Golang glog.Errorf函数代码示例

// Publish sends a single MQTT PUBLISH message to the server. On completion, the
// supplied OnCompleteFunc is called. For QOS 0 messages, onComplete is called
// immediately after the message is sent to the outgoing buffer. For QOS 1 messages,
// onComplete is called when PUBACK is received. For QOS 2 messages, onComplete is
// called after the PUBCOMP message is received.
func (this *Server) Publish(msg *message.PublishMessage, onComplete OnCompleteFunc) error {
	if err := this.checkConfiguration(); err != nil {
		return err
	}

	if msg.Retain() {
		if err := this.topicsMgr.Retain(msg); err != nil {
			glog.Errorf("Error retaining message: %v", err)
		}
	}

	if err := this.topicsMgr.Subscribers(msg.Topic(), msg.QoS(), &this.subs, &this.qoss); err != nil {
		return err
	}

	msg.SetRetain(false)

	//glog.Debugf("(server) Publishing to topic %q and %d subscribers", string(msg.Topic()), len(this.subs))
	for _, s := range this.subs {
		if s != nil {
			fn, ok := s.(*OnPublishFunc)
			if !ok {
				glog.Errorf("Invalid onPublish Function")
			} else {
				(*fn)(msg)
			}
		}
	}

	return nil
}

// onPublish() is called when the server receives a PUBLISH message AND have completed
// the ack cycle. This method will get the list of subscribers based on the publish
// topic, and publishes the message to the list of subscribers.
func (this *service) onPublish(msg *message.PublishMessage) error {
	if msg.Retain() {
		if err := this.topicsMgr.Retain(msg); err != nil {
			glog.Errorf("(%s) Error retaining message: %v", this.cid(), err)
		}
	}

	err := this.topicsMgr.Subscribers(msg.Topic(), msg.QoS(), &this.subs, &this.qoss)
	if err != nil {
		glog.Errorf("(%s) Error retrieving subscribers list: %v", this.cid(), err)
		return err
	}

	msg.SetRetain(false)

	//glog.Debugf("(%s) Publishing to topic %q and %d subscribers", this.cid(), string(msg.Topic()), len(this.subs))
	for _, s := range this.subs {
		if s != nil {
			fn, ok := s.(*OnPublishFunc)
			if !ok {
				glog.Errorf("Invalid onPublish Function")
				return fmt.Errorf("Invalid onPublish Function")
			} else {
				(*fn)(msg)
			}
		}
	}

	return nil
}

func main() {
	svr := &service.Server{
		KeepAlive:        keepAlive,
		ConnectTimeout:   connectTimeout,
		AckTimeout:       ackTimeout,
		TimeoutRetries:   timeoutRetries,
		SessionsProvider: sessionsProvider,
		TopicsProvider:   topicsProvider,
	}

	var f *os.File
	var err error

	if cpuprofile != "" {
		f, err = os.Create(cpuprofile)
		if err != nil {
			log.Fatal(err)
		}

		pprof.StartCPUProfile(f)
	}

	sigchan := make(chan os.Signal, 1)
	signal.Notify(sigchan, os.Interrupt, os.Kill)
	go func() {
		sig := <-sigchan
		glog.Errorf("Existing due to trapped signal; %v", sig)

		if f != nil {
			glog.Errorf("Stopping profile")
			pprof.StopCPUProfile()
			f.Close()
		}

		svr.Close()

		os.Exit(0)
	}()

	mqttaddr := "tcp://:1883"

	if len(wsAddr) > 0 || len(wssAddr) > 0 {
		addr := "tcp://127.0.0.1:1883"
		AddWebsocketHandler("/mqtt", addr)
		/* start a plain websocket listener */
		if len(wsAddr) > 0 {
			go ListenAndServeWebsocket(wsAddr)
		}
		/* start a secure websocket listener */
		if len(wssAddr) > 0 && len(wssCertPath) > 0 && len(wssKeyPath) > 0 {
			go ListenAndServeWebsocketSecure(wssAddr, wssCertPath, wssKeyPath)
		}
	}

	/* create plain MQTT listener */
	err = svr.ListenAndServe(mqttaddr)
	if err != nil {
		glog.Errorf("surgemq/main: %v", err)
	}
}

func profile() {
	var f *os.File
	var err error

	if cpuprofile != "" {
		f, err = os.Create(cpuprofile)
		if err != nil {
			log.Fatal(err)
		}

		pprof.StartCPUProfile(f)
	}

	sigchan := make(chan os.Signal, 1)
	signal.Notify(sigchan, os.Interrupt, os.Kill)
	go func() {
		select {
		case sig := <-sigchan:
			log.Printf("Existing due to trapped signal; %v", sig)

		case <-quit:
			log.Println("Quiting...")

