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client.js
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'use strict'
/**
* Module dependencies
*/
const EventEmitter = require('events').EventEmitter
const Store = require('./store')
const TopicAliasRecv = require('./topic-alias-recv')
const TopicAliasSend = require('./topic-alias-send')
const mqttPacket = require('mqtt-packet')
const DefaultMessageIdProvider = require('./default-message-id-provider')
const Writable = require('readable-stream').Writable
const inherits = require('inherits')
const reInterval = require('reinterval')
const clone = require('rfdc/default')
const validations = require('./validations')
const xtend = require('xtend')
const debug = require('debug')('mqttjs:client')
const nextTick = process ? process.nextTick : function (callback) { setTimeout(callback, 0) }
const setImmediate = global.setImmediate || function (callback) {
// works in node v0.8
nextTick(callback)
}
const defaultConnectOptions = {
keepalive: 60,
reschedulePings: true,
protocolId: 'MQTT',
protocolVersion: 4,
reconnectPeriod: 1000,
connectTimeout: 30 * 1000,
clean: true,
resubscribe: true
}
const socketErrors = [
'ECONNREFUSED',
'EADDRINUSE',
'ECONNRESET',
'ENOTFOUND'
]
// Other Socket Errors: EADDRINUSE, ECONNRESET, ENOTFOUND.
const errors = {
0: '',
1: 'Unacceptable protocol version',
2: 'Identifier rejected',
3: 'Server unavailable',
4: 'Bad username or password',
5: 'Not authorized',
16: 'No matching subscribers',
17: 'No subscription existed',
128: 'Unspecified error',
129: 'Malformed Packet',
130: 'Protocol Error',
131: 'Implementation specific error',
132: 'Unsupported Protocol Version',
133: 'Client Identifier not valid',
134: 'Bad User Name or Password',
135: 'Not authorized',
136: 'Server unavailable',
137: 'Server busy',
138: 'Banned',
139: 'Server shutting down',
140: 'Bad authentication method',
141: 'Keep Alive timeout',
142: 'Session taken over',
143: 'Topic Filter invalid',
144: 'Topic Name invalid',
145: 'Packet identifier in use',
146: 'Packet Identifier not found',
147: 'Receive Maximum exceeded',
148: 'Topic Alias invalid',
149: 'Packet too large',
150: 'Message rate too high',
151: 'Quota exceeded',
152: 'Administrative action',
153: 'Payload format invalid',
154: 'Retain not supported',
155: 'QoS not supported',
156: 'Use another server',
157: 'Server moved',
158: 'Shared Subscriptions not supported',
159: 'Connection rate exceeded',
160: 'Maximum connect time',
161: 'Subscription Identifiers not supported',
162: 'Wildcard Subscriptions not supported'
}
function defaultId () {
return 'mqttjs_' + Math.random().toString(16).substr(2, 8)
}
function applyTopicAlias (client, packet) {
if (client.options.protocolVersion === 5) {
if (packet.cmd === 'publish') {
let alias
if (packet.properties) {
alias = packet.properties.topicAlias
}
const topic = packet.topic.toString()
if (client.topicAliasSend) {
if (alias) {
if (topic.length !== 0) {
// register topic alias
debug('applyTopicAlias :: register topic: %s - alias: %d', topic, alias)
if (!client.topicAliasSend.put(topic, alias)) {
debug('applyTopicAlias :: error out of range. topic: %s - alias: %d', topic, alias)
return new Error('Sending Topic Alias out of range')
}
}
} else {
if (topic.length !== 0) {
if (client.options.autoAssignTopicAlias) {
alias = client.topicAliasSend.getAliasByTopic(topic)
if (alias) {
packet.topic = ''
packet.properties = { ...(packet.properties), topicAlias: alias }
debug('applyTopicAlias :: auto assign(use) topic: %s - alias: %d', topic, alias)
} else {
alias = client.topicAliasSend.getLruAlias()
client.topicAliasSend.put(topic, alias)
packet.properties = { ...(packet.properties), topicAlias: alias }
debug('applyTopicAlias :: auto assign topic: %s - alias: %d', topic, alias)
}
} else if (client.options.autoUseTopicAlias) {
alias = client.topicAliasSend.getAliasByTopic(topic)
if (alias) {
packet.topic = ''
packet.properties = { ...(packet.properties), topicAlias: alias }
debug('applyTopicAlias :: auto use topic: %s - alias: %d', topic, alias)
}
}
}
}
} else if (alias) {
debug('applyTopicAlias :: error out of range. topic: %s - alias: %d', topic, alias)
return new Error('Sending Topic Alias out of range')
}
}
}
}
