mirror of
https://github.com/node-red/node-red.git
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255 lines
9.6 KiB
JavaScript
255 lines
9.6 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 events = require("events");
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//var inspect = require("sys").inspect;
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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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if (!this.connected) {
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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.connected = false;
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clearInterval(self.watchdog);
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self.connectionError = true;
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//util.log('[mqtt] ['+self.uid+'] connection error 1 : '+inspect(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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//util.log('[mqtt] ['+self.uid+'] on close');
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clearInterval(self.watchdog);
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if (!self.connectionError) {
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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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});
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client.on('error',function(e) {
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//util.log('[mqtt] ['+self.uid+'] on error : '+inspect(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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//util.log('[mqtt] ['+self.uid+'] watchdog '+inspect({connected:self.connected,connectionError:self.connectionError,pingOutstanding:self.pingOutstanding,now:now,lastOutbound:self.lastOutbound,lastInbound:self.lastInbound}));
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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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//util.log('[mqtt] ['+self.uid+'] watchdog pingOustanding - disconnect');
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try {
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self.client.disconnect();
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} catch (err) {
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}
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} else {
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//util.log('[mqtt] ['+self.uid+'] watchdog pinging');
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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.pingOutstanding = false;
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self.lastInbound = (new Date()).getTime()
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self.lastOutbound = (new Date()).getTime()
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self.connected = true;
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self.connectionError = false;
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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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if (p) {
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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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}
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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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//util.log('[mqtt] ['+self.uid+'] received pingresp');
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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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this.connectionError = false;
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client.connect(self.options);
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});
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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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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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}
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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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try {
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this.client.disconnect();
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} catch(err) {
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}
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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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