'use strict'
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/**
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* Module dependencies
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*/
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var events = require('events')
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var Store = require('./store')
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var eos = require('end-of-stream')
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var mqttPacket = require('mqtt-packet')
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var Writable = require('readable-stream').Writable
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var inherits = require('inherits')
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var reInterval = require('reinterval')
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var validations = require('./validations')
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var xtend = require('xtend')
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var setImmediate = global.setImmediate || function (callback) {
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// works in node v0.8
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process.nextTick(callback)
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}
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var defaultConnectOptions = {
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keepalive: 60,
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reschedulePings: true,
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protocolId: 'MQTT',
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protocolVersion: 4,
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reconnectPeriod: 1000,
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connectTimeout: 30 * 1000,
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clean: true,
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resubscribe: true
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}
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function defaultId () {
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return 'mqttjs_' + Math.random().toString(16).substr(2, 8)
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}
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function sendPacket (client, packet, cb) {
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client.emit('packetsend', packet)
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var result = mqttPacket.writeToStream(packet, client.stream)
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if (!result && cb) {
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client.stream.once('drain', cb)
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} else if (cb) {
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cb()
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}
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}
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function flush (queue) {
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if (queue) {
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Object.keys(queue).forEach(function (messageId) {
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if (typeof queue[messageId] === 'function') {
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queue[messageId](new Error('Connection closed'))
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delete queue[messageId]
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}
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})
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}
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}
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function storeAndSend (client, packet, cb) {
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client.outgoingStore.put(packet, function storedPacket (err) {
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if (err) {
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return cb && cb(err)
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}
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sendPacket(client, packet, cb)
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})
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}
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function nop () {}
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/**
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* MqttClient constructor
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*
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* @param {Stream} stream - stream
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* @param {Object} [options] - connection options
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* (see Connection#connect)
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*/
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function MqttClient (streamBuilder, options) {
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var k
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var that = this
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if (!(this instanceof MqttClient)) {
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return new MqttClient(streamBuilder, options)
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}
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this.options = options || {}
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// Defaults
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for (k in defaultConnectOptions) {
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if (typeof this.options[k] === 'undefined') {
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this.options[k] = defaultConnectOptions[k]
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} else {
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this.options[k] = options[k]
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}
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}
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this.options.clientId = (typeof this.options.clientId === 'string') ? this.options.clientId : defaultId()
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this.streamBuilder = streamBuilder
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// Inflight message storages
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this.outgoingStore = this.options.outgoingStore || new Store()
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this.incomingStore = this.options.incomingStore || new Store()
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// Should QoS zero messages be queued when the connection is broken?
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this.queueQoSZero = this.options.queueQoSZero === undefined ? true : this.options.queueQoSZero
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// map of subscribed topics to support reconnection
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this._resubscribeTopics = {}
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// map of a subscribe messageId and a topic
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this.messageIdToTopic = {}
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// Ping timer, setup in _setupPingTimer
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this.pingTimer = null
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// Is the client connected?
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this.connected = false
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// Are we disconnecting?
