Ejemplo n.º 1
0
func (self *Handler) Publish(p *codec.PublishMessage) {
	//log.Info("Received Publish Message: %s: %+v", p.PacketIdentifier, p)
	conn := self.Connection

	// TODO: check permission.

	// TODO: この部分はengine側にあるべき機能なので治す(というか下のconnectionがやる所?)
	if p.QosLevel == 1 {
		ack := codec.NewPubackMessage()
		ack.PacketIdentifier = p.PacketIdentifier
		conn.WriteMessageQueue(ack)
		log.Debug("Send puback message to sender. [%s: %d]", conn.GetId(), ack.PacketIdentifier)
	} else if p.QosLevel == 2 {
		ack := codec.NewPubrecMessage()
		ack.PacketIdentifier = p.PacketIdentifier
		conn.WriteMessageQueue(ack)
		log.Debug("Send pubrec message to sender. [%s: %d]", conn.GetId(), ack.PacketIdentifier)
	}

	// TODO: QoSによっては適切なMessageIDを追加する
	// Server / ClientはそれぞれMessageTableが違う
	if p.QosLevel > 0 {
		// TODO: と、いうことはメッセージの deep コピーが簡単にできるようにしないとだめ
		// 色々考えると面倒だけど、ひとまずはフルコピーでやっとこう
		//			id := conn.GetOutGoingTable().NewId()
		//			p.PacketIdentifier = id
		conn.GetOutGoingTable().Register(p.PacketIdentifier, p, conn)
		p.Opaque = conn
	}

	// NOTE: We don't block here. currently use goroutine but should pass message to background worker.
	go self.Engine.SendPublishMessage(p, conn.GetId(), conn.IsBridge())
}
Ejemplo n.º 2
0
func (self *Momonga) Subscribe(p *codec.SubscribeMessage, conn Connection) {
	log.Debug("Subscribe Message: [%s] %+v\n", conn.GetId(), p)

	ack := codec.NewSubackMessage()
	ack.PacketIdentifier = p.PacketIdentifier
	// TODO: 稀にconnがMonnectionの時がある
	cn := conn.(*MmuxConnection)

	var retained []*codec.PublishMessage
	// どのレベルでlockするか
	qosBuffer := bytes.NewBuffer(make([]byte, len(p.Payload)))
	for _, payload := range p.Payload {
		// don't subscribe multiple time
		if cn.IsSubscribed(payload.TopicPath) {
			log.Error("Map exists. [%s:%s]", conn.GetId(), payload.TopicPath)
			continue
		}

		set := &SubscribeSet{
			TopicFilter: payload.TopicPath,
			ClientId:    conn.GetId(),
			QoS:         int(payload.RequestedQos),
		}
		binary.Write(qosBuffer, binary.BigEndian, payload.RequestedQos)

		// Retain
		self.TopicMatcher.Add(payload.TopicPath, set)
		conn.AppendSubscribedTopic(payload.TopicPath, set)
		retaines := self.RetainMatch(payload.TopicPath)
		if len(retaines) > 0 {
			for i := range retaines {
				log.Debug("Retains: %s", retaines[i].TopicName)
				id := conn.GetOutGoingTable().NewId()

				pp, _ := codec.CopyPublishMessage(retaines[i])
				pp.PacketIdentifier = id
				conn.GetOutGoingTable().Register(id, pp, conn)
				retained = append(retained, pp)
			}
		}
		Metrics.System.Broker.SubscriptionsCount.Add(1)
	}
	ack.Qos = qosBuffer.Bytes()

	// MEMO: we can reply directly, no need to route, persite message.
	log.Debug("Send Suback Message To: %s", conn.GetId())
	conn.WriteMessageQueue(ack)
	if len(retained) > 0 {
		log.Debug("Send retained Message To: %s", conn.GetId())
		for i := range retained {
			conn.WriteMessageQueue(retained[i])
		}
	}

