/
mq_msgstream.go
831 lines (748 loc) · 23.1 KB
/
mq_msgstream.go
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// Licensed to the LF AI & Data foundation under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package msgstream
import (
"context"
"fmt"
"path/filepath"
"sync"
"sync/atomic"
"time"
"github.com/cockroachdb/errors"
"github.com/golang/protobuf/proto"
"github.com/milvus-io/milvus-proto/go-api/commonpb"
"github.com/milvus-io/milvus-proto/go-api/msgpb"
"go.uber.org/zap"
"github.com/milvus-io/milvus/pkg/log"
"github.com/milvus-io/milvus/pkg/mq/msgstream/mqwrapper"
"github.com/milvus-io/milvus/pkg/util/retry"
"github.com/milvus-io/milvus/pkg/util/typeutil"
)
var _ MsgStream = (*mqMsgStream)(nil)
type mqMsgStream struct {
ctx context.Context
client mqwrapper.Client
producers map[string]mqwrapper.Producer
producerChannels []string
consumers map[string]mqwrapper.Consumer
consumerChannels []string
repackFunc RepackFunc
unmarshal UnmarshalDispatcher
receiveBuf chan *MsgPack
closeRWMutex *sync.RWMutex
streamCancel func()
bufSize int64
producerLock *sync.Mutex
consumerLock *sync.Mutex
closed int32
onceChan sync.Once
}
// NewMqMsgStream is used to generate a new mqMsgStream object
func NewMqMsgStream(ctx context.Context,
receiveBufSize int64,
bufSize int64,
client mqwrapper.Client,
unmarshal UnmarshalDispatcher) (*mqMsgStream, error) {
streamCtx, streamCancel := context.WithCancel(ctx)
producers := make(map[string]mqwrapper.Producer)
consumers := make(map[string]mqwrapper.Consumer)
producerChannels := make([]string, 0)
consumerChannels := make([]string, 0)
receiveBuf := make(chan *MsgPack, receiveBufSize)
stream := &mqMsgStream{
ctx: streamCtx,
client: client,
producers: producers,
producerChannels: producerChannels,
consumers: consumers,
consumerChannels: consumerChannels,
unmarshal: unmarshal,
bufSize: bufSize,
receiveBuf: receiveBuf,
streamCancel: streamCancel,
producerLock: &sync.Mutex{},
consumerLock: &sync.Mutex{},
closeRWMutex: &sync.RWMutex{},
closed: 0,
}
return stream, nil
}
// AsProducer create producer to send message to channels
func (ms *mqMsgStream) AsProducer(channels []string) {
for _, channel := range channels {
if len(channel) == 0 {
log.Error("MsgStream asProducer's channel is an empty string")
break
}
fn := func() error {
pp, err := ms.client.CreateProducer(mqwrapper.ProducerOptions{Topic: channel, EnableCompression: true})
if err != nil {
return err
}
if pp == nil {
return errors.New("Producer is nil")
}
ms.producerLock.Lock()
defer ms.producerLock.Unlock()
ms.producers[channel] = pp
ms.producerChannels = append(ms.producerChannels, channel)
return nil
}
err := retry.Do(context.TODO(), fn, retry.Attempts(20), retry.Sleep(time.Millisecond*200), retry.MaxSleepTime(5*time.Second))
if err != nil {
errMsg := "Failed to create producer " + channel + ", error = " + err.Error()
panic(errMsg)
}
}
}
func (ms *mqMsgStream) GetLatestMsgID(channel string) (MessageID, error) {
lastMsg, err := ms.consumers[channel].GetLatestMsgID()
if err != nil {
errMsg := "Failed to get latest MsgID from channel: " + channel + ", error = " + err.Error()
return nil, errors.New(errMsg)
}
return lastMsg, nil
}
func (ms *mqMsgStream) CheckTopicValid(channel string) error {
err := ms.consumers[channel].CheckTopicValid(channel)
if err != nil {
return err
}
return nil
}
// AsConsumerWithPosition Create consumer to receive message from channels, with initial position
// if initial position is set to latest, last message in the channel is exclusive
func (ms *mqMsgStream) AsConsumer(channels []string, subName string, position mqwrapper.SubscriptionInitialPosition) {
for _, channel := range channels {
if _, ok := ms.consumers[channel]; ok {
continue
}
fn := func() error {
pc, err := ms.client.Subscribe(mqwrapper.ConsumerOptions{
Topic: channel,
SubscriptionName: subName,
SubscriptionInitialPosition: position,
BufSize: ms.bufSize,
})
if err != nil {
return err
}
if pc == nil {
return errors.New("Consumer is nil")
}
ms.consumerLock.Lock()
defer ms.consumerLock.Unlock()
ms.consumers[channel] = pc
ms.consumerChannels = append(ms.consumerChannels, channel)
return nil
}
// TODO if know the former subscribe is invalid, should we use pulsarctl to accelerate recovery speed
err := retry.Do(context.TODO(), fn, retry.Attempts(50), retry.Sleep(time.Millisecond*200), retry.MaxSleepTime(5*time.Second))
if err != nil {
errMsg := "Failed to create consumer " + channel + ", error = " + err.Error()
