webresock.js

(function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.webresock = f()}})(function(){var define,module,exports;return (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){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var Backoff = require('./lib/backoff');
var ExponentialBackoffStrategy = require('./lib/strategy/exponential');
var FibonacciBackoffStrategy = require('./lib/strategy/fibonacci');
var FunctionCall = require('./lib/function_call.js');

module.exports.Backoff = Backoff;
module.exports.FunctionCall = FunctionCall;
module.exports.FibonacciStrategy = FibonacciBackoffStrategy;
module.exports.ExponentialStrategy = ExponentialBackoffStrategy;

// Constructs a Fibonacci backoff.
module.exports.fibonacci = function(options) {
    return new Backoff(new FibonacciBackoffStrategy(options));
};

// Constructs an exponential backoff.
module.exports.exponential = function(options) {
    return new Backoff(new ExponentialBackoffStrategy(options));
};

// Constructs a FunctionCall for the given function and arguments.
module.exports.call = function(fn, vargs, callback) {
    var args = Array.prototype.slice.call(arguments);
    fn = args[0];
    vargs = args.slice(1, args.length - 1);
    callback = args[args.length - 1];
    return new FunctionCall(fn, vargs, callback);
};

},{"./lib/backoff":2,"./lib/function_call.js":3,"./lib/strategy/exponential":4,"./lib/strategy/fibonacci":5}],2:[function(require,module,exports){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var events = require('events');
var precond = require('precond');
var util = require('util');

// A class to hold the state of a backoff operation. Accepts a backoff strategy
// to generate the backoff delays.
function Backoff(backoffStrategy) {
    events.EventEmitter.call(this);

    this.backoffStrategy_ = backoffStrategy;
    this.maxNumberOfRetry_ = -1;
    this.backoffNumber_ = 0;
    this.backoffDelay_ = 0;
    this.timeoutID_ = -1;

    this.handlers = {
        backoff: this.onBackoff_.bind(this)
    };
}
util.inherits(Backoff, events.EventEmitter);

// Sets a limit, greater than 0, on the maximum number of backoffs. A 'fail'
// event will be emitted when the limit is reached.
Backoff.prototype.failAfter = function(maxNumberOfRetry) {
    precond.checkArgument(maxNumberOfRetry > 0,
        'Expected a maximum number of retry greater than 0 but got %s.',
        maxNumberOfRetry);

    this.maxNumberOfRetry_ = maxNumberOfRetry;
};

// Starts a backoff operation. Accepts an optional parameter to let the
// listeners know why the backoff operation was started.
Backoff.prototype.backoff = function(err) {
    precond.checkState(this.timeoutID_ === -1, 'Backoff in progress.');

    if (this.backoffNumber_ === this.maxNumberOfRetry_) {
        this.emit('fail', err);
        this.reset();
    } else {
        this.backoffDelay_ = this.backoffStrategy_.next();
        this.timeoutID_ = setTimeout(this.handlers.backoff, this.backoffDelay_);
        this.emit('backoff', this.backoffNumber_, this.backoffDelay_, err);
    }
};

// Handles the backoff timeout completion.
Backoff.prototype.onBackoff_ = function() {
    this.timeoutID_ = -1;
    this.emit('ready', this.backoffNumber_, this.backoffDelay_);
    this.backoffNumber_++;
};

// Stops any backoff operation and resets the backoff delay to its inital value.
Backoff.prototype.reset = function() {
    this.backoffNumber_ = 0;
    this.backoffStrategy_.reset();
    clearTimeout(this.timeoutID_);
    this.timeoutID_ = -1;
};

module.exports = Backoff;

},{"events":7,"precond":8,"util":15}],3:[function(require,module,exports){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var events = require('events');
var precond = require('precond');
var util = require('util');

var Backoff = require('./backoff');
var FibonacciBackoffStrategy = require('./strategy/fibonacci');

// Wraps a function to be called in a backoff loop.
function FunctionCall(fn, args, callback) {
    events.EventEmitter.call(this);

    precond.checkIsFunction(fn, 'Expected fn to be a function.');
    precond.checkIsArray(args, 'Expected args to be an array.');
    precond.checkIsFunction(callback, 'Expected callback to be a function.');

    this.function_ = fn;
    this.arguments_ = args;
    this.callback_ = callback;
    this.lastResult_ = [];
    this.numRetries_ = 0;

    this.backoff_ = null;
    this.strategy_ = null;
    this.failAfter_ = -1;
    this.retryPredicate_ = FunctionCall.DEFAULT_RETRY_PREDICATE_;

    this.state_ = FunctionCall.State_.PENDING;
}
util.inherits(FunctionCall, events.EventEmitter);

// States in which the call can be.
FunctionCall.State_ = {
    // Call isn't started yet.
    PENDING: 0,
    // Call is in progress.
    RUNNING: 1,
    // Call completed successfully which means that either the wrapped function
    // returned successfully or the maximal number of backoffs was reached.
    COMPLETED: 2,
    // The call was aborted.
    ABORTED: 3
};

// The default retry predicate which considers any error as retriable.
FunctionCall.DEFAULT_RETRY_PREDICATE_ = function(err) {
  return true;
};

// Checks whether the call is pending.
FunctionCall.prototype.isPending = function() {
    return this.state_ == FunctionCall.State_.PENDING;
};

// Checks whether the call is in progress.
FunctionCall.prototype.isRunning = function() {
    return this.state_ == FunctionCall.State_.RUNNING;
};

