feat(chat_manager.py): add empty_history method to ChatHistory class

fix(chat_manager.py): empty chat history for a client when an exception is raised
fix(GenericNode): fix useEffect dependencies to avoid unnecessary re-renders

src/backend/langflow/api/chat_manager.py

@@ -36,6 +36,10 @@ class ChatHistory(Subject):
         else:
             return []
 
+    def empty_history(self, client_id: str):
+        """Empty the chat history for a client."""
+        self.history[client_id] = []
+
 
 class ChatManager:
     def __init__(self):
@@ -119,6 +123,7 @@ class ChatManager:
         except Exception as e:
             # Log stack trace
             logger.exception(e)
+            self.chat_history.empty_history(client_id)
             raise e
         # Send a response back to the frontend, if needed
         intermediate_steps = intermediate_steps or ""

src/frontend/src/CustomNodes/GenericNode/index.tsx

@@ -29,6 +29,13 @@ export default function GenericNode({
   const [isGreenOutline, setIsGreenOutline] = useState(false);
   const [isRedOutline, setIsRedOutline] = useState(false);
   const { reactFlowInstance } = useContext(typesContext);
+  const [params, setParams] = useState([]);
+
+  useEffect(() => {
+    if (reactFlowInstance) {
+      setParams(Object.values(reactFlowInstance.toObject()));
+    }
+  }, [reactFlowInstance]);
 
   const debouncedValidateNode = useDebouncedCallback(async () => {
     // Check if the validationStatus is "success"
@@ -60,14 +67,7 @@ export default function GenericNode({
 
   useEffect(() => {
     validateNode();
-  }, [
+  }, [validateNode, params]);
-    validateNode,
-    // Use the result of ...reactFlowInstance.toObject()
-    // to determine if the node has changed
-    // turn into an array of nodes and edges
-    // and compare the length of the array
-    ...Object.values(reactFlowInstance.toObject()),
-  ]);
 
   useEffect(() => {
     if (validationStatus === "success") {