}
Ejemplo n.º 3
0
func (self *Momonga) setupCallback() {
	self.OutGoingTable.SetOnFinish(func(id uint16, message codec.Message, opaque interface{}) {
		switch message.GetType() {
		case codec.PACKET_TYPE_PUBLISH:
			p := message.(*codec.PublishMessage)
			if p.QosLevel == 2 {
				ack := codec.NewPubcompMessage()
				ack.PacketIdentifier = p.PacketIdentifier
				// TODO: WHAAAT? I don't remember this
				//				if conn != nil {
				//					conn.WriteMessageQueue(ack)
				//				}
			}
			break
		default:
			log.Debug("1Not supported; %d", message.GetType())
		}
	})

	// For now
	if self.EnableSys {
		msg := codec.NewPublishMessage()
		msg.TopicName = "$SYS/broker/broker/version"
		msg.Payload = []byte("0.1.0")
		msg.Retain = 1

		self.SendPublishMessage(msg, "", false)
	}
}
Ejemplo n.º 4
0
func (self *Handler) Pubcomp(messageId uint16) {
	//pubcompを受け取る、ということはserverがsender
	log.Debug("Received Pubcomp Message from %s", self.Connection.GetId())

	self.Engine.OutGoingTable.Unref(messageId)
	self.Connection.GetOutGoingTable().Unref(messageId)
}
Ejemplo n.º 5
0
func (self *MmuxConnection) Attach(conn Connection) {
	self.Mutex.Lock()
	defer self.Mutex.Unlock()

	var container Connection
	container = conn
	old := atomic.SwapPointer((*unsafe.Pointer)((unsafe.Pointer)(&self.Connection)), unsafe.Pointer(&container))
	if old != nil {
		// 1.If the ClientId represents a Client already connected to the Server
		// then the Server MUST disconnect the existing Client [MQTT-3.1.4-2].
		(*(*Connection)(old)).Close()
		log.Debug("close existing connection")
	}

	self.CleanSession = conn.ShouldCleanSession()
	if conn.ShouldCleanSession() {
		self.OfflineQueue = self.OfflineQueue[:0]
		self.SubscribeMap = make(map[string]bool)
		self.SubscribedTopics = make(map[string]*SubscribeSet)

		// Should I remove remaining QoS1, QoS2 message at this time?
		self.OutGoingTable.Clean()
	} else {
		if len(self.OfflineQueue) > 0 {
			log.Info("Process Offline Queue: Playback: %d", len(self.OfflineQueue))
			for i := 0; i < len(self.OfflineQueue); i++ {
				self.writeMessageQueue(self.OfflineQueue[i])
			}
			self.OfflineQueue = self.OfflineQueue[:0]
		}
	}
}
Ejemplo n.º 6
0
func (self *Handler) Disconnect() {
	log.Debug("Received disconnect from %s", self.Connection.GetId())
	if cn, ok := self.Connection.(*MyConnection); ok {
		cn.Disconnect()
	}

	Metrics.System.Broker.Clients.Connected.Add(-1)
	//return &DisconnectError{}
}
Ejemplo n.º 7
0
func (self *Momonga) Unsubscribe(messageId uint16, granted int, payloads []codec.SubscribePayload, conn Connection) {
	log.Debug("Unsubscribe :")
	ack := codec.NewUnsubackMessage()
	ack.PacketIdentifier = messageId

	topics := conn.GetSubscribedTopics()
	for _, payload := range payloads {
		if v, ok := topics[payload.TopicPath]; ok {
			self.TopicMatcher.Remove(payload.TopicPath, v)
		}
	}
	conn.WriteMessageQueue(ack)
}
Ejemplo n.º 8
0
func (self *Handler) HandshakeInternal(p *codec.ConnectMessage) {
	var conn *MyConnection
	var ok bool

	if conn, ok = self.Connection.(*MyConnection); !ok {
		log.Debug("wrong sequence.")
		self.Connection.Close()
		return
	}

	mux := self.Engine.Handshake(p, conn)
	if mux != nil {
		self.Connection = mux
	}
}
Ejemplo n.º 9
0
func (self *Handler) Puback(messageId uint16) {
	log.Debug("Received Puback Message from [%s: %d]", self.Connection.GetId(), messageId)