// Checks whether the call is completed.
FunctionCall.prototype.isCompleted = function() {
    return this.state_ == FunctionCall.State_.COMPLETED;
};

// Checks whether the call is aborted.
FunctionCall.prototype.isAborted = function() {
    return this.state_ == FunctionCall.State_.ABORTED;
};

// Sets the backoff strategy to use. Can only be called before the call is
// started otherwise an exception will be thrown.
FunctionCall.prototype.setStrategy = function(strategy) {
    precond.checkState(this.isPending(), 'FunctionCall in progress.');
    this.strategy_ = strategy;
    return this; // Return this for chaining.
};

// Sets the predicate which will be used to determine whether the errors
// returned from the wrapped function should be retried or not, e.g. a
// network error would be retriable while a type error would stop the
// function call.
FunctionCall.prototype.retryIf = function(retryPredicate) {
    precond.checkState(this.isPending(), 'FunctionCall in progress.');
    this.retryPredicate_ = retryPredicate;
    return this;
};

// Returns all intermediary results returned by the wrapped function since
// the initial call.
FunctionCall.prototype.getLastResult = function() {
    return this.lastResult_.concat();
};

// Returns the number of times the wrapped function call was retried.
FunctionCall.prototype.getNumRetries = function() {
    return this.numRetries_;
};

// Sets the backoff limit.
FunctionCall.prototype.failAfter = function(maxNumberOfRetry) {
    precond.checkState(this.isPending(), 'FunctionCall in progress.');
    this.failAfter_ = maxNumberOfRetry;
    return this; // Return this for chaining.
};

// Aborts the call.
FunctionCall.prototype.abort = function() {
    if (this.isCompleted() || this.isAborted()) {
      return;
    }

    if (this.isRunning()) {
        this.backoff_.reset();
    }

    this.state_ = FunctionCall.State_.ABORTED;
    this.lastResult_ = [new Error('Backoff aborted.')];
    this.emit('abort');
    this.doCallback_();
};

// Initiates the call to the wrapped function. Accepts an optional factory
// function used to create the backoff instance; used when testing.
FunctionCall.prototype.start = function(backoffFactory) {
    precond.checkState(!this.isAborted(), 'FunctionCall is aborted.');
    precond.checkState(this.isPending(), 'FunctionCall already started.');

    var strategy = this.strategy_ || new FibonacciBackoffStrategy();

    this.backoff_ = backoffFactory ?
        backoffFactory(strategy) :
        new Backoff(strategy);

    this.backoff_.on('ready', this.doCall_.bind(this, true /* isRetry */));
    this.backoff_.on('fail', this.doCallback_.bind(this));
    this.backoff_.on('backoff', this.handleBackoff_.bind(this));

    if (this.failAfter_ > 0) {
        this.backoff_.failAfter(this.failAfter_);
    }

    this.state_ = FunctionCall.State_.RUNNING;
    this.doCall_(false /* isRetry */);
};

// Calls the wrapped function.
FunctionCall.prototype.doCall_ = function(isRetry) {
    if (isRetry) {
        this.numRetries_++;
    }
    var eventArgs = ['call'].concat(this.arguments_);
    events.EventEmitter.prototype.emit.apply(this, eventArgs);
    var callback = this.handleFunctionCallback_.bind(this);
    this.function_.apply(null, this.arguments_.concat(callback));
};

// Calls the wrapped function's callback with the last result returned by the
// wrapped function.
FunctionCall.prototype.doCallback_ = function() {
    this.callback_.apply(null, this.lastResult_);
};

// Handles wrapped function's completion. This method acts as a replacement
// for the original callback function.
FunctionCall.prototype.handleFunctionCallback_ = function() {
    if (this.isAborted()) {
        return;
    }

    var args = Array.prototype.slice.call(arguments);
    this.lastResult_ = args; // Save last callback arguments.
    events.EventEmitter.prototype.emit.apply(this, ['callback'].concat(args));

    var err = args[0];
    if (err && this.retryPredicate_(err)) {
        this.backoff_.backoff(err);
    } else {
        this.state_ = FunctionCall.State_.COMPLETED;
        this.doCallback_();
    }
};

// Handles the backoff event by reemitting it.
FunctionCall.prototype.handleBackoff_ = function(number, delay, err) {
    this.emit('backoff', number, delay, err);
};

module.exports = FunctionCall;

},{"./backoff":2,"./strategy/fibonacci":5,"events":7,"precond":8,"util":15}],4:[function(require,module,exports){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var util = require('util');
var precond = require('precond');

var BackoffStrategy = require('./strategy');

// Exponential backoff strategy.
function ExponentialBackoffStrategy(options) {
    BackoffStrategy.call(this, options);
    this.backoffDelay_ = 0;
    this.nextBackoffDelay_ = this.getInitialDelay();
    this.factor_ = ExponentialBackoffStrategy.DEFAULT_FACTOR;

    if (options && options.factor !== undefined) {
        precond.checkArgument(options.factor > 1,
            'Exponential factor should be greater than 1 but got %s.',
            options.factor);
        this.factor_ = options.factor;
    }
}
util.inherits(ExponentialBackoffStrategy, BackoffStrategy);

// Default multiplication factor used to compute the next backoff delay from
// the current one. The value can be overridden by passing a custom factor as
// part of the options.
ExponentialBackoffStrategy.DEFAULT_FACTOR = 2;

