fix: Add session_id and graph parameters to flow execution functions and update graph init in Flow as Tool (#4558)

* Add session_id and graph parameters to flow function and update graph initialization logic

* Enhance `FlowTool` with user and session context in graph creation

* Add session_id and graph parameters to flow execution functions

src/backend/base/langflow/base/tools/flow_tool.py

@@ -23,6 +23,7 @@ class FlowTool(BaseTool):
     graph: Graph | None = None
     flow_id: str | None = None
     user_id: str | None = None
+    session_id: str | None = None
     inputs: list[Vertex] = []
     get_final_results_only: bool = True
 
@@ -59,9 +60,11 @@ class FlowTool(BaseTool):
 
         run_outputs = run_until_complete(
             run_flow(
+                graph=self.graph,
                 tweaks={key: {"input_value": value} for key, value in tweaks.items()},
                 flow_id=self.flow_id,
                 user_id=self.user_id,
+                session_id=self.session_id,
             )
         )
         if not run_outputs:
@@ -113,6 +116,8 @@ class FlowTool(BaseTool):
             flow_id=self.flow_id,
             user_id=self.user_id,
             run_id=run_id,
+            session_id=self.session_id,
+            graph=self.graph,
         )
         if not run_outputs:
             return "No output"

src/backend/base/langflow/components/logic/flow_tool.py

@@ -75,7 +75,7 @@ class FlowToolComponent(LCToolComponent):
     ]
 
     def build_tool(self) -> Tool:
-        FlowTool.update_forward_refs()
+        FlowTool.model_rebuild()
         if "flow_name" not in self._attributes or not self._attributes["flow_name"]:
             msg = "Flow name is required"
             raise ValueError(msg)
@@ -84,7 +84,10 @@ class FlowToolComponent(LCToolComponent):
         if not flow_data:
             msg = "Flow not found."
             raise ValueError(msg)
-        graph = Graph.from_payload(flow_data.data["data"])
+        graph = Graph.from_payload(
+            flow_data.data["data"],
+            user_id=str(self.user_id),
+        )
         try:
             graph.set_run_id(self.graph.run_id)
         except Exception:  # noqa: BLE001
@@ -98,6 +101,7 @@ class FlowToolComponent(LCToolComponent):
             inputs=inputs,
             flow_id=str(flow_data.id),
             user_id=str(self.user_id),
+            session_id=self.graph.session_id if hasattr(self, "graph") else None,
         )
         description_repr = repr(tool.description).strip("'")
         args_str = "\n".join([f"- {arg_name}: {arg_data['description']}" for arg_name, arg_data in tool.args.items()])

src/backend/base/langflow/helpers/flow.py

@@ -82,13 +82,20 @@ async def run_flow(
     output_type: str | None = "chat",
     user_id: str | None = None,
     run_id: str | None = None,
+    session_id: str | None = None,
+    graph: Graph | None = None,
 ) -> list[RunOutputs]:
     if user_id is None:
         msg = "Session is invalid"
         raise ValueError(msg)
-    graph = await load_flow(user_id, flow_id, flow_name, tweaks)
+    if graph is None:
+        graph = await load_flow(user_id, flow_id, flow_name, tweaks)
     if run_id:
         graph.set_run_id(UUID(run_id))
+    if session_id:
+        graph.session_id = session_id
+    if user_id:
+        graph.user_id = user_id
 
     if inputs is None:
         inputs = []