refactor(validate.py): extract build_graph function to langflow.inter…

src/backend/langflow/api/validate.py

@@ -7,6 +7,7 @@
     PromptValidationResponse,
     validate_prompt,
 )
+from langflow.interface.run import build_graph
 from langflow.utils.logger import logger
 from langflow.utils.validate import validate_code
 
@@ -33,3 +34,20 @@ def post_validate_prompt(prompt: Prompt):
     except Exception as e:
         logger.exception(e)
         raise HTTPException(status_code=500, detail=str(e)) from e
+
+
+# validate node
+@router.post("/node/{node_id}", status_code=200)
+def post_validate_node(node_id: str, data: dict):
+    try:
+        # build graph
+        graph = build_graph(data)
+        # validate node
+        node = graph.get_node(node_id)
+        if node is not None:
+            _ = node.build()
+            return str(node.params)
+        raise Exception(f"Node {node_id} not found")
+    except Exception as e:
+        logger.exception(e)
+        raise HTTPException(status_code=500, detail=str(e)) from e

src/backend/langflow/interface/run.py

@@ -39,14 +39,14 @@ def build_langchain_object_with_caching(data_graph):
     """
 
     logger.debug("Building langchain object")
+    graph = build_graph(data_graph)
+    return graph.build()
+
+
+def build_graph(data_graph):
     nodes = data_graph["nodes"]
-    # Add input variables
-    # nodes = payload.extract_input_variables(nodes)
-    # Nodes, edges and root node
     edges = data_graph["edges"]
-    graph = Graph(nodes, edges)
-
-    return graph.build()
+    return Graph(nodes, edges)
 
 
 def build_langchain_object(data_graph):

src/frontend/package.json

@@ -35,6 +35,7 @@
         "reactflow": "^11.5.5",
         "tailwindcss": "^3.2.6",
         "typescript": "^4.9.5",
+        "use-debounce": "^9.0.4",
         "web-vitals": "^2.1.4"
     },
     "scripts": {