1 files changed, 475 insertions, 0 deletions
diff --git a/actioncable/app/assets/javascripts/action_cable.js b/actioncable/app/assets/javascripts/action_cable.js
new file mode 100644
index 0000000000..df60b1fc24
--- /dev/null
+++ b/actioncable/app/assets/javascripts/action_cable.js
@@ -0,0 +1,475 @@
+(function(global, factory) {
+  typeof exports === "object" && typeof module !== "undefined" ? module.exports = factory() : typeof define === "function" && define.amd ? define(factory) : global.ActionCable = factory();
+})(this, function() {
+  "use strict";
+  var INTERNAL = {
+    message_types: {
+      welcome: "welcome",
+      ping: "ping",
+      confirmation: "confirm_subscription",
+      rejection: "reject_subscription"
+    },
+    default_mount_path: "/cable",
+    protocols: [ "actioncable-v1-json", "actioncable-unsupported" ]
+  };
+  var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function(obj) {
+    return typeof obj;
+  } : function(obj) {
+    return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+  };
+  var classCallCheck = function(instance, Constructor) {
+    if (!(instance instanceof Constructor)) {
+      throw new TypeError("Cannot call a class as a function");
+    }
+  };
+  var message_types = INTERNAL.message_types, protocols = INTERNAL.protocols;
+  var supportedProtocols = protocols.slice(0, protocols.length - 1);
+  var indexOf = [].indexOf;
+  var Connection = function() {
+    function Connection(consumer) {
+      classCallCheck(this, Connection);
+      this.open = this.open.bind(this);
+      this.consumer = consumer;
+      this.subscriptions = this.consumer.subscriptions;
+      this.monitor = new ActionCable.ConnectionMonitor(this);
+      this.disconnected = true;
+    }
+    Connection.prototype.send = function send(data) {
+      if (this.isOpen()) {
+        this.webSocket.send(JSON.stringify(data));
+        return true;
+      } else {
+        return false;
+      }
+    };
+    Connection.prototype.open = function open() {
+      if (this.isActive()) {
+        ActionCable.log("Attempted to open WebSocket, but existing socket is " + this.getState());
+        return false;
+      } else {
+        ActionCable.log("Opening WebSocket, current state is " + this.getState() + ", subprotocols: " + protocols);
+        if (this.webSocket) {
+          this.uninstallEventHandlers();
+        }
+        this.webSocket = new ActionCable.WebSocket(this.consumer.url, protocols);
+        this.installEventHandlers();
+        this.monitor.start();
+        return true;
+      }
+    };
+    Connection.prototype.close = function close() {
+      var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {
+        allowReconnect: true
+      }, allowReconnect = _ref.allowReconnect;
+      if (!allowReconnect) {
+        this.monitor.stop();
+      }
+      if (this.isActive()) {
+        return this.webSocket ? this.webSocket.close() : undefined;
+      }
+    };
+    Connection.prototype.reopen = function reopen() {
+      ActionCable.log("Reopening WebSocket, current state is " + this.getState());
+      if (this.isActive()) {
+        try {
+          return this.close();
+        } catch (error) {
+          ActionCable.log("Failed to reopen WebSocket", error);
+        } finally {
+          ActionCable.log("Reopening WebSocket in " + this.constructor.reopenDelay + "ms");
+          setTimeout(this.open, this.constructor.reopenDelay);
+        }
+      } else {
+        return this.open();
+      }
+    };
+    Connection.prototype.getProtocol = function getProtocol() {
+      return this.webSocket ? this.webSocket.protocol : undefined;
+    };
+    Connection.prototype.isOpen = function isOpen() {
+      return this.isState("open");
+    };
+    Connection.prototype.isActive = function isActive() {
+      return this.isState("open", "connecting");
+    };
+    Connection.prototype.isProtocolSupported = function isProtocolSupported() {
+      return indexOf.call(supportedProtocols, this.getProtocol()) >= 0;
+    };
+    Connection.prototype.isState = function isState() {
+      for (var _len = arguments.length, states = Array(_len), _key = 0; _key < _len; _key++) {
+        states[_key] = arguments[_key];
+      }
+      return indexOf.call(states, this.getState()) >= 0;
+    };
+    Connection.prototype.getState = function getState() {
+      if (this.webSocket) {
+        for (var state in WebSocket) {
+          if (WebSocket[state] === this.webSocket.readyState) {
+            return state.toLowerCase();
+          }
+        }
+      }
+      return null;
+    };
