fix: [Experimental hotfix 1] Fix Signaling issues Toju App

1. Server: WebSocket ping/pong heartbeat (index.ts)
Added a 30-second ping interval that pings all connected clients
Connections without a pong response for 45 seconds are terminated and cleaned up
Extracted removeDeadConnection() to deduplicate the cleanup logic between close events and dead connection reaping
2. Server: Fixed sendServerUsers filter bug (handler.ts:13)
Removed && cu.displayName from the filter — users who joined a server before their identify message was processed were silently invisible to everyone. This was the direct cause of "can't see each other" in session 2.
3. Client: Typing message now includes serverId
Added serverId: this.webrtc.currentServerId to the typing payload
Added a currentServerId getter on WebRTCService

server/src/websocket/handler.ts

@@ -10,7 +10,7 @@ interface WsMessage {
 /** Sends the current user list for a given server to a single connected user. */
 function sendServerUsers(user: ConnectedUser, serverId: string): void {
   const users = Array.from(connectedUsers.values())
-    .filter(cu => cu.serverIds.has(serverId) && cu.oderId !== user.oderId && cu.displayName)
+    .filter(cu => cu.serverIds.has(serverId) && cu.oderId !== user.oderId)
     .map(cu => ({ oderId: cu.oderId, displayName: cu.displayName ?? 'Anonymous' }));
 
   user.ws.send(JSON.stringify({ type: 'server_users', serverId, users }));

server/src/websocket/index.ts

@@ -9,13 +9,73 @@ import { connectedUsers } from './state';
 import { broadcastToServer } from './broadcast';
 import { handleWebSocketMessage } from './handler';
 
+/** How often to ping all connected clients (ms). */
+const PING_INTERVAL_MS = 30_000;
+/** Maximum time a client can go without a pong before we consider it dead (ms). */
+const PONG_TIMEOUT_MS = 45_000;
+
+function removeDeadConnection(connectionId: string): void {
+  const user = connectedUsers.get(connectionId);
+
+  if (user) {
+    console.log(`Removing dead connection: ${user.displayName ?? 'Unknown'} (${user.oderId})`);
+
+    user.serverIds.forEach((sid) => {
+      broadcastToServer(sid, {
+        type: 'user_left',
+        oderId: user.oderId,
+        displayName: user.displayName,
+        serverId: sid
+      }, user.oderId);
+    });
+
+    try {
+      user.ws.terminate();
+    } catch {
+      console.warn(`Failed to terminate WebSocket for ${user.displayName ?? 'Unknown'} (${user.oderId})`);
+    }
+  }
+
+  connectedUsers.delete(connectionId);
+}
+
 export function setupWebSocket(server: Server<typeof IncomingMessage, typeof ServerResponse>): void {
   const wss = new WebSocketServer({ server });
+  // Periodically ping all clients and reap dead connections
+  const pingInterval = setInterval(() => {
+    const now = Date.now();
+
+    connectedUsers.forEach((user, connectionId) => {
+      if (now - user.lastPong > PONG_TIMEOUT_MS) {
+        removeDeadConnection(connectionId);
+        return;
+      }
+
+      if (user.ws.readyState === WebSocket.OPEN) {
+        try {
+          user.ws.ping();
+        } catch {
+          console.warn(`Failed to ping client ${user.displayName ?? 'Unknown'} (${user.oderId})`);
+        }
+      }
+    });
+  }, PING_INTERVAL_MS);
+
+  wss.on('close', () => clearInterval(pingInterval));
 
   wss.on('connection', (ws: WebSocket) => {
     const connectionId = uuidv4();
+    const now = Date.now();
 
-    connectedUsers.set(connectionId, { oderId: connectionId, ws, serverIds: new Set() });
+    connectedUsers.set(connectionId, { oderId: connectionId, ws, serverIds: new Set(), lastPong: now });
+
+    ws.on('pong', () => {
+      const user = connectedUsers.get(connectionId);
+
+      if (user) {
+        user.lastPong = Date.now();
+      }
+    });
 
     ws.on('message', (data) => {
       try {
@@ -28,20 +88,7 @@ export function setupWebSocket(server: Server<typeof IncomingMessage, typeof Ser
     });
 
     ws.on('close', () => {
-      const user = connectedUsers.get(connectionId);
-
-      if (user) {
-        user.serverIds.forEach((sid) => {
-          broadcastToServer(sid, {
-            type: 'user_left',
-            oderId: user.oderId,
-            displayName: user.displayName,
-            serverId: sid
-          }, user.oderId);
-        });
-      }
-
-      connectedUsers.delete(connectionId);
+      removeDeadConnection(connectionId);
     });
 
     ws.send(JSON.stringify({ type: 'connected', connectionId, serverTime: Date.now() }));

server/src/websocket/types.ts

@@ -6,4 +6,6 @@ export interface ConnectedUser {
   serverIds: Set<string>;
   viewedServerId?: string;
   displayName?: string;
+  /** Timestamp of the last pong received (used to detect dead connections). */
+  lastPong: number;
 }