peerjs/dist/peer.js

/*! peerjs build:0.3.15, development. Copyright(c) 2013 Michelle Bu <michelle@michellebu.com> */(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
module.exports.RTCSessionDescription = window.RTCSessionDescription ||
	window.mozRTCSessionDescription;
module.exports.RTCPeerConnection = window.RTCPeerConnection ||
	window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
module.exports.RTCIceCandidate = window.RTCIceCandidate ||
	window.mozRTCIceCandidate;

},{}],2:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');
var Negotiator = require('./negotiator');
var Reliable = require('reliable');

/**
 * Wraps a DataChannel between two Peers.
 */
function DataConnection(peer, provider, options) {
  if (!(this instanceof DataConnection)) return new DataConnection(peer, provider, options);
  EventEmitter.call(this);

  this.options = util.extend({
    serialization: 'binary',
    reliable: false
  }, options);

  // Connection is not open yet.
  this.open = false;
  this.type = 'data';
  this.peer = peer;
  this.provider = provider;

  this.id = this.options.connectionId || DataConnection._idPrefix + util.randomToken();

  this.label = this.options.label || this.id;
  this.metadata = this.options.metadata;
  this.serialization = this.options.serialization;
  this.reliable = this.options.reliable;

  // Data channel buffering.
  this._buffer = [];
  this._buffering = false;
  this.bufferSize = 0;

  // For storing large data.
  this._chunkedData = {};

  if (this.options._payload) {
    this._peerBrowser = this.options._payload.browser;
  }

  Negotiator.startConnection(
    this,
    this.options._payload || {
      originator: true
    }
  );
}

util.inherits(DataConnection, EventEmitter);

DataConnection._idPrefix = 'dc_';

/** Called by the Negotiator when the DataChannel is ready. */
DataConnection.prototype.initialize = function(dc) {
  this._dc = this.dataChannel = dc;
  this._configureDataChannel();
}

DataConnection.prototype._configureDataChannel = function() {
  var self = this;
  if (util.supports.sctp) {
    this._dc.binaryType = 'arraybuffer';
  }
  this._dc.onopen = function() {
    util.log('Data channel connection success');
    self.open = true;
    self.emit('open');
  }

  // Use the Reliable shim for non Firefox browsers
  if (!util.supports.sctp && this.reliable) {
    this._reliable = new Reliable(this._dc, util.debug);
  }

  if (this._reliable) {
    this._reliable.onmessage = function(msg) {
      self.emit('data', msg);
    };
  } else {
    this._dc.onmessage = function(e) {
      self._handleDataMessage(e);
    };
  }
  this._dc.onclose = function(e) {
    util.log('DataChannel closed for:', self.peer);
    self.close();
  };
}

// Handles a DataChannel message.
DataConnection.prototype._handleDataMessage = function(e) {
  var self = this;
  var data = e.data;
  var datatype = data.constructor;
  if (this.serialization === 'binary' || this.serialization === 'binary-utf8') {
    if (datatype === Blob) {
      // Datatype should never be blob
      util.blobToArrayBuffer(data, function(ab) {
        data = util.unpack(ab);
        self.emit('data', data);
      });
      return;
    } else if (datatype === ArrayBuffer) {
      data = util.unpack(data);
    } else if (datatype === String) {
      // String fallback for binary data for browsers that don't support binary yet
      var ab = util.binaryStringToArrayBuffer(data);
      data = util.unpack(ab);
    }
  } else if (this.serialization === 'json') {
    data = JSON.parse(data);
  }

  // Check if we've chunked--if so, piece things back together.
  // We're guaranteed that this isn't 0.
  if (data.__peerData) {
    var id = data.__peerData;
    var chunkInfo = this._chunkedData[id] || {data: [], count: 0, total: data.total};

    chunkInfo.data[data.n] = data.data;
    chunkInfo.count += 1;

    if (chunkInfo.total === chunkInfo.count) {
      // Clean up before making the recursive call to `_handleDataMessage`.
      delete this._chunkedData[id];

      // We've received all the chunks--time to construct the complete data.
      data = new Blob(chunkInfo.data);
      this._handleDataMessage({data: data});
    }

    this._chunkedData[id] = chunkInfo;
    return;
  }

  this.emit('data', data);
}

/**
 * Exposed functionality for users.
 */

/** Allows user to close connection. */
DataConnection.prototype.close = function() {
  if (!this.open) {
    return;
  }
  this.open = false;
  Negotiator.cleanup(this);
  this.emit('close');
}

/** Allows user to send data. */
DataConnection.prototype.send = function(data, chunked) {
  if (!this.open) {
    this.emit('error', new Error('Connection is not open. You should listen for the `open` event before sending messages.'));
    return;
  }
  if (this._reliable) {
    // Note: reliable shim sending will make it so that you cannot customize
    // serialization.
    this._reliable.send(data);
    return;
  }
  var self = this;
  if (this.serialization === 'json') {
    this._bufferedSend(JSON.stringify(data));
  } else if (this.serialization === 'binary' || this.serialization === 'binary-utf8') {
    var blob = util.pack(data);

    // For Chrome-Firefox interoperability, we need to make Firefox "chunk"
    // the data it sends out.
    var needsChunking = util.chunkedBrowsers[this._peerBrowser] || util.chunkedBrowsers[util.browser];
    if (needsChunking && !chunked && blob.size > util.chunkedMTU) {
      this._sendChunks(blob);
      return;
    }

    // DataChannel currently only supports strings.
    if (!util.supports.sctp) {
      util.blobToBinaryString(blob, function(str) {
        self._bufferedSend(str);
      });
    } else if (!util.supports.binaryBlob) {
      // We only do this if we really need to (e.g. blobs are not supported),
      // because this conversion is costly.
      util.blobToArrayBuffer(blob, function(ab) {
        self._bufferedSend(ab);
      });
    } else {
      this._bufferedSend(blob);
    }
  } else {
    this._bufferedSend(data);
  }
}

DataConnection.prototype._bufferedSend = function(msg) {
  if (this._buffering || !this._trySend(msg)) {
    this._buffer.push(msg);
    this.bufferSize = this._buffer.length;
  }
}

// Returns true if the send succeeds.
DataConnection.prototype._trySend = function(msg) {
  try {
    this._dc.send(msg);
  } catch (e) {
    this._buffering = true;

    var self = this;
    setTimeout(function() {
      // Try again.
      self._buffering = false;
      self._tryBuffer();
    }, 100);
    return false;
  }
  return true;
}

// Try to send the first message in the buffer.
DataConnection.prototype._tryBuffer = function() {
  if (this._buffer.length === 0) {
    return;
  }

  var msg = this._buffer[0];

  if (this._trySend(msg)) {
    this._buffer.shift();
    this.bufferSize = this._buffer.length;
    this._tryBuffer();
  }
}

DataConnection.prototype._sendChunks = function(blob) {
  var blobs = util.chunk(blob);
  for (var i = 0, ii = blobs.length; i < ii; i += 1) {
    var blob = blobs[i];
    this.send(blob, true);
  }
}

DataConnection.prototype.handleMessage = function(message) {
  var payload = message.payload;

  switch (message.type) {
    case 'ANSWER':
      this._peerBrowser = payload.browser;

      // Forward to negotiator
      Negotiator.handleSDP(message.type, this, payload.sdp);
      break;
    case 'CANDIDATE':
      Negotiator.handleCandidate(this, payload.candidate);
      break;
    default:
      util.warn('Unrecognized message type:', message.type, 'from peer:', this.peer);
      break;
  }
}

module.exports = DataConnection;

},{"./negotiator":5,"./util":8,"eventemitter3":9,"reliable":12}],3:[function(require,module,exports){
window.Socket = require('./socket');
window.MediaConnection = require('./mediaconnection');
window.DataConnection = require('./dataconnection');
window.Peer = require('./peer');
window.RTCPeerConnection = require('./adapter').RTCPeerConnection;
window.RTCSessionDescription = require('./adapter').RTCSessionDescription;
window.RTCIceCandidate = require('./adapter').RTCIceCandidate;
window.Negotiator = require('./negotiator');
window.util = require('./util');
window.BinaryPack = require('js-binarypack');

},{"./adapter":1,"./dataconnection":2,"./mediaconnection":4,"./negotiator":5,"./peer":6,"./socket":7,"./util":8,"js-binarypack":10}],4:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');
var Negotiator = require('./negotiator');

/**
 * Wraps the streaming interface between two Peers.
 */
function MediaConnection(peer, provider, options) {
  if (!(this instanceof MediaConnection)) return new MediaConnection(peer, provider, options);
  EventEmitter.call(this);

  this.options = util.extend({}, options);

  this.open = false;
  this.type = 'media';
  this.peer = peer;
  this.provider = provider;
  this.metadata = this.options.metadata;
  this.localStream = this.options._stream;

  this.id = this.options.connectionId || MediaConnection._idPrefix + util.randomToken();
  if (this.localStream) {
    Negotiator.startConnection(
      this,
      {_stream: this.localStream, originator: true}
    );
  }
};

util.inherits(MediaConnection, EventEmitter);

MediaConnection._idPrefix = 'mc_';

MediaConnection.prototype.addStream = function(remoteStream) {
  util.log('Receiving stream', remoteStream);

  this.remoteStream = remoteStream;
  this.emit('stream', remoteStream); // Should we call this `open`?