	if tbl, ok := self.Engine.InflightTable[self.Connection.GetId()]; ok {
		p, _ := tbl.Get(messageId)
		if msg, ok := p.(*codec.PublishMessage); ok {
			// TODO: やっぱclose済みのチャンネルにおくっちゃうよねー
			msg.Opaque.(chan string) <- self.Connection.GetId()
		}
		if t, ok := self.Engine.InflightTable[self.Connection.GetId()]; ok {
			t.Unref(messageId)
		}
	}

	// TODO: これのIDは内部的なの?
	self.Engine.OutGoingTable.Unref(messageId)
	self.Connection.GetOutGoingTable().Unref(messageId)
}
Ejemplo n.º 10
0
func (self *TlsServer) Serve(l net.Listener) error {
	defer func() {
		l.Close()
	}()

	var tempDelay time.Duration // how long to sleep on accept failure

Accept:
	for {
		select {
		case <-self.stop:
			break Accept
		default:
			client, err := l.Accept()
			if err != nil {
				if v, ok := client.(*net.TCPConn); ok {
					v.SetNoDelay(true)
					v.SetKeepAlive(true)
				}

				if ne, ok := err.(net.Error); ok && ne.Temporary() {
					if tempDelay == 0 {
						tempDelay = 5 * time.Millisecond
					} else {
						tempDelay *= 2
					}

					if max := 1 * time.Second; tempDelay > max {
						tempDelay = max
					}

					log.Info("momonga: Accept error: %v; retrying in %v", err, tempDelay)
					time.Sleep(tempDelay)
					continue
				}

				if strings.Contains(err.Error(), "use of closed network connection") {
					log.Error("Accept Failed: %s", err)
					continue
				}

				log.Error("Accept Error: %s", err)
				return err
			}
			tempDelay = 0

			myconf := GetDefaultMyConfig()
			myconf.MaxMessageSize = self.Engine.Config().Server.MessageSizeLimit
			conn := NewMyConnection(myconf)
			conn.SetMyConnection(client)
			conn.SetId(client.RemoteAddr().String())

			log.Debug("Accepted: %s", conn.GetId())
			go self.Engine.HandleConnection(conn)
		}
	}

	self.listener.(*MyListener).wg.Wait()
	self.once.Do(func() {
		self.wg.Done()
	})
	return nil
}
Ejemplo n.º 11
0
func (self *Momonga) HandleConnection(conn Connection) {
	defer func() {
		if err := recover(); err != nil {
			const size = 64 << 10
			buf := make([]byte, size)
			buf = buf[:runtime.Stack(buf, false)]
			log.Error("momonga: panic serving %s: %v\n%s", conn.GetId(), err, buf)
		}
	}()

	hndr := NewHandler(conn, self)

	for {
		// TODO: change api name, actually this processes message
		_, err := conn.ReadMessage()
		if err != nil {
			log.Debug("Read Message Error: %s", err)
		}
		if conn.GetState() == STATE_CLOSED {
			err = &DisconnectError{}
		}
		Metrics.System.Broker.Messages.Received.Add(1)

		if err != nil {
			Metrics.System.Broker.Clients.Connected.Add(-1)
			log.Debug("DISCONNECT: %s", conn.GetId())
			// ここでmyconnがかえる場合はhandshake前に死んでる
			//self.Engine.CleanSubscription(conn)
			mux, e := self.GetConnectionByClientId(conn.GetId())
			if e != nil {
				log.Error("(while processing disconnect) can't fetch connection: %s, %T", conn.GetId(), conn)
			}

			if _, ok := err.(*DisconnectError); !ok {
				if conn.HasWillMessage() {
					self.SendWillMessage(conn)
				}

				if err == io.EOF {
					// nothing to do
				} else {
					log.Error("Handle Connection Error: %s", err)
				}
			}