		}

		if f != nil {
			glog.Errorf("Stopping profile")
			pprof.StopCPUProfile()
			f.Close()
		}

		close(done)
		os.Exit(0)
	}()
}

func (this *service) start() error {
	var err error

	// Create the incoming ring buffer
	this.in, err = newBuffer(defaultBufferSize)
	if err != nil {
		return err
	}

	// Create the outgoing ring buffer
	this.out, err = newBuffer(defaultBufferSize)
	if err != nil {
		return err
	}

	// If this is a server
	if !this.client {
		// Creat the onPublishFunc so it can be used for published messages
		this.onpub = func(msg *message.PublishMessage) error {
			if err := this.publish(msg, nil); err != nil {
				glog.Errorf("service/onPublish: Error publishing message: %v", err)
				return err
			}

			return nil
		}

		// If this is a recovered session, then add any topics it subscribed before
		topics, qoss, err := this.sess.Topics()
		if err != nil {
			return err
		} else {
			for i, t := range topics {
				this.topicsMgr.Subscribe([]byte(t), qoss[i], &this.onpub)
			}
		}
	}

	// Processor is responsible for reading messages out of the buffer and processing
	// them accordingly.
	this.wgStarted.Add(1)
	this.wgStopped.Add(1)
	go this.processor()

	// Receiver is responsible for reading from the connection and putting data into
	// a buffer.
	this.wgStarted.Add(1)
	this.wgStopped.Add(1)
	go this.receiver()

	// Sender is responsible for writing data in the buffer into the connection.
	this.wgStarted.Add(1)
	this.wgStopped.Add(1)
	go this.sender()

	// Wait for all the goroutines to start before returning
	this.wgStarted.Wait()

	return nil
}

func main() {
	svr := &service.Server{
		KeepAlive:        keepAlive,
		ConnectTimeout:   connectTimeout,
		AckTimeout:       ackTimeout,
		TimeoutRetries:   timeoutRetries,
		SessionsProvider: sessionsProvider,
		TopicsProvider:   topicsProvider,
	}

	var f *os.File
	var err error

	if cpuprofile != "" {
		f, err = os.Create(cpuprofile)
		if err != nil {
			log.Fatal(err)
		}

		pprof.StartCPUProfile(f)
	}

	sigchan := make(chan os.Signal, 1)
	signal.Notify(sigchan, os.Interrupt, os.Kill)
	go func() {
		sig := <-sigchan
		glog.Errorf("Existing due to trapped signal; %v", sig)

		if f != nil {
			glog.Errorf("Stopping profile")
			pprof.StopCPUProfile()
			f.Close()
		}

		svr.Close()

		os.Exit(0)
	}()

	err = svr.ListenAndServe("tcp://:1883")
	if err != nil {
		glog.Errorf("surgemq/main: %v", err)
	}

}

// ListenAndServe listents to connections on the URI requested, and handles any
// incoming MQTT client sessions. It should not return until Close() is called
// or if there's some critical error that stops the server from running. The URI
// supplied should be of the form "protocol://host:port" that can be parsed by
// url.Parse(). For example, an URI could be "tcp://0.0.0.0:1883".
func (this *Server) ListenAndServe(uri string) error {
	defer atomic.CompareAndSwapInt32(&this.running, 1, 0)

	if !atomic.CompareAndSwapInt32(&this.running, 0, 1) {
		return fmt.Errorf("server/ListenAndServe: Server is already running")
	}

	this.quit = make(chan struct{})

	u, err := url.Parse(uri)
	if err != nil {
		return err
	}

	this.ln, err = net.Listen(u.Scheme, u.Host)
	if err != nil {
		return err
	}
	defer this.ln.Close()

	glog.Infof("server/ListenAndServe: server is ready...")

