(function(global, factory) { typeof exports === "object" && typeof module !== "undefined" ? factory(exports) : typeof define === "function" && define.amd ? define([ "exports" ], factory) : (global = typeof globalThis !== "undefined" ? globalThis : global || self, factory(global.ActionCable = {})); })(this, (function(exports) { "use strict"; var adapters = { logger: self.console, WebSocket: self.WebSocket }; var logger = { log(...messages) { if (this.enabled) { messages.push(Date.now()); adapters.logger.log("[ActionCable]", ...messages); } } }; const now = () => (new Date).getTime(); const secondsSince = time => (now() - time) / 1e3; class ConnectionMonitor { constructor(connection) { this.visibilityDidChange = this.visibilityDidChange.bind(this); this.connection = connection; this.reconnectAttempts = 0; } start() { if (!this.isRunning()) { this.startedAt = now(); delete this.stoppedAt; this.startPolling(); addEventListener("visibilitychange", this.visibilityDidChange); logger.log(`ConnectionMonitor started. stale threshold = ${this.constructor.staleThreshold} s`); } } stop() { if (this.isRunning()) { this.stoppedAt = now(); this.stopPolling(); removeEventListener("visibilitychange", this.visibilityDidChange); logger.log("ConnectionMonitor stopped"); } } isRunning() { return this.startedAt && !this.stoppedAt; } recordPing() { this.pingedAt = now(); } recordConnect() { this.reconnectAttempts = 0; this.recordPing(); delete this.disconnectedAt; logger.log("ConnectionMonitor recorded connect"); } recordDisconnect() { this.disconnectedAt = now(); logger.log("ConnectionMonitor recorded disconnect"); } startPolling() { this.stopPolling(); this.poll(); } stopPolling() { clearTimeout(this.pollTimeout); } poll() { this.pollTimeout = setTimeout((() => { this.reconnectIfStale(); this.poll(); }), this.getPollInterval()); } getPollInterval() { const {staleThreshold: staleThreshold, reconnectionBackoffRate: reconnectionBackoffRate} = this.constructor; const backoff = Math.pow(1 + reconnectionBackoffRate, Math.min(this.reconnectAttempts, 10)); const jitterMax = this.reconnectAttempts === 0 ? 1 : reconnectionBackoffRate; const jitter = jitterMax * Math.random(); return staleThreshold * 1e3 * backoff * (1 + jitter); } reconnectIfStale() { if (this.connectionIsStale()) { logger.log(`ConnectionMonitor detected stale connection. reconnectAttempts = ${this.reconnectAttempts}, time stale = ${secondsSince(this.refreshedAt)} s, stale threshold = ${this.constructor.staleThreshold} s`); this.reconnectAttempts++; if (this.disconnectedRecently()) { logger.log(`ConnectionMonitor skipping reopening recent disconnect. time disconnected = ${secondsSince(this.disconnectedAt)} s`); } else { logger.log("ConnectionMonitor reopening"); this.connection.reopen(); } } } get refreshedAt() { return this.pingedAt ? this.pingedAt : this.startedAt; } connectionIsStale() { return secondsSince(this.refreshedAt) > this.constructor.staleThreshold; } disconnectedRecently() { return this.disconnectedAt && secondsSince(this.disconnectedAt) < this.constructor.staleThreshold; } visibilityDidChange() { if (document.visibilityState === "visible") { setTimeout((() => { if (this.connectionIsStale() || !this.connection.isOpen()) { logger.log(`ConnectionMonitor reopening stale connection on visibilitychange. visibilityState = ${document.visibilityState}`); this.connection.reopen(); } }), 200); } } } ConnectionMonitor.staleThreshold = 6; ConnectionMonitor.reconnectionBackoffRate = .15; var INTERNAL = { message_types: { welcome: "welcome", disconnect: "disconnect", ping: "ping", confirmation: "confirm_subscription", rejection: "reject_subscription" }, disconnect_reasons: { unauthorized: "unauthorized", invalid_request: "invalid_request", server_restart: "server_restart" }, default_mount_path: "/cable", protocols: [ "actioncable-v1-json", "actioncable-unsupported" ] }; const {message_types: message_types, protocols: protocols} = INTERNAL; const supportedProtocols = protocols.slice(0, protocols.length - 1); const indexOf = [].indexOf; class Connection { constructor(consumer) { this.open = this.open.bind(this); this.consumer = consumer; this.subscriptions = this.consumer.subscriptions; this.monitor = new ConnectionMonitor(this); this.disconnected = true; } send(data) { if (this.isOpen()) { this.webSocket.send(JSON.stringify(data)); return