};

MediaConnection.prototype.handleMessage = function(message) {
  var payload = message.payload;

  switch (message.type) {
    case 'ANSWER':
      // Forward to negotiator
      Negotiator.handleSDP(message.type, this, payload.sdp);
      this.open = true;
      break;
    case 'CANDIDATE':
      Negotiator.handleCandidate(this, payload.candidate);
      break;
    default:
      util.warn('Unrecognized message type:', message.type, 'from peer:', this.peer);
      break;
  }
}

MediaConnection.prototype.answer = function(stream) {
  if (this.localStream) {
    util.warn('Local stream already exists on this MediaConnection. Are you answering a call twice?');
    return;
  }

  this.options._payload._stream = stream;

  this.localStream = stream;
  Negotiator.startConnection(
    this,
    this.options._payload
  )
  // Retrieve lost messages stored because PeerConnection not set up.
  var messages = this.provider._getMessages(this.id);
  for (var i = 0, ii = messages.length; i < ii; i += 1) {
    this.handleMessage(messages[i]);
  }
  this.open = true;
};

/**
 * Exposed functionality for users.
 */

/** Allows user to close connection. */
MediaConnection.prototype.close = function() {
  if (!this.open) {
    return;
  }
  this.open = false;
  Negotiator.cleanup(this);
  this.emit('close')
};

module.exports = MediaConnection;

},{"./negotiator":5,"./util":8,"eventemitter3":9}],5:[function(require,module,exports){
var util = require("./util");
var RTCPeerConnection = require("./adapter").RTCPeerConnection;
var RTCSessionDescription = require("./adapter").RTCSessionDescription;
var RTCIceCandidate = require("./adapter").RTCIceCandidate;

/**
 * Manages all negotiations between Peers.
 */
var Negotiator = {
  pcs: {
    data: {},
    media: {}
  }, // type => {peerId: {pc_id: pc}}.
  //providers: {}, // provider's id => providers (there may be multiple providers/client.
  queue: [] // connections that are delayed due to a PC being in use.
};

Negotiator._idPrefix = "pc_";

/** Returns a PeerConnection object set up correctly (for data, media). */
Negotiator.startConnection = function(connection, options) {
  var pc = Negotiator._getPeerConnection(connection, options);

  // Set the connection's PC.
  connection.pc = connection.peerConnection = pc;

  if (connection.type === "media" && options._stream) {
    // Add the stream.
    pc.addStream(options._stream);
  }

  // What do we need to do now?
  if (options.originator) {
    if (connection.type === "data") {
      // Create the datachannel.
      var config = {};
      // Dropping reliable:false support, since it seems to be crashing
      // Chrome.
      /*if (util.supports.sctp && !options.reliable) {
        // If we have canonical reliable support...
        config = {maxRetransmits: 0};
      }*/
      // Fallback to ensure older browsers don't crash.
      if (!util.supports.sctp) {
        config = { reliable: options.reliable };
      }
      var dc = pc.createDataChannel(connection.label, config);
      connection.initialize(dc);
    }

    Negotiator._makeOffer(connection);
  } else {
    Negotiator.handleSDP("OFFER", connection, options.sdp);
  }
};

Negotiator._getPeerConnection = function(connection, options) {
  if (!Negotiator.pcs[connection.type]) {
    util.error(
      connection.type +
        " is not a valid connection type. Maybe you overrode the `type` property somewhere."
    );
  }

  if (!Negotiator.pcs[connection.type][connection.peer]) {
    Negotiator.pcs[connection.type][connection.peer] = {};
  }
  var peerConnections = Negotiator.pcs[connection.type][connection.peer];

  var pc;
  // Not multiplexing while FF and Chrome have not-great support for it.
  /*if (options.multiplex) {
    ids = Object.keys(peerConnections);
    for (var i = 0, ii = ids.length; i < ii; i += 1) {
      pc = peerConnections[ids[i]];
      if (pc.signalingState === 'stable') {
        break; // We can go ahead and use this PC.
      }
    }
  } else */
  if (options.pc) {
    // Simplest case: PC id already provided for us.
    pc = Negotiator.pcs[connection.type][connection.peer][options.pc];
  }

  if (!pc || pc.signalingState !== "stable") {
    pc = Negotiator._startPeerConnection(connection);
  }
  return pc;
};

/*
Negotiator._addProvider = function(provider) {
  if ((!provider.id && !provider.disconnected) || !provider.socket.open) {
    // Wait for provider to obtain an ID.
    provider.on('open', function(id) {
      Negotiator._addProvider(provider);
    });
  } else {
    Negotiator.providers[provider.id] = provider;
  }
}*/

/** Start a PC. */
Negotiator._startPeerConnection = function(connection) {
  util.log("Creating RTCPeerConnection.");

  var id = Negotiator._idPrefix + util.randomToken();
  var optional = {};

  if (connection.type === "data" && !util.supports.sctp) {
    optional = { optional: [{ RtpDataChannels: true }] };
  } else if (connection.type === "media") {
    // Interop req for chrome.
    optional = { optional: [{ DtlsSrtpKeyAgreement: true }] };
  }

  var pc = new RTCPeerConnection(connection.provider.options.config, optional);
  Negotiator.pcs[connection.type][connection.peer][id] = pc;

  Negotiator._setupListeners(connection, pc, id);

  return pc;
};

/** Set up various WebRTC listeners. */
Negotiator._setupListeners = function(connection, pc, pc_id) {
  var peerId = connection.peer;
  var connectionId = connection.id;
  var provider = connection.provider;

  // ICE CANDIDATES.
  util.log("Listening for ICE candidates.");
  pc.onicecandidate = function(evt) {
    if (evt.candidate) {
      util.log("Received ICE candidates for:", connection.peer);
      provider.socket.send({
        type: "CANDIDATE",
        payload: {
          candidate: evt.candidate,
          type: connection.type,
          connectionId: connection.id
        },
        dst: peerId
      });
    }
  };

  pc.oniceconnectionstatechange = function() {
    switch (pc.iceConnectionState) {
      case "failed":
        util.log(
          "iceConnectionState is disconnected, closing connections to " + peerId
        );
        connection.emit(
          "error",
          new Error("Negotiation of connection to " + peerId + " failed.")
        );
        connection.close();
        break;
      case "disconnected":
        util.log(
          "iceConnectionState is disconnected, closing connections to " + peerId
        );
        connection.close();
        break;
      case "completed":
        pc.onicecandidate = util.noop;
        break;
    }
  };

  // Fallback for older Chrome impls.
  pc.onicechange = pc.oniceconnectionstatechange;

  // DATACONNECTION.
  util.log("Listening for data channel");
  // Fired between offer and answer, so options should already be saved
  // in the options hash.
  pc.ondatachannel = function(evt) {
    util.log("Received data channel");
    var dc = evt.channel;
    var connection = provider.getConnection(peerId, connectionId);
    connection.initialize(dc);
  };

  // MEDIACONNECTION.
  util.log("Listening for remote stream");
  pc.onaddstream = function(evt) {
    util.log("Received remote stream");
    var stream = evt.stream;
    var connection = provider.getConnection(peerId, connectionId);
    // 10/10/2014: looks like in Chrome 38, onaddstream is triggered after
    // setting the remote description. Our connection object in these cases
    // is actually a DATA connection, so addStream fails.
    // TODO: This is hopefully just a temporary fix. We should try to
    // understand why this is happening.
    if (connection.type === "media") {
      connection.addStream(stream);
    }
  };
};

Negotiator.cleanup = function(connection) {
  util.log("Cleaning up PeerConnection to " + connection.peer);

  var pc = connection.pc;

  if (
    !!pc &&
    ((pc.readyState && pc.readyState !== "closed") ||
      pc.signalingState !== "closed")
  ) {
    pc.close();
    connection.pc = null;
  }
};

Negotiator._makeOffer = function(connection) {
  var pc = connection.pc;
  pc.createOffer(
    function(offer) {
      util.log("Created offer.");

      if (
        !util.supports.sctp &&
        connection.type === "data" &&
        connection.reliable
      ) {
        offer.sdp = Reliable.higherBandwidthSDP(offer.sdp);
      }

      pc.setLocalDescription(
        offer,
        function() {
          util.log("Set localDescription: offer", "for:", connection.peer);
          connection.provider.socket.send({
            type: "OFFER",
            payload: {
              sdp: offer,
              type: connection.type,
              label: connection.label,
              connectionId: connection.id,
              reliable: connection.reliable,
              serialization: connection.serialization,
              metadata: connection.metadata,
              browser: util.browser
            },
            dst: connection.peer
          });
        },
        function(err) {
          // TODO: investigate why _makeOffer is being called from the answer
          if (
            err !=
            "OperationError: Failed to set local offer sdp: Called in wrong state: kHaveRemoteOffer"
          ) {
            connection.provider.emitError("webrtc", err);
            util.log("Failed to setLocalDescription, ", err);
          }
        }
      );
    },
    function(err) {
      connection.provider.emitError("webrtc", err);
      util.log("Failed to createOffer, ", err);
    },
    connection.options.constraints
  );
};

Negotiator._makeAnswer = function(connection) {
  var pc = connection.pc;

  pc.createAnswer(
    function(answer) {
      util.log("Created answer.");

      if (
        !util.supports.sctp &&
        connection.type === "data" &&
        connection.reliable
      ) {
        answer.sdp = Reliable.higherBandwidthSDP(answer.sdp);
      }

      pc.setLocalDescription(
        answer,
        function() {
          util.log("Set localDescription: answer", "for:", connection.peer);
          connection.provider.socket.send({
            type: "ANSWER",
            payload: {
              sdp: answer,
              type: connection.type,
              connectionId: connection.id,
              browser: util.browser
            },
            dst: connection.peer
          });
        },
        function(err) {
          connection.provider.emitError("webrtc", err);
          util.log("Failed to setLocalDescription, ", err);
        }
      );
    },
    function(err) {
      connection.provider.emitError("webrtc", err);
      util.log("Failed to create answer, ", err);
    }
  );
};

/** Handle an SDP. */
Negotiator.handleSDP = function(type, connection, sdp) {
  sdp = new RTCSessionDescription(sdp);
  var pc = connection.pc;

  util.log("Setting remote description", sdp);
  pc.setRemoteDescription(
    sdp,
    function() {
      util.log("Set remoteDescription:", type, "for:", connection.peer);

      if (type === "OFFER") {
        Negotiator._makeAnswer(connection);
      }
    },
    function(err) {
      connection.provider.emitError("webrtc", err);
      util.log("Failed to setRemoteDescription, ", err);
    }
  );
};

/** Handle a candidate. */
Negotiator.handleCandidate = function(connection, ice) {
  var candidate = ice.candidate;
  var sdpMLineIndex = ice.sdpMLineIndex;
  connection.pc.addIceCandidate(
    new RTCIceCandidate({
      sdpMLineIndex: sdpMLineIndex,
      candidate: candidate
    })
  );
  util.log("Added ICE candidate for:", connection.peer);
};

module.exports = Negotiator;

},{"./adapter":1,"./util":8}],6:[function(require,module,exports){
var util = require("./util");
var EventEmitter = require("eventemitter3");
var Socket = require("./socket");
var MediaConnection = require("./mediaconnection");
var DataConnection = require("./dataconnection");

/**
 * A peer who can initiate connections with other peers.
 */
function Peer(id, options) {
  if (!(this instanceof Peer)) return new Peer(id, options);
  EventEmitter.call(this);