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

	for {
		conn, err := this.ln.Accept()

		if err != nil {
			// http://zhen.org/blog/graceful-shutdown-of-go-net-dot-listeners/
			select {
			case <-this.quit:
				return nil

			default:
			}

			// Borrowed from go1.3.3/src/pkg/net/http/server.go:1699
			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
				}
				glog.Errorf("server/ListenAndServe: Accept error: %v; retrying in %v", err, tempDelay)
				time.Sleep(tempDelay)
				continue
			}
			return err
		}

		go this.handleConnection(conn)
	}
}

// receiver() reads data from the network, and writes the data into the incoming buffer
func (this *service) receiver() {
	defer func() {
		// Let's recover from panic
		if r := recover(); r != nil {
			glog.Errorf("(%s) Recovering from panic: %v", this.cid(), r)
		}

		this.wgStopped.Done()

		glog.Debugf("(%s) Stopping receiver", this.cid())
	}()

	glog.Debugf("(%s) Starting receiver", this.cid())

	this.wgStarted.Done()

	switch conn := this.conn.(type) {
	case net.Conn:
		//glog.Debugf("server/handleConnection: Setting read deadline to %d", time.Second*time.Duration(this.keepAlive))
		keepAlive := time.Second * time.Duration(this.keepAlive)
		r := timeoutReader{
			d:    keepAlive + (keepAlive / 2),
			conn: conn,
		}

		for {
			_, err := this.in.ReadFrom(r)

			if err != nil {
				if err != io.EOF {
					glog.Errorf("(%s) error reading from connection: %v", this.cid(), err)
				}
				return
			}
		}

	//case *websocket.Conn:
	//	glog.Errorf("(%s) Websocket: %v", this.cid(), ErrInvalidConnectionType)

	default:
		glog.Errorf("(%s) %v", this.cid(), ErrInvalidConnectionType)
	}
}

func AddWebsocketHandler(urlPattern string, uri string) error {
	glog.Debugf("AddWebsocketHandler urlPattern=%s, uri=%s", urlPattern, uri)
	u, err := url.Parse(uri)
	if err != nil {
		glog.Errorf("surgemq/main: %v", err)
		return err
	}

	h := func(ws *websocket.Conn) {
		WebsocketTcpProxy(ws, u.Scheme, u.Host)
	}
	http.Handle(urlPattern, websocket.Handler(h))
	return nil
}

func startFanPublisher(t testing.TB, cid int, wg *sync.WaitGroup) {
	now := time.Now()

	runClientTest(t, cid, wg, func(svc *service.Client) {
		select {
		case <-done:
		case <-time.After(time.Second * time.Duration(subscribers)):
			glog.Infof("(surgemq%d) Timed out waiting for subscribe response", cid)
			return
		}

		cnt := messages
		sent := 0

		payload := make([]byte, size)
		msg := message.NewPublishMessage()
		msg.SetTopic(topic)
		msg.SetQoS(qos)

		for i := 0; i < cnt; i++ {
			binary.BigEndian.PutUint32(payload, uint32(cid*cnt+i))
			msg.SetPayload(payload)

			err := svc.Publish(msg, nil)
			if err != nil {
				break
			}
			sent++
		}

		since := time.Since(now).Nanoseconds()

		statMu.Lock()
		totalSent += int64(sent)
		totalSentTime += int64(since)
		if since > sentSince {
			sentSince = since
		}
		statMu.Unlock()

		glog.Debugf("(surgemq%d) Sent %d messages in %d ns, %d ns/msg, %d msgs/sec", cid, sent, since, int(float64(since)/float64(cnt)), int(float64(sent)/(float64(since)/float64(time.Second))))

		select {
		case <-done2:
		case <-time.Tick(time.Second * time.Duration(nap*publishers)):
			glog.Errorf("Timed out waiting for messages to be received.")
		}
	})
}

// sender() writes data from the outgoing buffer to the network
func (this *service) sender() {
	defer func() {
		// Let's recover from panic
		if r := recover(); r != nil {
			glog.Errorf("(%s) Recovering from panic: %v", this.cid(), r)
		}

		this.wgStopped.Done()

		glog.Debugf("(%s) Stopping sender", this.cid())
	}()

	glog.Debugf("(%s) Starting sender", this.cid())

	this.wgStarted.Done()

	switch conn := this.conn.(type) {
	case net.Conn:
		for {
			_, err := this.out.WriteTo(conn)

			if err != nil {
				if err != io.EOF {
					glog.Errorf("(%s) error writing data: %v", this.cid(), err)
				}
				return
			}
		}

	//case *websocket.Conn:
	//	glog.Errorf("(%s) Websocket not supported", this.cid())

	default:
		glog.Errorf("(%s) Invalid connection type", this.cid())
	}
}

// For SUBSCRIBE message, we should add subscriber, then send back SUBACK
func (this *service) processSubscribe(msg *message.SubscribeMessage) error {
	resp := message.NewSubackMessage()
	resp.SetPacketId(msg.PacketId())