+    Connection.prototype.installEventHandlers = function installEventHandlers() {
+      for (var eventName in this.events) {
+        var handler = this.events[eventName].bind(this);
+        this.webSocket["on" + eventName] = handler;
+      }
+    };
+    Connection.prototype.uninstallEventHandlers = function uninstallEventHandlers() {
+      for (var eventName in this.events) {
+        this.webSocket["on" + eventName] = function() {};
+      }
+    };
+    return Connection;
+  }();
+  Connection.reopenDelay = 500;
+  Connection.prototype.events = {
+    message: function message(event) {
+      if (!this.isProtocolSupported()) {
+        return;
+      }
+      var _JSON$parse = JSON.parse(event.data), identifier = _JSON$parse.identifier, message = _JSON$parse.message, type = _JSON$parse.type;
+      switch (type) {
+       case message_types.welcome:
+        this.monitor.recordConnect();
+        return this.subscriptions.reload();
+
+       case message_types.ping:
+        return this.monitor.recordPing();
+
+       case message_types.confirmation:
+        return this.subscriptions.notify(identifier, "connected");
+
+       case message_types.rejection:
+        return this.subscriptions.reject(identifier);
+
+       default:
+        return this.subscriptions.notify(identifier, "received", message);
+      }
+    },
+    open: function open() {
+      ActionCable.log("WebSocket onopen event, using '" + this.getProtocol() + "' subprotocol");
+      this.disconnected = false;
+      if (!this.isProtocolSupported()) {
+        ActionCable.log("Protocol is unsupported. Stopping monitor and disconnecting.");
+        return this.close({
+          allowReconnect: false
+        });
+      }
+    },
+    close: function close(event) {
+      ActionCable.log("WebSocket onclose event");
+      if (this.disconnected) {
+        return;
+      }
+      this.disconnected = true;
+      this.monitor.recordDisconnect();
+      return this.subscriptions.notifyAll("disconnected", {
+        willAttemptReconnect: this.monitor.isRunning()
+      });
+    },
+    error: function error() {
+      ActionCable.log("WebSocket onerror event");
+    }
+  };
+  var now = function now() {
+    return new Date().getTime();
+  };
+  var secondsSince = function secondsSince(time) {
+    return (now() - time) / 1e3;
+  };
+  var clamp = function clamp(number, min, max) {
+    return Math.max(min, Math.min(max, number));
+  };
+  var ConnectionMonitor = function() {
+    function ConnectionMonitor(connection) {
+      classCallCheck(this, ConnectionMonitor);
+      this.visibilityDidChange = this.visibilityDidChange.bind(this);
+      this.connection = connection;
+      this.reconnectAttempts = 0;
+    }
+    ConnectionMonitor.prototype.start = function start() {
+      if (!this.isRunning()) {
+        this.startedAt = now();
+        delete this.stoppedAt;
+        this.startPolling();
+        document.addEventListener("visibilitychange", this.visibilityDidChange);
+        ActionCable.log("ConnectionMonitor started. pollInterval = " + this.getPollInterval() + " ms");
+      }
+    };
+    ConnectionMonitor.prototype.stop = function stop() {
+      if (this.isRunning()) {
+        this.stoppedAt = now();
+        this.stopPolling();
+        document.removeEventListener("visibilitychange", this.visibilityDidChange);
+        ActionCable.log("ConnectionMonitor stopped");
+      }
+    };
+    ConnectionMonitor.prototype.isRunning = function isRunning() {
+      return this.startedAt && !this.stoppedAt;
+    };
+    ConnectionMonitor.prototype.recordPing = function recordPing() {
+      this.pingedAt = now();
+    };
+    ConnectionMonitor.prototype.recordConnect = function recordConnect() {
+      this.reconnectAttempts = 0;
+      this.recordPing();
+      delete this.disconnectedAt;
+      ActionCable.log("ConnectionMonitor recorded connect");
+    };
+    ConnectionMonitor.prototype.recordDisconnect = function recordDisconnect() {
+      this.disconnectedAt = now();
+      ActionCable.log("ConnectionMonitor recorded disconnect");
+    };
+    ConnectionMonitor.prototype.startPolling = function startPolling() {
+      this.stopPolling();
+      this.poll();
+    };
+    ConnectionMonitor.prototype.stopPolling = function stopPolling() {
+      clearTimeout(this.pollTimeout);
+    };
+    ConnectionMonitor.prototype.poll = function poll() {
+      var _this = this;
+      this.pollTimeout = setTimeout(function() {
+        _this.reconnectIfStale();
+        _this.poll();
+      }, this.getPollInterval());
+    };
