feat(graph_engine): Support pausing workflow graph executions (#26585)

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

api/core/workflow/nodes/base/node.py

@@ -6,7 +6,7 @@ from typing import Any, ClassVar
 from uuid import uuid4
 
 from core.app.entities.app_invoke_entities import InvokeFrom
-from core.workflow.entities import AgentNodeStrategyInit, GraphInitParams, GraphRuntimeState
+from core.workflow.entities import AgentNodeStrategyInit, GraphInitParams
 from core.workflow.enums import ErrorStrategy, NodeExecutionType, NodeState, NodeType, WorkflowNodeExecutionStatus
 from core.workflow.graph_events import (
     GraphNodeEventBase,
@@ -20,6 +20,7 @@ from core.workflow.graph_events import (
     NodeRunLoopNextEvent,
     NodeRunLoopStartedEvent,
     NodeRunLoopSucceededEvent,
+    NodeRunPauseRequestedEvent,
     NodeRunRetrieverResourceEvent,
     NodeRunStartedEvent,
     NodeRunStreamChunkEvent,
@@ -37,10 +38,12 @@ from core.workflow.node_events import (
     LoopSucceededEvent,
     NodeEventBase,
     NodeRunResult,
+    PauseRequestedEvent,
     RunRetrieverResourceEvent,
     StreamChunkEvent,
     StreamCompletedEvent,
 )
+from core.workflow.runtime import GraphRuntimeState
 from libs.datetime_utils import naive_utc_now
 from models.enums import UserFrom
 
@@ -385,6 +388,16 @@ class Node:
                     f"Node {self._node_id} does not support status {event.node_run_result.status}"
                 )
 
+    @_dispatch.register
+    def _(self, event: PauseRequestedEvent) -> NodeRunPauseRequestedEvent:
+        return NodeRunPauseRequestedEvent(
+            id=self._node_execution_id,
+            node_id=self._node_id,
+            node_type=self.node_type,
+            node_run_result=NodeRunResult(status=WorkflowNodeExecutionStatus.PAUSED),
+            reason=event.reason,
+        )
+
     @_dispatch.register
     def _(self, event: AgentLogEvent) -> NodeRunAgentLogEvent:
         return NodeRunAgentLogEvent(