kafka-pub-sub/ProduceEvent.js

An application which is designed based on apache kafka pub-sub.

const { Partitioners } = require('kafkajs');
const kafka = require('./config/kafka');
const validateTopic = require('./validation/validateTopic');
const validateEvent = require('./validation/validateEvent');
const validateData = require('./validation/validateData');
const validateHeaders = require('./validation/validateHeaders');

const producer = kafka.producer({
  createPartitioner: Partitioners.DefaultPartitioner,
});

/**
 * Asynchronously produces an event for a given topic with optional data.
 *
 * @param {string} topic - the topic to produce the event to.
 * @param {string} event - the name of the event being produced.
 * @param {Object} [data={}] - optional data to include with the event.
 * @param {Object} [headers={}] - optional headers to include with the message.
 * @return {Promise} a promise that resolves when the message is sent successfully.
 * @throws {string} an error message if message sending fails.
 */
const ProduceEvent = async (topic, event, data = {}, headers = {}) => {
  // basic validations
  validateTopic(topic);
  validateEvent(event);
  validateData(data);
  validateHeaders(headers);

  await producer.connect();

  return new Promise((resolve, reject) => {
    try {
      const message = [
        {
          key: `key-${event}`,
          value: JSON.stringify({ data }),
          headers,
        },
      ];

      const response = producer.send({
        topic,
        messages: message,
      });

      producer.disconnect();
      resolve(response);
    } catch (error) {
      producer.disconnect();
      reject(error.message);
    }
  });
};

module.exports = ProduceEvent;