true; } else { return false; } } open() { if (this.isActive()) { logger.log(`Attempted to open WebSocket, but existing socket is ${this.getState()}`); return false; } else { logger.log(`Opening WebSocket, current state is ${this.getState()}, subprotocols: ${protocols}`); if (this.webSocket) { this.uninstallEventHandlers(); } this.webSocket = new adapters.WebSocket(this.consumer.url, protocols); this.installEventHandlers(); this.monitor.start(); return true; } } close({allowReconnect: allowReconnect} = { allowReconnect: true }) { if (!allowReconnect) { this.monitor.stop(); } if (this.isActive()) { return this.webSocket.close(); } } reopen() { logger.log(`Reopening WebSocket, current state is ${this.getState()}`); if (this.isActive()) { try { return this.close(); } catch (error) { logger.log("Failed to reopen WebSocket", error); } finally { logger.log(`Reopening WebSocket in ${this.constructor.reopenDelay}ms`); setTimeout(this.open, this.constructor.reopenDelay); } } else { return this.open(); } } getProtocol() { if (this.webSocket) { return this.webSocket.protocol; } } isOpen() { return this.isState("open"); } isActive() { return this.isState("open", "connecting"); } isProtocolSupported() { return indexOf.call(supportedProtocols, this.getProtocol()) >= 0; } isState(...states) { return indexOf.call(states, this.getState()) >= 0; } getState() { if (this.webSocket) { for (let state in adapters.WebSocket) { if (adapters.WebSocket[state] === this.webSocket.readyState) { return state.toLowerCase(); } } } return null; } installEventHandlers() { for (let eventName in this.events) { const handler = this.events[eventName].bind(this); this.webSocket[`on${eventName}`] = handler; } } uninstallEventHandlers() { for (let eventName in this.events) { this.webSocket[`on${eventName}`] = function() {}; } } } Connection.reopenDelay = 500; Connection.prototype.events = { message(event) { if (!this.isProtocolSupported()) { return; } const {identifier: identifier, message: message, reason: reason, reconnect: reconnect, type: type} = JSON.parse(event.data); switch (type) { case message_types.welcome: this.monitor.recordConnect(); return this.subscriptions.reload(); case message_types.disconnect: logger.log(`Disconnecting. Reason: ${reason}`); return this.close({ allowReconnect: reconnect }); case message_types.ping: return this.monitor.recordPing(); case message_types.confirmation: this.subscriptions.confirmSubscription(identifier); return this.subscriptions.notify(identifier, "connected"); case message_types.rejection: return this.subscriptions.reject(identifier); default: return this.subscriptions.notify(identifier, "received", message); } }, open() { logger.log(`WebSocket onopen event, using '${this.getProtocol()}' subprotocol`); this.disconnected = false; if (!this.isProtocolSupported()) { logger.log("Protocol is unsupported. Stopping monitor and disconnecting."); return this.close({ allowReconnect: false }); } }, close(event) { logger.log("WebSocket onclose event"); if (this.disconnected) { return; } this.disconnected = true; this.monitor.recordDisconnect(); return this.subscriptions.notifyAll("disconnected", { willAttemptReconnect: this.monitor.isRunning() }); }, error() { logger.log("WebSocket onerror event"); } }; const extend = function(object, properties) { if (properties != null) { for (let key in properties) { const value = properties[key]; object[key] = value; } } return object; }; class Subscription { constructor(consumer, params = {}, mixin) { this.consumer = consumer; this.identifier = JSON.stringify(params); extend(this, mixin); } perform(action, data = {}) { data.action = action; return this.send(data); } send(data) { return this.consumer.send({ command: "message", identifier: this.identifier, data: JSON.stringify(data) }); } unsubscribe() { return this.consumer.subscriptions.remove(this); } } class SubscriptionGuarantor { constructor(subscriptions) { this.subscriptions = subscriptions; this.pendingSubscriptions = []; } guarantee(subscription) { if (this.pendingSubscriptions.indexOf(subscription) == -1) { logger.log(`SubscriptionGuarantor guaranteeing ${subscription.identifier}`); this.pendingSubscriptions.push(subscription); } else { logger.log(`SubscriptionGuarantor already guaranteeing ${subscription.identifier}`); } this.startGuaranteeing(); } forget(subscription) { logger.log(`SubscriptionGuarantor forgetting ${subscription.identifier}`); this.pendingSubscriptions = this.pendingSubscriptions.filter((s => s !