  // Deal with overloading
  if (id && id.constructor == Object) {
    options = id;
    id = undefined;
  } else if (id) {
    // Ensure id is a string
    id = id.toString();
  }
  //

  // Configurize options
  options = util.extend(
    {
      debug: 0, // 1: Errors, 2: Warnings, 3: All logs
      host: util.CLOUD_HOST,
      port: util.CLOUD_PORT,
      path: "/",
      token: util.randomToken(),
      config: util.defaultConfig
    },
    options
  );
  options.key = "peerjs";
  this.options = options;
  // Detect relative URL host.
  if (options.host === "/") {
    options.host = window.location.hostname;
  }
  // Set path correctly.
  if (options.path[0] !== "/") {
    options.path = "/" + options.path;
  }
  if (options.path[options.path.length - 1] !== "/") {
    options.path += "/";
  }

  // Set whether we use SSL to same as current host
  if (options.secure === undefined && options.host !== util.CLOUD_HOST) {
    options.secure = util.isSecure();
  }
  // Set a custom log function if present
  if (options.logFunction) {
    util.setLogFunction(options.logFunction);
  }
  util.setLogLevel(options.debug);
  //

  // Sanity checks
  // Ensure WebRTC supported
  if (!util.supports.audioVideo && !util.supports.data) {
    this._delayedAbort(
      "browser-incompatible",
      "The current browser does not support WebRTC"
    );
    return;
  }
  // Ensure alphanumeric id
  if (!util.validateId(id)) {
    this._delayedAbort("invalid-id", 'ID "' + id + '" is invalid');
    return;
  }
  // Ensure valid key
  // if (!util.validateKey(options.key)) {
  //   this._delayedAbort(
  //     "invalid-key",
  //     'API KEY "' + options.key + '" is invalid'
  //   );
  //   return;
  // }
  // Ensure not using unsecure cloud server on SSL page
  // if (options.secure && options.host === "0.peerjs.com") {
  //   this._delayedAbort(
  //     "ssl-unavailable",
  //     "The cloud server currently does not support HTTPS. Please run your own PeerServer to use HTTPS."
  //   );
  //   return;
  // }
  //

  // States.
  this.destroyed = false; // Connections have been killed
  this.disconnected = false; // Connection to PeerServer killed but P2P connections still active
  this.open = false; // Sockets and such are not yet open.
  //

  // References
  this.connections = {}; // DataConnections for this peer.
  this._lostMessages = {}; // src => [list of messages]
  //

  // Start the server connection
  this._initializeServerConnection();
  if (id) {
    this._initialize(id);
  } else {
    this._retrieveId();
  }
  //
}

util.inherits(Peer, EventEmitter);

// Initialize the 'socket' (which is actually a mix of XHR streaming and
// websockets.)
Peer.prototype._initializeServerConnection = function() {
  var self = this;
  this.socket = new Socket(
    this.options.secure,
    this.options.host,
    this.options.port,
    this.options.path,
    this.options.key,
    this.options.wsport
  );
  this.socket.on("message", function(data) {
    self._handleMessage(data);
  });
  this.socket.on("error", function(error) {
    self._abort("socket-error", error);
  });
  this.socket.on("disconnected", function() {
    // If we haven't explicitly disconnected, emit error and disconnect.
    if (!self.disconnected) {
      self.emitError("network", "Lost connection to server.");
      self.disconnect();
    }
  });
  this.socket.on("close", function() {
    // If we haven't explicitly disconnected, emit error.
    if (!self.disconnected) {
      self._abort("socket-closed", "Underlying socket is already closed.");
    }
  });
};

/** Get a unique ID from the server via XHR. */
Peer.prototype._retrieveId = function(cb) {
  var self = this;
  var http = new XMLHttpRequest();
  var protocol = this.options.secure ? "https://" : "http://";
  var url =
    protocol +
    this.options.host +
    ":" +
    this.options.port +
    this.options.path +
    this.options.key +
    "/id";
  var queryString = "?ts=" + new Date().getTime() + "" + Math.random();
  url += queryString;

  // If there's no ID we need to wait for one before trying to init socket.
  http.open("get", url, true);
  http.onerror = function(e) {
    util.error("Error retrieving ID", e);
    var pathError = "";
    if (self.options.path === "/" && self.options.host !== util.CLOUD_HOST) {
      pathError =
        " If you passed in a `path` to your self-hosted PeerServer, " +
        "you'll also need to pass in that same path when creating a new " +
        "Peer.";
    }
    self._abort(
      "server-error",
      "Could not get an ID from the server." + pathError
    );
  };
  http.onreadystatechange = function() {
    if (http.readyState !== 4) {
      return;
    }
    if (http.status !== 200) {
      http.onerror();
      return;
    }
    self._initialize(http.responseText);
  };
  http.send(null);
};

/** Initialize a connection with the server. */
Peer.prototype._initialize = function(id) {
  this.id = id;
  this.socket.start(this.id, this.options.token);
};

/** Handles messages from the server. */
Peer.prototype._handleMessage = function(message) {
  var type = message.type;
  var payload = message.payload;
  var peer = message.src;
  var connection;

  switch (type) {
    case "OPEN": // The connection to the server is open.
      this.emit("open", this.id);
      this.open = true;
      break;
    case "ERROR": // Server error.
      this._abort("server-error", payload.msg);
      break;
    case "ID-TAKEN": // The selected ID is taken.
      this._abort("unavailable-id", "ID `" + this.id + "` is taken");
      break;
    case "INVALID-KEY": // The given API key cannot be found.
      this._abort(
        "invalid-key",
        'API KEY "' + this.options.key + '" is invalid'
      );
      break;

    //
    case "LEAVE": // Another peer has closed its connection to this peer.
      util.log("Received leave message from", peer);
      this._cleanupPeer(peer);
      break;

    case "EXPIRE": // The offer sent to a peer has expired without response.
      this.emitError("peer-unavailable", "Could not connect to peer " + peer);
      break;
    case "OFFER": // we should consider switching this to CALL/CONNECT, but this is the least breaking option.
      var connectionId = payload.connectionId;
      connection = this.getConnection(peer, connectionId);

      if (connection) {
        connection.close();
        util.warn("Offer received for existing Connection ID:", connectionId);
      }

      // Create a new connection.
      if (payload.type === "media") {
        connection = new MediaConnection(peer, this, {
          connectionId: connectionId,
          _payload: payload,
          metadata: payload.metadata
        });
        this._addConnection(peer, connection);
        this.emit("call", connection);
      } else if (payload.type === "data") {
        connection = new DataConnection(peer, this, {
          connectionId: connectionId,
          _payload: payload,
          metadata: payload.metadata,
          label: payload.label,
          serialization: payload.serialization,
          reliable: payload.reliable
        });
        this._addConnection(peer, connection);
        this.emit("connection", connection);
      } else {
        util.warn("Received malformed connection type:", payload.type);
        return;
      }
      // Find messages.
      var messages = this._getMessages(connectionId);
      for (var i = 0, ii = messages.length; i < ii; i += 1) {
        connection.handleMessage(messages[i]);
      }

      break;
    default:
      if (!payload) {
        util.warn(
          "You received a malformed message from " + peer + " of type " + type
        );
        return;
      }

      var id = payload.connectionId;
      connection = this.getConnection(peer, id);

      if (connection && connection.pc) {
        // Pass it on.
        connection.handleMessage(message);
      } else if (id) {
        // Store for possible later use
        this._storeMessage(id, message);
      } else {
        util.warn("You received an unrecognized message:", message);
      }
      break;
  }
};

/** Stores messages without a set up connection, to be claimed later. */
Peer.prototype._storeMessage = function(connectionId, message) {
  if (!this._lostMessages[connectionId]) {
    this._lostMessages[connectionId] = [];
  }
  this._lostMessages[connectionId].push(message);
};

/** Retrieve messages from lost message store */
Peer.prototype._getMessages = function(connectionId) {
  var messages = this._lostMessages[connectionId];
  if (messages) {
    delete this._lostMessages[connectionId];
    return messages;
  } else {
    return [];
  }
};

/**
 * Returns a DataConnection to the specified peer. See documentation for a
 * complete list of options.
 */
Peer.prototype.connect = function(peer, options) {
  if (this.disconnected) {
    util.warn(
      "You cannot connect to a new Peer because you called " +
        ".disconnect() on this Peer and ended your connection with the " +
        "server. You can create a new Peer to reconnect, or call reconnect " +
        "on this peer if you believe its ID to still be available."
    );
    this.emitError(
      "disconnected",
      "Cannot connect to new Peer after disconnecting from server."
    );
    return;
  }
  var connection = new DataConnection(peer, this, options);
  this._addConnection(peer, connection);
  return connection;
};

/**
 * Returns a MediaConnection to the specified peer. See documentation for a
 * complete list of options.
 */
Peer.prototype.call = function(peer, stream, options) {
  if (this.disconnected) {
    util.warn(
      "You cannot connect to a new Peer because you called " +
        ".disconnect() on this Peer and ended your connection with the " +
        "server. You can create a new Peer to reconnect."
    );
    this.emitError(
      "disconnected",
      "Cannot connect to new Peer after disconnecting from server."
    );
    return;
  }
  if (!stream) {
    util.error(
      "To call a peer, you must provide a stream from your browser's `getUserMedia`."
    );
    return;
  }
  options = options || {};
  options._stream = stream;
  var call = new MediaConnection(peer, this, options);
  this._addConnection(peer, call);
  return call;
};

/** Add a data/media connection to this peer. */
Peer.prototype._addConnection = function(peer, connection) {
  if (!this.connections[peer]) {
    this.connections[peer] = [];
  }
  this.connections[peer].push(connection);
};

/** Retrieve a data/media connection for this peer. */
Peer.prototype.getConnection = function(peer, id) {
  var connections = this.connections[peer];
  if (!connections) {
    return null;
  }
  for (var i = 0, ii = connections.length; i < ii; i++) {
    if (connections[i].id === id) {
      return connections[i];
    }
  }
  return null;
};

Peer.prototype._delayedAbort = function(type, message) {
  var self = this;
  util.setZeroTimeout(function() {
    self._abort(type, message);
  });
};

/**
 * Destroys the Peer and emits an error message.
 * The Peer is not destroyed if it's in a disconnected state, in which case
 * it retains its disconnected state and its existing connections.
 */
Peer.prototype._abort = function(type, message) {
  util.error("Aborting!");
  if (!this._lastServerId) {
    this.destroy();
  } else {
    this.disconnect();
  }
  this.emitError(type, message);
};