ExponentialBackoffStrategy.prototype.next_ = function() {
    this.backoffDelay_ = Math.min(this.nextBackoffDelay_, this.getMaxDelay());
    this.nextBackoffDelay_ = this.backoffDelay_ * this.factor_;
    return this.backoffDelay_;
};

ExponentialBackoffStrategy.prototype.reset_ = function() {
    this.backoffDelay_ = 0;
    this.nextBackoffDelay_ = this.getInitialDelay();
};

module.exports = ExponentialBackoffStrategy;

},{"./strategy":6,"precond":8,"util":15}],5:[function(require,module,exports){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var util = require('util');

var BackoffStrategy = require('./strategy');

// Fibonacci backoff strategy.
function FibonacciBackoffStrategy(options) {
    BackoffStrategy.call(this, options);
    this.backoffDelay_ = 0;
    this.nextBackoffDelay_ = this.getInitialDelay();
}
util.inherits(FibonacciBackoffStrategy, BackoffStrategy);

FibonacciBackoffStrategy.prototype.next_ = function() {
    var backoffDelay = Math.min(this.nextBackoffDelay_, this.getMaxDelay());
    this.nextBackoffDelay_ += this.backoffDelay_;
    this.backoffDelay_ = backoffDelay;
    return backoffDelay;
};

FibonacciBackoffStrategy.prototype.reset_ = function() {
    this.nextBackoffDelay_ = this.getInitialDelay();
    this.backoffDelay_ = 0;
};

module.exports = FibonacciBackoffStrategy;

},{"./strategy":6,"util":15}],6:[function(require,module,exports){
//      Copyright (c) 2012 Mathieu Turcotte
//      Licensed under the MIT license.

var events = require('events');
var util = require('util');

function isDef(value) {
    return value !== undefined && value !== null;
}

// Abstract class defining the skeleton for the backoff strategies. Accepts an
// object holding the options for the backoff strategy:
//
//  * `randomisationFactor`: The randomisation factor which must be between 0
//     and 1 where 1 equates to a randomization factor of 100% and 0 to no
//     randomization.
//  * `initialDelay`: The backoff initial delay in milliseconds.
//  * `maxDelay`: The backoff maximal delay in milliseconds.
function BackoffStrategy(options) {
    options = options || {};

    if (isDef(options.initialDelay) && options.initialDelay < 1) {
        throw new Error('The initial timeout must be greater than 0.');
    } else if (isDef(options.maxDelay) && options.maxDelay < 1) {
        throw new Error('The maximal timeout must be greater than 0.');
    }

    this.initialDelay_ = options.initialDelay || 100;
    this.maxDelay_ = options.maxDelay || 10000;

    if (this.maxDelay_ <= this.initialDelay_) {
        throw new Error('The maximal backoff delay must be ' +
                        'greater than the initial backoff delay.');
    }

    if (isDef(options.randomisationFactor) &&
        (options.randomisationFactor < 0 || options.randomisationFactor > 1)) {
        throw new Error('The randomisation factor must be between 0 and 1.');
    }

    this.randomisationFactor_ = options.randomisationFactor || 0;
}

// Gets the maximal backoff delay.
BackoffStrategy.prototype.getMaxDelay = function() {
    return this.maxDelay_;
};

// Gets the initial backoff delay.
BackoffStrategy.prototype.getInitialDelay = function() {
    return this.initialDelay_;
};

// Template method that computes and returns the next backoff delay in
// milliseconds.
BackoffStrategy.prototype.next = function() {
    var backoffDelay = this.next_();
    var randomisationMultiple = 1 + Math.random() * this.randomisationFactor_;
    var randomizedDelay = Math.round(backoffDelay * randomisationMultiple);
    return randomizedDelay;
};

// Computes and returns the next backoff delay. Intended to be overridden by
// subclasses.
BackoffStrategy.prototype.next_ = function() {
    throw new Error('BackoffStrategy.next_() unimplemented.');
};

// Template method that resets the backoff delay to its initial value.
BackoffStrategy.prototype.reset = function() {
    this.reset_();
};

// Resets the backoff delay to its initial value. Intended to be overridden by
// subclasses.
BackoffStrategy.prototype.reset_ = function() {
    throw new Error('BackoffStrategy.reset_() unimplemented.');
};

module.exports = BackoffStrategy;

},{"events":7,"util":15}],7:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      } else {
        // At least give some kind of context to the user
        var err = new Error('Uncaught, unspecified "error" event. (' + er + ')');
        err.context = er;
        throw err;
      }
    }
  }

  handler = this._events[type];

  if (isUndefined(handler))
    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        args = Array.prototype.slice.call(arguments, 1);
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    args = Array.prototype.slice.call(arguments, 1);
    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    if (!isUndefined(this._maxListeners)) {
      m = this._maxListeners;
    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
      this._events[type].warned = true;
      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else if (listeners) {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.prototype.listenerCount = function(type) {
  if (this._events) {
    var evlistener = this._events[type];

    if (isFunction(evlistener))
      return 1;
    else if (evlistener)
      return evlistener.length;
  }
  return 0;
};

