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6b3010f95b
Fixes #130 There was a timing window where a client could connect to a broker just as new flows were deployed that would cause the on-connect callback to be called after client has been set to null. This caused an NPE. The fix is to check client isn't null in the event handler.
125 lines
5.2 KiB
JavaScript
125 lines
5.2 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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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 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] 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] 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] 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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