			if mux != nil {
				var dummy *DummyPlug

				if mux.ShouldCleanSession() {
					self.CleanSubscription(mux)
					self.RemoveConnectionByClientId(mux.GetId())
				} else {
					dummy = NewDummyPlug(self)
					dummy.SetId(conn.GetId())
				}

				mux.Detach(conn, dummy)
			}

			if v, ok := conn.(*MyConnection); ok {
				v.Terminate()
			}
			conn.Close()
			hndr.Close()
			return
		}
	}
}
Ejemplo n.º 12
0
func (self *Momonga) Handshake(p *codec.ConnectMessage, conn *MyConnection) *MmuxConnection {
	log.Debug("handshaking: %s", p.Identifier)

	if conn.Connected == true {
		log.Error("wrong sequence. (connect twice)")
		conn.Close()
		return nil
	}

	if ok := self.checkVersion(p); ok != nil {
		log.Error("magic is not expected: %s  %+v\n", string(p.Magic), p)
		conn.Close()
		return nil
	}

	// TODO: implement authenticator
	if ok, _ := self.Authenticate(p.UserName, p.Password); !ok {
		log.Error("authenticate failed:")
		conn.Close()
		return nil
	}

	// preserve messagen when will flag set
	if (p.Flag & 0x4) > 0 {
		conn.SetWillMessage(*p.Will)
	}

	if (p.Version & 0x80) > 0 {
		conn.Bridged = true
	}

	if !p.CleanSession {
		conn.DisableCleanSession()
	}

	var mux *MmuxConnection
	var err error

	reply := codec.NewConnackMessage()
	if mux, err = self.GetConnectionByClientId(p.Identifier); err == nil {
		// [MQTT-3.2.2-2] If the Server accepts a connection with CleanSession set to 0,
		// the value set in Session Present depends on whether the Server already has stored Session state
		// for the supplied client ID. If the Server has stored Session state,
		// it MUST set Session Present to 1 in the CONNACK packet.
		reply.Reserved |= 0x01
	}

	// CONNACK MUST BE FIRST RESPONSE
	// clean周りはAttachでぜんぶやるべきでは
	conn.WriteMessageQueue(reply)
	if mux != nil {
		log.Info("Attach to mux[%s]", mux.GetId())

		conn.SetId(p.Identifier)
		conn.SetKeepaliveInterval(int(p.KeepAlive))
		mux.SetKeepaliveInterval(int(p.KeepAlive))
		mux.SetState(STATE_CONNECTED)
		mux.DisableCleanSession()

		if conn.ShouldCleanSession() {
			self.CleanSubscription(mux)
		}
		mux.Attach(conn)
	} else {
		mux = NewMmuxConnection()
		mux.SetId(p.Identifier)

		mux.Attach(conn)
		self.SetConnectionByClientId(mux.GetId(), mux)

		conn.SetId(p.Identifier)
		conn.SetKeepaliveInterval(int(p.KeepAlive))
		mux.SetKeepaliveInterval(int(p.KeepAlive))
		mux.SetState(STATE_CONNECTED)

		log.Debug("Starting new mux[%s]", mux.GetId())
	}

	if p.CleanSession {
		// これは正直どうでもいい
		delete(self.RetryMap, mux.GetId())
	} else {
		// Okay, attach to existing session.
		tbl := mux.GetOutGoingTable()

		// これは途中の再送処理
		for _, c := range tbl.Hash {
			msgs := make([]codec.Message, 0)
			//check qos1, 2 message and resend to this client.
			if v, ok := c.Message.(*codec.PublishMessage); ok {
				if v.QosLevel > 0 {
					//mux.WriteMessageQueue(c.Message)
					msgs = append(msgs, c.Message)
				}
			}
			tbl.Clean()

			// TODO: improve this
			for _, v := range msgs {
				mux.WriteMessageQueue(v)
			}
		}
	}

	conn.Connected = true
	log.Debug("handshake Successful: %s", p.Identifier)
	Metrics.System.Broker.Clients.Connected.Add(1)
	return mux
}
Ejemplo n.º 13
0
func (self *Momonga) SendPublishMessage(msg *codec.PublishMessage, client_id string, is_bridged bool) {
	// Don't pass wrong message here. user should validate the message be ore using this API.
	if len(msg.TopicName) < 1 {
		return
	}