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this.disconnecting = false
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// Packet queue
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this.queue = []
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// connack timer
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this.connackTimer = null
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// Reconnect timer
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this.reconnectTimer = null
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/**
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* MessageIDs starting with 1
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* ensure that nextId is min. 1, see https://github.com/mqttjs/MQTT.js/issues/810
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*/
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this.nextId = Math.max(1, Math.floor(Math.random() * 65535))
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// Inflight callbacks
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this.outgoing = {}
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// Mark connected on connect
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this.on('connect', function () {
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if (this.disconnected) {
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return
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}
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this.connected = true
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var outStore = this.outgoingStore.createStream()
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this.once('close', remove)
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outStore.on('end', function () {
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that.removeListener('close', remove)
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})
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outStore.on('error', function (err) {
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that.removeListener('close', remove)
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that.emit('error', err)
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})
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function remove () {
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outStore.destroy()
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outStore = null
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}
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function storeDeliver () {
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// edge case, we wrapped this twice
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if (!outStore) {
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return
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}
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var packet = outStore.read(1)
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var cb
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if (!packet) {
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// read when data is available in the future
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outStore.once('readable', storeDeliver)
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return
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}
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// Avoid unnecessary stream read operations when disconnected
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if (!that.disconnecting && !that.reconnectTimer) {
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cb = that.outgoing[packet.messageId]
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that.outgoing[packet.messageId] = function (err, status) {
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// Ensure that the original callback passed in to publish gets invoked
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if (cb) {
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cb(err, status)
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}
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storeDeliver()
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}
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that._sendPacket(packet)
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} else if (outStore.destroy) {
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outStore.destroy()
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}
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}
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// start flowing
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storeDeliver()
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})
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// Mark disconnected on stream close
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this.on('close', function () {
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this.connected = false
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clearTimeout(this.connackTimer)
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})
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// Setup ping timer
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this.on('connect', this._setupPingTimer)
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// Send queued packets
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this.on('connect', function () {
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var queue = this.queue
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function deliver () {
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var entry = queue.shift()
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var packet = null
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if (!entry) {
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return
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}
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packet = entry.packet
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that._sendPacket(
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packet,
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function (err) {
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if (entry.cb) {
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entry.cb(err)
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}
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deliver()
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}
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)
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}
