feat: single run add opentelemetry (#31020)

api/core/workflow/workflow_entry.py

@@ -189,8 +189,7 @@ class WorkflowEntry:
             )
 
         try:
-            # run node
+            generator = cls._traced_node_run(node)
-            generator = node.run()
         except Exception as e:
             logger.exception(
                 "error while running node, workflow_id=%s, node_id=%s, node_type=%s, node_version=%s",
@@ -323,8 +322,7 @@ class WorkflowEntry:
                 tenant_id=tenant_id,
             )
 
-            # run node
+            generator = cls._traced_node_run(node)
-            generator = node.run()
 
             return node, generator
         except Exception as e:
@@ -430,3 +428,26 @@ class WorkflowEntry:
                         input_value = current_variable.value | input_value
 
                 variable_pool.add([variable_node_id] + variable_key_list, input_value)
+
+    @staticmethod
+    def _traced_node_run(node: Node) -> Generator[GraphNodeEventBase, None, None]:
+        """
+        Wraps a node's run method with OpenTelemetry tracing and returns a generator.
+        """
+        # Wrap node.run() with ObservabilityLayer hooks to produce node-level spans
+        layer = ObservabilityLayer()
+        layer.on_graph_start()
+        node.ensure_execution_id()
+
+        def _gen():
+            error: Exception | None = None
+            layer.on_node_run_start(node)
+            try:
+                yield from node.run()
+            except Exception as exc:
+                error = exc
+                raise
+            finally:
+                layer.on_node_run_end(node, error)
+
+        return _gen()