--- /dev/null
+/**
+ * Copyright 2013 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.
+ **/
+var util = require("util");
+var mqtt = require("mqtt");
+var events = require("events");
+//var inspect = require("sys").inspect;
+
+//var Client = module.exports.Client = function(
+
+var port = 1883;
+var host = "localhost";
+
+function MQTTClient(port,host) {
+ this.port = port||1883;
+ this.host = host||"localhost";
+ this.messageId = 1;
+ this.pendingSubscriptions = {};
+ this.inboundMessages = {};
+ this.lastOutbound = (new Date()).getTime();
+ this.lastInbound = (new Date()).getTime();
+ this.connected = false;
+
+ this._nextMessageId = function() {
+ this.messageId += 1;
+ if (this.messageId > 0xFFFF) {
+ this.messageId = 1;
+ }
+ return this.messageId;
+ }
+ events.EventEmitter.call(this);
+}
+util.inherits(MQTTClient, events.EventEmitter);
+
+MQTTClient.prototype.connect = function(options) {
+ if (!this.connected) {
+ var self = this;
+ options = options||{};
+ self.options = options;
+ self.options.keepalive = options.keepalive||15;
+ self.options.clean = self.options.clean||true;
+ self.options.protocolId = 'MQIsdp';
+ self.options.protocolVersion = 3;
+
+ self.client = mqtt.createConnection(this.port,this.host,function(err,client) {
+ if (err) {
+ self.connected = false;
+ clearInterval(self.watchdog);
+ self.connectionError = true;
+ //util.log('[mqtt] ['+self.uid+'] connection error 1 : '+inspect(err));
+ self.emit('connectionlost',err);
+ return;
+ }
+ client.on('close',function(e) {
+ //util.log('[mqtt] ['+self.uid+'] on close');
+ clearInterval(self.watchdog);
+ if (!self.connectionError) {
+ if (self.connected) {
+ self.connected = false;
+ self.emit('connectionlost',e);
+ } else {
+ self.emit('disconnect');
+ }
+ }
+ });
+ client.on('error',function(e) {
+ //util.log('[mqtt] ['+self.uid+'] on error : '+inspect(e));
+ clearInterval(self.watchdog);
+ if (self.connected) {
+ self.connected = false;
+ self.emit('connectionlost',e);
+ }
+ });
+ client.on('connack',function(packet) {
+ if (packet.returnCode == 0) {
+ self.watchdog = setInterval(function(self) {
+ var now = (new Date()).getTime();
+
+ //util.log('[mqtt] ['+self.uid+'] watchdog '+inspect({connected:self.connected,connectionError:self.connectionError,pingOutstanding:self.pingOutstanding,now:now,lastOutbound:self.lastOutbound,lastInbound:self.lastInbound}));
+
+ if (now - self.lastOutbound > self.options.keepalive*500 || now - self.lastInbound > self.options.keepalive*500) {
+ if (self.pingOutstanding) {
+ //util.log('[mqtt] ['+self.uid+'] watchdog pingOustanding - disconnect');
+ try {
+ self.client.disconnect();
+ } catch (err) {
+ }
+ } else {
+ //util.log('[mqtt] ['+self.uid+'] watchdog pinging');
+ self.lastOutbound = (new Date()).getTime();
+ self.lastInbound = (new Date()).getTime();
+ self.pingOutstanding = true;
+ self.client.pingreq();
+ }
+ }
+
+ },self.options.keepalive*500,self);
+ self.pingOutstanding = false;
+ self.lastInbound = (new Date()).getTime()
+ self.lastOutbound = (new Date()).getTime()
+ self.connected = true;
+ self.connectionError = false;
+ self.emit('connect');
+ } else {
+ self.connected = false;
+ self.emit('connectionlost');
+ }
+ });
+ client.on('suback',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ var topic = self.pendingSubscriptions[packet.messageId];
+ self.emit('subscribe',topic,packet.granted[0]);
