mirror of https://github.com/node-red/node-red.git
129 lines
5.4 KiB
JavaScript
129 lines
5.4 KiB
JavaScript
/**
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* Copyright 2013 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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var util = require("util");
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var mqtt = require("./mqtt");
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var settings = require(process.env.NODE_RED_HOME+"/red/red").settings;
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var connections = {};
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function matchTopic(ts,t) {
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if (ts == "#") {
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return true;
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}
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var re = new RegExp("^"+ts.replace(/([\[\]\?\(\)\\\\$\^\*\.|])/g,"\\$1").replace(/\+/g,"[^/]+").replace(/\/#$/,"(\/.*)?")+"$");
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return re.test(t);
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}
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module.exports = {
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get: function(broker,port,clientid,username,password) {
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var id = "["+(username||"")+":"+(password||"")+"]["+(clientid||"")+"]@"+broker+":"+port;
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if (!connections[id]) {
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connections[id] = function() {
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var uid = (1+Math.random()*4294967295).toString(16);
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var client = mqtt.createClient(port,broker);
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client.setMaxListeners(0);
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var options = {keepalive:15};
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options.clientId = clientid || 'mqtt_' + (1+Math.random()*4294967295).toString(16);
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options.username = username;
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options.password = password;
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var queue = [];
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var subscriptions = [];
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var connecting = false;
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var obj = {
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_instances: 0,
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publish: function(msg) {
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if (client.isConnected()) {
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client.publish(msg.topic,msg.payload,msg.qos,msg.retain);
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} else {
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if (!connecting) {
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connecting = true;
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client.connect(options);
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}
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queue.push(msg);
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}
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},
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subscribe: function(topic,qos,callback) {
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subscriptions.push({topic:topic,qos:qos,callback:callback});
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client.on('message',function(mtopic,mpayload,mqos,mretain) {
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if (matchTopic(topic,mtopic)) {
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callback(mtopic,mpayload,mqos,mretain);
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}
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});
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if (client.isConnected()) {
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client.subscribe(topic,qos);
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}
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},
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on: function(a,b){
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client.on(a,b);
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},
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once: function(a,b){
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client.once(a,b);
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},
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connect: function() {
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if (!client.isConnected() && !connecting) {
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connecting = true;
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client.connect(options);
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}
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},
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disconnect: function() {
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this._instances -= 1;
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if (this._instances == 0) {
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client.disconnect();
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client = null;
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delete connections[id];
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}
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}
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};
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client.on('connect',function() {
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if (client) {
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util.log('[mqtt] ['+uid+'] connected to broker tcp://'+broker+':'+port);
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connecting = false;
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for (var s in subscriptions) {
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var topic = subscriptions[s].topic;
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var qos = subscriptions[s].qos;
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var callback = subscriptions[s].callback;
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client.subscribe(topic,qos);
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}
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//console.log("connected - publishing",queue.length,"messages");
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while(queue.length) {
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var msg = queue.shift();
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//console.log(msg);
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client.publish(msg.topic,msg.payload,msg.qos,msg.retain);
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}
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}
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});
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client.on('connectionlost', function(err) {
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util.log('[mqtt] ['+uid+'] connection lost to broker tcp://'+broker+':'+port);
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setTimeout(function() {
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if (client) {
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client.connect(options);
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}
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}, settings.mqttReconnectTime||5000);
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});
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client.on('disconnect', function() {
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util.log('[mqtt] ['+uid+'] disconnected from broker tcp://'+broker+':'+port);
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});
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return obj
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}();
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}
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connections[id]._instances += 1;
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return connections[id];
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}
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};
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