+    ConnectionMonitor.prototype.getPollInterval = function getPollInterval() {
+      var _constructor$pollInte = this.constructor.pollInterval, min = _constructor$pollInte.min, max = _constructor$pollInte.max;
+      var interval = 5 * Math.log(this.reconnectAttempts + 1);
+      return Math.round(clamp(interval, min, max) * 1e3);
+    };
+    ConnectionMonitor.prototype.reconnectIfStale = function reconnectIfStale() {
+      if (this.connectionIsStale()) {
+        ActionCable.log("ConnectionMonitor detected stale connection. reconnectAttempts = " + this.reconnectAttempts + ", pollInterval = " + this.getPollInterval() + " ms, time disconnected = " + secondsSince(this.disconnectedAt) + " s, stale threshold = " + this.constructor.staleThreshold + " s");
+        this.reconnectAttempts++;
+        if (this.disconnectedRecently()) {
+          ActionCable.log("ConnectionMonitor skipping reopening recent disconnect");
+        } else {
+          ActionCable.log("ConnectionMonitor reopening");
+          this.connection.reopen();
+        }
+      }
+    };
+    ConnectionMonitor.prototype.connectionIsStale = function connectionIsStale() {
+      return secondsSince(this.pingedAt ? this.pingedAt : this.startedAt) > this.constructor.staleThreshold;
+    };
+    ConnectionMonitor.prototype.disconnectedRecently = function disconnectedRecently() {
+      return this.disconnectedAt && secondsSince(this.disconnectedAt) < this.constructor.staleThreshold;
+    };
+    ConnectionMonitor.prototype.visibilityDidChange = function visibilityDidChange() {
+      var _this2 = this;
+      if (document.visibilityState === "visible") {
+        setTimeout(function() {
+          if (_this2.connectionIsStale() || !_this2.connection.isOpen()) {
+            ActionCable.log("ConnectionMonitor reopening stale connection on visibilitychange. visbilityState = " + document.visibilityState);
+            _this2.connection.reopen();
+          }
+        }, 200);
+      }
+    };
+    return ConnectionMonitor;
+  }();
+  ConnectionMonitor.pollInterval = {
+    min: 3,
+    max: 30
+  };
+  ConnectionMonitor.staleThreshold = 6;
+  var Consumer = function() {
+    function Consumer(url) {
+      classCallCheck(this, Consumer);
+      this.url = url;
+      this.subscriptions = new ActionCable.Subscriptions(this);
+      this.connection = new ActionCable.Connection(this);
+    }
+    Consumer.prototype.send = function send(data) {
+      return this.connection.send(data);
+    };
+    Consumer.prototype.connect = function connect() {
+      return this.connection.open();
+    };
+    Consumer.prototype.disconnect = function disconnect() {
+      return this.connection.close({
+        allowReconnect: false
+      });
+    };
+    Consumer.prototype.ensureActiveConnection = function ensureActiveConnection() {
+      if (!this.connection.isActive()) {
+        return this.connection.open();
+      }
+    };
+    return Consumer;
+  }();
+  var extend = function extend(object, properties) {
+    if (properties != null) {
+      for (var key in properties) {
+        var value = properties[key];
+        object[key] = value;
+      }
+    }
+    return object;
+  };
+  var Subscription = function() {
+    function Subscription(consumer) {
+      var params = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+      var mixin = arguments[2];
+      classCallCheck(this, Subscription);
+      this.consumer = consumer;
+      this.identifier = JSON.stringify(params);
+      extend(this, mixin);
+    }
+    Subscription.prototype.perform = function perform(action) {
+      var data = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+      data.action = action;
+      return this.send(data);
+    };
+    Subscription.prototype.send = function send(data) {
+      return this.consumer.send({
+        command: "message",
+        identifier: this.identifier,
+        data: JSON.stringify(data)
+      });
+    };
+    Subscription.prototype.unsubscribe = function unsubscribe() {
+      return this.consumer.subscriptions.remove(this);
+    };
+    return Subscription;
+  }();
+  var Subscriptions = function() {
+    function Subscriptions(consumer) {
+      classCallCheck(this, Subscriptions);
+      this.consumer = consumer;
+      this.subscriptions = [];
+    }
+    Subscriptions.prototype.create = function create(channelName, mixin) {
+      var channel = channelName;
+      var params = (typeof channel === "undefined" ? "undefined" : _typeof(channel)) === "object" ? channel : {
+        channel: channel
+      };
+      var subscription = new ActionCable.Subscription(this.consumer, params, mixin);
