fix: 通知 SSE 长连接被 Nginx 60s 超时掐断

apps/admin/nginx.conf

@@ -25,6 +25,22 @@ server {
         add_header Cache-Control "no-cache";
     }
 
+    # SSE 长连接：禁用代理缓冲并放宽读写超时，避免 60s 空闲被掐断
+    location ~ ^/api/(notifications/stream|attendance-records/import/dingtalk/stream|ai/chat/.*/stream)$ {
+        proxy_pass http://backend:3000;
+        proxy_http_version 1.1;
+        proxy_set_header Connection "";
+        proxy_set_header Host $host;
+        proxy_set_header X-Real-IP $remote_addr;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+        proxy_set_header X-Forwarded-Proto $scheme;
+        proxy_buffering off;
+        proxy_cache off;
+        proxy_read_timeout 3600s;
+        proxy_send_timeout 3600s;
+        add_header X-Accel-Buffering no;
+    }
+
     location /api/ {
         proxy_pass http://backend:3000/api/;
         proxy_set_header Host $host;

apps/admin/src/components/NotificationBell.tsx

@@ -58,6 +58,7 @@ const NotificationBell: React.FC = () => {
     const token = useUserStore.getState().token;
     if (!token) return;
     const es = new EventSource(`/api/notifications/stream?token=${encodeURIComponent(token)}`);
+    es.onopen = () => setSseDown(false);
     es.onmessage = (event) => {
       try {
         JSON.parse(event.data);
@@ -68,7 +69,7 @@ const NotificationBell: React.FC = () => {
       }
     };
     es.onerror = () => {
-      es.close();
+      // 不主动关闭：EventSource 会自动重连，主动关闭会导致一次超时后实时通知永久断流
       setSseDown(true);
     };
     return () => {

apps/server/src/notifications/notifications.controller.ts

@@ -9,7 +9,7 @@ import {
   UseGuards,
 } from '@nestjs/common';
 import { Request } from 'express';
-import { Observable, map } from 'rxjs';
+import { Observable, interval, map, merge } from 'rxjs';
 import { NotificationsService } from './notifications.service';
 import { NotificationQueryDto } from './dto/notification.dto';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
@@ -53,17 +53,22 @@ export class NotificationsController {
     req.on('close', () => {
       this.service.unsubscribe(userId);
     });
-    return this.service.subscribe(userId).pipe(
-      map((notification) => ({
-        data: JSON.stringify({
-          id: notification.id,
-          type: notification.type,
-          title: notification.title,
-          content: notification.content,
-          link: notification.link,
-          createdAt: notification.createdAt,
-        }),
-      } as MessageEvent)),
+    // 每 25s 发送一次空消息作为心跳，避免空闲连接被 Nginx 等中间层超时掐断。
+    // 空 data 会被前端 EventSource 收到并忽略（JSON.parse 失败）。
+    return merge(
+      this.service.subscribe(userId).pipe(
+        map((notification) => ({
+          data: JSON.stringify({
+            id: notification.id,
+            type: notification.type,
+            title: notification.title,
+            content: notification.content,
+            link: notification.link,
+            createdAt: notification.createdAt,
+          }),
+        } as MessageEvent)),
+      ),
+      interval(25_000).pipe(map(() => ({ data: '' } as MessageEvent))),
     );
   }