add online clients event

src/socket/socket.service.ts

@@ -10,6 +10,7 @@ import { SocketConnection } from './socket.entity';
 @Injectable()
 export class SocketService {
   private readonly logger = new Logger(SocketService.name);
+  private readonly onlineClients = new Map<string, string>();
 
   constructor(
     @InjectRepository(SocketConnection)
@@ -75,4 +76,16 @@ export class SocketService {
       message: 'Success in sending to all clients!',
     };
   }
+
+  setOnlineClient(clientId: string, socketId: string) {
+    this.onlineClients.set(clientId, socketId);
+  }
+
+  removeOnlineClient(clientId: string) {
+    this.onlineClients.delete(clientId);
+  }
+
+  getOnlineClients(): string[] {
+    return [...this.onlineClients.keys()];
+  }
 }