+      return this.add(subscription);
+    };
+    Subscriptions.prototype.add = function add(subscription) {
+      this.subscriptions.push(subscription);
+      this.consumer.ensureActiveConnection();
+      this.notify(subscription, "initialized");
+      this.sendCommand(subscription, "subscribe");
+      return subscription;
+    };
+    Subscriptions.prototype.remove = function remove(subscription) {
+      this.forget(subscription);
+      if (!this.findAll(subscription.identifier).length) {
+        this.sendCommand(subscription, "unsubscribe");
+      }
+      return subscription;
+    };
+    Subscriptions.prototype.reject = function reject(identifier) {
+      var _this = this;
+      return this.findAll(identifier).map(function(subscription) {
+        _this.forget(subscription);
+        _this.notify(subscription, "rejected");
+        return subscription;
+      });
+    };
+    Subscriptions.prototype.forget = function forget(subscription) {
+      this.subscriptions = this.subscriptions.filter(function(s) {
+        return s !== subscription;
+      });
+      return subscription;
+    };
+    Subscriptions.prototype.findAll = function findAll(identifier) {
+      return this.subscriptions.filter(function(s) {
+        return s.identifier === identifier;
+      });
+    };
+    Subscriptions.prototype.reload = function reload() {
+      var _this2 = this;
+      return this.subscriptions.map(function(subscription) {
+        return _this2.sendCommand(subscription, "subscribe");
+      });
+    };
+    Subscriptions.prototype.notifyAll = function notifyAll(callbackName) {
+      var _this3 = this;
+      for (var _len = arguments.length, args = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+        args[_key - 1] = arguments[_key];
+      }
+      return this.subscriptions.map(function(subscription) {
+        return _this3.notify.apply(_this3, [ subscription, callbackName ].concat(args));
+      });
+    };
+    Subscriptions.prototype.notify = function notify(subscription, callbackName) {
+      for (var _len2 = arguments.length, args = Array(_len2 > 2 ? _len2 - 2 : 0), _key2 = 2; _key2 < _len2; _key2++) {
+        args[_key2 - 2] = arguments[_key2];
+      }
+      var subscriptions = void 0;
+      if (typeof subscription === "string") {
+        subscriptions = this.findAll(subscription);
+      } else {
+        subscriptions = [ subscription ];
+      }
+      return subscriptions.map(function(subscription) {
+        return typeof subscription[callbackName] === "function" ? subscription[callbackName].apply(subscription, args) : undefined;
+      });
+    };
+    Subscriptions.prototype.sendCommand = function sendCommand(subscription, command) {
+      var identifier = subscription.identifier;
+      return this.consumer.send({
+        command: command,
+        identifier: identifier
+      });
+    };
+    return Subscriptions;
+  }();
+  var ActionCable = {
+    Connection: Connection,
+    ConnectionMonitor: ConnectionMonitor,
+    Consumer: Consumer,
+    INTERNAL: INTERNAL,
+    Subscription: Subscription,
+    Subscriptions: Subscriptions,
+    WebSocket: window.WebSocket,
+    logger: window.console,
+    createConsumer: function createConsumer(url) {
+      if (url == null) {
+        var urlConfig = this.getConfig("url");
+        url = urlConfig ? urlConfig : this.INTERNAL.default_mount_path;
+      }
+      return new Consumer(this.createWebSocketURL(url));
+    },
+    getConfig: function getConfig(name) {
+      var element = document.head.querySelector("meta[name='action-cable-" + name + "']");
+      return element ? element.getAttribute("content") : undefined;
+    },
+    createWebSocketURL: function createWebSocketURL(url) {
+      if (url && !/^wss?:/i.test(url)) {
+        var a = document.createElement("a");
+        a.href = url;
+        a.href = a.href;
+        a.protocol = a.protocol.replace("http", "ws");
+        return a.href;
+      } else {
+        return url;
+      }
+    },
+    startDebugging: function startDebugging() {
+      this.debugging = true;
+    },
+    stopDebugging: function stopDebugging() {
+      this.debugging = null;
+    },
+    log: function log() {
+      if (this.debugging) {
+        var _logger;
+        for (var _len = arguments.length, messages = Array(_len), _key = 0; _key < _len; _key++) {
+          messages[_key] = arguments[_key];
+        }
+        messages.push(Date.now());
+        (_logger = this.logger).log.apply(_logger, [ "[ActionCable]" ].concat(messages));
+      }
+    }
+  };
+  return ActionCable;
+});