fix: global variable persist during api calls (#2544)

packages/service/core/chat/controller.ts

@@ -5,6 +5,7 @@ import { ChatItemValueTypeEnum, ChatRoleEnum } from '@fastgpt/global/core/chat/c
 import { delFileByFileIdList, getGFSCollection } from '../../common/file/gridfs/controller';
 import { BucketNameEnum } from '@fastgpt/global/common/file/constants';
 import { MongoChat } from './chatSchema';
+import { ChatSchema as ChatType } from '@fastgpt/global/core/chat/type.d';
 
 export async function getChatItems({
   appId,
@@ -35,7 +36,26 @@ export async function getChatItems({
 
   return { histories };
 }
-/* 临时适配旧的对话记录 */
+
+export async function getChat({
+  appId,
+  chatId,
+  field
+}: {
+  appId: string;
+  chatId?: string;
+  field: string;
+}): Promise<{ chat: ChatType | null }> {
+  if (!chatId) {
+    return { chat: null };
+  }
+
+  const chat = await MongoChat.findOne({ appId, chatId }, field).lean();
+
+  return { chat };
+}
+
+/* Temporary adaptation for old conversation records */
 export const adaptStringValue = (value: any): ChatItemValueItemType[] => {
   if (typeof value === 'string') {
     return [

projects/app/src/pages/api/v1/chat/completions.ts

@@ -20,7 +20,7 @@ import {
   textAdaptGptResponse
 } from '@fastgpt/global/core/workflow/runtime/utils';
 import { GPTMessages2Chats, chatValue2RuntimePrompt } from '@fastgpt/global/core/chat/adapt';
-import { getChatItems } from '@fastgpt/service/core/chat/controller';
+import { getChat, getChatItems } from '@fastgpt/service/core/chat/controller';
 import { saveChat } from '@fastgpt/service/core/chat/saveChat';
 import { responseWrite } from '@fastgpt/service/common/response';
 import { pushChatUsage } from '@/service/support/wallet/usage/push';
@@ -220,17 +220,31 @@ async function handler(req: NextApiRequest, res: NextApiResponse) {
 
     // Get and concat history;
     const limit = getMaxHistoryLimitFromNodes(app.modules);
-    const [{ histories }, { nodes, edges, chatConfig }] = await Promise.all([
+    const [{ histories }, { nodes, edges, chatConfig }, { chat }] = await Promise.all([
       getChatItems({
         appId: app._id,
         chatId,
         limit,
         field: `dataId obj value nodeOutputs`
       }),
-      getAppLatestVersion(app._id, app)
+      getAppLatestVersion(app._id, app),
+      getChat({
+        appId: app._id,
+        chatId,
+        field: 'source variableList variables'
+      })
     ]);
+    // get chat histories
     const newHistories = concatHistories(histories, chatMessages);
 
+    // get global variables
+    if (chat && chat.variables) {
+      variables = {
+        ...chat.variables,
+        ...variables
+      };
+    }
+
     // Get runtimeNodes
     let runtimeNodes = storeNodes2RuntimeNodes(nodes, getWorkflowEntryNodeIds(nodes, newHistories));