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deliver()
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})
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var firstConnection = true
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// resubscribe
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this.on('connect', function () {
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if (!firstConnection &&
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this.options.clean &&
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Object.keys(this._resubscribeTopics).length > 0) {
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if (this.options.resubscribe) {
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this._resubscribeTopics.resubscribe = true
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this.subscribe(this._resubscribeTopics)
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} else {
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this._resubscribeTopics = {}
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}
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}
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firstConnection = false
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})
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// Clear ping timer
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this.on('close', function () {
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if (that.pingTimer !== null) {
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that.pingTimer.clear()
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that.pingTimer = null
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}
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})
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// Setup reconnect timer on disconnect
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this.on('close', this._setupReconnect)
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events.EventEmitter.call(this)
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this._setupStream()
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}
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inherits(MqttClient, events.EventEmitter)
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/**
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* setup the event handlers in the inner stream.
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*
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* @api private
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*/
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MqttClient.prototype._setupStream = function () {
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var connectPacket
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var that = this
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var writable = new Writable()
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var parser = mqttPacket.parser(this.options)
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var completeParse = null
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var packets = []
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this._clearReconnect()
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this.stream = this.streamBuilder(this)
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parser.on('packet', function (packet) {
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packets.push(packet)
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})
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function nextTickWork () {
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process.nextTick(work)
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}
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function work () {
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var packet = packets.shift()
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var done = completeParse
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if (packet) {
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that._handlePacket(packet, nextTickWork)
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} else {
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completeParse = null
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done()
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}
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}
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writable._write = function (buf, enc, done) {
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completeParse = done
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parser.parse(buf)
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work()
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}
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this.stream.pipe(writable)
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// Suppress connection errors
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this.stream.on('error', nop)
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// Echo stream close
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eos(this.stream, this.emit.bind(this, 'close'))
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// Send a connect packet
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connectPacket = Object.create(this.options)
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connectPacket.cmd = 'connect'
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// avoid message queue
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sendPacket(this, connectPacket)
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// Echo connection errors
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parser.on('error', this.emit.bind(this, 'error'))
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// many drain listeners are needed for qos 1 callbacks if the connection is intermittent
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this.stream.setMaxListeners(1000)
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clearTimeout(this.connackTimer)
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this.connackTimer = setTimeout(function () {
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that._cleanUp(true)
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}, this.options.connectTimeout)
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}
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MqttClient.prototype._handlePacket = function (packet, done) {
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this.emit('packetreceive', packet)
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switch (packet.cmd) {
