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Nicholas O'Leary
225
nodes/io/lib/mqtt.js
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225
nodes/io/lib/mqtt.js
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/**
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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 events = require("events");
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//var Client = module.exports.Client = function(
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var port = 1883;
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var host = "localhost";
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function MQTTClient(port,host) {
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this.port = port||1883;
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this.host = host||"localhost";
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this.messageId = 1;
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this.pendingSubscriptions = {};
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this.inboundMessages = {};
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this.lastOutbound = (new Date()).getTime();
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this.lastInbound = (new Date()).getTime();
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this.connected = false;
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this._nextMessageId = function() {
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this.messageId += 1;
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if (this.messageId > 0xFFFF) {
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this.messageId = 1;
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}
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return this.messageId;
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}
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events.EventEmitter.call(this);
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}
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util.inherits(MQTTClient, events.EventEmitter);
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MQTTClient.prototype.connect = function(options) {
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var self = this;
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options = options||{};
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self.options = options;
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self.options.keepalive = options.keepalive||15;
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self.options.clean = self.options.clean||true;
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self.options.protocolId = 'MQIsdp';
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self.options.protocolVersion = 3;
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self.client = mqtt.createConnection(this.port,this.host,function(err,client) {
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if (err) {
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self.emit('connectionlost',err);
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return;
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}
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client.on('close',function(e) {
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clearInterval(self.watchdog);
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if (self.connected) {
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self.connected = false;
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self.emit('connectionlost',e);
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} else {
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self.emit('disconnect');
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}
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});
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client.on('error',function(e) {
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clearInterval(self.watchdog);
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if (self.connected) {
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self.connected = false;
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self.emit('connectionlost',e);
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}
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});
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client.on('connack',function(packet) {
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if (packet.returnCode == 0) {
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self.watchdog = setInterval(function(self) {
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var now = (new Date()).getTime();
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if (now - self.lastOutbound > self.options.keepalive*500 || now - self.lastInbound > self.options.keepalive*500) {
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if (self.pingOutstanding) {
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// DO DISCONNECT
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} else {
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self.lastOutbound = (new Date()).getTime();
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self.lastInbound = (new Date()).getTime();
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self.pingOutstanding = true;
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self.client.pingreq();
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}
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}
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},self.options.keepalive*500,self);
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self.lastInbound = (new Date()).getTime()
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self.connected = true;
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self.emit('connect');
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} else {
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self.connected = false;
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self.emit('connectionlost');
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}
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});
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client.on('suback',function(packet) {
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self.lastInbound = (new Date()).getTime()
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var topic = self.pendingSubscriptions[packet.messageId];
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self.emit('subscribe',topic,packet.granted[0]);
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delete self.pendingSubscriptions[packet.messageId];
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});
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client.on('unsuback',function(packet) {
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self.lastInbound = (new Date()).getTime()
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var topic = self.pendingSubscriptions[packet.messageId];
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self.emit('unsubscribe',topic,packet.granted[0]);
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delete self.pendingSubscriptions[packet.messageId];
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});
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client.on('publish',function(packet) {
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self.lastInbound = (new Date()).getTime()
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if (packet.qos < 2) {
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var p = packet;
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self.emit('message',p.topic,p.payload,p.qos,p.retain);
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} else {
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self.inboundMessages[packet.messageId] = packet;
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this.lastOutbound = (new Date()).getTime()
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self.client.pubrec(packet);
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}
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if (packet.qos == 1) {
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this.lastOutbound = (new Date()).getTime()
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self.client.puback(packet);
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}
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});
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client.on('pubrel',function(packet) {
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self.lastInbound = (new Date()).getTime()
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var p = self.inboundMessages[packet.messageId];
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self.emit('message',p.topic,p.payload,p.qos,p.retain);
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delete self.inboundMessages[packet.messageId];
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self.lastOutbound = (new Date()).getTime()
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self.client.pubcomp(packet);
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});
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client.on('puback',function(packet) {
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self.lastInbound = (new Date()).getTime()
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// outbound qos-1 complete
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});
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client.on('pubrec',function(packet) {
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self.lastInbound = (new Date()).getTime()
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self.lastOutbound = (new Date()).getTime()
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self.client.pubrel(packet);
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});
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client.on('pubcomp',function(packet) {
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self.lastInbound = (new Date()).getTime()
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// outbound qos-2 complete
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});
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client.on('pingresp',function(packet) {
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self.lastInbound = (new Date()).getTime()
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self.pingOutstanding = false;
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});
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this.lastOutbound = (new Date()).getTime()
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client.connect(self.options);
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});
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}
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MQTTClient.prototype.subscribe = function(topic,qos) {
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var self = this;
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if (self.connected) {
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var options = {
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subscriptions:[{topic:topic,qos:qos}],
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messageId: self._nextMessageId()
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};
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this.pendingSubscriptions[options.messageId] = topic;
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this.lastOutbound = (new Date()).getTime()
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self.client.subscribe(options);
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}
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}
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MQTTClient.prototype.unsubscribe = function(topic) {
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var self = this;
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if (self.connected) {
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var options = {
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topic:topic,
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messageId: self._nextMessageId()
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};
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this.pendingSubscriptions[options.messageId] = topic;
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this.lastOutbound = (new Date()).getTime()
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self.client.unsubscribe(options);
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}
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}
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MQTTClient.prototype.publish = function(topic,payload,qos,retain) {
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var self = this;
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if (self.connected) {
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if (Buffer.isBuffer(payload)) {
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payload = payload.toString();
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} else if (typeof payload === "object") {
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payload = JSON.stringify(payload);
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} else if (typeof payload !== "string") {
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payload = ""+payload;
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}
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var options = {
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topic: topic,
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payload: payload,
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qos: qos||0,
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retain:retain||false
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};
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if (options.qos != 0) {
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options.messageId = self._nextMessageId();
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}
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this.lastOutbound = (new Date()).getTime()
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self.client.publish(options);
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}
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}
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MQTTClient.prototype.disconnect = function() {
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var self = this;
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if (this.connected) {
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this.connected = false;
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this.client.disconnect();
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}
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}
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MQTTClient.prototype.isConnected = function() {
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return this.connected;
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}
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module.exports.createClient = function(port,host) {
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var mqtt_client = new MQTTClient(port,host);
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return mqtt_client;
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}
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119
nodes/io/lib/mqttConnectionPool.js
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119
nodes/io/lib/mqttConnectionPool.js
Normal file
@@ -0,0 +1,119 @@
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/**
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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("../../../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) {
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var id = 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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var options = {keepalive:15,clientId:'mqtt_' + (1+Math.random()*4294967295).toString(16)};
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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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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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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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