Golang nsq.NewFatalClientErr函数代码示例

func (p *ProtocolV2) REQ(client *ClientV2, params [][]byte) ([]byte, error) {
	state := atomic.LoadInt32(&client.State)
	if state != nsq.StateSubscribed && state != nsq.StateClosing {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot REQ in current state")
	}

	if len(params) < 3 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "REQ insufficient number of params")
	}

	id := *(*nsq.MessageID)(unsafe.Pointer(&params[1][0]))
	timeoutMs, err := util.ByteToBase10(params[2])
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_INVALID",
			fmt.Sprintf("REQ could not parse timeout %s", params[2]))
	}
	timeoutDuration := time.Duration(timeoutMs) * time.Millisecond

	if timeoutDuration < 0 || timeoutDuration > maxTimeout {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID",
			fmt.Sprintf("REQ timeout %d out of range 0-%d", timeoutDuration, maxTimeout))
	}

	err = client.Channel.RequeueMessage(client, id, timeoutDuration)
	if err != nil {
		return nil, nsq.NewClientErr(err, "E_REQ_FAILED",
			fmt.Sprintf("REQ %s failed %s", id, err.Error()))
	}

	client.RequeuedMessage()

	return nil, nil
}

func (p *ProtocolV2) RDY(client *ClientV2, params [][]byte) ([]byte, error) {
	state := atomic.LoadInt32(&client.State)

	if state == nsq.StateClosing {
		// just ignore ready changes on a closing channel
		log.Printf("PROTOCOL(V2): [%s] ignoring RDY after CLS in state ClientStateV2Closing", client)
		return nil, nil
	}

	if state != nsq.StateSubscribed {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot RDY in current state")
	}

	count := int64(1)
	if len(params) > 1 {
		b10, err := util.ByteToBase10(params[1])
		if err != nil {
			return nil, nsq.NewFatalClientErr(err, "E_INVALID",
				fmt.Sprintf("RDY could not parse count %s", params[1]))
		}
		count = int64(b10)
	}

	if count < 0 || count > nsqd.options.maxRdyCount {
		// this needs to be a fatal error otherwise clients would have
		// inconsistent state
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID",
			fmt.Sprintf("RDY count %d out of range 0-%d", count, nsqd.options.maxRdyCount))
	}

	client.SetReadyCount(count)

	return nil, nil
}

func (p *ProtocolV2) Exec(client *ClientV2, params [][]byte) ([]byte, error) {
	switch {
	case bytes.Equal(params[0], []byte("IDENTIFY")):
		return p.IDENTIFY(client, params)
	case bytes.Equal(params[0], []byte("SUB")):
		return p.SUB(client, params)
	case bytes.Equal(params[0], []byte("RDY")):
		return p.RDY(client, params)
	case bytes.Equal(params[0], []byte("FIN")):
		return p.FIN(client, params)
	case bytes.Equal(params[0], []byte("REQ")):
		return p.REQ(client, params)
	case bytes.Equal(params[0], []byte("CLS")):
		return p.CLS(client, params)
	case bytes.Equal(params[0], []byte("NOP")):
		return p.NOP(client, params)
	case bytes.Equal(params[0], []byte("PUB")):
		return p.PUB(client, params)
	case bytes.Equal(params[0], []byte("MPUB")):
		return p.MPUB(client, params)
	case bytes.Equal(params[0], []byte("TOUCH")):
		return p.TOUCH(client, params)
	}
	return nil, nsq.NewFatalClientErr(nil, "E_INVALID", fmt.Sprintf("invalid command %s", params[0]))
}

func (p *LookupProtocolV1) REGISTER(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
	if client.peerInfo == nil {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "client must IDENTIFY")
	}

	topic, channel, err := getTopicChan("REGISTER", params)
	if err != nil {
		return nil, err
	}

	if channel != "" {
		key := Registration{"channel", topic, channel}
		if lookupd.DB.AddProducer(key, &Producer{peerInfo: client.peerInfo}) {
			log.Printf("DB: client(%s) REGISTER category:%s key:%s subkey:%s",
				client, "channel", topic, channel)
		}
	}
	key := Registration{"topic", topic, ""}
	if lookupd.DB.AddProducer(key, &Producer{peerInfo: client.peerInfo}) {
		log.Printf("DB: client(%s) REGISTER category:%s key:%s subkey:%s",
			client, "topic", topic, "")
	}