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case 'publish':
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this._handlePublish(packet, done)
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break
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case 'puback':
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case 'pubrec':
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case 'pubcomp':
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case 'suback':
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case 'unsuback':
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this._handleAck(packet)
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done()
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break
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case 'pubrel':
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this._handlePubrel(packet, done)
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break
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case 'connack':
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this._handleConnack(packet)
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done()
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break
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case 'pingresp':
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this._handlePingresp(packet)
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done()
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break
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default:
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// do nothing
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// maybe we should do an error handling
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// or just log it
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break
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}
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}
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MqttClient.prototype._checkDisconnecting = function (callback) {
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if (this.disconnecting) {
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if (callback) {
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callback(new Error('client disconnecting'))
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} else {
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this.emit('error', new Error('client disconnecting'))
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}
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}
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return this.disconnecting
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}
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/**
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* publish - publish <message> to <topic>
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*
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* @param {String} topic - topic to publish to
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* @param {String, Buffer} message - message to publish
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* @param {Object} [opts] - publish options, includes:
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* {Number} qos - qos level to publish on
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* {Boolean} retain - whether or not to retain the message
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* {Boolean} dup - whether or not mark a message as duplicate
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* @param {Function} [callback] - function(err){}
|
* called when publish succeeds or fails
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* @returns {MqttClient} this - for chaining
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* @api public
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*
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* @example client.publish('topic', 'message');
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* @example
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* client.publish('topic', 'message', {qos: 1, retain: true, dup: true});
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* @example client.publish('topic', 'message', console.log);
|
*/
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MqttClient.prototype.publish = function (topic, message, opts, callback) {
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var packet
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// .publish(topic, payload, cb);
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if (typeof opts === 'function') {
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callback = opts
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opts = null
|
}
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// default opts
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var defaultOpts = {qos: 0, retain: false, dup: false}
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opts = xtend(defaultOpts, opts)
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if (this._checkDisconnecting(callback)) {
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return this
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}
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packet = {
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cmd: 'publish',
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topic: topic,
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payload: message,
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qos: opts.qos,
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retain: opts.retain,
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messageId: this._nextId(),
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dup: opts.dup
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}
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switch (opts.qos) {
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case 1:
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case 2:
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// Add to callbacks
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this.outgoing[packet.messageId] = callback || nop
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this._sendPacket(packet)
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break
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default:
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this._sendPacket(packet, callback)
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break
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}