/** Emits a typed error message. */
Peer.prototype.emitError = function(type, err) {
  util.error("Error:", err);
  if (typeof err === "string") {
    err = new Error(err);
  }
  err.type = type;
  this.emit("error", err);
};

/**
 * Destroys the Peer: closes all active connections as well as the connection
 *  to the server.
 * Warning: The peer can no longer create or accept connections after being
 *  destroyed.
 */
Peer.prototype.destroy = function() {
  if (!this.destroyed) {
    this._cleanup();
    this.disconnect();
    this.destroyed = true;
  }
};

/** Disconnects every connection on this peer. */
Peer.prototype._cleanup = function() {
  if (this.connections) {
    var peers = Object.keys(this.connections);
    for (var i = 0, ii = peers.length; i < ii; i++) {
      this._cleanupPeer(peers[i]);
    }
  }
  this.emit("close");
};

/** Closes all connections to this peer. */
Peer.prototype._cleanupPeer = function(peer) {
  var connections = this.connections[peer];
  for (var j = 0, jj = connections.length; j < jj; j += 1) {
    connections[j].close();
  }
};

/**
 * Disconnects the Peer's connection to the PeerServer. Does not close any
 *  active connections.
 * Warning: The peer can no longer create or accept connections after being
 *  disconnected. It also cannot reconnect to the server.
 */
Peer.prototype.disconnect = function() {
  var self = this;
  util.setZeroTimeout(function() {
    if (!self.disconnected) {
      self.disconnected = true;
      self.open = false;
      if (self.socket) {
        self.socket.close();
      }
      self.emit("disconnected", self.id);
      self._lastServerId = self.id;
      self.id = null;
    }
  });
};

/** Attempts to reconnect with the same ID. */
Peer.prototype.reconnect = function() {
  if (this.disconnected && !this.destroyed) {
    util.log("Attempting reconnection to server with ID " + this._lastServerId);
    this.disconnected = false;
    this._initializeServerConnection();
    this._initialize(this._lastServerId);
  } else if (this.destroyed) {
    throw new Error(
      "This peer cannot reconnect to the server. It has already been destroyed."
    );
  } else if (!this.disconnected && !this.open) {
    // Do nothing. We're still connecting the first time.
    util.error(
      "In a hurry? We're still trying to make the initial connection!"
    );
  } else {
    throw new Error(
      "Peer " +
        this.id +
        " cannot reconnect because it is not disconnected from the server!"
    );
  }
};

/**
 * Get a list of available peer IDs. If you're running your own server, you'll
 * want to set allow_discovery: true in the PeerServer options. If you're using
 * the cloud server, email team@peerjs.com to get the functionality enabled for
 * your key.
 */
Peer.prototype.listAllPeers = function(cb) {
  cb = cb || function() {};
  var self = this;
  var http = new XMLHttpRequest();
  var protocol = this.options.secure ? "https://" : "http://";
  var url =
    protocol +
    this.options.host +
    ":" +
    this.options.port +
    this.options.path +
    this.options.key +
    "/peers";
  var queryString = "?ts=" + new Date().getTime() + "" + Math.random();
  url += queryString;

  // If there's no ID we need to wait for one before trying to init socket.
  http.open("get", url, true);
  http.onerror = function(e) {
    self._abort("server-error", "Could not get peers from the server.");
    cb([]);
  };
  http.onreadystatechange = function() {
    if (http.readyState !== 4) {
      return;
    }
    if (http.status === 401) {
      var helpfulError = "";
      if (self.options.host !== util.CLOUD_HOST) {
        helpfulError =
          "It looks like you're using the cloud server. You can email " +
          "team@peerjs.com to enable peer listing for your API key.";
      } else {
        helpfulError =
          "You need to enable `allow_discovery` on your self-hosted " +
          "PeerServer to use this feature.";
      }
      cb([]);
      throw new Error(
        "It doesn't look like you have permission to list peers IDs. " +
          helpfulError
      );
    } else if (http.status !== 200) {
      cb([]);
    } else {
      cb(JSON.parse(http.responseText));
    }
  };
  http.send(null);
};

module.exports = Peer;

},{"./dataconnection":2,"./mediaconnection":4,"./socket":7,"./util":8,"eventemitter3":9}],7:[function(require,module,exports){
var util = require('./util');
var EventEmitter = require('eventemitter3');

/**
 * An abstraction on top of WebSockets and XHR streaming to provide fastest
 * possible connection for peers.
 */
function Socket(secure, host, port, path, key, wsport) {
  if (!(this instanceof Socket)) return new Socket(secure, host, port, path, key, wsport);

  wsport = wsport || port;

  EventEmitter.call(this);

  // Disconnected manually.
  this.disconnected = false;
  this._queue = [];

  var httpProtocol = secure ? 'https://' : 'http://';
  var wsProtocol = secure ? 'wss://' : 'ws://';
  this._httpUrl = httpProtocol + host + ':' + port + path + key;
  this._wsUrl = wsProtocol + host + ':' + wsport + path + 'peerjs?key=' + key;
}

util.inherits(Socket, EventEmitter);


/** Check in with ID or get one from server. */
Socket.prototype.start = function(id, token) {
  this.id = id;

  this._httpUrl += '/' + id + '/' + token;
  this._wsUrl += '&id=' + id + '&token=' + token;

  this._startXhrStream();
  this._startWebSocket();
}


/** Start up websocket communications. */
Socket.prototype._startWebSocket = function(id) {
  var self = this;

  if (this._socket) {
    return;
  }

  this._socket = new WebSocket(this._wsUrl);

  this._socket.onmessage = function(event) {
    try {
      var data = JSON.parse(event.data);
    } catch(e) {
      util.log('Invalid server message', event.data);
      return;
    }
    self.emit('message', data);
  };

  this._socket.onclose = function(event) {
    util.log('Socket closed.');
    self.disconnected = true;
    self.emit('disconnected');
  };

  // Take care of the queue of connections if necessary and make sure Peer knows
  // socket is open.
  this._socket.onopen = function() {
    if (self._timeout) {
      clearTimeout(self._timeout);
      setTimeout(function(){
        self._http.abort();
        self._http = null;
      }, 5000);
    }
    self._sendQueuedMessages();
    util.log('Socket open');
  };
}

/** Start XHR streaming. */
Socket.prototype._startXhrStream = function(n) {
  try {
    var self = this;
    this._http = new XMLHttpRequest();
    this._http._index = 1;
    this._http._streamIndex = n || 0;
    this._http.open('post', this._httpUrl + '/id?i=' + this._http._streamIndex, true);
    this._http.onerror = function() {
      // If we get an error, likely something went wrong.
      // Stop streaming.
      clearTimeout(self._timeout);
      self.emit('disconnected');
    }
    this._http.onreadystatechange = function() {
      if (this.readyState == 2 && this.old) {
        this.old.abort();
        delete this.old;
      } else if (this.readyState > 2 && this.status === 200 && this.responseText) {
        self._handleStream(this);
      }
    };
    this._http.send(null);
    this._setHTTPTimeout();
  } catch(e) {
    util.log('XMLHttpRequest not available; defaulting to WebSockets');
  }
}


/** Handles onreadystatechange response as a stream. */
Socket.prototype._handleStream = function(http) {
  // 3 and 4 are loading/done state. All others are not relevant.
  var messages = http.responseText.split('\n');

  // Check to see if anything needs to be processed on buffer.
  if (http._buffer) {
    while (http._buffer.length > 0) {
      var index = http._buffer.shift();
      var bufferedMessage = messages[index];
      try {
        bufferedMessage = JSON.parse(bufferedMessage);
      } catch(e) {
        http._buffer.shift(index);
        break;
      }
      this.emit('message', bufferedMessage);
    }
  }

  var message = messages[http._index];
  if (message) {
    http._index += 1;
    // Buffering--this message is incomplete and we'll get to it next time.
    // This checks if the httpResponse ended in a `\n`, in which case the last
    // element of messages should be the empty string.
    if (http._index === messages.length) {
      if (!http._buffer) {
        http._buffer = [];
      }
      http._buffer.push(http._index - 1);
    } else {
      try {
        message = JSON.parse(message);
      } catch(e) {
        util.log('Invalid server message', message);
        return;
      }
      this.emit('message', message);
    }
  }
}

Socket.prototype._setHTTPTimeout = function() {
  var self = this;
  this._timeout = setTimeout(function() {
    var old = self._http;
    if (!self._wsOpen()) {
      self._startXhrStream(old._streamIndex + 1);
      self._http.old = old;
    } else {
      old.abort();
    }
  }, 25000);
}

/** Is the websocket currently open? */
Socket.prototype._wsOpen = function() {
  return this._socket && this._socket.readyState == 1;
}

/** Send queued messages. */
Socket.prototype._sendQueuedMessages = function() {
  for (var i = 0, ii = this._queue.length; i < ii; i += 1) {
    this.send(this._queue[i]);
  }
}

/** Exposed send for DC & Peer. */
Socket.prototype.send = function(data) {
  if (this.disconnected) {
    return;
  }

  // If we didn't get an ID yet, we can't yet send anything so we should queue
  // up these messages.
  if (!this.id) {
    this._queue.push(data);
    return;
  }

  if (!data.type) {
    this.emit('error', 'Invalid message');
    return;
  }

  var message = JSON.stringify(data);
  if (this._wsOpen()) {
    this._socket.send(message);
  } else {
    var http = new XMLHttpRequest();
    var url = this._httpUrl + '/' + data.type.toLowerCase();
    http.open('post', url, true);
    http.setRequestHeader('Content-Type', 'application/json');
    http.send(message);
  }
}

Socket.prototype.close = function() {
  if (!this.disconnected && this._wsOpen()) {
    this._socket.close();
    this.disconnected = true;
  }
}

module.exports = Socket;

},{"./util":8,"eventemitter3":9}],8:[function(require,module,exports){
var defaultConfig = { iceServers: [{ url: "stun:stun.l.google.com:19302" }] };
var dataCount = 1;

var BinaryPack = require("js-binarypack");
var RTCPeerConnection = require("./adapter").RTCPeerConnection;

var util = {
  noop: function() {},

  CLOUD_HOST: "0.peerjs.com",
  CLOUD_PORT: 9000,

  // Browsers that need chunking:
  chunkedBrowsers: { Chrome: 1 },
  chunkedMTU: 16300, // The original 60000 bytes setting does not work when sending data from Firefox to Chrome, which is "cut off" after 16384 bytes and delivered individually.

