mirror of https://github.com/node-red/node-red.git
80 lines
2.8 KiB
JavaScript
80 lines
2.8 KiB
JavaScript
/**
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* Copyright 2014 IBM Corp.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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**/
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RED.comms = (function() {
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var errornotification = null;
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var subscriptions = {};
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var ws;
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function connectWS() {
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var path = location.hostname+":"+location.port+document.location.pathname;
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path = path+(path.slice(-1) == "/"?"":"/")+"comms";
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path = "ws"+(document.location.protocol=="https:"?"s":"")+"://"+path;
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ws = new WebSocket(path);
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ws.onopen = function() {
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if (errornotification) {
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errornotification.close();
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errornotification = null;
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}
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for (var t in subscriptions) {
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if (subscriptions.hasOwnProperty(t)) {
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ws.send(JSON.stringify({subscribe:t}));
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}
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}
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}
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ws.onmessage = function(event) {
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var msg = JSON.parse(event.data);
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if (msg.topic) {
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for (var t in subscriptions) {
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if (subscriptions.hasOwnProperty(t)) {
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var re = new RegExp("^"+t.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
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if (re.test(msg.topic)) {
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var subscribers = subscriptions[t];
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if (subscribers) {
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for (var i=0;i<subscribers.length;i++) {
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subscribers[i](msg.topic,msg.data);
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}
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}
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}
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}
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}
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}
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};
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ws.onclose = function() {
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if (errornotification == null) {
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errornotification = RED.notify("<b>Error</b>: Lost connection to server","error",true);
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}
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setTimeout(connectWS,1000);
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}
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}
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function subscribe(topic,callback) {
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if (subscriptions[topic] == null) {
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subscriptions[topic] = [];
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}
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subscriptions[topic].push(callback);
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if (ws && ws.readyState == 1) {
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ws.send(JSON.stringify({subscribe:topic}));
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}
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}
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return {
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connect: connectWS,
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subscribe: subscribe
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}
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})();
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