feat: interceptor

src/common/interceptors/wrap-response/wrap-response.interceptor.spec.ts

@@ -0,0 +1,7 @@
+import { WrapResponseInterceptor } from './wrap-response.interceptor';
+
+describe('WrapResponseInterceptor', () => {
+  it('should be defined', () => {
+    expect(new WrapResponseInterceptor()).toBeDefined();
+  });
+});

src/common/interceptors/wrap-response/wrap-response.interceptor.ts

@@ -0,0 +1,20 @@
+// nest g interceptor common/interceptors/wrap-response
+
+import {
+  CallHandler,
+  ExecutionContext,
+  Injectable,
+  NestInterceptor,
+} from '@nestjs/common';
+// import { Observable, tap } from 'rxjs';
+import { Observable, map } from 'rxjs';
+
+@Injectable()
+export class WrapResponseInterceptor implements NestInterceptor {
+  intercept(context: ExecutionContext, next: CallHandler): Observable<any> {
+    console.log('Before...');
+    // return next.handle().pipe(tap((data) => console.log('After...', data)));
+    // 将返回的数据放到 {data: xxx} 中
+    return next.handle().pipe(map((data) => ({ data })));
+  }
+}

src/main.ts

@@ -2,6 +2,7 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 import { ValidationPipe } from '@nestjs/common';
 import { HttpExceptionFilter } from './common/filters/http-exception/http-exception.filter';
+import { WrapResponseInterceptor } from './common/interceptors/wrap-response/wrap-response.interceptor';
 
 async function bootstrap() {
   const app = await NestFactory.create(AppModule);
@@ -18,6 +19,7 @@ async function bootstrap() {
     }),
   ); // 全局管道
   app.useGlobalFilters(new HttpExceptionFilter()); // 全局过滤器
+  app.useGlobalInterceptors(new WrapResponseInterceptor()); // 全局拦截器
   await app.listen(3000);
 }
 bootstrap();