EventEmitter.listenerCount = function(emitter, type) {
  return emitter.listenerCount(type);
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}],8:[function(require,module,exports){
/*
 * Copyright (c) 2012 Mathieu Turcotte
 * Licensed under the MIT license.
 */

module.exports = require('./lib/checks');
},{"./lib/checks":9}],9:[function(require,module,exports){
/*
 * Copyright (c) 2012 Mathieu Turcotte
 * Licensed under the MIT license.
 */

var util = require('util');

var errors = module.exports = require('./errors');

function failCheck(ExceptionConstructor, callee, messageFormat, formatArgs) {
    messageFormat = messageFormat || '';
    var message = util.format.apply(this, [messageFormat].concat(formatArgs));
    var error = new ExceptionConstructor(message);
    Error.captureStackTrace(error, callee);
    throw error;
}

function failArgumentCheck(callee, message, formatArgs) {
    failCheck(errors.IllegalArgumentError, callee, message, formatArgs);
}

function failStateCheck(callee, message, formatArgs) {
    failCheck(errors.IllegalStateError, callee, message, formatArgs);
}

module.exports.checkArgument = function(value, message) {
    if (!value) {
        failArgumentCheck(arguments.callee, message,
            Array.prototype.slice.call(arguments, 2));
    }
};

module.exports.checkState = function(value, message) {
    if (!value) {
        failStateCheck(arguments.callee, message,
            Array.prototype.slice.call(arguments, 2));
    }
};

module.exports.checkIsDef = function(value, message) {
    if (value !== undefined) {
        return value;
    }

    failArgumentCheck(arguments.callee, message ||
        'Expected value to be defined but was undefined.',
        Array.prototype.slice.call(arguments, 2));
};

module.exports.checkIsDefAndNotNull = function(value, message) {
    // Note that undefined == null.
    if (value != null) {
        return value;
    }

    failArgumentCheck(arguments.callee, message ||
        'Expected value to be defined and not null but got "' +
        typeOf(value) + '".', Array.prototype.slice.call(arguments, 2));
};

// Fixed version of the typeOf operator which returns 'null' for null values
// and 'array' for arrays.
function typeOf(value) {
    var s = typeof value;
    if (s == 'object') {
        if (!value) {
            return 'null';
        } else if (value instanceof Array) {
            return 'array';
        }
    }
    return s;
}

function typeCheck(expect) {
    return function(value, message) {
        var type = typeOf(value);

        if (type == expect) {
            return value;
        }

        failArgumentCheck(arguments.callee, message ||
            'Expected "' + expect + '" but got "' + type + '".',
            Array.prototype.slice.call(arguments, 2));
    };
}

module.exports.checkIsString = typeCheck('string');
module.exports.checkIsArray = typeCheck('array');
module.exports.checkIsNumber = typeCheck('number');
module.exports.checkIsBoolean = typeCheck('boolean');
module.exports.checkIsFunction = typeCheck('function');
module.exports.checkIsObject = typeCheck('object');

},{"./errors":10,"util":15}],10:[function(require,module,exports){
/*
 * Copyright (c) 2012 Mathieu Turcotte
 * Licensed under the MIT license.
 */

var util = require('util');

function IllegalArgumentError(message) {
    Error.call(this, message);
    this.message = message;
}
util.inherits(IllegalArgumentError, Error);

IllegalArgumentError.prototype.name = 'IllegalArgumentError';

function IllegalStateError(message) {
    Error.call(this, message);
    this.message = message;
}
util.inherits(IllegalStateError, Error);

IllegalStateError.prototype.name = 'IllegalStateError';

module.exports.IllegalStateError = IllegalStateError;
module.exports.IllegalArgumentError = IllegalArgumentError;
},{"util":15}],11:[function(require,module,exports){
// shim for using process in browser
var process = module.exports = {};

// cached from whatever global is present so that test runners that stub it
// don't break things.  But we need to wrap it in a try catch in case it is
// wrapped in strict mode code which doesn't define any globals.  It's inside a
// function because try/catches deoptimize in certain engines.

var cachedSetTimeout;
var cachedClearTimeout;

function defaultSetTimout() {
    throw new Error('setTimeout has not been defined');
}
function defaultClearTimeout () {
    throw new Error('clearTimeout has not been defined');
}
(function () {
    try {
        if (typeof setTimeout === 'function') {
            cachedSetTimeout = setTimeout;
        } else {
            cachedSetTimeout = defaultSetTimout;
        }
    } catch (e) {
        cachedSetTimeout = defaultSetTimout;
    }
    try {
        if (typeof clearTimeout === 'function') {
            cachedClearTimeout = clearTimeout;
        } else {
            cachedClearTimeout = defaultClearTimeout;
        }
    } catch (e) {
        cachedClearTimeout = defaultClearTimeout;
    }
} ())
function runTimeout(fun) {
    if (cachedSetTimeout === setTimeout) {
        //normal enviroments in sane situations
        return setTimeout(fun, 0);
    }
    // if setTimeout wasn't available but was latter defined
    if ((cachedSetTimeout === defaultSetTimout || !cachedSetTimeout) && setTimeout) {
        cachedSetTimeout = setTimeout;
        return setTimeout(fun, 0);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedSetTimeout(fun, 0);
    } catch(e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't trust the global object when called normally
            return cachedSetTimeout.call(null, fun, 0);
        } catch(e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error
            return cachedSetTimeout.call(this, fun, 0);
        }
    }