  // Logging logic
  logLevel: 0,
  setLogLevel: function(level) {
    var debugLevel = parseInt(level, 10);
    if (!isNaN(parseInt(level, 10))) {
      util.logLevel = debugLevel;
    } else {
      // If they are using truthy/falsy values for debug
      util.logLevel = level ? 3 : 0;
    }
    util.log = util.warn = util.error = util.noop;
    if (util.logLevel > 0) {
      util.error = util._printWith("ERROR");
    }
    if (util.logLevel > 1) {
      util.warn = util._printWith("WARNING");
    }
    if (util.logLevel > 2) {
      util.log = util._print;
    }
  },
  setLogFunction: function(fn) {
    if (fn.constructor !== Function) {
      util.warn(
        "The log function you passed in is not a function. Defaulting to regular logs."
      );
    } else {
      util._print = fn;
    }
  },

  _printWith: function(prefix) {
    return function() {
      var copy = Array.prototype.slice.call(arguments);
      copy.unshift(prefix);
      util._print.apply(util, copy);
    };
  },
  _print: function() {
    var err = false;
    var copy = Array.prototype.slice.call(arguments);
    copy.unshift("PeerJS: ");
    for (var i = 0, l = copy.length; i < l; i++) {
      if (copy[i] instanceof Error) {
        copy[i] = "(" + copy[i].name + ") " + copy[i].message;
        err = true;
      }
    }
    err ? console.error.apply(console, copy) : console.log.apply(console, copy);
  },
  //

  // Returns browser-agnostic default config
  defaultConfig: defaultConfig,
  //

  // Returns the current browser.
  browser: (function() {
    if (window.mozRTCPeerConnection) {
      return "Firefox";
    } else if (window.webkitRTCPeerConnection) {
      return "Chrome";
    } else if (window.RTCPeerConnection) {
      return "Supported";
    } else {
      return "Unsupported";
    }
  })(),
  //

  // Lists which features are supported
  supports: (function() {
    if (typeof RTCPeerConnection === "undefined") {
      return {};
    }

    var data = true;
    var audioVideo = true;

    var binaryBlob = false;
    var sctp = false;
    var onnegotiationneeded = !!window.webkitRTCPeerConnection;

    var pc, dc;
    try {
      pc = new RTCPeerConnection(defaultConfig, {
        optional: [{ RtpDataChannels: true }]
      });
    } catch (e) {
      data = false;
      audioVideo = false;
    }

    if (data) {
      try {
        dc = pc.createDataChannel("_PEERJSTEST");
      } catch (e) {
        data = false;
      }
    }

    if (data) {
      // Binary test
      try {
        dc.binaryType = "blob";
        binaryBlob = true;
      } catch (e) {}

      // Reliable test.
      // Unfortunately Chrome is a bit unreliable about whether or not they
      // support reliable.
      var reliablePC = new RTCPeerConnection(defaultConfig, {});
      try {
        var reliableDC = reliablePC.createDataChannel(
          "_PEERJSRELIABLETEST",
          {}
        );
        sctp = reliableDC.reliable;
      } catch (e) {}
      reliablePC.close();
    }

    // FIXME: not really the best check...
    if (audioVideo) {
      audioVideo = !!pc.addStream;
    }

    // FIXME: this is not great because in theory it doesn't work for
    // av-only browsers (?).
    /*
    if (!onnegotiationneeded && data) {
      // sync default check.
      var negotiationPC = new RTCPeerConnection(defaultConfig, {optional: [{RtpDataChannels: true}]});
      negotiationPC.onnegotiationneeded = function() {
        onnegotiationneeded = true;
        // async check.
        if (util && util.supports) {
          util.supports.onnegotiationneeded = true;
        }
      };
      negotiationPC.createDataChannel('_PEERJSNEGOTIATIONTEST');

      setTimeout(function() {
        negotiationPC.close();
      }, 1000);
    }
    */

    if (pc) {
      pc.close();
    }

    return {
      audioVideo: audioVideo,
      data: data,
      binaryBlob: binaryBlob,
      binary: sctp, // deprecated; sctp implies binary support.
      reliable: sctp, // deprecated; sctp implies reliable data.
      sctp: sctp,
      onnegotiationneeded: onnegotiationneeded
    };
  })(),
  //

  // Ensure alphanumeric ids
  validateId: function(id) {
    // Allow empty ids
    return !id || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.exec(id);
  },

  validateKey: function(key) {
    // Allow empty keys
    return !key || /^[A-Za-z0-9]+(?:[ _-][A-Za-z0-9]+)*$/.exec(key);
  },

  debug: false,

  inherits: function(ctor, superCtor) {
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  },
  extend: function(dest, source) {
    for (var key in source) {
      if (source.hasOwnProperty(key)) {
        dest[key] = source[key];
      }
    }
    return dest;
  },
  pack: BinaryPack.pack,
  unpack: BinaryPack.unpack,

  log: function() {
    if (util.debug) {
      var err = false;
      var copy = Array.prototype.slice.call(arguments);
      copy.unshift("PeerJS: ");
      for (var i = 0, l = copy.length; i < l; i++) {
        if (copy[i] instanceof Error) {
          copy[i] = "(" + copy[i].name + ") " + copy[i].message;
          err = true;
        }
      }
      err
        ? console.error.apply(console, copy)
        : console.log.apply(console, copy);
    }
  },

  setZeroTimeout: (function(global) {
    var timeouts = [];
    var messageName = "zero-timeout-message";

    // Like setTimeout, but only takes a function argument.	 There's
    // no time argument (always zero) and no arguments (you have to
    // use a closure).
    function setZeroTimeoutPostMessage(fn) {
      timeouts.push(fn);
      global.postMessage(messageName, "*");
    }

    function handleMessage(event) {
      if (event.source == global && event.data == messageName) {
        if (event.stopPropagation) {
          event.stopPropagation();
        }
        if (timeouts.length) {
          timeouts.shift()();
        }
      }
    }
    if (global.addEventListener) {
      global.addEventListener("message", handleMessage, true);
    } else if (global.attachEvent) {
      global.attachEvent("onmessage", handleMessage);
    }
    return setZeroTimeoutPostMessage;
  })(window),

  // Binary stuff

  // chunks a blob.
  chunk: function(bl) {
    var chunks = [];
    var size = bl.size;
    var start = (index = 0);
    var total = Math.ceil(size / util.chunkedMTU);
    while (start < size) {
      var end = Math.min(size, start + util.chunkedMTU);
      var b = bl.slice(start, end);

      var chunk = {
        __peerData: dataCount,
        n: index,
        data: b,
        total: total
      };

      chunks.push(chunk);

      start = end;
      index += 1;
    }
    dataCount += 1;
    return chunks;
  },

  blobToArrayBuffer: function(blob, cb) {
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsArrayBuffer(blob);
  },
  blobToBinaryString: function(blob, cb) {
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsBinaryString(blob);
  },
  binaryStringToArrayBuffer: function(binary) {
    var byteArray = new Uint8Array(binary.length);
    for (var i = 0; i < binary.length; i++) {
      byteArray[i] = binary.charCodeAt(i) & 0xff;
    }
    return byteArray.buffer;
  },
  randomToken: function() {
    return Math.random()
      .toString(36)
      .substr(2);
  },
  //

  isSecure: function() {
    return location.protocol === "https:";
  }
};

module.exports = util;

},{"./adapter":1,"js-binarypack":10}],9:[function(require,module,exports){
'use strict';

/**
 * Representation of a single EventEmitter function.
 *
 * @param {Function} fn Event handler to be called.
 * @param {Mixed} context Context for function execution.
 * @param {Boolean} once Only emit once
 * @api private
 */
function EE(fn, context, once) {
  this.fn = fn;
  this.context = context;
  this.once = once || false;
}

/**
 * Minimal EventEmitter interface that is molded against the Node.js
 * EventEmitter interface.
 *
 * @constructor
 * @api public
 */
function EventEmitter() { /* Nothing to set */ }

/**
 * Holds the assigned EventEmitters by name.
 *
 * @type {Object}
 * @private
 */
EventEmitter.prototype._events = undefined;

/**
 * Return a list of assigned event listeners.
 *
 * @param {String} event The events that should be listed.
 * @returns {Array}
 * @api public
 */
EventEmitter.prototype.listeners = function listeners(event) {
  if (!this._events || !this._events[event]) return [];
  if (this._events[event].fn) return [this._events[event].fn];

  for (var i = 0, l = this._events[event].length, ee = new Array(l); i < l; i++) {
    ee[i] = this._events[event][i].fn;
  }

  return ee;
};

/**
 * Emit an event to all registered event listeners.
 *
 * @param {String} event The name of the event.
 * @returns {Boolean} Indication if we've emitted an event.
 * @api public
 */
EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
  if (!this._events || !this._events[event]) return false;

  var listeners = this._events[event]
    , len = arguments.length
    , args
    , i;

  if ('function' === typeof listeners.fn) {
    if (listeners.once) this.removeListener(event, listeners.fn, true);

    switch (len) {
      case 1: return listeners.fn.call(listeners.context), true;
      case 2: return listeners.fn.call(listeners.context, a1), true;
      case 3: return listeners.fn.call(listeners.context, a1, a2), true;
      case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
      case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
      case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
    }

    for (i = 1, args = new Array(len -1); i < len; i++) {
      args[i - 1] = arguments[i];
    }

    listeners.fn.apply(listeners.context, args);
  } else {
    var length = listeners.length
      , j;

    for (i = 0; i < length; i++) {
      if (listeners[i].once) this.removeListener(event, listeners[i].fn, true);

      switch (len) {
        case 1: listeners[i].fn.call(listeners[i].context); break;
        case 2: listeners[i].fn.call(listeners[i].context, a1); break;
        case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
        default:
          if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
            args[j - 1] = arguments[j];
          }

          listeners[i].fn.apply(listeners[i].context, args);
      }
    }
  }

  return true;
};

/**
 * Register a new EventListener for the given event.
 *
 * @param {String} event Name of the event.
 * @param {Functon} fn Callback function.
 * @param {Mixed} context The context of the function.
 * @api public
 */
EventEmitter.prototype.on = function on(event, fn, context) {
  var listener = new EE(fn, context || this);

  if (!this._events) this._events = {};
  if (!this._events[event]) this._events[event] = listener;
  else {
    if (!this._events[event].fn) this._events[event].push(listener);
    else this._events[event] = [
      this._events[event], listener
    ];
  }

  return this;
};

