Fix: dataflow log sheet shows the previous run's log in Go mode (#17790)

web/src/pages/agent/hooks/use-run-dataflow.ts

@@ -1,5 +1,6 @@
 import message from '@/components/ui/message';
 import { useSendMessageBySSE } from '@/hooks/use-send-message';
+import i18n from '@/locales/config';
 import api from '@/utils/api';
 import { get } from 'lodash';
 import { useCallback, useState } from 'react';
@@ -25,6 +26,13 @@ export function useRunDataflow({
       const success = saveRet?.code === 0;
       if (!success) return;
 
+      // The Go backend runs the dataflow debug synchronously, so the new
+      // message_id only arrives with the run response (seconds later).
+      // Clear the previous polling key first so the log sheet renders the
+      // loading state instead of replaying the previous run's log, which is
+      // still within its Redis TTL and would otherwise look like the current
+      // result.
+      setMessageId('');
       showLogSheet();
       const res = await send({
         agent_id: id,
@@ -34,7 +42,14 @@ export function useRunDataflow({
         files: [fileResponseData.file],
       });
 
-      if (res && res?.response.status === 200 && get(res, 'data.code') === 0) {
+      if (!res) {
+        // send() swallowed a network/parse failure; without a new message_id
+        // the sheet would stay on the previous run's log, so surface it.
+        message.error(i18n.t('message.requestError'));
+        return;
+      }
+
+      if (res?.response.status === 200 && get(res, 'data.code') === 0) {
         // fetch canvas
         setUploadedFileData(fileResponseData.file[0]);
         const msgId = get(res, 'data.data.message_id');