}
function runClearTimeout(marker) {
    if (cachedClearTimeout === clearTimeout) {
        //normal enviroments in sane situations
        return clearTimeout(marker);
    }
    // if clearTimeout wasn't available but was latter defined
    if ((cachedClearTimeout === defaultClearTimeout || !cachedClearTimeout) && clearTimeout) {
        cachedClearTimeout = clearTimeout;
        return clearTimeout(marker);
    }
    try {
        // when when somebody has screwed with setTimeout but no I.E. maddness
        return cachedClearTimeout(marker);
    } catch (e){
        try {
            // When we are in I.E. but the script has been evaled so I.E. doesn't  trust the global object when called normally
            return cachedClearTimeout.call(null, marker);
        } catch (e){
            // same as above but when it's a version of I.E. that must have the global object for 'this', hopfully our context correct otherwise it will throw a global error.
            // Some versions of I.E. have different rules for clearTimeout vs setTimeout
            return cachedClearTimeout.call(this, marker);
        }
    }



}
var queue = [];
var draining = false;
var currentQueue;
var queueIndex = -1;

function cleanUpNextTick() {
    if (!draining || !currentQueue) {
        return;
    }
    draining = false;
    if (currentQueue.length) {
        queue = currentQueue.concat(queue);
    } else {
        queueIndex = -1;
    }
    if (queue.length) {
        drainQueue();
    }
}

function drainQueue() {
    if (draining) {
        return;
    }
    var timeout = runTimeout(cleanUpNextTick);
    draining = true;

    var len = queue.length;
    while(len) {
        currentQueue = queue;
        queue = [];
        while (++queueIndex < len) {
            if (currentQueue) {
                currentQueue[queueIndex].run();
            }
        }
        queueIndex = -1;
        len = queue.length;
    }
    currentQueue = null;
    draining = false;
    runClearTimeout(timeout);
}

process.nextTick = function (fun) {
    var args = new Array(arguments.length - 1);
    if (arguments.length > 1) {
        for (var i = 1; i < arguments.length; i++) {
            args[i - 1] = arguments[i];
        }
    }
    queue.push(new Item(fun, args));
    if (queue.length === 1 && !draining) {
        runTimeout(drainQueue);
    }
};

// v8 likes predictible objects
function Item(fun, array) {
    this.fun = fun;
    this.array = array;
}
Item.prototype.run = function () {
    this.fun.apply(null, this.array);
};
process.title = 'browser';
process.browser = true;
process.env = {};
process.argv = [];
process.version = ''; // empty string to avoid regexp issues
process.versions = {};

function noop() {}

process.on = noop;
process.addListener = noop;
process.once = noop;
process.off = noop;
process.removeListener = noop;
process.removeAllListeners = noop;
process.emit = noop;

process.binding = function (name) {
    throw new Error('process.binding is not supported');
};

process.cwd = function () { return '/' };
process.chdir = function (dir) {
    throw new Error('process.chdir is not supported');
};
process.umask = function() { return 0; };

},{}],12:[function(require,module,exports){
var EventEmitter = require('events').EventEmitter
var backoff = require('backoff')

module.exports =
function (createConnection) {
  return function (opts, onConnect) {
    onConnect = 'function' == typeof opts ? opts : onConnect
    opts = 'object' == typeof opts ? opts : {initialDelay: 1e3, maxDelay: 30e3}
    if(!onConnect)
      onConnect = opts.onConnect

    var emitter = new EventEmitter()
    emitter.connected = false
    emitter.reconnect = true

    if(onConnect)
      //use "connection" to match core (net) api.
      emitter.on('connection', onConnect)

    var backoffStrategy = opts.strategy || opts.type
    var backoffMethod
    if (typeof backoffStrategy == 'string')
      backoffMethod = backoff[backoffStrategy](opts)
    else
      backoffMethod = backoffStrategy || backoff.fibonacci(opts)

    if(opts.failAfter)
      backoffMethod.failAfter(opts.failAfter);

    backoffMethod.on('backoff', function (n, d, e) {
      emitter.emit('backoff', n, d, e)
    })
    backoffMethod.on('fail', function (e) {
      emitter.disconnect()
      emitter.emit('fail', e)
    })

    var args
    function attempt (n, delay) {
      if(emitter.connected) return
      if(!emitter.reconnect) return

      emitter.emit('reconnect', n, delay)
      var con = createConnection.apply(emitter, args)
      emitter._connection = con

      function onError (err) {
        con.removeListener('error', onError)
        emitter.emit('error', err)
        onDisconnect(err)
      }

      function onDisconnect (err) {
        emitter.connected = false
        con.removeListener('close', onDisconnect)
        con.removeListener('end'  , onDisconnect)

        //hack to make http not crash.
        //HTTP IS THE WORST PROTOCOL.
        if(con.constructor.name == 'Request')
          con.on('error', function () {})

        //emit disconnect before checking reconnect, so user has a chance to decide not to.
        emitter.emit('disconnect', err)

        if(!emitter.reconnect) return
        try { backoffMethod.backoff() } catch (_) { }
      }

      con
        .on('error', onError)
        .on('close', onDisconnect)
        .on('end'  , onDisconnect)

      if(opts.immediate || con.constructor.name == 'Request') {
        emitter.connected = true
        emitter.emit('connect', con)
        emitter.emit('connection', con)
        con.once('data', function () {
          //this is the only way to know for sure that data is coming...
          backoffMethod.reset()
        })
      } else {
        con
          .once('connect', function () {
            backoffMethod.reset()
            emitter.connected = true
            if(onConnect)
              con.removeListener('connect', onConnect)
            emitter.emit('connect', con)
            //also support net style 'connection' method.
            emitter.emit('connection', con)
          })
      }
    }

    emitter.connect =
    emitter.listen = function () {
      this.reconnect = true
      if(emitter.connected) return
      backoffMethod.reset()
      backoffMethod.on('ready', attempt)
      if (!args) {
        var len = arguments.length;
        args = new Array(len);
        for (var i = 0; i < len; i++) {
          args[i] = arguments[i];
        }
      }
      attempt(0, 0)
      return emitter
    }