+ delete self.pendingSubscriptions[packet.messageId];
+ });
+ client.on('unsuback',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ var topic = self.pendingSubscriptions[packet.messageId];
+ self.emit('unsubscribe',topic,packet.granted[0]);
+ delete self.pendingSubscriptions[packet.messageId];
+ });
+ client.on('publish',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ if (packet.qos < 2) {
+ var p = packet;
+ self.emit('message',p.topic,p.payload,p.qos,p.retain);
+ } else {
+ self.inboundMessages[packet.messageId] = packet;
+ this.lastOutbound = (new Date()).getTime()
+ self.client.pubrec(packet);
+ }
+ if (packet.qos == 1) {
+ this.lastOutbound = (new Date()).getTime()
+ self.client.puback(packet);
+ }
+ });
+
+ client.on('pubrel',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ var p = self.inboundMessages[packet.messageId];
+ if (p) {
+ self.emit('message',p.topic,p.payload,p.qos,p.retain);
+ delete self.inboundMessages[packet.messageId];
+ }
+ self.lastOutbound = (new Date()).getTime()
+ self.client.pubcomp(packet);
+ });
+
+ client.on('puback',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ // outbound qos-1 complete
+ });
+
+ client.on('pubrec',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ self.lastOutbound = (new Date()).getTime()
+ self.client.pubrel(packet);
+ });
+ client.on('pubcomp',function(packet) {
+ self.lastInbound = (new Date()).getTime()
+ // outbound qos-2 complete
+ });
+ client.on('pingresp',function(packet) {
+ //util.log('[mqtt] ['+self.uid+'] received pingresp');
+ self.lastInbound = (new Date()).getTime()
+ self.pingOutstanding = false;
+ });
+
+ this.lastOutbound = (new Date()).getTime()
+ this.connectionError = false;
+ client.connect(self.options);
+ });
+ }
+}
+
+MQTTClient.prototype.subscribe = function(topic,qos) {
+ var self = this;
+ if (self.connected) {
+ var options = {
+ subscriptions:[{topic:topic,qos:qos}],
+ messageId: self._nextMessageId()
+ };
+ this.pendingSubscriptions[options.messageId] = topic;
+ this.lastOutbound = (new Date()).getTime()
+ self.client.subscribe(options);
+ }
+}
+MQTTClient.prototype.unsubscribe = function(topic) {
+ var self = this;
+ if (self.connected) {
+ var options = {
+ topic:topic,
+ messageId: self._nextMessageId()
+ };
+ this.pendingSubscriptions[options.messageId] = topic;
+ this.lastOutbound = (new Date()).getTime()
+ self.client.unsubscribe(options);
+ }
+}
+
+MQTTClient.prototype.publish = function(topic,payload,qos,retain) {
+ var self = this;
+ if (self.connected) {
+
+ if (!Buffer.isBuffer(payload)) {
+ if (typeof payload === "object") {
+ payload = JSON.stringify(payload);
+ } else if (typeof payload !== "string") {
+ payload = ""+payload;
+ }
+ }
+ var options = {
+ topic: topic,
+ payload: payload,
+ qos: qos||0,
+ retain:retain||false
+ };
+ if (options.qos != 0) {
+ options.messageId = self._nextMessageId();
+ }
+ this.lastOutbound = (new Date()).getTime()
+ self.client.publish(options);
+ }
+}
+
+MQTTClient.prototype.disconnect = function() {
+ var self = this;
+ if (this.connected) {
+ this.connected = false;
+ try {
+ this.client.disconnect();
+ } catch(err) {
+ }
+ }
+}
+MQTTClient.prototype.isConnected = function() {
+ return this.connected;
+}
+module.exports.createClient = function(port,host) {
+ var mqtt_client = new MQTTClient(port,host);
+ return mqtt_client;
+}
+
Code Review / ccsdk / distribution.git / blobdiff