feat(microservices): add support for topic exchange (rabbitmq)

integration/microservices/e2e/topic-exchange-rmq.spec.ts

@@ -0,0 +1,38 @@
+import { INestApplication } from '@nestjs/common';
+import { MicroserviceOptions, Transport } from '@nestjs/microservices';
+import { Test } from '@nestjs/testing';
+import * as request from 'supertest';
+import { RMQTopicExchangeController } from '../src/rmq/topic-exchange-rmq.controller';
+
+describe('RabbitMQ transport (Topic Exchange)', () => {
+  let server: any;
+  let app: INestApplication;
+
+  beforeEach(async () => {
+    const module = await Test.createTestingModule({
+      controllers: [RMQTopicExchangeController],
+    }).compile();
+
+    app = module.createNestApplication();
+    server = app.getHttpAdapter().getInstance();
+
+    app.connectMicroservice<MicroserviceOptions>({
+      transport: Transport.RMQ,
+      options: {
+        urls: [`amqp://0.0.0.0:5672`],
+        queue: 'test',
+        topicExchange: 'test',
+      },
+    });
+    await app.startAllMicroservices();
+    await app.init();
+  });
+
+  it(`should send message to wildcard topic exchange`, () => {
+    return request(server).get('/topic-exchange').expect(200, 'wildcard.a.b');
+  });
+
+  afterEach(async () => {
+    await app.close();
+  });
+});

integration/microservices/src/rmq/topic-exchange-rmq.controller.ts

@@ -0,0 +1,36 @@
+import { Controller, Get } from '@nestjs/common';
+import {
+  ClientProxy,
+  ClientProxyFactory,
+  Ctx,
+  MessagePattern,
+  RmqContext,
+  Transport,
+} from '@nestjs/microservices';
+import { lastValueFrom } from 'rxjs';
+
+@Controller()
+export class RMQTopicExchangeController {
+  client: ClientProxy;
+
+  constructor() {
+    this.client = ClientProxyFactory.create({
+      transport: Transport.RMQ,
+      options: {
+        urls: [`amqp://localhost:5672`],
+        queue: 'test',
+        topicExchange: 'test',
+      },
+    });
+  }
+
+  @Get('topic-exchange')
+  async topicExchange() {
+    return lastValueFrom(this.client.send<string>('wildcard.a.b', 1));
+  }
+
+  @MessagePattern('wildcard.*.*')
+  handleTopicExchange(@Ctx() ctx: RmqContext): string {
+    return ctx.getPattern();
+  }
+}