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return this
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}
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/**
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* subscribe - subscribe to <topic>
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*
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* @param {String, Array, Object} topic - topic(s) to subscribe to, supports objects in the form {'topic': qos}
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* @param {Object} [opts] - optional subscription options, includes:
|
* {Number} qos - subscribe qos level
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* @param {Function} [callback] - function(err, granted){} where:
|
* {Error} err - subscription error (none at the moment!)
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* {Array} granted - array of {topic: 't', qos: 0}
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* @returns {MqttClient} this - for chaining
|
* @api public
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* @example client.subscribe('topic');
|
* @example client.subscribe('topic', {qos: 1});
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* @example client.subscribe({'topic': 0, 'topic2': 1}, console.log);
|
* @example client.subscribe('topic', console.log);
|
*/
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MqttClient.prototype.subscribe = function () {
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var packet
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var args = Array.prototype.slice.call(arguments)
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var subs = []
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var obj = args.shift()
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var resubscribe = obj.resubscribe
|
var callback = args.pop() || nop
|
var opts = args.pop()
|
var invalidTopic
|
var that = this
|
|
delete obj.resubscribe
|
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if (typeof obj === 'string') {
|
obj = [obj]
|
}
|
|
if (typeof callback !== 'function') {
|
opts = callback
|
callback = nop
|
}
|
|
invalidTopic = validations.validateTopics(obj)
|
if (invalidTopic !== null) {
|
setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
|
return this
|
}
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|
if (this._checkDisconnecting(callback)) {
|
return this
|
}
|
|
var defaultOpts = { qos: 0 }
|
opts = xtend(defaultOpts, opts)
|
|
if (Array.isArray(obj)) {
|
obj.forEach(function (topic) {
|
if (that._resubscribeTopics[topic] < opts.qos ||
|
!that._resubscribeTopics.hasOwnProperty(topic) ||
|
resubscribe) {
|
subs.push({
|
topic: topic,
|
qos: opts.qos
|
})
|
}
|
})
|
} else {
|
Object
|
.keys(obj)
|
.forEach(function (k) {
|
if (that._resubscribeTopics[k] < obj[k] ||
|
!that._resubscribeTopics.hasOwnProperty(k) ||
|
resubscribe) {
|
subs.push({
|
topic: k,
|
qos: obj[k]
|
})
|
}
|
})
|
}
|
|
packet = {
|
cmd: 'subscribe',
|
subscriptions: subs,
|
qos: 1,
|
retain: false,
|
dup: false,
|
messageId: this._nextId()
|
}
|
|
if (!subs.length) {
|
callback(null, [])
|
return
|
}
|
|
// subscriptions to resubscribe to in case of disconnect
|
if (this.options.resubscribe) {
|
var topics = []
|
subs.forEach(function (sub) {
|
if (that.options.reconnectPeriod > 0) {
|
that._resubscribeTopics[sub.topic] = sub.qos
|
topics.push(sub.topic)
|
}
|
})
|
that.messageIdToTopic[packet.messageId] = topics
|
}
|
|
this.outgoing[packet.messageId] = function (err, packet) {
|
if (!err) {
|
var granted = packet.granted
|
for (var i = 0; i < granted.length; i += 1) {
|
subs[i].qos = granted[i]
|
}
|
}
|
|
callback(err, subs)
|
}
|
|
this._sendPacket(packet)
|
|
return this
|
}
|
|
/**
|
* unsubscribe - unsubscribe from topic(s)
|
*
|
* @param {String, Array} topic - topics to unsubscribe from
|
* @param {Function} [callback] - callback fired on unsuback
|
* @returns {MqttClient} this - for chaining
|
* @api public
|
* @example client.unsubscribe('topic');
|
* @example client.unsubscribe('topic', console.log);
|
*/
|
MqttClient.prototype.unsubscribe = function (topic, callback) {
|
var packet = {
|
cmd: 'unsubscribe',
|
qos: 1,
|
messageId: this._nextId()
|
}
|
var that = this
|
|
callback = callback || nop
|
|
if (this._checkDisconnecting(callback)) {
|
return this
|
}
|
|
if (typeof topic === 'string') {
|
packet.unsubscriptions = [topic]
|
} else if (typeof topic === 'object' && topic.length) {
|
packet.unsubscriptions = topic
|
}
|
|
if (this.options.resubscribe) {
|
packet.unsubscriptions.forEach(function (topic) {
|
delete that._resubscribeTopics[topic]
|
})
|
}
|
|
this.outgoing[packet.messageId] = callback
|
|
this._sendPacket(packet)
|
|
return this
|
}
|
|
/**
|
* end - close connection
|
*
|
* @returns {MqttClient} this - for chaining
|
* @param {Boolean} force - do not wait for all in-flight messages to be acked
|
* @param {Function} cb - called when the client has been closed
|
*
|
* @api public
|
*/
|
MqttClient.prototype.end = function (force, cb) {
|
var that = this
|
|
if (typeof force === 'function') {
|
cb = force
|
force = false
|
}
|
|
function closeStores () {
|
that.disconnected = true
|
that.incomingStore.close(function () {
|
that.outgoingStore.close(function () {
|
if (cb) {
|
cb.apply(null, arguments)
|
}
|
that.emit('end')
|
})
|
})
|
if (that._deferredReconnect) {
|
that._deferredReconnect()
|
}
|
}
|
|
function finish () {
|
// defer closesStores of an I/O cycle,
|
// just to make sure things are
|
// ok for websockets
|
that._cleanUp(force, setImmediate.bind(null, closeStores))
|
}
|
|
if (this.disconnecting) {
|
return this
|
}
|
|
this._clearReconnect()
|
|
this.disconnecting = true
|
|
if (!force && Object.keys(this.outgoing).length > 0) {
|
// wait 10ms, just to be sure we received all of it
|
this.once('outgoingEmpty', setTimeout.bind(null, finish, 10))
|
} else {
|
finish()
|
}
|
|
return this
|
}
|
|
/**
|
* removeOutgoingMessage - remove a message in outgoing store
|
* the outgoing callback will be called withe Error('Message removed') if the message is removed
|
*
|
* @param {Number} mid - messageId to remove message
|
* @returns {MqttClient} this - for chaining
|
* @api public
|
*
|
* @example client.removeOutgoingMessage(client.getLastMessageId());
|
*/
|
MqttClient.prototype.removeOutgoingMessage = function (mid) {
|
var cb = this.outgoing[mid]
|
delete this.outgoing[mid]
|
this.outgoingStore.del({messageId: mid}, function () {
|
cb(new Error('Message removed'))
|
})
|
return this
|
}
|
|
/**
|
* reconnect - connect again using the same options as connect()
|
*
|
* @param {Object} [opts] - optional reconnect options, includes:
|