/**
 * Add an EventListener that's only called once.
 *
 * @param {String} event Name of the event.
 * @param {Function} fn Callback function.
 * @param {Mixed} context The context of the function.
 * @api public
 */
EventEmitter.prototype.once = function once(event, fn, context) {
  var listener = new EE(fn, context || this, true);

  if (!this._events) this._events = {};
  if (!this._events[event]) this._events[event] = listener;
  else {
    if (!this._events[event].fn) this._events[event].push(listener);
    else this._events[event] = [
      this._events[event], listener
    ];
  }

  return this;
};

/**
 * Remove event listeners.
 *
 * @param {String} event The event we want to remove.
 * @param {Function} fn The listener that we need to find.
 * @param {Boolean} once Only remove once listeners.
 * @api public
 */
EventEmitter.prototype.removeListener = function removeListener(event, fn, once) {
  if (!this._events || !this._events[event]) return this;

  var listeners = this._events[event]
    , events = [];

  if (fn) {
    if (listeners.fn && (listeners.fn !== fn || (once && !listeners.once))) {
      events.push(listeners);
    }
    if (!listeners.fn) for (var i = 0, length = listeners.length; i < length; i++) {
      if (listeners[i].fn !== fn || (once && !listeners[i].once)) {
        events.push(listeners[i]);
      }
    }
  }

  //
  // Reset the array, or remove it completely if we have no more listeners.
  //
  if (events.length) {
    this._events[event] = events.length === 1 ? events[0] : events;
  } else {
    delete this._events[event];
  }

  return this;
};

/**
 * Remove all listeners or only the listeners for the specified event.
 *
 * @param {String} event The event want to remove all listeners for.
 * @api public
 */
EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
  if (!this._events) return this;

  if (event) delete this._events[event];
  else this._events = {};

  return this;
};

//
// Alias methods names because people roll like that.
//
EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
EventEmitter.prototype.addListener = EventEmitter.prototype.on;

//
// This function doesn't apply anymore.
//
EventEmitter.prototype.setMaxListeners = function setMaxListeners() {
  return this;
};

//
// Expose the module.
//
EventEmitter.EventEmitter = EventEmitter;
EventEmitter.EventEmitter2 = EventEmitter;
EventEmitter.EventEmitter3 = EventEmitter;

//
// Expose the module.
//
module.exports = EventEmitter;

},{}],10:[function(require,module,exports){
var BufferBuilder = require('./bufferbuilder').BufferBuilder;
var binaryFeatures = require('./bufferbuilder').binaryFeatures;

var BinaryPack = {
  unpack: function(data){
    var unpacker = new Unpacker(data);
    return unpacker.unpack();
  },
  pack: function(data){
    var packer = new Packer();
    packer.pack(data);
    var buffer = packer.getBuffer();
    return buffer;
  }
};

module.exports = BinaryPack;

function Unpacker (data){
  // Data is ArrayBuffer
  this.index = 0;
  this.dataBuffer = data;
  this.dataView = new Uint8Array(this.dataBuffer);
  this.length = this.dataBuffer.byteLength;
}

Unpacker.prototype.unpack = function(){
  var type = this.unpack_uint8();
  if (type < 0x80){
    var positive_fixnum = type;
    return positive_fixnum;
  } else if ((type ^ 0xe0) < 0x20){
    var negative_fixnum = (type ^ 0xe0) - 0x20;
    return negative_fixnum;
  }
  var size;
  if ((size = type ^ 0xa0) <= 0x0f){
    return this.unpack_raw(size);
  } else if ((size = type ^ 0xb0) <= 0x0f){
    return this.unpack_string(size);
  } else if ((size = type ^ 0x90) <= 0x0f){
    return this.unpack_array(size);
  } else if ((size = type ^ 0x80) <= 0x0f){
    return this.unpack_map(size);
  }
  switch(type){
    case 0xc0:
      return null;
    case 0xc1:
      return undefined;
    case 0xc2:
      return false;
    case 0xc3:
      return true;
    case 0xca:
      return this.unpack_float();
    case 0xcb:
      return this.unpack_double();
    case 0xcc:
      return this.unpack_uint8();
    case 0xcd:
      return this.unpack_uint16();
    case 0xce:
      return this.unpack_uint32();
    case 0xcf:
      return this.unpack_uint64();
    case 0xd0:
      return this.unpack_int8();
    case 0xd1:
      return this.unpack_int16();
    case 0xd2:
      return this.unpack_int32();
    case 0xd3:
      return this.unpack_int64();
    case 0xd4:
      return undefined;
    case 0xd5:
      return undefined;
    case 0xd6:
      return undefined;
    case 0xd7:
      return undefined;
    case 0xd8:
      size = this.unpack_uint16();
      return this.unpack_string(size);
    case 0xd9:
      size = this.unpack_uint32();
      return this.unpack_string(size);
    case 0xda:
      size = this.unpack_uint16();
      return this.unpack_raw(size);
    case 0xdb:
      size = this.unpack_uint32();
      return this.unpack_raw(size);
    case 0xdc:
      size = this.unpack_uint16();
      return this.unpack_array(size);
    case 0xdd:
      size = this.unpack_uint32();
      return this.unpack_array(size);
    case 0xde:
      size = this.unpack_uint16();
      return this.unpack_map(size);
    case 0xdf:
      size = this.unpack_uint32();
      return this.unpack_map(size);
  }
}

Unpacker.prototype.unpack_uint8 = function(){
  var byte = this.dataView[this.index] & 0xff;
  this.index++;
  return byte;
};

Unpacker.prototype.unpack_uint16 = function(){
  var bytes = this.read(2);
  var uint16 =
    ((bytes[0] & 0xff) * 256) + (bytes[1] & 0xff);
  this.index += 2;
  return uint16;
}

Unpacker.prototype.unpack_uint32 = function(){
  var bytes = this.read(4);
  var uint32 =
     ((bytes[0]  * 256 +
       bytes[1]) * 256 +
       bytes[2]) * 256 +
       bytes[3];
  this.index += 4;
  return uint32;
}

Unpacker.prototype.unpack_uint64 = function(){
  var bytes = this.read(8);
  var uint64 =
   ((((((bytes[0]  * 256 +
       bytes[1]) * 256 +
       bytes[2]) * 256 +
       bytes[3]) * 256 +
       bytes[4]) * 256 +
       bytes[5]) * 256 +
       bytes[6]) * 256 +
       bytes[7];
  this.index += 8;
  return uint64;
}


Unpacker.prototype.unpack_int8 = function(){
  var uint8 = this.unpack_uint8();
  return (uint8 < 0x80 ) ? uint8 : uint8 - (1 << 8);
};

Unpacker.prototype.unpack_int16 = function(){
  var uint16 = this.unpack_uint16();
  return (uint16 < 0x8000 ) ? uint16 : uint16 - (1 << 16);
}

Unpacker.prototype.unpack_int32 = function(){
  var uint32 = this.unpack_uint32();
  return (uint32 < Math.pow(2, 31) ) ? uint32 :
    uint32 - Math.pow(2, 32);
}

Unpacker.prototype.unpack_int64 = function(){
  var uint64 = this.unpack_uint64();
  return (uint64 < Math.pow(2, 63) ) ? uint64 :
    uint64 - Math.pow(2, 64);
}

Unpacker.prototype.unpack_raw = function(size){
  if ( this.length < this.index + size){
    throw new Error('BinaryPackFailure: index is out of range'
      + ' ' + this.index + ' ' + size + ' ' + this.length);
  }
  var buf = this.dataBuffer.slice(this.index, this.index + size);
  this.index += size;

    //buf = util.bufferToString(buf);

  return buf;
}

Unpacker.prototype.unpack_string = function(size){
  var bytes = this.read(size);
  var i = 0, str = '', c, code;
  while(i < size){
    c = bytes[i];
    if ( c < 128){
      str += String.fromCharCode(c);
      i++;
    } else if ((c ^ 0xc0) < 32){
      code = ((c ^ 0xc0) << 6) | (bytes[i+1] & 63);
      str += String.fromCharCode(code);
      i += 2;
    } else {
      code = ((c & 15) << 12) | ((bytes[i+1] & 63) << 6) |
        (bytes[i+2] & 63);
      str += String.fromCharCode(code);
      i += 3;
    }
  }
  this.index += size;
  return str;
}

Unpacker.prototype.unpack_array = function(size){
  var objects = new Array(size);
  for(var i = 0; i < size ; i++){
    objects[i] = this.unpack();
  }
  return objects;
}

Unpacker.prototype.unpack_map = function(size){
  var map = {};
  for(var i = 0; i < size ; i++){
    var key  = this.unpack();
    var value = this.unpack();
    map[key] = value;
  }
  return map;
}

Unpacker.prototype.unpack_float = function(){
  var uint32 = this.unpack_uint32();
  var sign = uint32 >> 31;
  var exp  = ((uint32 >> 23) & 0xff) - 127;
  var fraction = ( uint32 & 0x7fffff ) | 0x800000;
  return (sign == 0 ? 1 : -1) *
    fraction * Math.pow(2, exp - 23);
}

Unpacker.prototype.unpack_double = function(){
  var h32 = this.unpack_uint32();
  var l32 = this.unpack_uint32();
  var sign = h32 >> 31;
  var exp  = ((h32 >> 20) & 0x7ff) - 1023;
  var hfrac = ( h32 & 0xfffff ) | 0x100000;
  var frac = hfrac * Math.pow(2, exp - 20) +
    l32   * Math.pow(2, exp - 52);
  return (sign == 0 ? 1 : -1) * frac;
}

Unpacker.prototype.read = function(length){
  var j = this.index;
  if (j + length <= this.length) {
    return this.dataView.subarray(j, j + length);
  } else {
    throw new Error('BinaryPackFailure: read index out of range');
  }
}

function Packer(){
  this.bufferBuilder = new BufferBuilder();
}

Packer.prototype.getBuffer = function(){
  return this.bufferBuilder.getBuffer();
}

