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/**
* Copyright 2014 IBM Corp.
*
* 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
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
**/
RED.comms = (function() {
var errornotification = null;
var subscriptions = {};
var ws;
function connectWS() {
var path = location.hostname+":"+location.port+document.location.pathname;
path = path+(path.slice(-1) == "/"?"":"/")+"comms";
path = "ws"+(document.location.protocol=="https:"?"s":"")+"://"+path;
ws = new WebSocket(path);
ws.onopen = function() {
if (errornotification) {
errornotification.close();
errornotification = null;
}
for (var t in subscriptions) {
if (subscriptions.hasOwnProperty(t)) {
ws.send(JSON.stringify({subscribe:t}));
}
}
}
ws.onmessage = function(event) {
var msg = JSON.parse(event.data);
if (msg.topic) {
for (var t in subscriptions) {
if (subscriptions.hasOwnProperty(t)) {
var re = new RegExp("^"+t.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
if (re.test(msg.topic)) {
var subscribers = subscriptions[t];
if (subscribers) {
for (var i=0;i<subscribers.length;i++) {
subscribers[i](msg.topic,msg.data);
}
}
}
}
}
}
};
ws.onclose = function() {
if (errornotification == null) {
errornotification = RED.notify("<b>Error</b>: Lost connection to server","error",true);
}
setTimeout(connectWS,1000);
}
}
function subscribe(topic,callback) {
if (subscriptions[topic] == null) {
subscriptions[topic] = [];
}
subscriptions[topic].push(callback);
if (ws && ws.readyState == 1) {
ws.send(JSON.stringify({subscribe:topic}));
}
}
function unsubscribe(topic,callback) {
if (subscriptions.topic) {
for (var i=0;i<subscriptions.topic.length;i++) {
if (subscriptions.topic[i] === callback) {
subscriptions.topic.splice(i,1);
break;
}
}
if (subscriptions.topic.length === 0) {
delete subscriptions.topic;
}
}
}
return {
connect: connectWS,
subscribe: subscribe,
unsubscribe:unsubscribe
}
})();
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