	// TODO: Have to persist retain message.
	if msg.Retain > 0 {
		if len(msg.Payload) == 0 {
			log.Debug("[DELETE RETAIN: %s]\n%s", msg.TopicName, hex.Dump([]byte(msg.TopicName)))

			err := self.DataStore.Del([]byte(msg.TopicName), []byte(msg.TopicName))
			if err != nil {
				log.Error("Error: %s\n", err)
			}
			// これ配送したらおかしいべ
			log.Debug("Deleted retain: %s", msg.TopicName)
			// あれ、ackとかかえすんだっけ?
			Metrics.System.Broker.Messages.RetainedCount.Add(-1)
			return
		} else {
			buffer := bytes.NewBuffer(nil)
			codec.WriteMessageTo(msg, buffer)
			self.DataStore.Put([]byte(msg.TopicName), buffer.Bytes())
			Metrics.System.Broker.Messages.RetainedCount.Add(1)
		}
	}

	if Mflags["experimental.qos1"] {
		if msg.QosLevel == 1 {
			targets := self.TopicMatcher.Match(msg.TopicName)

			go func(msg *codec.PublishMessage, set []interface{}) {
				p := make(chan string, 1000)
				wg := sync.WaitGroup{}
				wg.Add(3) // bulk sernder, retry kun, receive kun

				mchan := make(chan string, 256)
				term := make(chan bool, 1)
				cnt := len(set)
				mng := make(map[string]*codec.PublishMessage)

				// retry kun。こういう実装だととても楽
				go func(term chan bool, mchan chan string, mng map[string]*codec.PublishMessage) {
					for {
						select {
						case m := <-mchan:
							if msg, ok := mng[m]; ok {
								conn, err := self.GetConnectionByClientId(m)
								if err != nil {
									fmt.Printf("something wrong: %s %s", m, err)
									continue
								}

								if err == nil {
									log.Debug("sending a retry msg: %s", msg)
									conn.WriteMessageQueue(msg)
								} else {
									log.Debug("connection not exist. next retry")
								}
							}
						case <-term:
							log.Debug("  retry finished.")

							wg.Done()
							return
						}
					}
				}(term, mchan, mng)

				// reader
				go func(p chan string, term chan bool, cnt int, mng map[string]*codec.PublishMessage, mchan chan string) {
					limit := time.After(time.Second * 60)
					for {
						select {
						case id := <-p:
							cnt--
							delete(mng, id)
							// これはcallbackでやってもいいようなきもするけど、wait groupとかもろもろ渡すの面倒くさい

							if cnt < 1 {
								log.Debug("  all delivery finished.")
								term <- true

								wg.Done()
								return
							}
						case <-time.After(time.Second * 20):
							// 終わってないやつをなめてリトライさせる
							for cid, m := range mng {
								m.Dupe = true
								mchan <- cid
							}
						case <-limit:
							log.Debug("  gave up retry.")
							term <- true
							wg.Done()
							return
						}
					}
				}(p, term, cnt, mng, mchan)

				// sender. これは勝手に終わる
				go func(msg *codec.PublishMessage, set []interface{}, p chan string, mng map[string]*codec.PublishMessage) {
					dp := make(map[string]bool)
					for i := range targets {
						var tbl *util.MessageTable
						var ok bool

						myset := targets[i].(*SubscribeSet)
						fmt.Printf("myset: %s", myset)

