forked from DGNum/gestioCOF
Suppression js inutile
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Aurélien Delobelle
parent
8256c96ffb
commit
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1 changed files with 0 additions and 167 deletions
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/**
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* options.uri - > The Websocket URI
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* options.connected -> Callback called after the websocket is connected.
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* options.connecting -> Callback called when the websocket is connecting.
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* options.disconnected -> Callback called after the websocket is disconnected.
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* options.receive_message -> Callback called when a message is received from the websocket.
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* options.heartbeat_msg -> String to identify the heartbeat message.
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* $ -> JQuery instance.
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*/
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function WS4Redis(options, $) {
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'use strict';
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var opts, ws, deferred, timer, attempts = 1, must_reconnect = true;
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var heartbeat_interval = null, missed_heartbeats = 0;
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if (this === undefined)
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return new WS4Redis(options, $);
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if (options.uri === undefined)
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throw new Error('No Websocket URI in options');
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if ($ === undefined)
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$ = jQuery;
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opts = $.extend({ heartbeat_msg: null }, options);
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connect(opts.uri);
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function connect(uri) {
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try {
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if (ws && (is_connecting() || is_connected())) {
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console.log("Websocket is connecting or already connected.");
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return;
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}
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if ($.type(opts.connecting) === 'function') {
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opts.connecting();
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}
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console.log("Connecting to " + uri + " ...");
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deferred = $.Deferred();
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ws = new WebSocket(uri);
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ws.onopen = on_open;
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ws.onmessage = on_message;
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ws.onerror = on_error;
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ws.onclose = on_close;
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timer = null;
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} catch (err) {
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try_to_reconnect();
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deferred.reject(new Error(err));
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}
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}
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function try_to_reconnect() {
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if (must_reconnect && !timer) {
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// try to reconnect
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console.log('Reconnecting...');
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var interval = generate_inteval(attempts);
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timer = setTimeout(function() {
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attempts++;
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connect(ws.url);
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}, interval);
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}
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}
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function send_heartbeat() {
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try {
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missed_heartbeats++;
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if (missed_heartbeats > 3)
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throw new Error("Too many missed heartbeats.");
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ws.send(opts.heartbeat_msg);
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} catch(e) {
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clearInterval(heartbeat_interval);
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heartbeat_interval = null;
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console.warn("Closing connection. Reason: " + e.message);
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if ( !is_closing() && !is_closed() ) {
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ws.close();
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}
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}
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}
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function on_open() {
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console.log('Connected!');
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// new connection, reset attemps counter
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attempts = 1;
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deferred.resolve();
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if (opts.heartbeat_msg && heartbeat_interval === null) {
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missed_heartbeats = 0;
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heartbeat_interval = setInterval(send_heartbeat, 5000);
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}
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if ($.type(opts.connected) === 'function') {
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opts.connected();
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}
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}
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function on_close(evt) {
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console.log("Connection closed!");
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if ($.type(opts.disconnected) === 'function') {
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opts.disconnected(evt);
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}
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try_to_reconnect();
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}
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function on_error(evt) {
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console.error("Websocket connection is broken!");
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deferred.reject(new Error(evt));
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}
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function on_message(evt) {
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if (opts.heartbeat_msg && evt.data === opts.heartbeat_msg) {
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// reset the counter for missed heartbeats
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missed_heartbeats = 0;
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} else if ($.type(opts.receive_message) === 'function') {
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return opts.receive_message(evt.data);
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}
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}
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// this code is borrowed from http://blog.johnryding.com/post/78544969349/
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//
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// Generate an interval that is randomly between 0 and 2^k - 1, where k is
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// the number of connection attmpts, with a maximum interval of 30 seconds,
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// so it starts at 0 - 1 seconds and maxes out at 0 - 30 seconds
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function generate_inteval(k) {
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var maxInterval = (Math.pow(2, k) - 1) * 1000;
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// If the generated interval is more than 30 seconds, truncate it down to 30 seconds.
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if (maxInterval > 30*1000) {
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maxInterval = 30*1000;
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}
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// generate the interval to a random number between 0 and the maxInterval determined from above
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return Math.random() * maxInterval;
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}
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this.send_message = function(message) {
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ws.send(message);
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};
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this.get_state = function() {
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return ws.readyState;
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};
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function is_connecting() {
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return ws && ws.readyState === 0;
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}
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function is_connected() {
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return ws && ws.readyState === 1;
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}
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function is_closing() {
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return ws && ws.readyState === 2;
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}
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function is_closed() {
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return ws && ws.readyState === 3;
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}
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this.close = function () {
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clearInterval(heartbeat_interval);
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must_reconnect = false;
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if (!is_closing() || !is_closed()) {
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ws.close();
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}
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}
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this.is_connecting = is_connecting;
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this.is_connected = is_connected;
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this.is_closing = is_closing;
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this.is_closed = is_closed;
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}
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