예제 #1
0
func (p *protocolV2) internalSUB(client *nsqd.ClientV2, params [][]byte, enableTrace bool,
	ordered bool, startFrom *ConsumeOffset) ([]byte, error) {

	state := atomic.LoadInt32(&client.State)
	if state != stateInit {
		nsqd.NsqLogger().LogWarningf("[%s] command in wrong state: %v", client, state)
		return nil, protocol.NewFatalClientErr(nil, E_INVALID, "cannot SUB in current state")
	}

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

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

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

	partition := -1
	channelName := ""
	var err error
	channelName = string(params[2])
	if !protocol.IsValidChannelName(channelName) {
		return nil, protocol.NewFatalClientErr(nil, "E_BAD_CHANNEL",
			fmt.Sprintf("SUB channel name %q is not valid", channelName))
	}

	if len(params) == 4 {
		partition, err = strconv.Atoi(string(params[3]))
		if err != nil {
			return nil, protocol.NewFatalClientErr(nil, "E_BAD_PARTITION",
				fmt.Sprintf("topic partition is not valid: %v", err))
		}
	}

	if err = p.CheckAuth(client, "SUB", topicName, channelName); err != nil {
		return nil, err
	}

	if partition == -1 {
		partition = p.ctx.getDefaultPartition(topicName)
	}

	topic, err := p.ctx.getExistingTopic(topicName, partition)
	if err != nil {
		nsqd.NsqLogger().Logf("sub to not existing topic: %v, err:%v", topicName, err.Error())
		return nil, protocol.NewFatalClientErr(nil, E_TOPIC_NOT_EXIST, "")
	}
	if !p.ctx.checkForMasterWrite(topicName, partition) {
		nsqd.NsqLogger().Logf("sub failed on not leader: %v-%v, remote is : %v", topicName, partition, client.RemoteAddr())
		// we need disable topic here to trigger a notify, maybe we failed to notify lookup last time.
		topic.DisableForSlave()
		return nil, protocol.NewFatalClientErr(nil, FailedOnNotLeader, "")
	}
	channel := topic.GetChannel(channelName)
	err = channel.AddClient(client.ID, client)
	if err != nil {
		nsqd.NsqLogger().Logf("sub failed to add client: %v, %v", client, err)
		return nil, protocol.NewFatalClientErr(nil, FailedOnNotWritable, "")
	}

	atomic.StoreInt32(&client.State, stateSubscribed)
	client.Channel = channel
	if enableTrace {
		nsqd.NsqLogger().Logf("sub channel %v with trace enabled, remote is : %v", channelName, client.RemoteAddr())
	}
	if ordered {
		if atomic.LoadInt32(&client.SampleRate) != 0 {
			nsqd.NsqLogger().Errorf("%v", ErrOrderChannelOnSampleRate)
			return nil, protocol.NewFatalClientErr(nil, E_INVALID, ErrOrderChannelOnSampleRate.Error())
		}
		channel.SetOrdered(true)
	}
	if startFrom != nil {
		cnt := channel.GetClientsCount()
		if cnt > 1 {
			nsqd.NsqLogger().LogDebugf("the consume offset: %v can only be set by the first client: %v", startFrom, cnt)
		} else {
			queueOffset, cnt, err := p.ctx.SetChannelOffset(channel, startFrom, false)
			if err != nil {
				return nil, protocol.NewFatalClientErr(nil, E_INVALID, err.Error())
			}
			nsqd.NsqLogger().Logf("set the channel offset: %v (actual set : %v:%v), by client:%v, %v",
				startFrom, queueOffset, cnt, client.String(), client.UserAgent)
		}
	}
	client.EnableTrace = enableTrace
	// update message pump
	client.SubEventChan <- channel

	return okBytes, nil
}