function removeTopicAliasAndRecoverTopicName (client, packet) {
let alias
if (packet.properties) {
alias = packet.properties.topicAlias
}
let topic = packet.topic.toString()
if (topic.length === 0) {
// restore topic from alias
if (typeof alias === 'undefined') {
return new Error('Unregistered Topic Alias')
} else {
topic = client.topicAliasSend.getTopicByAlias(alias)
if (typeof topic === 'undefined') {
return new Error('Unregistered Topic Alias')
} else {
packet.topic = topic
}
}
}
if (alias) {
delete packet.properties.topicAlias
}
}
function sendPacket (client, packet, cb) {
debug('sendPacket :: packet: %O', packet)
debug('sendPacket :: emitting `packetsend`')
client.emit('packetsend', packet)
debug('sendPacket :: writing to stream')
const result = mqttPacket.writeToStream(packet, client.stream, client.options)
debug('sendPacket :: writeToStream result %s', result)
if (!result && cb && cb !== nop) {
debug('sendPacket :: handle events on `drain` once through callback.')
client.stream.once('drain', cb)
} else if (cb) {
debug('sendPacket :: invoking cb')
cb()
}
}
function flush (queue) {
if (queue) {
debug('flush: queue exists? %b', !!(queue))
Object.keys(queue).forEach(function (messageId) {
if (typeof queue[messageId].cb === 'function') {
queue[messageId].cb(new Error('Connection closed'))
// This is suspicious. Why do we only delete this if we have a callbck?
// If this is by-design, then adding no as callback would cause this to get deleted unintentionally.
delete queue[messageId]
}
})
}
}
function flushVolatile (queue) {
if (queue) {
debug('flushVolatile :: deleting volatile messages from the queue and setting their callbacks as error function')
Object.keys(queue).forEach(function (messageId) {
if (queue[messageId].volatile && typeof queue[messageId].cb === 'function') {
queue[messageId].cb(new Error('Connection closed'))
delete queue[messageId]
}
})
}
}
function storeAndSend (client, packet, cb, cbStorePut) {
debug('storeAndSend :: store packet with cmd %s to outgoingStore', packet.cmd)
let storePacket = packet
let err
if (storePacket.cmd === 'publish') {
// The original packet is for sending.
// The cloned storePacket is for storing to resend on reconnect.
// Topic Alias must not be used after disconnected.
storePacket = clone(packet)
err = removeTopicAliasAndRecoverTopicName(client, storePacket)
if (err) {
return cb && cb(err)
}
}
client.outgoingStore.put(storePacket, function storedPacket (err) {
if (err) {
return cb && cb(err)
}
cbStorePut()
sendPacket(client, packet, cb)
})
}
function nop (error) {
debug('nop ::', error)
}
/**
* MqttClient constructor
*
* @param {Stream} stream - stream
* @param {Object} [options] - connection options
* (see Connection#connect)
*/
function MqttClient (streamBuilder, options) {
let k
const that = this
if (!(this instanceof MqttClient)) {
return new MqttClient(streamBuilder, options)
}
this.options = options || {}
// Defaults
for (k in defaultConnectOptions) {
if (typeof this.options[k] === 'undefined') {
this.options[k] = defaultConnectOptions[k]
} else {
this.options[k] = options[k]
}
}
debug('MqttClient :: options.protocol', options.protocol)
debug('MqttClient :: options.protocolVersion', options.protocolVersion)
debug('MqttClient :: options.username', options.username)
debug('MqttClient :: options.keepalive', options.keepalive)
debug('MqttClient :: options.reconnectPeriod', options.reconnectPeriod)
debug('MqttClient :: options.rejectUnauthorized', options.rejectUnauthorized)
debug('MqttClient :: options.topicAliasMaximum', options.topicAliasMaximum)
this.options.clientId = (typeof options.clientId === 'string') ? options.clientId : defaultId()
debug('MqttClient :: clientId', this.options.clientId)
this.options.customHandleAcks = (options.protocolVersion === 5 && options.customHandleAcks) ? options.customHandleAcks : function () { arguments[3](0) }
this.streamBuilder = streamBuilder
this.messageIdProvider = (typeof this.options.messageIdProvider === 'undefined') ? new DefaultMessageIdProvider() : this.options.messageIdProvider
// Inflight message storages
this.outgoingStore = options.outgoingStore || new Store()
this.incomingStore = options.incomingStore || new Store()
// Should QoS zero messages be queued when the connection is broken?
