reconnecting-websocket/dist/reconnecting-websocket-mjs.js

/*! *****************************************************************************
Copyright (c) Microsoft Corporation. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License"); you may not use
this file except in compliance with the License. You may obtain a copy of the
License at http://www.apache.org/licenses/LICENSE-2.0

THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION ANY IMPLIED
WARRANTIES OR CONDITIONS OF TITLE, FITNESS FOR A PARTICULAR PURPOSE,
MERCHANTABLITY OR NON-INFRINGEMENT.

See the Apache Version 2.0 License for specific language governing permissions
and limitations under the License.
***************************************************************************** */
/* global Reflect, Promise */

var extendStatics = function(d, b) {
    extendStatics = Object.setPrototypeOf ||
        ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
        function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
    return extendStatics(d, b);
};

function __extends(d, b) {
    extendStatics(d, b);
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
}

function __values(o) {
    var m = typeof Symbol === "function" && o[Symbol.iterator], i = 0;
    if (m) return m.call(o);
    return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
}

function __read(o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
}

function __spread() {
    for (var ar = [], i = 0; i < arguments.length; i++)
        ar = ar.concat(__read(arguments[i]));
    return ar;
}

var Event = /** @class */ (function () {
    function Event(type, target) {
        this.target = target;
        this.type = type;
    }
    return Event;
}());
var ErrorEvent = /** @class */ (function (_super) {
    __extends(ErrorEvent, _super);
    function ErrorEvent(error, target) {
        var _this = _super.call(this, 'error', target) || this;
        _this.message = error.message;
        _this.error = error;
        return _this;
    }
    return ErrorEvent;
}(Event));
var CloseEvent = /** @class */ (function (_super) {
    __extends(CloseEvent, _super);
    function CloseEvent(code, reason, target) {
        if (code === void 0) { code = 1000; }
        if (reason === void 0) { reason = ''; }
        var _this = _super.call(this, 'close', target) || this;
        _this.wasClean = true;
        _this.code = code;
        _this.reason = reason;
        return _this;
    }
    return CloseEvent;
}(Event));

