a monitor to cancel the route scope when the application stops, ensuring proper resource cleanup. Removed the timeout logic in the ACK handling method, simplifying the flow while maintaining error handling.

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

@@ -16,7 +16,6 @@ import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Mutex
 import kotlinx.coroutines.sync.withLock
-import kotlinx.coroutines.withTimeoutOrNull
 import kotlinx.io.IOException
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
@@ -78,26 +77,23 @@ fun Routing.wsSongListRoutes() {
     }
 
     suspend fun waitForAck(ws: WebSocketServerSession, expectedType: Int): Boolean {
-        return withTimeoutOrNull(5000L) { // 5초 타임아웃
         try {
             for (frame in ws.incoming) {
                 if (frame is Text) {
                     val message = frame.readText()
                     if (message == "ping") {
-                            return@withTimeoutOrNull true
+                        continue // Keep the loop running if a ping is received
                     }
                     val data = Json.decodeFromString<SongRequest>(message)
                     if (data.type == SongType.ACK.value) {
-                            return@withTimeoutOrNull true // ACK 받음
+                        return true // ACK received
                     }
                 }
             }
-                false // 채널이 닫힘
         } catch (e: Exception) {
             logger.warn("Error waiting for ACK: ${e.message}")
-                false
         }
-        } ?: false // 타임아웃 시 false 반환
+        return false // Return false if no ACK received
     }
 
 
@@ -124,6 +120,7 @@ fun Routing.wsSongListRoutes() {
                 // ACK 대기
                 val ackReceived = waitForAck(ws, res.type)
                 if (ackReceived) {
+                    logger.debug("ACK received for message to $uid on attempt $attempt.")
                     sentSuccessfully = true
                 } else {
                     logger.warn("ACK not received for message to $uid on attempt $attempt.")

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

@@ -1,11 +1,13 @@
 package space.mori.chzzk_bot.webserver.routes
 
+import io.ktor.server.application.ApplicationStopped
 import io.ktor.server.routing.*
 import io.ktor.server.websocket.*
 import io.ktor.websocket.*
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
 import kotlinx.coroutines.channels.ClosedReceiveChannelException
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
@@ -21,6 +23,10 @@ import java.util.concurrent.ConcurrentLinkedQueue
 val routeScope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
 
 fun Routing.wsSongRoutes() {
+    environment.monitor.subscribe(ApplicationStopped) {
+        routeScope.cancel()
+    }
+
     val sessions = ConcurrentHashMap<String, ConcurrentLinkedQueue<WebSocketServerSession>>()
     val status = ConcurrentHashMap<String, SongType>()
     val logger = LoggerFactory.getLogger("WSSongRoutes")