this.queueQoSZero = options.queueQoSZero === undefined ? true : options.queueQoSZero
// map of subscribed topics to support reconnection
this._resubscribeTopics = {}
// map of a subscribe messageId and a topic
this.messageIdToTopic = {}
// Ping timer, setup in _setupPingTimer
this.pingTimer = null
// Is the client connected?
this.connected = false
// Are we disconnecting?
this.disconnecting = false
// Packet queue
this.queue = []
// connack timer
this.connackTimer = null
// Reconnect timer
this.reconnectTimer = null
// Is processing store?
this._storeProcessing = false
// Packet Ids are put into the store during store processing
this._packetIdsDuringStoreProcessing = {}
// Store processing queue
this._storeProcessingQueue = []
// Inflight callbacks
this.outgoing = {}
// True if connection is first time.
this._firstConnection = true
if (options.topicAliasMaximum > 0) {
if (options.topicAliasMaximum > 0xffff) {
debug('MqttClient :: options.topicAliasMaximum is out of range')
} else {
this.topicAliasRecv = new TopicAliasRecv(options.topicAliasMaximum)
}
}
// Send queued packets
this.on('connect', function () {
const queue = this.queue
function deliver () {
const entry = queue.shift()
debug('deliver :: entry %o', entry)
let packet = null
if (!entry) {
that._resubscribe()
return
}
packet = entry.packet
debug('deliver :: call _sendPacket for %o', packet)
let send = true
if (packet.messageId && packet.messageId !== 0) {
if (!that.messageIdProvider.register(packet.messageId)) {
send = false
}
}
if (send) {
that._sendPacket(
packet,
function (err) {
if (entry.cb) {
entry.cb(err)
}
deliver()
}
)
} else {
debug('messageId: %d has already used. The message is skipped and removed.', packet.messageId)
deliver()
}
}
debug('connect :: sending queued packets')
deliver()
})
this.on('close', function () {
debug('close :: connected set to `false`')
this.connected = false
debug('close :: clearing connackTimer')
clearTimeout(this.connackTimer)
debug('close :: clearing ping timer')
if (that.pingTimer !== null) {
that.pingTimer.clear()
that.pingTimer = null
}
if (this.topicAliasRecv) {
this.topicAliasRecv.clear()
}
debug('close :: calling _setupReconnect')
this._setupReconnect()
})
EventEmitter.call(this)
debug('MqttClient :: setting up stream')
this._setupStream()
}
inherits(MqttClient, EventEmitter)
/**
* setup the event handlers in the inner stream.
*
* @api private
*/
MqttClient.prototype._setupStream = function () {
const that = this
const writable = new Writable()
const parser = mqttPacket.parser(this.options)
let completeParse = null
const packets = []
debug('_setupStream :: calling method to clear reconnect')
this._clearReconnect()
debug('_setupStream :: using streamBuilder provided to client to create stream')
this.stream = this.streamBuilder(this)
parser.on('packet', function (packet) {
debug('parser :: on packet push to packets array.')