	return []byte("OK"), nil
}

func (p *ProtocolV2) CLS(client *ClientV2, params [][]byte) ([]byte, error) {
	if atomic.LoadInt32(&client.State) != nsq.StateSubscribed {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot CLS in current state")
	}

	client.StartClose()

	return []byte("CLOSE_WAIT"), nil
}

func (p *ProtocolV2) TOUCH(client *ClientV2, params [][]byte) ([]byte, error) {
	state := atomic.LoadInt32(&client.State)
	if state != nsq.StateSubscribed && state != nsq.StateClosing {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot TOUCH in current state")
	}

	if len(params) < 2 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "TOUCH insufficient number of params")
	}

	id := *(*nsq.MessageID)(unsafe.Pointer(&params[1][0]))
	err := client.Channel.TouchMessage(client, id)
	if err != nil {
		return nil, nsq.NewClientErr(err, "E_TOUCH_FAILED",
			fmt.Sprintf("TOUCH %s failed %s", id, err.Error()))
	}

	return nil, nil
}

func getTopicChan(command string, params []string) (string, string, error) {
	if len(params) == 0 {
		return "", "", nsq.NewFatalClientErr(nil, "E_INVALID", fmt.Sprintf("%s insufficient number of params", command))
	}

	topicName := params[0]
	var channelName string
	if len(params) >= 2 {
		channelName = params[1]
	}

	if !nsq.IsValidTopicName(topicName) {
		return "", "", nsq.NewFatalClientErr(nil, "E_BAD_TOPIC", fmt.Sprintf("%s topic name '%s' is not valid", command, topicName))
	}

	if channelName != "" && !nsq.IsValidChannelName(channelName) {
		return "", "", nsq.NewFatalClientErr(nil, "E_BAD_CHANNEL", fmt.Sprintf("%s channel name '%s' is not valid", command, channelName))
	}

	return topicName, channelName, nil
}

func (p *ProtocolV2) IDENTIFY(client *ClientV2, params [][]byte) ([]byte, error) {
	var err error

	if atomic.LoadInt32(&client.State) != nsq.StateInit {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot IDENTIFY in current state")
	}

	var bodyLen int32
	err = binary.Read(client.Reader, binary.BigEndian, &bodyLen)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body size")
	}

	if int64(bodyLen) > nsqd.options.maxBodySize {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_BODY",
			fmt.Sprintf("IDENTIFY body too big %d > %d", bodyLen, nsqd.options.maxBodySize))
	}

	body := make([]byte, bodyLen)
	_, err = io.ReadFull(client.Reader, body)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body")
	}

	// body is a json structure with producer information
	clientInfo := struct {
		ShortId           string `json:"short_id"`
		LongId            string `json:"long_id"`
		HeartbeatInterval int    `json:"heartbeat_interval"`
	}{}
	err = json.Unmarshal(body, &clientInfo)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to decode JSON body")
	}

	client.ShortIdentifier = clientInfo.ShortId
	client.LongIdentifier = clientInfo.LongId

	var interval time.Duration
	switch {
	case clientInfo.HeartbeatInterval == -1:
		interval = -1
	case clientInfo.HeartbeatInterval == 0:
	case clientInfo.HeartbeatInterval >= 1000 && clientInfo.HeartbeatInterval <= 60000:
		interval = (time.Duration(clientInfo.HeartbeatInterval) * time.Millisecond)
	default:
		return nil, nsq.NewFatalClientErr(err, "E_INVALID", "IDENTIFY Invalid heartbeat_interval")
	}