/*!
 * Reconnecting WebSocket
 * by Pedro Ladaria <pedro.ladaria@gmail.com>
 * https://github.com/pladaria/reconnecting-websocket
 * License MIT
 */
var getGlobalWebSocket = function () {
    if (typeof WebSocket !== 'undefined') {
        // @ts-ignore
        return WebSocket;
    }
};
/**
 * Returns true if given argument looks like a WebSocket class
 */
var isWebSocket = function (w) { return typeof w !== 'undefined' && !!w && w.CLOSING === 2; };
var DEFAULT = {
    maxReconnectionDelay: 10000,
    minReconnectionDelay: 1000 + Math.random() * 4000,
    minUptime: 5000,
    reconnectionDelayGrowFactor: 1.3,
    connectionTimeout: 4000,
    maxRetries: Infinity,
    maxEnqueuedMessages: Infinity,
    startClosed: false,
    debug: false,
};
var ReconnectingWebSocket = /** @class */ (function () {
    function ReconnectingWebSocket(url, protocols, options) {
        var _this = this;
        if (options === void 0) { options = {}; }
        this._listeners = {
            error: [],
            message: [],
            open: [],
            close: [],
        };
        this._retryCount = -1;
        this._shouldReconnect = true;
        this._connectLock = false;
        this._binaryType = 'blob';
        this._closeCalled = false;
        this._messageQueue = [];
        /**
         * An event listener to be called when the WebSocket connection's readyState changes to CLOSED
         */
        this.onclose = null;
        /**
         * An event listener to be called when an error occurs
         */
        this.onerror = null;
        /**
         * An event listener to be called when a message is received from the server
         */
        this.onmessage = null;
        /**
         * An event listener to be called when the WebSocket connection's readyState changes to OPEN;
         * this indicates that the connection is ready to send and receive data
         */
        this.onopen = null;
        this._handleOpen = function (event) {
            _this._debug('open event');
            var _a = _this._options.minUptime, minUptime = _a === void 0 ? DEFAULT.minUptime : _a;
            clearTimeout(_this._connectTimeout);
            _this._uptimeTimeout = setTimeout(function () { return _this._acceptOpen(); }, minUptime);
            _this._ws.binaryType = _this._binaryType;
            // send enqueued messages (messages sent before websocket open event)
            _this._messageQueue.forEach(function (message) { return _this._ws.send(message); });
            _this._messageQueue = [];
            if (_this.onopen) {
                _this.onopen(event);
            }
            _this._listeners.open.forEach(function (listener) { return _this._callEventListener(event, listener); });
        };
        this._handleMessage = function (event) {
            _this._debug('message event');
            if (_this.onmessage) {
                _this.onmessage(event);
            }
            _this._listeners.message.forEach(function (listener) { return _this._callEventListener(event, listener); });
        };
        this._handleError = function (event) {
            _this._debug('error event', event.message);
            _this._disconnect(undefined, event.message === 'TIMEOUT' ? 'timeout' : undefined);
            if (_this.onerror) {
                _this.onerror(event);
            }
            _this._debug('exec error listeners');
            _this._listeners.error.forEach(function (listener) { return _this._callEventListener(event, listener); });
            _this._connect();
        };
        this._handleClose = function (event) {
            _this._debug('close event');
            _this._clearTimeouts();
            if (_this._shouldReconnect) {
                _this._connect();
            }
            if (_this.onclose) {
                _this.onclose(event);
            }
            _this._listeners.close.forEach(function (listener) { return _this._callEventListener(event, listener); });
        };
        this._url = url;
        this._protocols = protocols;
        this._options = options;
        if (this._options.startClosed) {
            this._shouldReconnect = false;
        }
        this._connect();
    }
    Object.defineProperty(ReconnectingWebSocket, "CONNECTING", {
        get: function () {
            return 0;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket, "OPEN", {
        get: function () {
            return 1;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket, "CLOSING", {
        get: function () {
            return 2;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket, "CLOSED", {
        get: function () {
            return 3;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "CONNECTING", {
        get: function () {
            return ReconnectingWebSocket.CONNECTING;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "OPEN", {
        get: function () {
            return ReconnectingWebSocket.OPEN;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "CLOSING", {
        get: function () {
            return ReconnectingWebSocket.CLOSING;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "CLOSED", {
        get: function () {
            return ReconnectingWebSocket.CLOSED;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "binaryType", {
        get: function () {
            return this._ws ? this._ws.binaryType : this._binaryType;
        },
        set: function (value) {
            this._binaryType = value;
            if (this._ws) {
                this._ws.binaryType = value;
            }
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "retryCount", {
        /**
         * Returns the number or connection retries
