refactor(workflow_cycle_manager): Refactors `_handle_node_execution_start`

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/core/app/apps/advanced_chat/generate_task_pipeline.py

@@ -336,12 +336,8 @@ class AdvancedChatAppGenerateTaskPipeline:
                 if not self._workflow_run_id:
                     raise ValueError("workflow run not initialized.")
 
-                with Session(db.engine, expire_on_commit=False) as session:
-                    workflow_run = self._workflow_cycle_manager._get_workflow_run(
-                        session=session, workflow_run_id=self._workflow_run_id
-                    )
                 workflow_node_execution = self._workflow_cycle_manager._handle_node_execution_start(
-                        workflow_run=workflow_run, event=event
+                    workflow_execution_id=self._workflow_run_id, event=event
                 )
 
                 node_start_resp = self._workflow_cycle_manager._workflow_node_start_to_stream_response(
@@ -349,7 +345,6 @@ class AdvancedChatAppGenerateTaskPipeline:
                     task_id=self._application_generate_entity.task_id,
                     workflow_node_execution=workflow_node_execution,
                 )
-                    session.commit()
 
                 if node_start_resp:
                     yield node_start_resp

api/core/workflow/workflow_app_generate_task_pipeline.py

@@ -298,19 +298,14 @@ class WorkflowAppGenerateTaskPipeline:
                 if not self._workflow_run_id:
                     raise ValueError("workflow run not initialized.")
 
-                with Session(db.engine, expire_on_commit=False) as session:
-                    workflow_run = self._workflow_cycle_manager._get_workflow_run(
-                        session=session, workflow_run_id=self._workflow_run_id
-                    )
                 workflow_node_execution = self._workflow_cycle_manager._handle_node_execution_start(
-                        workflow_run=workflow_run, event=event
+                    workflow_execution_id=self._workflow_run_id, event=event
                 )
                 node_start_response = self._workflow_cycle_manager._workflow_node_start_to_stream_response(
                     event=event,
                     task_id=self._application_generate_entity.task_id,
                     workflow_node_execution=workflow_node_execution,
                 )
-                    session.commit()
 
                 if node_start_response:
                     yield node_start_response

api/core/workflow/workflow_cycle_manager.py

@@ -247,7 +247,14 @@ class WorkflowCycleManager:
 
         return execution
 
-    def _handle_node_execution_start(self, *, workflow_run: WorkflowRun, event: QueueNodeStartedEvent) -> NodeExecution:
+    def _handle_node_execution_start(
+        self,
+        *,
+        workflow_execution_id: str,
+        event: QueueNodeStartedEvent,
+    ) -> NodeExecution:
+        workflow_execution = self._get_workflow_execution(workflow_execution_id)
+
         # Create a domain model
         created_at = datetime.now(UTC).replace(tzinfo=None)
         metadata = {
@@ -258,8 +265,8 @@ class WorkflowCycleManager:
 
         domain_execution = NodeExecution(
             id=str(uuid4()),
-            workflow_id=workflow_run.workflow_id,
-            workflow_run_id=workflow_run.id,
+            workflow_id=workflow_execution.workflow_id,
+            workflow_run_id=workflow_execution.id,
             predecessor_node_id=event.predecessor_node_id,
             index=event.node_run_index,
             node_execution_id=event.node_execution_id,