	// leave the default heartbeat in place
	if clientInfo.HeartbeatInterval != 0 {
		select {
		case client.HeartbeatUpdateChan <- interval:
		default:
		}
		client.HeartbeatInterval = interval
	}

	return []byte("OK"), nil
}

func (p *LookupProtocolV1) Exec(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
	switch params[0] {
	case "PING":
		return p.PING(client, params)
	case "IDENTIFY":
		return p.IDENTIFY(client, reader, params[1:])
	case "REGISTER":
		return p.REGISTER(client, reader, params[1:])
	case "UNREGISTER":
		return p.UNREGISTER(client, reader, params[1:])
	}
	return nil, nsq.NewFatalClientErr(nil, "E_INVALID", fmt.Sprintf("invalid command %s", params[0]))
}

func (p *ProtocolV2) IDENTIFY(client *ClientV2, params [][]byte) ([]byte, error) {
	var err error

	if atomic.LoadInt32(&client.State) != nsq.StateInit {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot IDENTIFY in current state")
	}

	bodyLen, err := p.readLen(client)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body size")
	}

	if int64(bodyLen) > nsqd.options.maxBodySize {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_BODY",
			fmt.Sprintf("IDENTIFY body too big %d > %d", bodyLen, nsqd.options.maxBodySize))
	}

	body := make([]byte, bodyLen)
	_, err = io.ReadFull(client.Reader, body)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body")
	}

	// body is a json structure with producer information
	clientInfo := struct {
		ShortId            string `json:"short_id"`
		LongId             string `json:"long_id"`
		HeartbeatInterval  int    `json:"heartbeat_interval"`
		FeatureNegotiation bool   `json:"feature_negotiation"`
	}{}
	err = json.Unmarshal(body, &clientInfo)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to decode JSON body")
	}

	client.ShortIdentifier = clientInfo.ShortId
	client.LongIdentifier = clientInfo.LongId
	err = client.SetHeartbeatInterval(clientInfo.HeartbeatInterval)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY "+err.Error())
	}

	resp := okBytes
	if clientInfo.FeatureNegotiation {
		resp, err = json.Marshal(struct {
			MaxRdyCount int64  `json:"max_rdy_count"`
			Version     string `json:"version"`
		}{
			MaxRdyCount: nsqd.options.maxRdyCount,
			Version:     util.BINARY_VERSION,
		})
		if err != nil {
			panic("should never happen")
		}
	}

	return resp, nil
}

func (p *ProtocolV2) FIN(client *ClientV2, params [][]byte) ([]byte, error) {
	var id nsq.MessageID

	state := atomic.LoadInt32(&client.State)
	if state != nsq.StateSubscribed && state != nsq.StateClosing {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot FIN in current state")
	}

	if len(params) < 2 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "FIN insufficient number of params")
	}

	copy(id[:], params[1])
	err := client.Channel.FinishMessage(client, id)
	if err != nil {
		return nil, nsq.NewClientErr(err, "E_FIN_FAILED",
			fmt.Sprintf("FIN %s failed %s", id, err.Error()))
	}

	client.FinishedMessage()

	return nil, nil
}

func (p *ProtocolV2) SUB(client *ClientV2, params [][]byte) ([]byte, error) {
	if atomic.LoadInt32(&client.State) != nsq.StateInit {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot SUB in current state")
	}

	if client.HeartbeatInterval < 0 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot SUB with heartbeats disabled")
	}

	if len(params) < 3 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "SUB insufficient number of parameters")
	}

	topicName := string(params[1])
	if !nsq.IsValidTopicName(topicName) {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_TOPIC",
			fmt.Sprintf("SUB topic name '%s' is not valid", topicName))
	}

	channelName := string(params[2])
	if !nsq.IsValidChannelName(channelName) {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_CHANNEL",
			fmt.Sprintf("SUB channel name '%s' is not valid", channelName))
	}

	topic := nsqd.GetTopic(topicName)
	channel := topic.GetChannel(channelName)
	channel.AddClient(client)

	atomic.StoreInt32(&client.State, nsq.StateSubscribed)
	client.Channel = channel
	// update message pump
	client.SubEventChan <- channel

	return okBytes, nil
}

func (p *ProtocolV2) IDENTIFY(client *ClientV2, params [][]byte) ([]byte, error) {
	var err error

	if atomic.LoadInt32(&client.State) != nsq.StateInit {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "cannot IDENTIFY in current state")
	}

	bodyLen, err := p.readLen(client)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body size")
	}

	if int64(bodyLen) > nsqd.options.maxBodySize {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_BODY",
			fmt.Sprintf("IDENTIFY body too big %d > %d", bodyLen, nsqd.options.maxBodySize))
	}

	body := make([]byte, bodyLen)
	_, err = io.ReadFull(client.Reader, body)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body")
	}