packets.push(packet)
})
function nextTickWork () {
if (packets.length) {
nextTick(work)
} else {
const done = completeParse
completeParse = null
done()
}
}
function work () {
debug('work :: getting next packet in queue')
const packet = packets.shift()
if (packet) {
debug('work :: packet pulled from queue')
that._handlePacket(packet, nextTickWork)
} else {
debug('work :: no packets in queue')
const done = completeParse
completeParse = null
debug('work :: done flag is %s', !!(done))
if (done) done()
}
}
writable._write = function (buf, enc, done) {
completeParse = done
debug('writable stream :: parsing buffer')
parser.parse(buf)
work()
}
function streamErrorHandler (error) {
debug('streamErrorHandler :: error', error.message)
if (socketErrors.includes(error.code)) {
// handle error
debug('streamErrorHandler :: emitting error')
that.emit('error', error)
} else {
nop(error)
}
}
debug('_setupStream :: pipe stream to writable stream')
this.stream.pipe(writable)
// Suppress connection errors
this.stream.on('error', streamErrorHandler)
// Echo stream close
this.stream.on('close', function () {
debug('(%s)stream :: on close', that.options.clientId)
flushVolatile(that.outgoing)
debug('stream: emit close to MqttClient')
that.emit('close')
})
// Send a connect packet
debug('_setupStream: sending packet `connect`')
const connectPacket = Object.create(this.options)
connectPacket.cmd = 'connect'
if (this.topicAliasRecv) {
if (!connectPacket.properties) {
connectPacket.properties = {}
}
if (this.topicAliasRecv) {
connectPacket.properties.topicAliasMaximum = this.topicAliasRecv.max
}
}
// avoid message queue
sendPacket(this, connectPacket)
// Echo connection errors
parser.on('error', this.emit.bind(this, 'error'))
// auth
if (this.options.properties) {
if (!this.options.properties.authenticationMethod && this.options.properties.authenticationData) {
that.end(() =>
this.emit('error', new Error('Packet has no Authentication Method')
))
return this
}
if (this.options.properties.authenticationMethod && this.options.authPacket && typeof this.options.authPacket === 'object') {
const authPacket = xtend({ cmd: 'auth', reasonCode: 0 }, this.options.authPacket)
sendPacket(this, authPacket)
}
}
// many drain listeners are needed for qos 1 callbacks if the connection is intermittent
this.stream.setMaxListeners(1000)
clearTimeout(this.connackTimer)
this.connackTimer = setTimeout(function () {
debug('!!connectTimeout hit!! Calling _cleanUp with force `true`')
that._cleanUp(true)
}, this.options.connectTimeout)
}
MqttClient.prototype._handlePacket = function (packet, done) {
const options = this.options
if (options.protocolVersion === 5 && options.properties && options.properties.maximumPacketSize && options.properties.maximumPacketSize < packet.length) {
this.emit('error', new Error('exceeding packets size ' + packet.cmd))
this.end({ reasonCode: 149, properties: { reasonString: 'Maximum packet size was exceeded' } })
return this
}
debug('_handlePacket :: emitting packetreceive')
this.emit('packetreceive', packet)
switch (packet.cmd) {
case 'publish':
this._handlePublish(packet, done)
break
case 'puback':
case 'pubrec':
case 'pubcomp':
case 'suback':
case 'unsuback':
this._handleAck(packet)
done()
break
case 'pubrel':
this._handlePubrel(packet, done)
break
case 'connack':
this._handleConnack(packet)
done()
break
case 'auth':
this._handleAuth(packet)
done()
break
case 'pingresp':
this._handlePingresp(packet)
done()
break
case 'disconnect':
this._handleDisconnect(packet)
done()
break
default:
// do nothing
// maybe we should do an error handling
// or just log it
break
}
}
MqttClient.prototype._checkDisconnecting = function (callback) {
if (this.disconnecting) {
if (callback && callback !== nop) {
callback(new Error('client disconnecting'))
} else {
this.emit('error', new Error('client disconnecting'))
}
}
return this.disconnecting
}
/**
* publish - publish <message> to <topic>
*
* @param {String} topic - topic to publish to
* @param {String, Buffer} message - message to publish
* @param {Object} [opts] - publish options, includes:
* {Number} qos - qos level to publish on
* {Boolean} retain - whether or not to retain the message
* {Boolean} dup - whether or not mark a message as duplicate
* {Function} cbStorePut - function(){} called when message is put into `outgoingStore`
