rabbitmq NestJs/ClientProxy：手动侦听事件而不使用装饰器

mu0hgdu0 于 2023-06-23 发布在 RabbitMQ

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有没有一种手动的方法来订阅一个事件消息模式，而不需要在函数上使用装饰器？在服务中，我向不同的微服务发送消息。这个调用什么也不返回，只是void，但是异步触发了一个事件，我想在服务中立即监听这个事件
举个例子，也许会这样工作

// An event will be triggered later, after first value
await lastValueFrom(
  this.rabbitmqClient.send(RmqPatterns.DO_STUFF, payload),
);
    
// Now listening for that async event
this.rabbitmqClient.listen(RmqPatterns.DID_STUFF, async msg => {
  console.log(`Received message: ${msg.content.toString()}`);
});

rabbitmq

来源：https://stackoverflow.com/questions/74909926/nestjs-clientproxy-manual-listen-to-events-without-decorators

1条答案

按热度按时间

nkoocmlb1#

你需要像这样创建客户端：（此代码未经测试，可能包含错别字等）

@Injectable()
export class MqttCoreService implements OnModuleInit {
  protected mqttClient: MqttClient;

  constructor(
    @Inject('MQTT_SERVICE_CORE') protected mqttCoreClient: ClientMqtt,
  ) {}

  async onModuleInit() {
    this.mqttClient = this.mqttCoreClient.createClient();

    // Get topics from some db and subscribe
    const topics = await this.someService.getTopics();
    topics.map(topic => {
      this.subscribe(topic);
    });

    this.mqttClient.on('message', handleMessage);
  }

  subscribe(topic: string) {
    return this.mqttClient.subscribe(topic);
  }

  async handleMessage(context: MqttContext, data: MqttCoreDtoModel | number) {...}
}

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rabbitmq NestJs/ClientProxy：手动侦听事件而不使用装饰器

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