	// body is a json structure with producer information
	var identifyData IdentifyDataV2
	err = json.Unmarshal(body, &identifyData)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to decode JSON body")
	}

	err = client.Identify(identifyData)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY "+err.Error())
	}

	resp := okBytes
	if identifyData.FeatureNegotiation {
		resp, err = json.Marshal(struct {
			MaxRdyCount   int64  `json:"max_rdy_count"`
			Version       string `json:"version"`
			MaxMsgTimeout int64  `json:"max_msg_timeout"`
			MsgTimeout    int64  `json:"msg_timeout"`
		}{
			MaxRdyCount:   nsqd.options.maxRdyCount,
			Version:       util.BINARY_VERSION,
			MaxMsgTimeout: int64(nsqd.options.maxMsgTimeout / time.Millisecond),
			MsgTimeout:    int64(nsqd.options.msgTimeout / time.Millisecond),
		})
		if err != nil {
			panic("should never happen")
		}
	}

	return resp, nil
}

func (p *LookupProtocolV1) UNREGISTER(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
	if client.peerInfo == nil {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "client must IDENTIFY")
	}

	topic, channel, err := getTopicChan("UNREGISTER", params)
	if err != nil {
		return nil, err
	}

	if channel != "" {
		key := Registration{"channel", topic, channel}
		removed, left := lookupd.DB.RemoveProducer(key, client.peerInfo.id)
		if removed {
			log.Printf("DB: client(%s) UNREGISTER category:%s key:%s subkey:%s",
				client, "channel", topic, channel)
		}
		// for ephemeral channels, remove the channel as well if it has no producers
		if left == 0 && strings.HasSuffix(channel, "#ephemeral") {
			lookupd.DB.RemoveRegistration(key)
		}
	} else {
		// no channel was specified so this is a topic unregistration
		// remove all of the channel registrations...
		// normally this shouldn't happen which is why we print a warning message
		// if anything is actually removed
		registrations := lookupd.DB.FindRegistrations("channel", topic, "*")
		for _, r := range registrations {
			if removed, _ := lookupd.DB.RemoveProducer(*r, client.peerInfo.id); removed {
				log.Printf("WARNING: client(%s) unexpected UNREGISTER category:%s key:%s subkey:%s",
					client, "channel", topic, r.SubKey)
			}
		}

		key := Registration{"topic", topic, ""}
		if removed, _ := lookupd.DB.RemoveProducer(key, client.peerInfo.id); removed {
			log.Printf("DB: client(%s) UNREGISTER category:%s key:%s subkey:%s",
				client, "topic", topic, "")
		}
	}

	return []byte("OK"), nil
}

func (p *ProtocolV2) PUB(client *ClientV2, params [][]byte) ([]byte, error) {
	var err error
	var bodyLen int32

	if len(params) < 2 {
		return nil, nsq.NewFatalClientErr(nil, "E_INVALID", "PUB insufficient number of parameters")
	}

	topicName := string(params[1])
	if !nsq.IsValidTopicName(topicName) {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_TOPIC",
			fmt.Sprintf("PUB topic name '%s' is not valid", topicName))
	}

	err = binary.Read(client.Reader, binary.BigEndian, &bodyLen)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_MESSAGE", "PUB failed to read message body size")
	}

	if int64(bodyLen) > nsqd.options.maxMessageSize {
		return nil, nsq.NewFatalClientErr(nil, "E_BAD_MESSAGE",
			fmt.Sprintf("PUB message too big %d > %d", bodyLen, nsqd.options.maxMessageSize))
	}

	messageBody := make([]byte, bodyLen)
	_, err = io.ReadFull(client.Reader, messageBody)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_BAD_MESSAGE", "PUB failed to read message body")
	}

	topic := nsqd.GetTopic(topicName)
	msg := nsq.NewMessage(<-nsqd.idChan, messageBody)
	err = topic.PutMessage(msg)
	if err != nil {
		return nil, nsq.NewFatalClientErr(err, "E_PUB_FAILED", "PUB failed "+err.Error())
	}

	return []byte("OK"), nil
}