	// Subscribe to the different topics
	var retcodes []byte

	topics := msg.Topics()
	qos := msg.Qos()

	this.rmsgs = this.rmsgs[0:0]

	for i, t := range topics {
		rqos, err := this.topicsMgr.Subscribe(t, qos[i], &this.onpub)
		if err != nil {
			return err
		}
		this.sess.AddTopic(string(t), qos[i])

		retcodes = append(retcodes, rqos)

		// yeah I am not checking errors here. If there's an error we don't want the
		// subscription to stop, just let it go.
		this.topicsMgr.Retained(t, &this.rmsgs)
		glog.Debugf("(%s) topic = %s, retained count = %d", this.cid(), string(t), len(this.rmsgs))
	}

	if err := resp.AddReturnCodes(retcodes); err != nil {
		return err
	}

	if _, err := this.writeMessage(resp); err != nil {
		return err
	}

	for _, rm := range this.rmsgs {
		if err := this.publish(rm, nil); err != nil {
			glog.Errorf("service/processSubscribe: Error publishing retained message: %v", err)
			return err
		}
	}

	return nil
}

// FIXME: The order of closing here causes panic sometimes. For example, if receiver
// calls this, and closes the buffers, somehow it causes buffer.go:476 to panid.
func (this *service) stop() {
	defer func() {
		// Let's recover from panic
		if r := recover(); r != nil {
			glog.Errorf("(%s) Recovering from panic: %v", this.cid(), r)
		}
	}()

	doit := atomic.CompareAndSwapInt64(&this.closed, 0, 1)
	if !doit {
		return
	}

	// Close quit channel, effectively telling all the goroutines it's time to quit
	if this.done != nil {
		glog.Debugf("(%s) closing this.done", this.cid())
		close(this.done)
	}

	// Close the network connection
	if this.conn != nil {
		glog.Debugf("(%s) closing this.conn", this.cid())
		this.conn.Close()
	}

	this.in.Close()
	this.out.Close()

	// Wait for all the goroutines to stop.
	this.wgStopped.Wait()

	glog.Debugf("(%s) Received %d bytes in %d messages.", this.cid(), this.inStat.bytes, this.inStat.msgs)
	glog.Debugf("(%s) Sent %d bytes in %d messages.", this.cid(), this.outStat.bytes, this.outStat.msgs)

	// Unsubscribe from all the topics for this client, only for the server side though
	if !this.client && this.sess != nil {
		topics, _, err := this.sess.Topics()
		if err != nil {
			glog.Errorf("(%s/%d): %v", this.cid(), this.id, err)
		} else {
			for _, t := range topics {
				if err := this.topicsMgr.Unsubscribe([]byte(t), &this.onpub); err != nil {
					glog.Errorf("(%s): Error unsubscribing topic %q: %v", this.cid(), t, err)
				}
			}
		}
	}

	// Publish will message if WillFlag is set. Server side only.
	if !this.client && this.sess.Cmsg.WillFlag() {
		glog.Infof("(%s) service/stop: connection unexpectedly closed. Sending Will.", this.cid())
		this.onPublish(this.sess.Will)
	}

	// Remove the client topics manager
	if this.client {
		topics.Unregister(this.sess.ID())
	}

	// Remove the session from session store if it's suppose to be clean session
	if this.sess.Cmsg.CleanSession() && this.sessMgr != nil {
		this.sessMgr.Del(this.sess.ID())
	}

	this.conn = nil
	this.in = nil
	this.out = nil
}

// processor() reads messages from the incoming buffer and processes them
func (this *service) processor() {
	defer func() {
		// Let's recover from panic
		if r := recover(); r != nil {
			//glog.Errorf("(%s) Recovering from panic: %v", this.cid(), r)
		}

		this.wgStopped.Done()
		this.stop()

		//glog.Debugf("(%s) Stopping processor", this.cid())
	}()

	glog.Debugf("(%s) Starting processor", this.cid())

	this.wgStarted.Done()

	for {
		// 1. Find out what message is next and the size of the message
		mtype, total, err := this.peekMessageSize()
		if err != nil {
			//if err != io.EOF {
			glog.Errorf("(%s) Error peeking next message size: %v", this.cid(), err)
			//}
			return
		}

		msg, n, err := this.peekMessage(mtype, total)
		if err != nil {
			//if err != io.EOF {
			glog.Errorf("(%s) Error peeking next message: %v", this.cid(), err)
			//}
			return
		}

