jarvisnode/modules/udp/handler.js

A library written in Node.js used to communicate with my Jarvis project

var types = require('../types');
var udp = require('./utils');
var util = require('util');
var EventEmitter = require('events').EventEmitter;
var debug = require('debug')('jarvisnode:udp');

function Handler() {

  var self = this;

  self.dgram = require('dgram').createSocket('udp4');
  self.dgram.on('message', function(data, remote) {

    self._compute(data, remote);
  });
};

util.inherits(Handler, EventEmitter);

Handler.prototype.start = function() {

  var self = this;
  var  config = require('../config').get();

  self.dgram.bind(config.ports.UDP_PORT, '0.0.0.0', function() {

    self.dgram.setBroadcast(true);
    self.dgram.addMembership(config.MULT_IP, require('ip').address());

    self.emit('start');
  });
};

Handler.prototype.requestAddress = function() {

  var self = this;

  udp.findAddress(function(cache, buf) {

    if (cache)
      return self.emit('jarvis-address');

    self.dgram.send(buf, 0, buf.length, require('../config').get().ports.J_UDP_PORT, '255.255.255.255');
  });
};

Handler.prototype.throwEvent = function(code, message) {

  var self = this;

  udp.event(code, message, function(err, buf) {

    self.dgram.send(buf, 0, buf.length,
      require('../config').get().ports.J_UDP_PORT,
      require('../config').get().J_IP);
  });
};

Handler.prototype._compute = function(data, remote) {

    var self = this;
    var config = require('../config').get();

    switch(data[0]) {

      case types.messages.UDP.J.ONLINE:
        self.requestAddress();
        self.emit('jarvis-online');
        break;

      case types.messages.UDP.J.OFFLINE:
        self.stopHeartbeat();
        self.emit('jarvis-offline');
        break;

      case types.messages.UDP.J.ADDRESS:
        config.J_IP = data.slice(1).toString();
        require('../config').save(function() {
          self.emit('jarvis-address');
        });
        break;
    }
};

module.exports = Handler;