Packer.prototype.pack = function(value){
  var type = typeof(value);
  if (type == 'string'){
    this.pack_string(value);
  } else if (type == 'number'){
    if (Math.floor(value) === value){
      this.pack_integer(value);
    } else{
      this.pack_double(value);
    }
  } else if (type == 'boolean'){
    if (value === true){
      this.bufferBuilder.append(0xc3);
    } else if (value === false){
      this.bufferBuilder.append(0xc2);
    }
  } else if (type == 'undefined'){
    this.bufferBuilder.append(0xc0);
  } else if (type == 'object'){
    if (value === null){
      this.bufferBuilder.append(0xc0);
    } else {
      var constructor = value.constructor;
      if (constructor == Array){
        this.pack_array(value);
      } else if (constructor == Blob || constructor == File) {
        this.pack_bin(value);
      } else if (constructor == ArrayBuffer) {
        if(binaryFeatures.useArrayBufferView) {
          this.pack_bin(new Uint8Array(value));
        } else {
          this.pack_bin(value);
        }
      } else if ('BYTES_PER_ELEMENT' in value){
        if(binaryFeatures.useArrayBufferView) {
          this.pack_bin(new Uint8Array(value.buffer));
        } else {
          this.pack_bin(value.buffer);
        }
      } else if (constructor == Object){
        this.pack_object(value);
      } else if (constructor == Date){
        this.pack_string(value.toString());
      } else if (typeof value.toBinaryPack == 'function'){
        this.bufferBuilder.append(value.toBinaryPack());
      } else {
        throw new Error('Type "' + constructor.toString() + '" not yet supported');
      }
    }
  } else {
    throw new Error('Type "' + type + '" not yet supported');
  }
  this.bufferBuilder.flush();
}


Packer.prototype.pack_bin = function(blob){
  var length = blob.length || blob.byteLength || blob.size;
  if (length <= 0x0f){
    this.pack_uint8(0xa0 + length);
  } else if (length <= 0xffff){
    this.bufferBuilder.append(0xda) ;
    this.pack_uint16(length);
  } else if (length <= 0xffffffff){
    this.bufferBuilder.append(0xdb);
    this.pack_uint32(length);
  } else{
    throw new Error('Invalid length');
  }
  this.bufferBuilder.append(blob);
}

Packer.prototype.pack_string = function(str){
  var length = utf8Length(str);

  if (length <= 0x0f){
    this.pack_uint8(0xb0 + length);
  } else if (length <= 0xffff){
    this.bufferBuilder.append(0xd8) ;
    this.pack_uint16(length);
  } else if (length <= 0xffffffff){
    this.bufferBuilder.append(0xd9);
    this.pack_uint32(length);
  } else{
    throw new Error('Invalid length');
  }
  this.bufferBuilder.append(str);
}

Packer.prototype.pack_array = function(ary){
  var length = ary.length;
  if (length <= 0x0f){
    this.pack_uint8(0x90 + length);
  } else if (length <= 0xffff){
    this.bufferBuilder.append(0xdc)
    this.pack_uint16(length);
  } else if (length <= 0xffffffff){
    this.bufferBuilder.append(0xdd);
    this.pack_uint32(length);
  } else{
    throw new Error('Invalid length');
  }
  for(var i = 0; i < length ; i++){
    this.pack(ary[i]);
  }
}

Packer.prototype.pack_integer = function(num){
  if ( -0x20 <= num && num <= 0x7f){
    this.bufferBuilder.append(num & 0xff);
  } else if (0x00 <= num && num <= 0xff){
    this.bufferBuilder.append(0xcc);
    this.pack_uint8(num);
  } else if (-0x80 <= num && num <= 0x7f){
    this.bufferBuilder.append(0xd0);
    this.pack_int8(num);
  } else if ( 0x0000 <= num && num <= 0xffff){
    this.bufferBuilder.append(0xcd);
    this.pack_uint16(num);
  } else if (-0x8000 <= num && num <= 0x7fff){
    this.bufferBuilder.append(0xd1);
    this.pack_int16(num);
  } else if ( 0x00000000 <= num && num <= 0xffffffff){
    this.bufferBuilder.append(0xce);
    this.pack_uint32(num);
  } else if (-0x80000000 <= num && num <= 0x7fffffff){
    this.bufferBuilder.append(0xd2);
    this.pack_int32(num);
  } else if (-0x8000000000000000 <= num && num <= 0x7FFFFFFFFFFFFFFF){
    this.bufferBuilder.append(0xd3);
    this.pack_int64(num);
  } else if (0x0000000000000000 <= num && num <= 0xFFFFFFFFFFFFFFFF){
    this.bufferBuilder.append(0xcf);
    this.pack_uint64(num);
  } else{
    throw new Error('Invalid integer');
  }
}

Packer.prototype.pack_double = function(num){
  var sign = 0;
  if (num < 0){
    sign = 1;
    num = -num;
  }
  var exp  = Math.floor(Math.log(num) / Math.LN2);
  var frac0 = num / Math.pow(2, exp) - 1;
  var frac1 = Math.floor(frac0 * Math.pow(2, 52));
  var b32   = Math.pow(2, 32);
  var h32 = (sign << 31) | ((exp+1023) << 20) |
      (frac1 / b32) & 0x0fffff;
  var l32 = frac1 % b32;
  this.bufferBuilder.append(0xcb);
  this.pack_int32(h32);
  this.pack_int32(l32);
}

Packer.prototype.pack_object = function(obj){
  var keys = Object.keys(obj);
  var length = keys.length;
  if (length <= 0x0f){
    this.pack_uint8(0x80 + length);
  } else if (length <= 0xffff){
    this.bufferBuilder.append(0xde);
    this.pack_uint16(length);
  } else if (length <= 0xffffffff){
    this.bufferBuilder.append(0xdf);
    this.pack_uint32(length);
  } else{
    throw new Error('Invalid length');
  }
  for(var prop in obj){
    if (obj.hasOwnProperty(prop)){
      this.pack(prop);
      this.pack(obj[prop]);
    }
  }
}

Packer.prototype.pack_uint8 = function(num){
  this.bufferBuilder.append(num);
}

Packer.prototype.pack_uint16 = function(num){
  this.bufferBuilder.append(num >> 8);
  this.bufferBuilder.append(num & 0xff);
}

Packer.prototype.pack_uint32 = function(num){
  var n = num & 0xffffffff;
  this.bufferBuilder.append((n & 0xff000000) >>> 24);
  this.bufferBuilder.append((n & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((n & 0x0000ff00) >>>  8);
  this.bufferBuilder.append((n & 0x000000ff));
}

Packer.prototype.pack_uint64 = function(num){
  var high = num / Math.pow(2, 32);
  var low  = num % Math.pow(2, 32);
  this.bufferBuilder.append((high & 0xff000000) >>> 24);
  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((high & 0x0000ff00) >>>  8);
  this.bufferBuilder.append((high & 0x000000ff));
  this.bufferBuilder.append((low  & 0xff000000) >>> 24);
  this.bufferBuilder.append((low  & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((low  & 0x0000ff00) >>>  8);
  this.bufferBuilder.append((low  & 0x000000ff));
}

Packer.prototype.pack_int8 = function(num){
  this.bufferBuilder.append(num & 0xff);
}

Packer.prototype.pack_int16 = function(num){
  this.bufferBuilder.append((num & 0xff00) >> 8);
  this.bufferBuilder.append(num & 0xff);
}

Packer.prototype.pack_int32 = function(num){
  this.bufferBuilder.append((num >>> 24) & 0xff);
  this.bufferBuilder.append((num & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((num & 0x0000ff00) >>> 8);
  this.bufferBuilder.append((num & 0x000000ff));
}

Packer.prototype.pack_int64 = function(num){
  var high = Math.floor(num / Math.pow(2, 32));
  var low  = num % Math.pow(2, 32);
  this.bufferBuilder.append((high & 0xff000000) >>> 24);
  this.bufferBuilder.append((high & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((high & 0x0000ff00) >>>  8);
  this.bufferBuilder.append((high & 0x000000ff));
  this.bufferBuilder.append((low  & 0xff000000) >>> 24);
  this.bufferBuilder.append((low  & 0x00ff0000) >>> 16);
  this.bufferBuilder.append((low  & 0x0000ff00) >>>  8);
  this.bufferBuilder.append((low  & 0x000000ff));
}

function _utf8Replace(m){
  var code = m.charCodeAt(0);

  if(code <= 0x7ff) return '00';
  if(code <= 0xffff) return '000';
  if(code <= 0x1fffff) return '0000';
  if(code <= 0x3ffffff) return '00000';
  return '000000';
}

function utf8Length(str){
  if (str.length > 600) {
    // Blob method faster for large strings
    return (new Blob([str])).size;
  } else {
    return str.replace(/[^\u0000-\u007F]/g, _utf8Replace).length;
  }
}

},{"./bufferbuilder":11}],11:[function(require,module,exports){
var binaryFeatures = {};
binaryFeatures.useBlobBuilder = (function(){
  try {
    new Blob([]);
    return false;
  } catch (e) {
    return true;
  }
})();

binaryFeatures.useArrayBufferView = !binaryFeatures.useBlobBuilder && (function(){
  try {
    return (new Blob([new Uint8Array([])])).size === 0;
  } catch (e) {
    return true;
  }
})();

module.exports.binaryFeatures = binaryFeatures;
var BlobBuilder = module.exports.BlobBuilder;
if (typeof window != 'undefined') {
  BlobBuilder = module.exports.BlobBuilder = window.WebKitBlobBuilder ||
    window.MozBlobBuilder || window.MSBlobBuilder || window.BlobBuilder;
}

function BufferBuilder(){
  this._pieces = [];
  this._parts = [];
}

BufferBuilder.prototype.append = function(data) {
  if(typeof data === 'number') {
    this._pieces.push(data);
  } else {
    this.flush();
    this._parts.push(data);
  }
};

BufferBuilder.prototype.flush = function() {
  if (this._pieces.length > 0) {
    var buf = new Uint8Array(this._pieces);
    if(!binaryFeatures.useArrayBufferView) {
      buf = buf.buffer;
    }
    this._parts.push(buf);
    this._pieces = [];
  }
};

BufferBuilder.prototype.getBuffer = function() {
  this.flush();
  if(binaryFeatures.useBlobBuilder) {
    var builder = new BlobBuilder();
    for(var i = 0, ii = this._parts.length; i < ii; i++) {
      builder.append(this._parts[i]);
    }
    return builder.getBlob();
  } else {
    return new Blob(this._parts);
  }
};

module.exports.BufferBuilder = BufferBuilder;

},{}],12:[function(require,module,exports){
var util = require('./util');