* @param {Function} [callback] - function(err){}
* called when publish succeeds or fails
* @returns {MqttClient} this - for chaining
* @api public
*
* @example client.publish('topic', 'message');
* @example
* client.publish('topic', 'message', {qos: 1, retain: true, dup: true});
* @example client.publish('topic', 'message', console.log);
*/
MqttClient.prototype.publish = function (topic, message, opts, callback) {
debug('publish :: message `%s` to topic `%s`', message, topic)
const options = this.options
// .publish(topic, payload, cb);
if (typeof opts === 'function') {
callback = opts
opts = null
}
// default opts
const defaultOpts = { qos: 0, retain: false, dup: false }
opts = xtend(defaultOpts, opts)
if (this._checkDisconnecting(callback)) {
return this
}
const that = this
const publishProc = function () {
let messageId = 0
if (opts.qos === 1 || opts.qos === 2) {
messageId = that._nextId()
if (messageId === null) {
debug('No messageId left')
return false
}
}
const packet = {
cmd: 'publish',
topic: topic,
payload: message,
qos: opts.qos,
retain: opts.retain,
messageId: messageId,
dup: opts.dup
}
if (options.protocolVersion === 5) {
packet.properties = opts.properties
}
debug('publish :: qos', opts.qos)
switch (opts.qos) {
case 1:
case 2:
// Add to callbacks
that.outgoing[packet.messageId] = {
volatile: false,
cb: callback || nop
}
debug('MqttClient:publish: packet cmd: %s', packet.cmd)
that._sendPacket(packet, undefined, opts.cbStorePut)
break
default:
debug('MqttClient:publish: packet cmd: %s', packet.cmd)
that._sendPacket(packet, callback, opts.cbStorePut)
break
}
return true
}
if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !publishProc()) {
this._storeProcessingQueue.push(
{
invoke: publishProc,
cbStorePut: opts.cbStorePut,
callback: callback
}
)
}
return this
}
/**
* subscribe - subscribe to <topic>
*
* @param {String, Array, Object} topic - topic(s) to subscribe to, supports objects in the form {'topic': qos}
* @param {Object} [opts] - optional subscription options, includes:
* {Number} qos - subscribe qos level
* @param {Function} [callback] - function(err, granted){} where:
* {Error} err - subscription error (none at the moment!)
* {Array} granted - array of {topic: 't', qos: 0}
* @returns {MqttClient} this - for chaining
* @api public
* @example client.subscribe('topic');
* @example client.subscribe('topic', {qos: 1});
* @example client.subscribe({'topic': {qos: 0}, 'topic2': {qos: 1}}, console.log);
* @example client.subscribe('topic', console.log);
*/
MqttClient.prototype.subscribe = function () {
const that = this
const args = new Array(arguments.length)
for (let i = 0; i < arguments.length; i++) {
args[i] = arguments[i]
}
const subs = []
let obj = args.shift()
const resubscribe = obj.resubscribe
let callback = args.pop() || nop
let opts = args.pop()
const version = this.options.protocolVersion
delete obj.resubscribe
if (typeof obj === 'string') {
obj = [obj]
}
if (typeof callback !== 'function') {
opts = callback
callback = nop
}
const invalidTopic = validations.validateTopics(obj)
if (invalidTopic !== null) {
setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
return this
}
if (this._checkDisconnecting(callback)) {
debug('subscribe: discconecting true')
return this
}
const defaultOpts = {
qos: 0
}
if (version === 5) {
defaultOpts.nl = false
defaultOpts.rap = false
defaultOpts.rh = 0
}
opts = xtend(defaultOpts, opts)
if (Array.isArray(obj)) {
obj.forEach(function (topic) {
debug('subscribe: array topic %s', topic)
if (!Object.prototype.hasOwnProperty.call(that._resubscribeTopics, topic) ||
that._resubscribeTopics[topic].qos < opts.qos ||
resubscribe) {
const currentOpts = {
topic: topic,
qos: opts.qos
}
if (version === 5) {
currentOpts.nl = opts.nl
currentOpts.rap = opts.rap
currentOpts.rh = opts.rh
currentOpts.properties = opts.properties
}
debug('subscribe: pushing topic `%s` and qos `%s` to subs list', currentOpts.topic, currentOpts.qos)
subs.push(currentOpts)
}
})
} else {
Object
.keys(obj)
.forEach(function (k) {
debug('subscribe: object topic %s', k)
if (!Object.prototype.hasOwnProperty.call(that._resubscribeTopics, k) ||
that._resubscribeTopics[k].qos < obj[k].qos ||
resubscribe) {
const currentOpts = {
topic: k,
qos: obj[k].qos
}
if (version === 5) {
