Nestjs RabbitMq Microservices

I'm currently developing a microservice that is responsible for receiving messages from RabbitMQ. However, I am encountering an error message as follows:

ERROR [Server] There is no matching event handler defined in the remote service. Event pattern: undefined

The code snippet below shows the main.ts file:

import { NestFactory } from '@nestjs/core';
import { Transport, MicroserviceOptions } from '@nestjs/microservices';
import { AppModule } from './app.module';

async function bootstrap() {
  const app = await NestFactory.createMicroservice<MicroserviceOptions>(
    AppModule,
    {
      transport: Transport.RMQ,
      options: {
        urls: ['amqp://localhost:5672'],
        queue: 'my-queue',
        queueOptions: { durable: false },
      },
    },
  );
  app.listen();
}
bootstrap();

Here is the content of the app.module.ts file:

import { Module } from '@nestjs/common';
import { RabbitMQConsumerService } from './rabbitmq-consumer.service';

@Module({
  imports: [],
  providers: [RabbitMQConsumerService],
})
export class AppModule {}

Lastly, let's take a look at the rabbitmq-consumer.service.ts file:

import { Injectable } from '@nestjs/common';
import {
  Ctx,
  MessagePattern,
  Payload,
  RmqContext,
} from '@nestjs/microservices';

@Injectable()
export class RabbitMQConsumerService {
  @MessagePattern('my-queue')
  async processMessage(@Payload() data: any, @Ctx() context: RmqContext) {
    console.log('Received message:', data);
  }
}

Despite expecting to successfully receive messages in the NestJS service when sending them, an error occurs with the following message:

ERROR [Server] There is no matching event handler defined in the remote service. Event pattern: undefined

Answer №1

It appears that the current publisher you are using may be sending messages to the correct queue, but with an incorrect or poorly configured message pattern. As a result, the subscribing microservice is receiving the message, but there is no handler defined for that specific message pattern (or it may be undefined), which is causing the error.

If the publisher is also a nestJS microservice, it should adhere to the following syntax when using the send function:

this.client.send(pattern, payload);

In this code snippet, the client refers to an object of type ClientProxy.

For more information on this topic, please visit: https://docs.nestjs.com/microservices/basics#client

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