fix: The statistics page cannot display the tokens consumed by agent node (#21861)

api/core/workflow/nodes/tool/tool_node.py

@@ -6,6 +6,7 @@ from sqlalchemy.orm import Session
 
 from core.callback_handler.workflow_tool_callback_handler import DifyWorkflowCallbackHandler
 from core.file import File, FileTransferMethod
+from core.model_runtime.entities.llm_entities import LLMUsage
 from core.plugin.impl.exc import PluginDaemonClientSideError
 from core.plugin.impl.plugin import PluginInstaller
 from core.tools.entities.tool_entities import ToolInvokeMessage, ToolParameter
@@ -208,7 +209,7 @@ class ToolNode(BaseNode[ToolNodeData]):
 
         agent_logs: list[AgentLogEvent] = []
         agent_execution_metadata: Mapping[WorkflowNodeExecutionMetadataKey, Any] = {}
-
+        llm_usage: LLMUsage | None = None
         variables: dict[str, Any] = {}
 
         for message in message_stream:
@@ -276,9 +277,10 @@ class ToolNode(BaseNode[ToolNodeData]):
             elif message.type == ToolInvokeMessage.MessageType.JSON:
                 assert isinstance(message.message, ToolInvokeMessage.JsonMessage)
                 if self.node_type == NodeType.AGENT:
-                    msg_metadata = message.message.json_object.pop("execution_metadata", {})
+                    msg_metadata: dict[str, Any] = message.message.json_object.pop("execution_metadata", {})
+                    llm_usage = LLMUsage.from_metadata(msg_metadata)
                     agent_execution_metadata = {
-                        key: value
+                        WorkflowNodeExecutionMetadataKey(key): value
                         for key, value in msg_metadata.items()
                         if key in WorkflowNodeExecutionMetadataKey.__members__.values()
                     }
@@ -377,6 +379,7 @@ class ToolNode(BaseNode[ToolNodeData]):
                     WorkflowNodeExecutionMetadataKey.AGENT_LOG: agent_logs,
                 },
                 inputs=parameters_for_log,
+                llm_usage=llm_usage,
             )
         )