🐛(y-webrtc) fix prob connection

Sometimes the connection was not established correctly,
because multiple connections were created at the
same time. This commit fixes this issue by ensuring
that only one connection is created at a time.

src/frontend/apps/y-webrtc-signaling/src/server.ts

@@ -68,7 +68,7 @@ const onconnection = (conn: WebSocket, url: string) => {
     subscribedTopics.forEach((topicName) => {
       const subs = topics.get(topicName) || new Set();
       subs.forEach((sub) => {
-        if (sub.conn === conn) {
+        if (sub.url === url && sub.conn === conn) {
           subs.delete(sub);
         }
       });
@@ -96,9 +96,18 @@ const onconnection = (conn: WebSocket, url: string) => {
                 topicName,
                 () => new Set(),
               );
-              topic.add({ url, conn });
-              // add topic to conn
-              subscribedTopics.add(topicName);
+
+              let isAlreadyAdded = false;
+              topic.forEach((sub) => {
+                if (sub.url === url && sub.conn === conn) {
+                  isAlreadyAdded = true;
+                }
+              });
+
+              if (!isAlreadyAdded) {
+                topic.add({ url, conn });
+                subscribedTopics.add(topicName);
+              }
             }
           });
           break;