* {Store} incomingStore - a store for the incoming packets
|
* {Store} outgoingStore - a store for the outgoing packets
|
* if opts is not given, current stores are used
|
* @returns {MqttClient} this - for chaining
|
*
|
* @api public
|
*/
|
MqttClient.prototype.reconnect = function (opts) {
|
var that = this
|
var f = function () {
|
if (opts) {
|
that.options.incomingStore = opts.incomingStore
|
that.options.outgoingStore = opts.outgoingStore
|
} else {
|
that.options.incomingStore = null
|
that.options.outgoingStore = null
|
}
|
that.incomingStore = that.options.incomingStore || new Store()
|
that.outgoingStore = that.options.outgoingStore || new Store()
|
that.disconnecting = false
|
that.disconnected = false
|
that._deferredReconnect = null
|
that._reconnect()
|
}
|
|
if (this.disconnecting && !this.disconnected) {
|
this._deferredReconnect = f
|
} else {
|
f()
|
}
|
return this
|
}
|
|
/**
|
* _reconnect - implement reconnection
|
* @api privateish
|
*/
|
MqttClient.prototype._reconnect = function () {
|
this.emit('reconnect')
|
this._setupStream()
|
}
|
|
/**
|
* _setupReconnect - setup reconnect timer
|
*/
|
MqttClient.prototype._setupReconnect = function () {
|
var that = this
|
|
if (!that.disconnecting && !that.reconnectTimer && (that.options.reconnectPeriod > 0)) {
|
if (!this.reconnecting) {
|
this.emit('offline')
|
this.reconnecting = true
|
}
|
that.reconnectTimer = setInterval(function () {
|
that._reconnect()
|
}, that.options.reconnectPeriod)
|
}
|
}
|
|
/**
|
* _clearReconnect - clear the reconnect timer
|
*/
|
MqttClient.prototype._clearReconnect = function () {
|
if (this.reconnectTimer) {
|
clearInterval(this.reconnectTimer)
|
this.reconnectTimer = null
|
}
|
}
|
|
/**
|
* _cleanUp - clean up on connection end
|
* @api private
|
*/
|
MqttClient.prototype._cleanUp = function (forced, done) {
|
if (done) {
|
this.stream.on('close', done)
|
}
|
|
if (forced) {
|
if ((this.options.reconnectPeriod === 0) && this.options.clean) {
|
flush(this.outgoing)
|
}
|
this.stream.destroy()
|
} else {
|
this._sendPacket(
|
{ cmd: 'disconnect' },
|
setImmediate.bind(
|
null,
|
this.stream.end.bind(this.stream)
|
)
|
)
|
}
|
|
if (!this.disconnecting) {
|
this._clearReconnect()
|
this._setupReconnect()
|
}
|
|
if (this.pingTimer !== null) {
|
this.pingTimer.clear()
|
this.pingTimer = null
|
}
|
|
if (done && !this.connected) {
|
this.stream.removeListener('close', done)
|
done()
|
}
|
}
|
|
/**
|
* _sendPacket - send or queue a packet
|
* @param {String} type - packet type (see `protocol`)
|
* @param {Object} packet - packet options
|
* @param {Function} cb - callback when the packet is sent
|
* @api private
|
*/
|
MqttClient.prototype._sendPacket = function (packet, cb) {
|
if (!this.connected) {
|
if (((packet.qos || 0) === 0 && this.queueQoSZero) || packet.cmd !== 'publish') {
|
this.queue.push({ packet: packet, cb: cb })
|
} else if (packet.qos > 0) {
|
cb = this.outgoing[packet.messageId]
|
this.outgoingStore.put(packet, function (err) {
|
if (err) {
|
return cb && cb(err)
|
}
|
})
|
} else if (cb) {
|
cb(new Error('No connection to broker'))
|
}
|
|
return
|
}
|
|
// When sending a packet, reschedule the ping timer
|
this._shiftPingInterval()
|
|
switch (packet.cmd) {
|
case 'publish':
|
break
|
case 'pubrel':
|
storeAndSend(this, packet, cb)
|
return
|
default:
|
sendPacket(this, packet, cb)
|
return
|
}
|
|
switch (packet.qos) {
|
case 2:
|
case 1:
|
storeAndSend(this, packet, cb)
|
break
|
/**
|
* no need of case here since it will be caught by default
|
* and jshint comply that before default it must be a break
|
* anyway it will result in -1 evaluation
|
*/
|
case 0:
|
/* falls through */
|
default:
|
sendPacket(this, packet, cb)
|
break
|
}
|
}
|
|
/**
|
* _setupPingTimer - setup the ping timer
|
*
|
* @api private
|
*/
|
MqttClient.prototype._setupPingTimer = function () {
|
var that = this
|
|
if (!this.pingTimer && this.options.keepalive) {
|
this.pingResp = true
|
this.pingTimer = reInterval(function () {
|
that._checkPing()
|
}, this.options.keepalive * 1000)
|
}
|
}
|
|
/**
|
* _shiftPingInterval - reschedule the ping interval
|
*
|
* @api private
|
*/
|
MqttClient.prototype._shiftPingInterval = function () {
|
if (this.pingTimer && this.options.keepalive && this.options.reschedulePings) {
|
this.pingTimer.reschedule(this.options.keepalive * 1000)
|
}
|
}
|
/**
|
* _checkPing - check if a pingresp has come back, and ping the server again
|
*
|
* @api private
|
*/
|
MqttClient.prototype._checkPing = function () {
|
if (this.pingResp) {
|
this.pingResp = false
|
this._sendPacket({ cmd: 'pingreq' })
|
} else {
|
// do a forced cleanup since socket will be in bad shape
|
this._cleanUp(true)
|
}
|
}
|
|
/**
|
* _handlePingresp - handle a pingresp
|
*
|
* @api private
|
*/
|
MqttClient.prototype._handlePingresp = function () {
|
this.pingResp = true
|
}
|
|
/**
|
* _handleConnack
|
*
|
* @param {Object} packet
|
* @api private
|
*/
|
|
MqttClient.prototype._handleConnack = function (packet) {
|
var rc = packet.returnCode
|
var errors = [
|
'',
|
'Unacceptable protocol version',
|
'Identifier rejected',
|
'Server unavailable',
|
'Bad username or password',
|
'Not authorized'
|
]
|
|
clearTimeout(this.connackTimer)
|
|
if (rc === 0) {
|
this.reconnecting = false
|
this.emit('connect', packet)
|
} else if (rc > 0) {
|
var err = new Error('Connection refused: ' + errors[rc])
|
err.code = rc
|
this.emit('error', err)
|
}
|
}
|
|
/**
|
* _handlePublish
|
*
|
* @param {Object} packet
|
* @api private
|
*/
|
/*
|
those late 2 case should be rewrite to comply with coding style:
|
|
case 1:
|
case 0:
|
// do not wait sending a puback
|
// no callback passed
|
if (1 === qos) {
|
this._sendPacket({
|
cmd: 'puback',
|
messageId: mid
|
});
|
}
|
// emit the message event for both qos 1 and 0
|
this.emit('message', topic, message, packet);
|
this.handleMessage(packet, done);
|
break;
|
default:
|
// do nothing but every switch mus have a default
|
// log or throw an error about unknown qos
|
break;
|
|
for now i just suppressed the warnings
|
*/
|
MqttClient.prototype._handlePublish = function (packet, done) {
|
done = typeof done !== 'undefined' ? done : nop
|
var topic = packet.topic.toString()
|
var message = packet.payload
|
var qos = packet.qos
|
var mid = packet.messageId
|
var that = this
|
|
switch (qos) {
|
case 2:
|
this.incomingStore.put(packet, function (err) {
|
if (err) {
|
return done(err)
|
}
|
that._sendPacket({cmd: 'pubrec', messageId: mid}, done)
|
})
|
break
|
case 1:
|
// emit the message event
|
this.emit('message', topic, message, packet)
|
this.handleMessage(packet, function (err) {
|
if (err) {
|
return done(err)
|
}
|
// send 'puback' if the above 'handleMessage' method executed
|
// successfully.