currentOpts.nl = obj[k].nl
currentOpts.rap = obj[k].rap
currentOpts.rh = obj[k].rh
currentOpts.properties = opts.properties
}
debug('subscribe: pushing `%s` to subs list', currentOpts)
subs.push(currentOpts)
}
})
}
if (!subs.length) {
callback(null, [])
return this
}
const subscribeProc = function () {
const messageId = that._nextId()
if (messageId === null) {
debug('No messageId left')
return false
}
const packet = {
cmd: 'subscribe',
subscriptions: subs,
qos: 1,
retain: false,
dup: false,
messageId: messageId
}
if (opts.properties) {
packet.properties = opts.properties
}
// subscriptions to resubscribe to in case of disconnect
if (that.options.resubscribe) {
debug('subscribe :: resubscribe true')
const topics = []
subs.forEach(function (sub) {
if (that.options.reconnectPeriod > 0) {
const topic = { qos: sub.qos }
if (version === 5) {
topic.nl = sub.nl || false
topic.rap = sub.rap || false
topic.rh = sub.rh || 0
topic.properties = sub.properties
}
that._resubscribeTopics[sub.topic] = topic
topics.push(sub.topic)
}
})
that.messageIdToTopic[packet.messageId] = topics
}
that.outgoing[packet.messageId] = {
volatile: true,
cb: function (err, packet) {
if (!err) {
const granted = packet.granted
for (let i = 0; i < granted.length; i += 1) {
subs[i].qos = granted[i]
}
}
callback(err, subs)
}
}
debug('subscribe :: call _sendPacket')
that._sendPacket(packet)
return true
}
if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !subscribeProc()) {
this._storeProcessingQueue.push(
{
invoke: subscribeProc,
callback: callback
}
)
}
return this
}
/**
* unsubscribe - unsubscribe from topic(s)
*
* @param {String, Array} topic - topics to unsubscribe from
* @param {Object} [opts] - optional subscription options, includes:
* {Object} properties - properties of unsubscribe packet
* @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 () {
const that = this
const args = new Array(arguments.length)
for (let i = 0; i < arguments.length; i++) {
args[i] = arguments[i]
}
let topic = args.shift()
let callback = args.pop() || nop
let opts = args.pop()
if (typeof topic === 'string') {
topic = [topic]
}
if (typeof callback !== 'function') {
opts = callback
callback = nop
}
const invalidTopic = validations.validateTopics(topic)
if (invalidTopic !== null) {
setImmediate(callback, new Error('Invalid topic ' + invalidTopic))
return this
}
if (that._checkDisconnecting(callback)) {
return this
}
const unsubscribeProc = function () {
const messageId = that._nextId()
if (messageId === null) {
debug('No messageId left')
return false
}
const packet = {
cmd: 'unsubscribe',
qos: 1,
messageId: messageId
}
if (typeof topic === 'string') {
packet.unsubscriptions = [topic]
} else if (Array.isArray(topic)) {
packet.unsubscriptions = topic
}
if (that.options.resubscribe) {
packet.unsubscriptions.forEach(function (topic) {
delete that._resubscribeTopics[topic]
})
}
if (typeof opts === 'object' && opts.properties) {
packet.properties = opts.properties
}
that.outgoing[packet.messageId] = {
volatile: true,
cb: callback
}
debug('unsubscribe: call _sendPacket')
that._sendPacket(packet)
return true
}
if (this._storeProcessing || this._storeProcessingQueue.length > 0 || !unsubscribeProc()) {
this._storeProcessingQueue.push(
{
invoke: unsubscribeProc,
callback: callback
}
)
}
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 {Object} opts - added to the disconnect packet
* @param {Function} cb - called when the client has been closed
*
* @api public
*/
MqttClient.prototype.end = function (force, opts, cb) {
const that = this
debug('end :: (%s)', this.options.clientId)
if (force == null || typeof force !== 'boolean') {
cb = opts || nop
opts = force
force = false
if (typeof opts !== 'object') {
cb = opts
opts = null
if (typeof cb !== 'function') {
cb = nop
}
}
}
if (typeof opts !== 'object') {
cb = opts
opts = null
}
debug('end :: cb? %s', !!cb)
cb = cb || nop
function closeStores () {
debug('end :: closeStores: closing incoming and outgoing stores')
that.disconnected = true
that.incomingStore.close(function (e1) {
that.outgoingStore.close(function (e2) {
debug('end :: closeStores: emitting end')
that.emit('end')
if (cb) {
const err = e1 || e2
debug('end :: closeStores: invoking callback with args')
cb(err)
}
})
})
if (that._deferredReconnect) {
that._deferredReconnect()
}