         */
        get: function () {
            return Math.max(this._retryCount, 0);
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "bufferedAmount", {
        /**
         * The number of bytes of data that have been queued using calls to send() but not yet
         * transmitted to the network. This value resets to zero once all queued data has been sent.
         * This value does not reset to zero when the connection is closed; if you keep calling send(),
         * this will continue to climb. Read only
         */
        get: function () {
            var bytes = this._messageQueue.reduce(function (acc, message) {
                if (typeof message === 'string') {
                    acc += message.length; // not byte size
                }
                else if (message instanceof Blob) {
                    acc += message.size;
                }
                else {
                    acc += message.byteLength;
                }
                return acc;
            }, 0);
            return bytes + (this._ws ? this._ws.bufferedAmount : 0);
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "extensions", {
        /**
         * The extensions selected by the server. This is currently only the empty string or a list of
         * extensions as negotiated by the connection
         */
        get: function () {
            return this._ws ? this._ws.extensions : '';
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "protocol", {
        /**
         * A string indicating the name of the sub-protocol the server selected;
         * this will be one of the strings specified in the protocols parameter when creating the
         * WebSocket object
         */
        get: function () {
            return this._ws ? this._ws.protocol : '';
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "readyState", {
        /**
         * The current state of the connection; this is one of the Ready state constants
         */
        get: function () {
            if (this._ws) {
                return this._ws.readyState;
            }
            return this._options.startClosed
                ? ReconnectingWebSocket.CLOSED
                : ReconnectingWebSocket.CONNECTING;
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(ReconnectingWebSocket.prototype, "url", {
        /**
         * The URL as resolved by the constructor
         */
        get: function () {
            return this._ws ? this._ws.url : '';
        },
        enumerable: true,
        configurable: true
    });
    /**
     * Closes the WebSocket connection or connection attempt, if any. If the connection is already
     * CLOSED, this method does nothing
     */
    ReconnectingWebSocket.prototype.close = function (code, reason) {
        if (code === void 0) { code = 1000; }
        this._closeCalled = true;
        this._shouldReconnect = false;
        this._clearTimeouts();
        if (!this._ws) {
            this._debug('close enqueued: no ws instance');
            return;
        }
        if (this._ws.readyState === this.CLOSED) {
            this._debug('close: already closed');
            return;
        }
        this._ws.close(code, reason);
    };
    /**
     * Closes the WebSocket connection or connection attempt and connects again.
     * Resets retry counter;
     */
    ReconnectingWebSocket.prototype.reconnect = function (code, reason) {
        this._shouldReconnect = true;
        this._closeCalled = false;
        this._retryCount = -1;
        if (!this._ws || this._ws.readyState === this.CLOSED) {
            this._connect();
        }
        else {
            this._disconnect(code, reason);
            this._connect();
        }
    };
    /**
     * Enqueue specified data to be transmitted to the server over the WebSocket connection
     */
    ReconnectingWebSocket.prototype.send = function (data) {
        if (this._ws && this._ws.readyState === this.OPEN) {
            this._debug('send', data);
            this._ws.send(data);
        }
        else {
            var _a = this._options.maxEnqueuedMessages, maxEnqueuedMessages = _a === void 0 ? DEFAULT.maxEnqueuedMessages : _a;
            if (this._messageQueue.length < maxEnqueuedMessages) {
                this._debug('enqueue', data);
                this._messageQueue.push(data);
            }
        }
    };
    /**
     * Register an event handler of a specific event type
     */
    ReconnectingWebSocket.prototype.addEventListener = function (type, listener) {
        if (this._listeners[type]) {
            // @ts-ignore
            this._listeners[type].push(listener);
        }
    };
    ReconnectingWebSocket.prototype.dispatchEvent = function (event) {
        var e_1, _a;
        var listeners = this._listeners[event.type];
        if (listeners) {
            try {
                for (var listeners_1 = __values(listeners), listeners_1_1 = listeners_1.next(); !listeners_1_1.done; listeners_1_1 = listeners_1.next()) {
                    var listener = listeners_1_1.value;
                    this._callEventListener(event, listener);
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (listeners_1_1 && !listeners_1_1.done && (_a = listeners_1.return)) _a.call(listeners_1);
                }
                finally { if (e_1) throw e_1.error; }
            }
        }
        return true;
    };
    /**
     * Removes an event listener
     */
    ReconnectingWebSocket.prototype.removeEventListener = function (type, listener) {
        if (this._listeners[type]) {
            // @ts-ignore
            this._listeners[type] = this._listeners[type].filter(function (l) { return l !== listener; });