|
that._sendPacket({cmd: 'puback', messageId: mid}, done)
|
})
|
break
|
case 0:
|
// emit the message event
|
this.emit('message', topic, message, packet)
|
this.handleMessage(packet, done)
|
break
|
default:
|
// do nothing
|
// log or throw an error about unknown qos
|
break
|
}
|
}
|
|
/**
|
* Handle messages with backpressure support, one at a time.
|
* Override at will.
|
*
|
* @param Packet packet the packet
|
* @param Function callback call when finished
|
* @api public
|
*/
|
MqttClient.prototype.handleMessage = function (packet, callback) {
|
callback()
|
}
|
|
/**
|
* _handleAck
|
*
|
* @param {Object} packet
|
* @api private
|
*/
|
|
MqttClient.prototype._handleAck = function (packet) {
|
/* eslint no-fallthrough: "off" */
|
var mid = packet.messageId
|
var type = packet.cmd
|
var response = null
|
var cb = this.outgoing[mid]
|
var that = this
|
|
if (!cb) {
|
// Server sent an ack in error, ignore it.
|
return
|
}
|
|
// Process
|
switch (type) {
|
case 'pubcomp':
|
// same thing as puback for QoS 2
|
case 'puback':
|
// Callback - we're done
|
delete this.outgoing[mid]
|
this.outgoingStore.del(packet, cb)
|
break
|
case 'pubrec':
|
response = {
|
cmd: 'pubrel',
|
qos: 2,
|
messageId: mid
|
}
|
|
this._sendPacket(response)
|
break
|
case 'suback':
|
delete this.outgoing[mid]
|
if (packet.granted.length === 1 && (packet.granted[0] & 0x80) !== 0) {
|
// suback with Failure status
|
var topics = this.messageIdToTopic[mid]
|
if (topics) {
|
topics.forEach(function (topic) {
|
delete that._resubscribeTopics[topic]
|
})
|
}
|
}
|
cb(null, packet)
|
break
|
case 'unsuback':
|
delete this.outgoing[mid]
|
cb(null)
|
break
|
default:
|
that.emit('error', new Error('unrecognized packet type'))
|
}
|
|
if (this.disconnecting &&
|
Object.keys(this.outgoing).length === 0) {
|
this.emit('outgoingEmpty')
|
}
|
}
|
|
/**
|
* _handlePubrel
|
*
|
* @param {Object} packet
|
* @api private
|
*/
|
MqttClient.prototype._handlePubrel = function (packet, callback) {
|
callback = typeof callback !== 'undefined' ? callback : nop
|
var mid = packet.messageId
|
var that = this
|
|
var comp = {cmd: 'pubcomp', messageId: mid}
|
|
that.incomingStore.get(packet, function (err, pub) {
|
if (!err && pub.cmd !== 'pubrel') {
|
that.emit('message', pub.topic, pub.payload, pub)
|
that.incomingStore.put(packet, function (err) {
|
if (err) {
|
return callback(err)
|
}
|
that.handleMessage(pub, function (err) {
|
if (err) {
|
return callback(err)
|
}
|
that._sendPacket(comp, callback)
|
})
|
})
|
} else {
|
that._sendPacket(comp, callback)
|
}
|
})
|
}
|
|
/**
|
* _nextId
|
* @return unsigned int
|
*/
|
MqttClient.prototype._nextId = function () {
|
// id becomes current state of this.nextId and increments afterwards
|
var id = this.nextId++
|
// Ensure 16 bit unsigned int (max 65535, nextId got one higher)
|
if (this.nextId === 65536) {
|
this.nextId = 1
|
}
|
return id
|
}
|
|
/**
|
* getLastMessageId
|
* @return unsigned int
|
*/
|
MqttClient.prototype.getLastMessageId = function () {
|
return (this.nextId === 1) ? 65535 : (this.nextId - 1)
|
}
|
|
module.exports = MqttClient
|
