@harmonyhub/discover/lib/responseCollector.ts

Discover available Logitech Harmony Hubs in the current network.

import autobind from 'autobind-decorator';

import * as logger from 'debug';
const debug = logger('harmonyhub:discover:responsecollector');

import { EventEmitter } from 'events';
import * as net from 'net';

@autobind
export class ResponseCollector extends EventEmitter {

  port: number;
  server: net.Server;

  /**
   * @param port Port number on this client to use for the tcp server.
   */
  constructor(port: number) {
    super();

    debug(`Be aware that port ${port} needs to be reachable on your machine in order to discover harmony hubs.`);
    debug(`ResponseCollector(${port})`);

    this.port = port;
  }

  /**
   * Setup a tcp server to listen for hub messages and emit a
   * response when the message is done.
   */
  start(): void {
    debug('start()');

    this.server = net.createServer((socket) => {
      debug('handle new connection');

      let buffer = '';

      socket.on('data', (data) => {
        debug('received data chunk');
        buffer += data.toString();
      });

      socket.on('end', () => {
        debug('connection closed. emitting data.');
        this.emit(ResponseCollector.Events.RESPONSE, buffer);
      });
    }).listen(this.port);
  }

  /**
   * Close the tcp server.
   */
  stop() {
    debug('stop()');

    if (this.server) {
      this.server.close();
    } else {
      debug('not running');
    }
  }
}

export namespace ResponseCollector {
  export enum Events {
    RESPONSE = 'response'
  }
}