# Code coverage report for socket.io-client/lib/socket.js

## Statements: 33.06% (40 / 121) Branches: 4% (1 / 25) Functions: 11.11% (2 / 18) Lines: 34.19% (40 / 117) Ignored: none

All files » socket.io-client/lib/ » socket.js

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    /**
     * Module dependencies.
     */

    var parser = require('socket.io-parser');
    var Emitter = require('emitter');
    var toArray = require('to-array');
    var on = require('./on');
    var bind = require('bind');
    var debug = require('debug')('socket.io-client:socket');

    /**
     * Module exports.
     */

    module.exports = exports = Socket;

    /**
     * Internal events (blacklisted).
     * These events can't be emitted by the user.
     */

    var events = exports.events = [
      'connect',
      'disconnect',
      'error'
    ];

    /**
     * Shortcut to `Emitter#emit`.
     */

    var emit = Emitter.prototype.emit;

    /**
     * `Socket` constructor.
     *
     * @api public
     */

    function Socket(io, nsp){
      this.io = io;
      this.nsp = nsp;
      this.json = this; // compat
      this.ids = 0;
      this.acks = {};
      this.open();
      this.buffer = [];
      this.connected = false;
      this.disconnected = true;
    }

    /**
     * Mix in `Emitter`.
     */

    Emitter(Socket.prototype);

    /**
     * Called upon engine `open`.
     *
     * @api private
     */

    Socket.prototype.open =
    Socket.prototype.connect = function(){
      var io = this.io;
      io.open(); // ensure open
      Iif ('open' == this.io.readyState) this.onopen();
      this.subs = [
        on(io, 'open', bind(this, 'onopen')),
        on(io, 'error', bind(this, 'onerror'))
      ];
    };

    /**
     * Sends a `message` event.
     *
     * @return {Socket} self
     * @api public
     */

    Socket.prototype.send = function(){
      var args = toArray(arguments);
      args.unshift('message');
      this.emit.apply(this, args);
      return this;
    };

    /**
     * Override `emit`.
     * If the event is in `events`, it's emitted normally.
     *
     * @param {String} event name
     * @return {Socket} self
     * @api public
     */

    Socket.prototype.emit = function(ev){
      if (~events.indexOf(ev)) {
        emit.apply(this, arguments);
      } else {
        var args = toArray(arguments);
        var packet = { type: parser.EVENT, data: args };

        // event ack callback
        if ('function' == typeof args[args.length - 1]) {
          debug('emitting packet with ack id %d', this.ids);
          this.acks[this.ids] = args.pop();
          packet.id = this.ids++;
        }

        this.packet(packet);
      }

      return this;
    };

    /**
     * Sends a packet.
     *
     * @param {Object} packet
     * @api private
     */

    Socket.prototype.packet = function(packet){
      packet.nsp = this.nsp;
      this.io.packet(packet);
    };

    /**
     * Called upon `error`.
     *
     * @param {Object} data
     * @api private
     */

    Socket.prototype.onerror = function(data){
      this.emit('error', data);
    };

    /**
     * "Opens" the socket.
     *
     * @api private
     */

    Socket.prototype.onopen = function(){
      debug('transport is open - connecting');

      // write connect packet if necessary
      if ('/' != this.nsp) {
        this.packet({ type: parser.CONNECT });
      }

      // subscribe
      var io = this.io;
      this.subs.push(
        on(io, 'packet', bind(this, 'onpacket')),
        on(io, 'close', bind(this, 'onclose'))
      );
    };

    /**
     * Called upon engine `close`.
     *
     * @param {String} reason
     * @api private
     */

    Socket.prototype.onclose = function(reason){
      debug('close (%s)', reason);
      this.connected = false;
      this.disconnected = true;
      this.emit('disconnect', reason);
    };

    /**
     * Called with socket packet.
     *
     * @param {Object} packet
     * @api private
     */

    Socket.prototype.onpacket = function(packet){
      if (packet.nsp != this.nsp) return;

      switch (packet.type) {
        case parser.CONNECT:
          this.onconnect();
          break;

        case parser.EVENT:
          this.onevent(packet);
          break;

        case parser.ACK:
          this.onack(packet);
          break;

        case parser.DISCONNECT:
          this.ondisconnect();
          break;

        case parser.ERROR:
          this.emit('error', packet.data);
          break;
      }
    };

    /**
     * Called upon a server event.
     *
     * @param {Object} packet
     * @api private
     */

    Socket.prototype.onevent = function(packet){
      var args = packet.data || [];
      debug('emitting event %j', args);

      if (packet.id) {
        debug('attaching ack callback to event');
        args.push(this.ack(packet.id));
      }

      if (this.connected) {
        emit.apply(this, args);
      } else {
        this.buffer.push(args);
      }
    };

    /**
     * Produces an ack callback to emit with an event.
     *
     * @api private
     */

    Socket.prototype.ack = function(id){
      var self = this;
      var sent = false;
      return function(){
        // prevent double callbacks
        if (sent) return;
        var args = toArray(arguments);
        debug('sending ack %j', args);
        self.packet({
          type: parser.ACK,
          id: id,
          data: args
        });
      };
    };

    /**
     * Called upon a server acknowlegement.
     *
     * @param {Object} packet
     * @api private
     */

    Socket.prototype.onack = function(packet){
      debug('calling ack %s with %j', packet.id, packet.data);
      var fn = this.acks[packet.id];
      fn.apply(this, packet.data);
      delete this.acks[packet.id];
    };

    /**
     * Called upon server connect.
     *
     * @api private
     */

    Socket.prototype.onconnect = function(){
      this.connected = true;
      this.disconnected = false;
      this.emit('connect');
      this.emitBuffered();
    };

    /**
     * Emit buffered events.
     *
     * @api private
     */

    Socket.prototype.emitBuffered = function(){
      for (var i = 0; i < this.buffer.length; i++) {
        emit.apply(this, this.buffer[i]);
      }
      this.buffer = [];
    };

    /**
     * Called upon server disconnect.
     *
     * @api private
     */

    Socket.prototype.ondisconnect = function(){
      debug('server disconnect (%s)', this.nsp);
      this.destroy();
      this.onclose('io server disconnect');
    };

    /**
     * Cleans up.
     *
     * @api private
     */

    Socket.prototype.destroy = function(){
      debug('destroying socket (%s)', this.nsp);

      // manual close means no reconnect
      for (var i = 0; i < this.subs.length; i++) {
        this.subs[i].destroy();
      }

      // notify manager
      this.io.destroy(this);
    };

    /**
     * Disconnects the socket manually.
     *
     * @return {Socket} self
     * @api public
     */

    Socket.prototype.close =
    Socket.prototype.disconnect = function(){
      if (!this.connected) return this;

      debug('performing disconnect (%s)', this.nsp);
      this.packet({ type: parser.PACKET_DISCONNECT });

      // destroy subscriptions
      this.destroy();

      // fire events
      this.onclose('io client disconnect');
      return this;
    };