    //force reconnection

    emitter.disconnect = function () {
      this.reconnect = false

      if(emitter._connection)
        emitter._connection.end()

      return emitter
    }

    emitter.reset = function () {
      backoffMethod.reset()
      attempt(0, 0)
    }

    return emitter
  }

}

},{"backoff":1,"events":7}],13:[function(require,module,exports){
if (typeof Object.create === 'function') {
  // implementation from standard node.js 'util' module
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    ctor.prototype = Object.create(superCtor.prototype, {
      constructor: {
        value: ctor,
        enumerable: false,
        writable: true,
        configurable: true
      }
    });
  };
} else {
  // old school shim for old browsers
  module.exports = function inherits(ctor, superCtor) {
    ctor.super_ = superCtor
    var TempCtor = function () {}
    TempCtor.prototype = superCtor.prototype
    ctor.prototype = new TempCtor()
    ctor.prototype.constructor = ctor
  }
}

},{}],14:[function(require,module,exports){
module.exports = function isBuffer(arg) {
  return arg && typeof arg === 'object'
    && typeof arg.copy === 'function'
    && typeof arg.fill === 'function'
    && typeof arg.readUInt8 === 'function';
}
},{}],15:[function(require,module,exports){
(function (process,global){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

var formatRegExp = /%[sdj%]/g;
exports.format = function(f) {
  if (!isString(f)) {
    var objects = [];
    for (var i = 0; i < arguments.length; i++) {
      objects.push(inspect(arguments[i]));
    }
    return objects.join(' ');
  }

  var i = 1;
  var args = arguments;
  var len = args.length;
  var str = String(f).replace(formatRegExp, function(x) {
    if (x === '%%') return '%';
    if (i >= len) return x;
    switch (x) {
      case '%s': return String(args[i++]);
      case '%d': return Number(args[i++]);
      case '%j':
        try {
          return JSON.stringify(args[i++]);
        } catch (_) {
          return '[Circular]';
        }
      default:
        return x;
    }
  });
  for (var x = args[i]; i < len; x = args[++i]) {
    if (isNull(x) || !isObject(x)) {
      str += ' ' + x;
    } else {
      str += ' ' + inspect(x);
    }
  }
  return str;
};


// Mark that a method should not be used.
// Returns a modified function which warns once by default.
// If --no-deprecation is set, then it is a no-op.
exports.deprecate = function(fn, msg) {
  // Allow for deprecating things in the process of starting up.
  if (isUndefined(global.process)) {
    return function() {
      return exports.deprecate(fn, msg).apply(this, arguments);
    };
  }

  if (process.noDeprecation === true) {
    return fn;
  }

  var warned = false;
  function deprecated() {
    if (!warned) {
      if (process.throwDeprecation) {
        throw new Error(msg);
      } else if (process.traceDeprecation) {
        console.trace(msg);
      } else {
        console.error(msg);
      }
      warned = true;
    }
    return fn.apply(this, arguments);
  }

  return deprecated;
};


var debugs = {};
var debugEnviron;
exports.debuglog = function(set) {
  if (isUndefined(debugEnviron))
    debugEnviron = process.env.NODE_DEBUG || '';
  set = set.toUpperCase();
  if (!debugs[set]) {
    if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
      var pid = process.pid;
      debugs[set] = function() {
        var msg = exports.format.apply(exports, arguments);
        console.error('%s %d: %s', set, pid, msg);
      };
    } else {
      debugs[set] = function() {};
    }
  }
  return debugs[set];
};


/**
 * Echos the value of a value. Trys to print the value out
 * in the best way possible given the different types.
 *
 * @param {Object} obj The object to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* legacy: obj, showHidden, depth, colors*/
function inspect(obj, opts) {
  // default options
  var ctx = {
    seen: [],
    stylize: stylizeNoColor
  };
  // legacy...
  if (arguments.length >= 3) ctx.depth = arguments[2];
  if (arguments.length >= 4) ctx.colors = arguments[3];
  if (isBoolean(opts)) {
    // legacy...
    ctx.showHidden = opts;
  } else if (opts) {
    // got an "options" object
    exports._extend(ctx, opts);
  }
  // set default options
  if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  if (isUndefined(ctx.depth)) ctx.depth = 2;
  if (isUndefined(ctx.colors)) ctx.colors = false;
  if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  return formatValue(ctx, obj, ctx.depth);
}
exports.inspect = inspect;


// http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
inspect.colors = {
  'bold' : [1, 22],
  'italic' : [3, 23],
  'underline' : [4, 24],
  'inverse' : [7, 27],
  'white' : [37, 39],
  'grey' : [90, 39],
  'black' : [30, 39],
  'blue' : [34, 39],
  'cyan' : [36, 39],
  'green' : [32, 39],
  'magenta' : [35, 39],
  'red' : [31, 39],
  'yellow' : [33, 39]
};