						// NOTE (from interoperability/client_test.py):
						//
						//   overlapping subscriptions. When there is more than one matching subscription for the same client for a topic,
						//   the server may send back one message with the highest QoS of any matching subscription, or one message for
						//   each subscription with a matching QoS.
						//
						// Currently, We choose one message for each subscription with a matching QoS.
						//
						if _, ok := dp[myset.ClientId]; ok {
							continue
						}
						dp[myset.ClientId] = true

						x, _ := codec.CopyPublishMessage(msg)
						x.QosLevel = myset.QoS
						conn, err := self.GetConnectionByClientId(myset.ClientId)
						// これは面倒臭い。clean sessionがtrueで再接続した時はもはや別人として扱わなければならない

						if x.QosLevel == 0 {
							// QoS 0にダウングレードしたらそのまま終わらせる
							conn.WriteMessageQueue(x)
							p <- myset.ClientId
							continue
						}

						if tbl, ok = self.InflightTable[myset.ClientId]; !ok {
							self.InflightTable[myset.ClientId] = util.NewMessageTable()
							// callback仕込めるんだよなー。QoS1なら使わなくてもいいかなー。とかおもったり

							tbl = self.InflightTable[myset.ClientId]
						}

						id := tbl.NewId()
						x.PacketIdentifier = id
						x.Opaque = p
						tbl.Register2(id, x, 1, x)

						if err != nil {
							continue
						}
						mng[myset.ClientId] = x
						conn.WriteMessageQueue(x)
					}
					log.Debug("  all fisrt delivery finished.")

					wg.Done()
				}(msg, targets, p, mng)

				wg.Wait()
				close(p)
				close(mchan)
				close(term)
				mng = nil
				log.Debug("  okay, cleanup qos1 sending thread.")
			}(msg, targets)
			return
		}
	}

	// Publishで受け取ったMessageIdのやつのCountをとっておく
	// で、Pubackが帰ってきたらrefcountを下げて0になったらMessageを消す
	//log.Debug("TopicName: %s %s", m.TopicName, m.Payload)
	targets := self.TopicMatcher.Match(msg.TopicName)
	if msg.TopicName[0:1] == "#" {
		// TODO:  [MQTT-4.7.2-1] The Server MUST NOT match Topic Filters starting with a wildcard character
		// (# or +) with Topic Names beginning with a $ character
	}

	// list つくってからとって、だとタイミング的に居ない奴も出てくるんだよな。マジカオス
	// ここで必要なのは, connection(clientId), subscribed qosがわかればあとは投げるだけ
	// なんで、Qlobberがかえすのはであるべきなんだけど。これすっげー消しづらいのよね・・・
	// {
	//    Connection: Connection or client id
	//    QoS:
	// }
	// いやまぁエラーハンドリングちゃんとやってれば問題ない。
	// client idのほうがベターだな。Connectionを無駄に参照つけると後が辛い
	dp := make(map[string]bool)
	count := 0

	for i := range targets {
		var cn Connection
		var ok error

		myset := targets[i].(*SubscribeSet)
		clientId := myset.ClientId
		//clientId := targets[i].(string)

		// NOTE (from interoperability/client_test.py):
		//
		//   overlapping subscriptions. When there is more than one matching subscription for the same client for a topic,
		//   the server may send back one message with the highest QoS of any matching subscription, or one message for
		//   each subscription with a matching QoS.
		//
		// Currently, We choose one message for each subscription with a matching QoS.
		//
		if _, ok := dp[clientId]; ok {
			continue
		}
		dp[clientId] = true

		cn, ok = self.GetConnectionByClientId(clientId)
		if ok != nil {
			// どちらかというとClientが悪いと思うよ!
			// リスト拾った瞬間にはいたけど、その後いなくなったんだから配送リストからこれらは無視すべき
			log.Info("(can't fetch %s. already disconnected, or unsubscribed?)", clientId)
			continue
		}

		if cn.IsBridge() && clientId == client_id {
			// Don't send message to same bridge
			continue
		}

		var x *codec.PublishMessage

		if msg.QosLevel == 0 {
			// we don't need to copy message on QoS 0
			x = msg
		} else {
			x = codec.MustCopyPublishMessage(msg)
		}

		subscriberQos := myset.QoS
		// Downgrade QoS
		if subscriberQos < x.QosLevel {
			x.QosLevel = subscriberQos
		}