== subscription)); } startGuaranteeing() { this.stopGuaranteeing(); this.retrySubscribing(); } stopGuaranteeing() { clearTimeout(this.retryTimeout); } retrySubscribing() { this.retryTimeout = setTimeout((() => { if (this.subscriptions && typeof this.subscriptions.subscribe === "function") { this.pendingSubscriptions.map((subscription => { logger.log(`SubscriptionGuarantor resubscribing ${subscription.identifier}`); this.subscriptions.subscribe(subscription); })); } }), 500); } } class Subscriptions { constructor(consumer) { this.consumer = consumer; this.guarantor = new SubscriptionGuarantor(this); this.subscriptions = []; } create(channelName, mixin) { const channel = channelName; const params = typeof channel === "object" ? channel : { channel: channel }; const subscription = new Subscription(this.consumer, params, mixin); return this.add(subscription); } add(subscription) { this.subscriptions.push(subscription); this.consumer.ensureActiveConnection(); this.notify(subscription, "initialized"); this.subscribe(subscription); return subscription; } remove(subscription) { this.forget(subscription); if (!this.findAll(subscription.identifier).length) { this.sendCommand(subscription, "unsubscribe"); } return subscription; } reject(identifier) { return this.findAll(identifier).map((subscription => { this.forget(subscription); this.notify(subscription, "rejected"); return subscription; })); } forget(subscription) { this.guarantor.forget(subscription); this.subscriptions = this.subscriptions.filter((s => s !== subscription)); return subscription; } findAll(identifier) { return this.subscriptions.filter((s => s.identifier === identifier)); } reload() { return this.subscriptions.map((subscription => this.subscribe(subscription))); } notifyAll(callbackName, ...args) { return this.subscriptions.map((subscription => this.notify(subscription, callbackName, ...args))); } notify(subscription, callbackName, ...args) { let subscriptions; if (typeof subscription === "string") { subscriptions = this.findAll(subscription); } else { subscriptions = [ subscription ]; } return subscriptions.map((subscription => typeof subscription[callbackName] === "function" ? subscription[callbackName](...args) : undefined)); } subscribe(subscription) { if (this.sendCommand(subscription, "subscribe")) { this.guarantor.guarantee(subscription); } } confirmSubscription(identifier) { logger.log(`Subscription confirmed ${identifier}`); this.findAll(identifier).map((subscription => this.guarantor.forget(subscription))); } sendCommand(subscription, command) { const {identifier: identifier} = subscription; return this.consumer.send({ command: command, identifier: identifier }); } } class Consumer { constructor(url) { this._url = url; this.subscriptions = new Subscriptions(this); this.connection = new Connection(this); } get url() { return createWebSocketURL(this._url); } send(data) { return this.connection.send(data); } connect() { return this.connection.open(); } disconnect() { return this.connection.close({ allowReconnect: false }); } ensureActiveConnection() { if (!this.connection.isActive()) { return this.connection.open(); } } } function createWebSocketURL(url) { if (typeof url === "function") { url = url(); } if (url && !/^wss?:/i.test(url)) { const a = document.createElement("a"); a.href = url; a.href = a.href; a.protocol = a.protocol.replace("http", "ws"); return a.href; } else { return url; } } function createConsumer(url = getConfig("url") || INTERNAL.default_mount_path) { return new Consumer(url); } function getConfig(name) { const element = document.head.querySelector(`meta[name='action-cable-${name}']`); if (element) { return element.getAttribute("content"); } } exports.Connection = Connection; exports.ConnectionMonitor = ConnectionMonitor; exports.Consumer = Consumer; exports.INTERNAL = INTERNAL; exports.Subscription = Subscription; exports.SubscriptionGuarantor = SubscriptionGuarantor; exports.Subscriptions = Subscriptions; exports.adapters = adapters; exports.createConsumer = createConsumer; exports.createWebSocketURL = createWebSocketURL; exports.getConfig = getConfig; exports.logger = logger; Object.defineProperty(exports, "__esModule", { value: true }); }));