// Don't use 'blue' not visible on cmd.exe
inspect.styles = {
  'special': 'cyan',
  'number': 'yellow',
  'boolean': 'yellow',
  'undefined': 'grey',
  'null': 'bold',
  'string': 'green',
  'date': 'magenta',
  // "name": intentionally not styling
  'regexp': 'red'
};


function stylizeWithColor(str, styleType) {
  var style = inspect.styles[styleType];

  if (style) {
    return '\u001b[' + inspect.colors[style][0] + 'm' + str +
           '\u001b[' + inspect.colors[style][1] + 'm';
  } else {
    return str;
  }
}


function stylizeNoColor(str, styleType) {
  return str;
}


function arrayToHash(array) {
  var hash = {};

  array.forEach(function(val, idx) {
    hash[val] = true;
  });

  return hash;
}


function formatValue(ctx, value, recurseTimes) {
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it
  if (ctx.customInspect &&
      value &&
      isFunction(value.inspect) &&
      // Filter out the util module, it's inspect function is special
      value.inspect !== exports.inspect &&
      // Also filter out any prototype objects using the circular check.
      !(value.constructor && value.constructor.prototype === value)) {
    var ret = value.inspect(recurseTimes, ctx);
    if (!isString(ret)) {
      ret = formatValue(ctx, ret, recurseTimes);
    }
    return ret;
  }

  // Primitive types cannot have properties
  var primitive = formatPrimitive(ctx, value);
  if (primitive) {
    return primitive;
  }

  // Look up the keys of the object.
  var keys = Object.keys(value);
  var visibleKeys = arrayToHash(keys);

  if (ctx.showHidden) {
    keys = Object.getOwnPropertyNames(value);
  }

  // IE doesn't make error fields non-enumerable
  // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  if (isError(value)
      && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
    return formatError(value);
  }

  // Some type of object without properties can be shortcutted.
  if (keys.length === 0) {
    if (isFunction(value)) {
      var name = value.name ? ': ' + value.name : '';
      return ctx.stylize('[Function' + name + ']', 'special');
    }
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    }
    if (isDate(value)) {
      return ctx.stylize(Date.prototype.toString.call(value), 'date');
    }
    if (isError(value)) {
      return formatError(value);
    }
  }

  var base = '', array = false, braces = ['{', '}'];

  // Make Array say that they are Array
  if (isArray(value)) {
    array = true;
    braces = ['[', ']'];
  }

  // Make functions say that they are functions
  if (isFunction(value)) {
    var n = value.name ? ': ' + value.name : '';
    base = ' [Function' + n + ']';
  }

  // Make RegExps say that they are RegExps
  if (isRegExp(value)) {
    base = ' ' + RegExp.prototype.toString.call(value);
  }

  // Make dates with properties first say the date
  if (isDate(value)) {
    base = ' ' + Date.prototype.toUTCString.call(value);
  }

  // Make error with message first say the error
  if (isError(value)) {
    base = ' ' + formatError(value);
  }

  if (keys.length === 0 && (!array || value.length == 0)) {
    return braces[0] + base + braces[1];
  }

  if (recurseTimes < 0) {
    if (isRegExp(value)) {
      return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
    } else {
      return ctx.stylize('[Object]', 'special');
    }
  }

  ctx.seen.push(value);

  var output;
  if (array) {
    output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  } else {
    output = keys.map(function(key) {
      return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
    });
  }

  ctx.seen.pop();

  return reduceToSingleString(output, base, braces);
}


function formatPrimitive(ctx, value) {
  if (isUndefined(value))
    return ctx.stylize('undefined', 'undefined');
  if (isString(value)) {
    var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
                                             .replace(/'/g, "\\'")
                                             .replace(/\\"/g, '"') + '\'';
    return ctx.stylize(simple, 'string');
  }
  if (isNumber(value))
    return ctx.stylize('' + value, 'number');
  if (isBoolean(value))
    return ctx.stylize('' + value, 'boolean');
  // For some reason typeof null is "object", so special case here.
  if (isNull(value))
    return ctx.stylize('null', 'null');
}


function formatError(value) {
  return '[' + Error.prototype.toString.call(value) + ']';
}


function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  var output = [];
  for (var i = 0, l = value.length; i < l; ++i) {
    if (hasOwnProperty(value, String(i))) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          String(i), true));
    } else {
      output.push('');
    }
  }
  keys.forEach(function(key) {
    if (!key.match(/^\d+$/)) {
      output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
          key, true));
    }
  });
  return output;
}


function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  var name, str, desc;
  desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  if (desc.get) {
    if (desc.set) {
      str = ctx.stylize('[Getter/Setter]', 'special');
    } else {
      str = ctx.stylize('[Getter]', 'special');
    }
  } else {
    if (desc.set) {
      str = ctx.stylize('[Setter]', 'special');
    }
  }
  if (!hasOwnProperty(visibleKeys, key)) {
    name = '[' + key + ']';
  }
  if (!str) {
    if (ctx.seen.indexOf(desc.value) < 0) {
      if (isNull(recurseTimes)) {
        str = formatValue(ctx, desc.value, null);
      } else {
        str = formatValue(ctx, desc.value, recurseTimes - 1);
      }
      if (str.indexOf('\n') > -1) {
        if (array) {
          str = str.split('\n').map(function(line) {
            return '  ' + line;
          }).join('\n').substr(2);
        } else {
          str = '\n' + str.split('\n').map(function(line) {
            return '   ' + line;
          }).join('\n');
        }
      }
    } else {
      str = ctx.stylize('[Circular]', 'special');
    }
  }
  if (isUndefined(name)) {
    if (array && key.match(/^\d+$/)) {
      return str;
    }
    name = JSON.stringify('' + key);
    if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
      name = name.substr(1, name.length - 2);
      name = ctx.stylize(name, 'name');
    } else {
      name = name.replace(/'/g, "\\'")
                 .replace(/\\"/g, '"')
                 .replace(/(^"|"$)/g, "'");
      name = ctx.stylize(name, 'string');
    }
  }

