How to pause Nest.js Kafka consumer

Question

I am using Kafka.js in a Nest.js project. This is how I initialise KafkaClient:


@Module({
...
providers: [{
      provide: 'KAFKA_CLIENT',
      useFactory: async (configService: KafkaClientConfigService) => {

        const kafkaOptions = configService.getKafkaOptions();
        return ClientProxyFactory.create(kafkaOptions);
      },
      inject: [KafkaClientConfigService],
    },
  ]
...
})

Now I inject KafkaClient to my Controller, and I wish to consume messages with intervals. While there is a way to do it with Kafka.js using consumer.pause() I could not find any reference to such option in KafkaClient.

Is there any option to do so either by pausing or by throttling the consumer?

Can you please add your subscriber code here? – pravindot17 Jun 04 '20 at 08:41 — pravindot17, Jun 04 '20 at 08:41
Have you tried asking on their Github as an issue? – Ashniu123 Sep 07 '20 at 06:16 — Ashniu123, Sep 07 '20 at 06:16

score 0 · Answer 1 · answered Dec 14 '21 at 16:30

The ClientKafka has a protected consumer property. On the consumer itself you can call pause() and resume().

To use these methods I'm currently extending the ClientKafka with a custom class and use it as provider instead.

import { ClientKafka, KafkaOptions } from '@nestjs/microservices'

export class KafkaClient extends ClientKafka {
  pause() {
    this.consumer.pause()
    // ...
  }
}

How to pause Nest.js Kafka consumer

1 Answers1