/**
 * Reliable transfer for Chrome Canary DataChannel impl.
 * Author: @michellebu
 */
function Reliable(dc, debug) {
  if (!(this instanceof Reliable)) return new Reliable(dc);
  this._dc = dc;

  util.debug = debug;

  // Messages sent/received so far.
  // id: { ack: n, chunks: [...] }
  this._outgoing = {};
  // id: { ack: ['ack', id, n], chunks: [...] }
  this._incoming = {};
  this._received = {};

  // Window size.
  this._window = 1000;
  // MTU.
  this._mtu = 500;
  // Interval for setInterval. In ms.
  this._interval = 0;

  // Messages sent.
  this._count = 0;

  // Outgoing message queue.
  this._queue = [];

  this._setupDC();
};

// Send a message reliably.
Reliable.prototype.send = function(msg) {
  // Determine if chunking is necessary.
  var bl = util.pack(msg);
  if (bl.size < this._mtu) {
    this._handleSend(['no', bl]);
    return;
  }

  this._outgoing[this._count] = {
    ack: 0,
    chunks: this._chunk(bl)
  };

  if (util.debug) {
    this._outgoing[this._count].timer = new Date();
  }

  // Send prelim window.
  this._sendWindowedChunks(this._count);
  this._count += 1;
};

// Set up interval for processing queue.
Reliable.prototype._setupInterval = function() {
  // TODO: fail gracefully.

  var self = this;
  this._timeout = setInterval(function() {
    // FIXME: String stuff makes things terribly async.
    var msg = self._queue.shift();
    if (msg._multiple) {
      for (var i = 0, ii = msg.length; i < ii; i += 1) {
        self._intervalSend(msg[i]);
      }
    } else {
      self._intervalSend(msg);
    }
  }, this._interval);
};

Reliable.prototype._intervalSend = function(msg) {
  var self = this;
  msg = util.pack(msg);
  util.blobToBinaryString(msg, function(str) {
    self._dc.send(str);
  });
  if (self._queue.length === 0) {
    clearTimeout(self._timeout);
    self._timeout = null;
    //self._processAcks();
  }
};

// Go through ACKs to send missing pieces.
Reliable.prototype._processAcks = function() {
  for (var id in this._outgoing) {
    if (this._outgoing.hasOwnProperty(id)) {
      this._sendWindowedChunks(id);
    }
  }
};

// Handle sending a message.
// FIXME: Don't wait for interval time for all messages...
Reliable.prototype._handleSend = function(msg) {
  var push = true;
  for (var i = 0, ii = this._queue.length; i < ii; i += 1) {
    var item = this._queue[i];
    if (item === msg) {
      push = false;
    } else if (item._multiple && item.indexOf(msg) !== -1) {
      push = false;
    }
  }
  if (push) {
    this._queue.push(msg);
    if (!this._timeout) {
      this._setupInterval();
    }
  }
};

// Set up DataChannel handlers.
Reliable.prototype._setupDC = function() {
  // Handle various message types.
  var self = this;
  this._dc.onmessage = function(e) {
    var msg = e.data;
    var datatype = msg.constructor;
    // FIXME: msg is String until binary is supported.
    // Once that happens, this will have to be smarter.
    if (datatype === String) {
      var ab = util.binaryStringToArrayBuffer(msg);
      msg = util.unpack(ab);
      self._handleMessage(msg);
    }
  };
};

// Handles an incoming message.
Reliable.prototype._handleMessage = function(msg) {
  var id = msg[1];
  var idata = this._incoming[id];
  var odata = this._outgoing[id];
  var data;
  switch (msg[0]) {
    // No chunking was done.
    case 'no':
      var message = id;
      if (!!message) {
        this.onmessage(util.unpack(message));
      }
      break;
    // Reached the end of the message.
    case 'end':
      data = idata;

      // In case end comes first.
      this._received[id] = msg[2];

      if (!data) {
        break;
      }

      this._ack(id);
      break;
    case 'ack':
      data = odata;
      if (!!data) {
        var ack = msg[2];
        // Take the larger ACK, for out of order messages.
        data.ack = Math.max(ack, data.ack);

        // Clean up when all chunks are ACKed.
        if (data.ack >= data.chunks.length) {
          util.log('Time: ', new Date() - data.timer);
          delete this._outgoing[id];
        } else {
          this._processAcks();
        }
      }
      // If !data, just ignore.
      break;
    // Received a chunk of data.
    case 'chunk':
      // Create a new entry if none exists.
      data = idata;
      if (!data) {
        var end = this._received[id];
        if (end === true) {
          break;
        }
        data = {
          ack: ['ack', id, 0],
          chunks: []
        };
        this._incoming[id] = data;
      }

      var n = msg[2];
      var chunk = msg[3];
      data.chunks[n] = new Uint8Array(chunk);

      // If we get the chunk we're looking for, ACK for next missing.
      // Otherwise, ACK the same N again.
      if (n === data.ack[2]) {
        this._calculateNextAck(id);
      }
      this._ack(id);
      break;
    default:
      // Shouldn't happen, but would make sense for message to just go
      // through as is.
      this._handleSend(msg);
      break;
  }
};

// Chunks BL into smaller messages.
Reliable.prototype._chunk = function(bl) {
  var chunks = [];
  var size = bl.size;
  var start = 0;
  while (start < size) {
    var end = Math.min(size, start + this._mtu);
    var b = bl.slice(start, end);
    var chunk = {
      payload: b
    }
    chunks.push(chunk);
    start = end;
  }
  util.log('Created', chunks.length, 'chunks.');
  return chunks;
};

// Sends ACK N, expecting Nth blob chunk for message ID.
Reliable.prototype._ack = function(id) {
  var ack = this._incoming[id].ack;

  // if ack is the end value, then call _complete.
  if (this._received[id] === ack[2]) {
    this._complete(id);
    this._received[id] = true;
  }

  this._handleSend(ack);
};

// Calculates the next ACK number, given chunks.
Reliable.prototype._calculateNextAck = function(id) {
  var data = this._incoming[id];
  var chunks = data.chunks;
  for (var i = 0, ii = chunks.length; i < ii; i += 1) {
    // This chunk is missing!!! Better ACK for it.
    if (chunks[i] === undefined) {
      data.ack[2] = i;
      return;
    }
  }
  data.ack[2] = chunks.length;
};

// Sends the next window of chunks.
Reliable.prototype._sendWindowedChunks = function(id) {
  util.log('sendWindowedChunks for: ', id);
  var data = this._outgoing[id];
  var ch = data.chunks;
  var chunks = [];
  var limit = Math.min(data.ack + this._window, ch.length);
  for (var i = data.ack; i < limit; i += 1) {
    if (!ch[i].sent || i === data.ack) {
      ch[i].sent = true;
      chunks.push(['chunk', id, i, ch[i].payload]);
    }
  }
  if (data.ack + this._window >= ch.length) {
    chunks.push(['end', id, ch.length])
  }
  chunks._multiple = true;
  this._handleSend(chunks);
};

// Puts together a message from chunks.
Reliable.prototype._complete = function(id) {
  util.log('Completed called for', id);
  var self = this;
  var chunks = this._incoming[id].chunks;
  var bl = new Blob(chunks);
  util.blobToArrayBuffer(bl, function(ab) {
    self.onmessage(util.unpack(ab));
  });
  delete this._incoming[id];
};

// Ups bandwidth limit on SDP. Meant to be called during offer/answer.
Reliable.higherBandwidthSDP = function(sdp) {
  // AS stands for Application-Specific Maximum.
  // Bandwidth number is in kilobits / sec.
  // See RFC for more info: http://www.ietf.org/rfc/rfc2327.txt

  // Chrome 31+ doesn't want us munging the SDP, so we'll let them have their
  // way.
  var version = navigator.appVersion.match(/Chrome\/(.*?) /);
  if (version) {
    version = parseInt(version[1].split('.').shift());
    if (version < 31) {
      var parts = sdp.split('b=AS:30');
      var replace = 'b=AS:102400'; // 100 Mbps
      if (parts.length > 1) {
        return parts[0] + replace + parts[1];
      }
    }
  }

  return sdp;
};

// Overwritten, typically.
Reliable.prototype.onmessage = function(msg) {};

module.exports.Reliable = Reliable;

},{"./util":13}],13:[function(require,module,exports){
var BinaryPack = require('js-binarypack');

var util = {
  debug: false,
  
  inherits: function(ctor, superCtor) {
    ctor.super_ = superCtor;
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  },
  extend: function(dest, source) {
    for(var key in source) {
      if(source.hasOwnProperty(key)) {
        dest[key] = source[key];
      }
    }
    return dest;
  },
  pack: BinaryPack.pack,
  unpack: BinaryPack.unpack,
  
  log: function () {
    if (util.debug) {
      var copy = [];
      for (var i = 0; i < arguments.length; i++) {
        copy[i] = arguments[i];
      }
      copy.unshift('Reliable: ');
      console.log.apply(console, copy);
    }
  },

  setZeroTimeout: (function(global) {
    var timeouts = [];
    var messageName = 'zero-timeout-message';

    // Like setTimeout, but only takes a function argument.	 There's
    // no time argument (always zero) and no arguments (you have to
    // use a closure).
    function setZeroTimeoutPostMessage(fn) {
      timeouts.push(fn);
      global.postMessage(messageName, '*');
    }		

    function handleMessage(event) {
      if (event.source == global && event.data == messageName) {
        if (event.stopPropagation) {
          event.stopPropagation();
        }
        if (timeouts.length) {
          timeouts.shift()();
        }
      }
    }
    if (global.addEventListener) {
      global.addEventListener('message', handleMessage, true);
    } else if (global.attachEvent) {
      global.attachEvent('onmessage', handleMessage);
    }
    return setZeroTimeoutPostMessage;
  }(this)),
  
  blobToArrayBuffer: function(blob, cb){
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsArrayBuffer(blob);
  },
  blobToBinaryString: function(blob, cb){
    var fr = new FileReader();
    fr.onload = function(evt) {
      cb(evt.target.result);
    };
    fr.readAsBinaryString(blob);
  },
  binaryStringToArrayBuffer: function(binary) {
    var byteArray = new Uint8Array(binary.length);
    for (var i = 0; i < binary.length; i++) {
      byteArray[i] = binary.charCodeAt(i) & 0xff;
    }
    return byteArray.buffer;
  },
  randomToken: function () {
    return Math.random().toString(36).substr(2);
  }
};

module.exports = util;

},{"js-binarypack":10}]},{},[3]);