fix voice rooms

app/api/voice_ws.py

@@ -9,18 +9,27 @@ async def voice_ws(
     room_id: str = Query(...),
     username: str = Query(...)
 ):
+    if username in voice_hub.rooms.get(room_id, {}):
+        await ws.close(code=4001)
+        return
+
     await voice_hub.connect(room_id, username, ws)
 
-    # уведомим остальных
-    await voice_hub.broadcast(
+    users = list(voice_hub.rooms.get(room_id, {}).keys())
+    await ws.send_json({
+        "type": "users",
+        "users": users
+    })
+
+    await voice_hub.broadcast_except(
         room_id,
+        username,
         {"type": "join", "user": username}
     )
 
     try:
         while True:
             msg = await ws.receive_json()
-
             if msg["type"] == "signal":
                 await voice_hub.send_to(
                     room_id,