add leader session more check

api/controllers/console/app/online_user.py

@@ -99,20 +99,53 @@ def handle_disconnect(sid):
         broadcast_online_users(workflow_id)
 
 
-def get_or_set_leader(workflow_id, sid):
+def _clear_session_state(workflow_id: str, sid: str) -> None:
+    redis_client.hdel(f"workflow_online_users:{workflow_id}", sid)
+    redis_client.delete(f"ws_sid_map:{sid}")
+
+
+def _is_session_active(workflow_id: str, sid: str) -> bool:
+    if not sid:
+        return False
+
+    try:
+        if not sio.manager.is_connected(sid, "/"):
+            return False
+    except AttributeError:
+        return False
+
+    if not redis_client.hexists(f"workflow_online_users:{workflow_id}", sid):
+        return False
+
+    if not redis_client.exists(f"ws_sid_map:{sid}"):
+        return False
+
+    return True
+
+
+def get_or_set_leader(workflow_id: str, sid: str) -> str:
     """
-    Get current leader session or set this session as leader if no leader exists.
+    Get current leader session or set this session as leader if no valid leader exists.
     Returns the leader session id (sid).
     """
     leader_key = f"workflow_leader:{workflow_id}"
-    current_leader = redis_client.get(leader_key)
+    raw_leader = redis_client.get(leader_key)
+    current_leader = raw_leader.decode("utf-8") if isinstance(raw_leader, bytes) else raw_leader
+    leader_replaced = False
+
+    if current_leader and not _is_session_active(workflow_id, current_leader):
+        _clear_session_state(workflow_id, current_leader)
+        redis_client.delete(leader_key)
+        current_leader = None
+        leader_replaced = True
 
     if not current_leader:
-        # No leader exists, make this session the leader
         redis_client.set(leader_key, sid, ex=3600)  # Expire in 1 hour
+        if leader_replaced:
+            broadcast_leader_change(workflow_id, sid)
         return sid
 
-    return current_leader.decode("utf-8") if isinstance(current_leader, bytes) else current_leader
+    return current_leader
 
 
 def handle_leader_disconnect(workflow_id, disconnected_sid):