        }
    };
    ReconnectingWebSocket.prototype._debug = function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        if (this._options.debug) {
            // not using spread because compiled version uses Symbols
            // tslint:disable-next-line
            console.log.apply(console, __spread(['RWS>'], args));
        }
    };
    ReconnectingWebSocket.prototype._getNextDelay = function () {
        var _a = this._options, _b = _a.reconnectionDelayGrowFactor, reconnectionDelayGrowFactor = _b === void 0 ? DEFAULT.reconnectionDelayGrowFactor : _b, _c = _a.minReconnectionDelay, minReconnectionDelay = _c === void 0 ? DEFAULT.minReconnectionDelay : _c, _d = _a.maxReconnectionDelay, maxReconnectionDelay = _d === void 0 ? DEFAULT.maxReconnectionDelay : _d;
        var delay = 0;
        if (this._retryCount > 0) {
            delay =
                minReconnectionDelay * Math.pow(reconnectionDelayGrowFactor, this._retryCount - 1);
            if (delay > maxReconnectionDelay) {
                delay = maxReconnectionDelay;
            }
        }
        this._debug('next delay', delay);
        return delay;
    };
    ReconnectingWebSocket.prototype._wait = function () {
        var _this = this;
        return new Promise(function (resolve) {
            setTimeout(resolve, _this._getNextDelay());
        });
    };
    ReconnectingWebSocket.prototype._getNextUrl = function (urlProvider) {
        if (typeof urlProvider === 'string') {
            return Promise.resolve(urlProvider);
        }
        if (typeof urlProvider === 'function') {
            var url = urlProvider();
            if (typeof url === 'string') {
                return Promise.resolve(url);
            }
            if (!!url.then) {
                return url;
            }
        }
        throw Error('Invalid URL');
    };
    ReconnectingWebSocket.prototype._connect = function () {
        var _this = this;
        if (this._connectLock || !this._shouldReconnect) {
            return;
        }
        this._connectLock = true;
        var _a = this._options, _b = _a.maxRetries, maxRetries = _b === void 0 ? DEFAULT.maxRetries : _b, _c = _a.connectionTimeout, connectionTimeout = _c === void 0 ? DEFAULT.connectionTimeout : _c, _d = _a.WebSocket, WebSocket = _d === void 0 ? getGlobalWebSocket() : _d;
        if (this._retryCount >= maxRetries) {
            this._debug('max retries reached', this._retryCount, '>=', maxRetries);
            return;
        }
        this._retryCount++;
        this._debug('connect', this._retryCount);
        this._removeListeners();
        if (!isWebSocket(WebSocket)) {
            throw Error('No valid WebSocket class provided');
        }
        this._wait()
            .then(function () { return _this._getNextUrl(_this._url); })
            .then(function (url) {
            // close could be called before creating the ws
            if (_this._closeCalled) {
                return;
            }
            _this._debug('connect', { url: url, protocols: _this._protocols });
            _this._ws = _this._protocols
                ? new WebSocket(url, _this._protocols)
                : new WebSocket(url);
            _this._ws.binaryType = _this._binaryType;
            _this._connectLock = false;
            _this._addListeners();
            _this._connectTimeout = setTimeout(function () { return _this._handleTimeout(); }, connectionTimeout);
        });
    };
    ReconnectingWebSocket.prototype._handleTimeout = function () {
        this._debug('timeout event');
        this._handleError(new ErrorEvent(Error('TIMEOUT'), this));
    };
    ReconnectingWebSocket.prototype._disconnect = function (code, reason) {
        if (code === void 0) { code = 1000; }
        this._clearTimeouts();
        if (!this._ws) {
            return;
        }
        this._removeListeners();
        try {
            this._ws.close(code, reason);
            this._handleClose(new CloseEvent(code, reason, this));
        }
        catch (error) {
            // ignore
        }
    };
    ReconnectingWebSocket.prototype._acceptOpen = function () {
        this._debug('accept open');
        this._retryCount = 0;
    };
    ReconnectingWebSocket.prototype._callEventListener = function (event, listener) {
        if ('handleEvent' in listener) {
            // @ts-ignore
            listener.handleEvent(event);
        }
        else {
            // @ts-ignore
            listener(event);
        }
    };
    ReconnectingWebSocket.prototype._removeListeners = function () {
        if (!this._ws) {
            return;
        }
        this._debug('removeListeners');
        this._ws.removeEventListener('open', this._handleOpen);
        this._ws.removeEventListener('close', this._handleClose);
        this._ws.removeEventListener('message', this._handleMessage);
        // @ts-ignore
        this._ws.removeEventListener('error', this._handleError);
    };
    ReconnectingWebSocket.prototype._addListeners = function () {
        if (!this._ws) {
            return;
        }
        this._debug('addListeners');
        this._ws.addEventListener('open', this._handleOpen);
        this._ws.addEventListener('close', this._handleClose);
        this._ws.addEventListener('message', this._handleMessage);
        // @ts-ignore
        this._ws.addEventListener('error', this._handleError);
    };
    ReconnectingWebSocket.prototype._clearTimeouts = function () {
        clearTimeout(this._connectTimeout);
        clearTimeout(this._uptimeTimeout);
    };
    return ReconnectingWebSocket;
}());

export default ReconnectingWebSocket;