@awesomeniko/kafka-trail/dist/kafka/kafka-consumer.js

A Node.js library for managing message queue with Kafka

import { ConsumerSubscribeError } from "../custom-errors/kafka-errors.js";
import { ifNanUseDefaultNumber } from "../libs/helpers/castings.js";
import { retry } from "../libs/helpers/retry.js";
import { KTKafkaBroker } from "./kafka-broker.js";
class KTKafkaConsumer extends KTKafkaBroker {
    #isConnected = false;
    #logger;
    consumer;
    #subscribeRetry = {
        interval: 2000,
        retries: 50,
    };
    constructor(params) {
        super(params);
        const { consumerGroupId, subscribeRetries, subscribeRetryInterval, heartbeatInterval, } = params.kafkaSettings;
        if (!consumerGroupId) {
            throw new Error("group id must be provided");
        }
        const { logger } = params;
        this.#logger = logger;
        this.#subscribeRetry.retries = ifNanUseDefaultNumber(subscribeRetries, 30);
        this.#subscribeRetry.interval = ifNanUseDefaultNumber(subscribeRetryInterval, 2000);
        const hbInterval = ifNanUseDefaultNumber(heartbeatInterval, 30);
        this.consumer = this._kafka.consumer({
            groupId: consumerGroupId,
            allowAutoTopicCreation: false,
            heartbeatInterval: hbInterval,
        });
    }
    isConnected() {
        return this.#isConnected;
    }
    async init() {
        await this.consumer.connect();
        this.#isConnected = true;
        return this.isConnected();
    }
    async destroy() {
        await this.consumer.stop();
        this.#isConnected = false;
        await this.consumer.disconnect();
    }
    async subscribeTopic(topics) {
        const isSubscribed = await retry(async () => await this.consumer.subscribe({
            topics,
            fromBeginning: true,
        }), this.#logger, {
            maxRetries: this.#subscribeRetry.retries,
            interval: this.#subscribeRetry.interval,
        });
        if (!isSubscribed) {
            throw new ConsumerSubscribeError();
        }
    }
}
export { KTKafkaConsumer };
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