hiot-kafka/lib/middleware.js

hiot-app middleware to bootstrap kafka

"use strict";
const debug = require("debug")("hiot-kafka");
const broker = require("./broker");

module.exports = (options) => {
  try {
    const logger = options.logger;
    options.connectionString = connectionString(options);

    return (locator) => {
      debug("register handlers in broker");
      options.handlers(broker, locator);

      debug(`trying to connect to ${options.connectionString}`);

      return broker.connect(options).then(() => {
        logger.info(`connected to ${options.connectionString}`);

        locator.broker = broker;
        return locator;
      });
    };
  } catch (err) {
    debug(err);
  }
};

function connectionString(options) {
  var { server, port } = options;

  if (!server.indexOf(",")) {
    return `${server}:${port}`;
  }

  return server
    .split(",")
    .map((s) => `${s}:${port}`)
    .join(",");
}