/srv.socket.js

/**
 * srv.web.js – Handling Socket.IO Requests
 * This file is part of noduino (c) 2012 Sebastian Müller <c@semu.mp>
 *
 * @package     noduino
 * @author      Sebastian Müller <c@semu.mp>
 * @license     MIT License – http://www.opensource.org/licenses/mit-license.php 
 * @url         https://github.com/semu/noduino
 */
 
define(['socket.io', 'public/scripts/libs/Noduino', 'public/scripts/libs/Noduino.Serial', 'public/scripts/libs/Logger'], function(io, Noduino, Connector, Logger) {
  
  /**
   * Define SocketHandler
   * @param object socket Socket.IO
   */
  var SocketHandler = function(socket) {
    this.sockets  = {};
    this.arduinos = {};
    this.handler  = socket.listen(8090);
    this.handler.set('origin', '*');
    this.pinCache = {};
    
    this.bindings();
  };
  
  /**
   * Get selected Arduino
   */
  SocketHandler.prototype.current = function() {
    return this.arduinos[0];
  };
  
  /**
   * Connect Bindings
   */
  SocketHandler.prototype.bindings = function() {
    var io = this.handler, that = this;

    io.sockets.on('connection', function(socket) {
      that.sockets[socket.id] = socket;

      /**
       * Incoming Serial Request
       */
      that.sockets[socket.id].on('serial', function(data) {
        switch (data.type) {
          case 'write':
            that.current().write(data.write);
            break;
          case 'analogRead':
            var curPin = data.pin;
            that.current().watchAnalogIn({'pin': data.pin}, function(m) {
              if (!m.pin || m.pin == null || m.pin == NaN) {
                return; }
              
              if (m.state != that.pinCache[m.pin] && curPin == m.pin) {
                socket.emit('response', {'type': 'analogRead', 'pin': m.pin, 'value': m.state});
                that.pinCache[m.pin] = m.state;
              }
            });
          break;
          case 'digitalRead':
            var curPin = data.pin;
            that.current().watchDigitalIn({'pin': data.pin}, function(m) {
              if (!m.pin || m.pin == null || m.pin == NaN) {
                return; }
              
              if (m.state != that.pinCache[m.pin] && curPin == m.pin) {
                socket.emit('response', {'type': 'digitalRead', 'pin': m.pin, 'value': m.state});
                that.pinCache[m.pin] = m.state;
              }
            });
          break;
        }
      });

      /**
       * Connect to Arduino
       */      
      that.sockets[socket.id].on('board.connect', function(data) {
        if (that.current() && that.current().connected == true) {
          return socket.emit('response', {'msg': 'board.connect', 'response': 'ready'}); }
        
        that.arduinos[0] = new Noduino({'debug': true}, Connector, Logger);
        that.current().connect(function(err, board) {
          that.current().connected = false;
          if (err) { return socket.emit('response', {'msg': 'board.connect', 'response': 'failed'}); }
          
          that.current().connected = true;
          return socket.emit('response', {'msg': 'board.connect', 'response': 'ready'});
        });
      });
    });
  };

  return new SocketHandler(io, Noduino, Connector, Logger);
});