		if x.QosLevel > 0 {
			// TODO: ClientごとにInflightTableを持つ
			// engineのOutGoingTableなのはとりあえず、ということ
			id := self.OutGoingTable.NewId()
			x.PacketIdentifier = id
			if sender, ok := x.Opaque.(Connection); ok {
				// TODO: ここ(でなにをするつもりだったのか・・w)
				self.OutGoingTable.Register2(x.PacketIdentifier, x, len(targets), sender)
			}
		}

		cn.WriteMessageQueue(x)
		count++
	}

	Metrics.System.Broker.Messages.Sent.Add(int64(count))
}
Ejemplo n.º 14
0
func (self *Handler) Pubrel(messageId uint16) {
	ack := codec.NewPubcompMessage()
	ack.PacketIdentifier = messageId
	self.Connection.WriteMessageQueue(ack)
	log.Debug("Send pubcomp message to sender. [%s: %d]", self.Connection.GetId(), messageId)
}
Ejemplo n.º 15
0
func (self *Handler) Unsubscribe(messageId uint16, granted int, payloads []codec.SubscribePayload) {
	log.Debug("Received unsubscribe from [%s]: %s\n", self.Connection.GetId(), messageId)
	self.Engine.Unsubscribe(messageId, granted, payloads, self.Connection)
}
Ejemplo n.º 16
0
func (self *DummyPlug) Run() {
	for {
		select {
		case <-self.stop:
			return
		case b := <-self.Switch:
			self.Running = b
		case m := <-self.message:
			if self.Running {
				// メッセージが来たらengineのAPIをたたけばOK
				switch m.GetType() {
				case mqtt.PACKET_TYPE_CONNECT:
				case mqtt.PACKET_TYPE_CONNACK:
				case mqtt.PACKET_TYPE_PUBLISH:
					// TODO:
					if p, ok := m.(*mqtt.PublishMessage); ok {
						fmt.Printf("%s\n", p)
						switch p.QosLevel {
						case 1:
							log.Debug("[DUMMY] Received Publish Message from [%d]. reply puback", p.PacketIdentifier)
							self.engine.OutGoingTable.Unref(p.PacketIdentifier)
						case 2:
							log.Debug("[DUMMY] Received Publish Message from [%d]. reply pubrec", p.PacketIdentifier)
							self.engine.OutGoingTable.Unref(p.PacketIdentifier)
							rel := mqtt.NewPubrelMessage()
							rel.PacketIdentifier = p.PacketIdentifier
							// NOTE: client have to reply pubrec to the server
							self.message <- rel
						}
					}
				case mqtt.PACKET_TYPE_DISCONNECT:
					// TODO: なの?
				case mqtt.PACKET_TYPE_SUBSCRIBE:
				case mqtt.PACKET_TYPE_SUBACK:
				case mqtt.PACKET_TYPE_UNSUBSCRIBE:
				case mqtt.PACKET_TYPE_UNSUBACK:
				case mqtt.PACKET_TYPE_PINGRESP:
				case mqtt.PACKET_TYPE_PINGREQ:
				case mqtt.PACKET_TYPE_PUBACK:
					// TODO: (nothign to do)
				case mqtt.PACKET_TYPE_PUBREC:
					// TODO: (nothign to do)
				case mqtt.PACKET_TYPE_PUBREL:
					// TODO:
					if p, ok := m.(*mqtt.PubrelMessage); ok {
						log.Debug("[DUMMY] Received Pubrel Message from [%d]. send pubcomp", p.PacketIdentifier)
						self.engine.OutGoingTable.Unref(p.PacketIdentifier)

						cmp := mqtt.NewPubcompMessage()
						cmp.PacketIdentifier = p.PacketIdentifier
						// NOTE: client have to reply pubcomp to the server
						self.message <- cmp
					}
				case mqtt.PACKET_TYPE_PUBCOMP:
					// TODO: (nothing)
				default:
					return
				}
			} else {
				// discards message
			}
		}
	}
}