		//glog.Debugf("(%s) Received: %s", this.cid(), msg)

		this.inStat.increment(int64(n))

		// 5. Process the read message
		err = this.processIncoming(msg)
		if err != nil {
			if err != errDisconnect {
				glog.Errorf("(%s) Error processing %s: %v", this.cid(), msg.Name(), err)
			} else {
				return
			}
		}

		// 7. We should commit the bytes in the buffer so we can move on
		_, err = this.in.ReadCommit(total)
		if err != nil {
			if err != io.EOF {
				glog.Errorf("(%s) Error committing %d read bytes: %v", this.cid(), total, err)
			}
			return
		}

		// 7. Check to see if done is closed, if so, exit
		if this.isDone() && this.in.Len() == 0 {
			return
		}

		//if this.inStat.msgs%1000 == 0 {
		//	glog.Debugf("(%s) Going to process message %d", this.cid(), this.inStat.msgs)
		//}
	}
}

func (this *service) processAcked(ackq *sessions.Ackqueue) {
	for _, ackmsg := range ackq.Acked() {
		// Let's get the messages from the saved message byte slices.
		msg, err := ackmsg.Mtype.New()
		if err != nil {
			glog.Errorf("process/processAcked: Unable to creating new %s message: %v", ackmsg.Mtype, err)
			continue
		}

		if _, err := msg.Decode(ackmsg.Msgbuf); err != nil {
			glog.Errorf("process/processAcked: Unable to decode %s message: %v", ackmsg.Mtype, err)
			continue
		}

		ack, err := ackmsg.State.New()
		if err != nil {
			glog.Errorf("process/processAcked: Unable to creating new %s message: %v", ackmsg.State, err)
			continue
		}

		if _, err := ack.Decode(ackmsg.Ackbuf); err != nil {
			glog.Errorf("process/processAcked: Unable to decode %s message: %v", ackmsg.State, err)
			continue
		}

		//glog.Debugf("(%s) Processing acked message: %v", this.cid(), ack)

		// - PUBACK if it's QoS 1 message. This is on the client side.
		// - PUBREL if it's QoS 2 message. This is on the server side.
		// - PUBCOMP if it's QoS 2 message. This is on the client side.
		// - SUBACK if it's a subscribe message. This is on the client side.
		// - UNSUBACK if it's a unsubscribe message. This is on the client side.
		switch ackmsg.State {
		case message.PUBREL:
			// If ack is PUBREL, that means the QoS 2 message sent by a remote client is
			// releassed, so let's publish it to other subscribers.
			if err = this.onPublish(msg.(*message.PublishMessage)); err != nil {
				glog.Errorf("(%s) Error processing ack'ed %s message: %v", this.cid(), ackmsg.Mtype, err)
			}

		case message.PUBACK, message.PUBCOMP, message.SUBACK, message.UNSUBACK, message.PINGRESP:
			glog.Debugf("process/processAcked: %s", ack)
			// If ack is PUBACK, that means the QoS 1 message sent by this service got
			// ack'ed. There's nothing to do other than calling onComplete() below.

			// If ack is PUBCOMP, that means the QoS 2 message sent by this service got
			// ack'ed. There's nothing to do other than calling onComplete() below.

			// If ack is SUBACK, that means the SUBSCRIBE message sent by this service
			// got ack'ed. There's nothing to do other than calling onComplete() below.

			// If ack is UNSUBACK, that means the SUBSCRIBE message sent by this service
			// got ack'ed. There's nothing to do other than calling onComplete() below.

			// If ack is PINGRESP, that means the PINGREQ message sent by this service
			// got ack'ed. There's nothing to do other than calling onComplete() below.

			err = nil

		default:
			glog.Errorf("(%s) Invalid ack message type %s.", this.cid(), ackmsg.State)
			continue
		}

		// Call the registered onComplete function
		if ackmsg.OnComplete != nil {
			onComplete, ok := ackmsg.OnComplete.(OnCompleteFunc)
			if !ok {
				glog.Errorf("process/processAcked: Error type asserting onComplete function: %v", reflect.TypeOf(ackmsg.OnComplete))
			} else if onComplete != nil {
				if err := onComplete(msg, ack, nil); err != nil {
					glog.Errorf("process/processAcked: Error running onComplete(): %v", err)
				}
			}
		}
	}
}