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
}