  return name + ': ' + str;
}


function reduceToSingleString(output, base, braces) {
  var numLinesEst = 0;
  var length = output.reduce(function(prev, cur) {
    numLinesEst++;
    if (cur.indexOf('\n') >= 0) numLinesEst++;
    return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  }, 0);

  if (length > 60) {
    return braces[0] +
           (base === '' ? '' : base + '\n ') +
           ' ' +
           output.join(',\n  ') +
           ' ' +
           braces[1];
  }

  return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
}


// NOTE: These type checking functions intentionally don't use `instanceof`
// because it is fragile and can be easily faked with `Object.create()`.
function isArray(ar) {
  return Array.isArray(ar);
}
exports.isArray = isArray;

function isBoolean(arg) {
  return typeof arg === 'boolean';
}
exports.isBoolean = isBoolean;

function isNull(arg) {
  return arg === null;
}
exports.isNull = isNull;

function isNullOrUndefined(arg) {
  return arg == null;
}
exports.isNullOrUndefined = isNullOrUndefined;

function isNumber(arg) {
  return typeof arg === 'number';
}
exports.isNumber = isNumber;

function isString(arg) {
  return typeof arg === 'string';
}
exports.isString = isString;

function isSymbol(arg) {
  return typeof arg === 'symbol';
}
exports.isSymbol = isSymbol;

function isUndefined(arg) {
  return arg === void 0;
}
exports.isUndefined = isUndefined;

function isRegExp(re) {
  return isObject(re) && objectToString(re) === '[object RegExp]';
}
exports.isRegExp = isRegExp;

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}
exports.isObject = isObject;

function isDate(d) {
  return isObject(d) && objectToString(d) === '[object Date]';
}
exports.isDate = isDate;

function isError(e) {
  return isObject(e) &&
      (objectToString(e) === '[object Error]' || e instanceof Error);
}
exports.isError = isError;

function isFunction(arg) {
  return typeof arg === 'function';
}
exports.isFunction = isFunction;

function isPrimitive(arg) {
  return arg === null ||
         typeof arg === 'boolean' ||
         typeof arg === 'number' ||
         typeof arg === 'string' ||
         typeof arg === 'symbol' ||  // ES6 symbol
         typeof arg === 'undefined';
}
exports.isPrimitive = isPrimitive;

exports.isBuffer = require('./support/isBuffer');

function objectToString(o) {
  return Object.prototype.toString.call(o);
}


function pad(n) {
  return n < 10 ? '0' + n.toString(10) : n.toString(10);
}


var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
              'Oct', 'Nov', 'Dec'];

// 26 Feb 16:19:34
function timestamp() {
  var d = new Date();
  var time = [pad(d.getHours()),
              pad(d.getMinutes()),
              pad(d.getSeconds())].join(':');
  return [d.getDate(), months[d.getMonth()], time].join(' ');
}


// log is just a thin wrapper to console.log that prepends a timestamp
exports.log = function() {
  console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
};


/**
 * Inherit the prototype methods from one constructor into another.
 *
 * The Function.prototype.inherits from lang.js rewritten as a standalone
 * function (not on Function.prototype). NOTE: If this file is to be loaded
 * during bootstrapping this function needs to be rewritten using some native
 * functions as prototype setup using normal JavaScript does not work as
 * expected during bootstrapping (see mirror.js in r114903).
 *
 * @param {function} ctor Constructor function which needs to inherit the
 *     prototype.
 * @param {function} superCtor Constructor function to inherit prototype from.
 */
exports.inherits = require('inherits');

exports._extend = function(origin, add) {
  // Don't do anything if add isn't an object
  if (!add || !isObject(add)) return origin;

  var keys = Object.keys(add);
  var i = keys.length;
  while (i--) {
    origin[keys[i]] = add[keys[i]];
  }
  return origin;
};

function hasOwnProperty(obj, prop) {
  return Object.prototype.hasOwnProperty.call(obj, prop);
}

}).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{"./support/isBuffer":14,"_process":11,"inherits":13}],"/src/webresock":[function(require,module,exports){
/* global WebSocket */

const adaptEventName = (eventName) => eventName === 'connect' ? 'open' : eventName
const adapt = (f, connection) => (eventName, ...args) => (f(adaptEventName(eventName), ...args) || true) && connection

module.exports = {
  reconnect: require('reconnect-core')((...args) => {
    const ws = new WebSocket(...args)
    const wsOnce = (eventName, listener) => ws.addEventListener(eventName, function onceListener (...args) {
      ws.removeEventListener(eventName, onceListener)
      listener(...args)
    })
    const connection = {}
    connection.on = adapt(ws.addEventListener.bind(ws), connection)
    connection.once = adapt(wsOnce, connection)
    connection.removeListener = adapt(ws.removeEventListener.bind(ws), connection)
    connection.send = ws.send.bind(ws)
    return connection
  }),
  backoff: require('backoff')
}

},{"backoff":1,"reconnect-core":12}]},{},[])("/src/webresock")
});