panic(errMsg)
}
log.Info("Successfully create consumer", zap.String("channel", channel), zap.String("subname", subName))
}
}
func (ms *mqMsgStream) SetRepackFunc(repackFunc RepackFunc) {
ms.repackFunc = repackFunc
}
func (ms *mqMsgStream) Close() {
log.Info("start to close mq msg stream",
zap.Int("producer num", len(ms.producers)),
zap.Int("consumer num", len(ms.consumers)))
ms.streamCancel()
ms.closeRWMutex.Lock()
defer ms.closeRWMutex.Unlock()
if !atomic.CompareAndSwapInt32(&ms.closed, 0, 1) {
return
}
for _, producer := range ms.producers {
if producer != nil {
producer.Close()
}
}
for _, consumer := range ms.consumers {
if consumer != nil {
consumer.Close()
}
}
ms.client.Close()
close(ms.receiveBuf)
}
func (ms *mqMsgStream) ComputeProduceChannelIndexes(tsMsgs []TsMsg) [][]int32 {
if len(tsMsgs) <= 0 {
return nil
}
reBucketValues := make([][]int32, len(tsMsgs))
channelNum := uint32(len(ms.producerChannels))
if channelNum == 0 {
return nil
}
for idx, tsMsg := range tsMsgs {
hashValues := tsMsg.HashKeys()
bucketValues := make([]int32, len(hashValues))
for index, hashValue := range hashValues {
bucketValues[index] = int32(hashValue % channelNum)
}
reBucketValues[idx] = bucketValues
}
return reBucketValues
}
func (ms *mqMsgStream) GetProduceChannels() []string {
return ms.producerChannels
}
func (ms *mqMsgStream) Produce(msgPack *MsgPack) error {
if msgPack == nil || len(msgPack.Msgs) <= 0 {
log.Debug("Warning: Receive empty msgPack")
return nil
}
if len(ms.producers) <= 0 {
return errors.New("nil producer in msg stream")
}
tsMsgs := msgPack.Msgs
reBucketValues := ms.ComputeProduceChannelIndexes(msgPack.Msgs)
var result map[int32]*MsgPack
var err error
if ms.repackFunc != nil {
result, err = ms.repackFunc(tsMsgs, reBucketValues)
} else {
msgType := (tsMsgs[0]).Type()
switch msgType {
case commonpb.MsgType_Insert:
result, err = InsertRepackFunc(tsMsgs, reBucketValues)
case commonpb.MsgType_Delete:
result, err = DeleteRepackFunc(tsMsgs, reBucketValues)
default:
result, err = DefaultRepackFunc(tsMsgs, reBucketValues)
}
}
if err != nil {
return err
}
for k, v := range result {
channel := ms.producerChannels[k]
for i := 0; i < len(v.Msgs); i++ {
spanCtx, sp := MsgSpanFromCtx(v.Msgs[i].TraceCtx(), v.Msgs[i])
defer sp.End()
mb, err := v.Msgs[i].Marshal(v.Msgs[i])
if err != nil {
return err
}
m, err := convertToByteArray(mb)
if err != nil {
return err
}
msg := &mqwrapper.ProducerMessage{Payload: m, Properties: map[string]string{}}
InjectCtx(spanCtx, msg.Properties)
ms.producerLock.Lock()
if _, err := ms.producers[channel].Send(spanCtx, msg); err != nil {
ms.producerLock.Unlock()
sp.RecordError(err)
return err
}
ms.producerLock.Unlock()
}
}
return nil
}
// BroadcastMark broadcast msg pack to all producers and returns corresponding msg id
// the returned message id serves as marking
func (ms *mqMsgStream) Broadcast(msgPack *MsgPack) (map[string][]MessageID, error) {
ids := make(map[string][]MessageID)
if msgPack == nil || len(msgPack.Msgs) <= 0 {
return ids, errors.New("empty msgs")
}
for _, v := range msgPack.Msgs {
spanCtx, sp := MsgSpanFromCtx(v.TraceCtx(), v)
mb, err := v.Marshal(v)
if err != nil {
return ids, err
}
m, err := convertToByteArray(mb)
if err != nil {
return ids, err
}
msg := &mqwrapper.ProducerMessage{Payload: m, Properties: map[string]string{}}
InjectCtx(spanCtx, msg.Properties)
ms.producerLock.Lock()
for channel, producer := range ms.producers {
id, err := producer.Send(spanCtx, msg)
if err != nil {
ms.producerLock.Unlock()
sp.RecordError(err)
sp.End()
return ids, err
}
ids[channel] = append(ids[channel], id)
}
ms.producerLock.Unlock()
sp.End()
}
return ids, nil
}
func (ms *mqMsgStream) getTsMsgFromConsumerMsg(msg mqwrapper.Message) (TsMsg, error) {
header := commonpb.MsgHeader{}
if msg.Payload() == nil {
return nil, fmt.Errorf("failed to unmarshal message header, payload is empty")
}
err := proto.Unmarshal(msg.Payload(), &header)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal message header, err %s", err.Error())
}
if header.Base == nil {
return nil, fmt.Errorf("failed to unmarshal message, header is uncomplete")
}
tsMsg, err := ms.unmarshal.Unmarshal(msg.Payload(), header.Base.MsgType)
if err != nil {
return nil, fmt.Errorf("failed to unmarshal tsMsg, err %s", err.Error())
}
// set msg info to tsMsg
tsMsg.SetPosition(&MsgPosition{
ChannelName: filepath.Base(msg.Topic()),
MsgID: msg.ID().Serialize(),
})
return tsMsg, nil
}
func (ms *mqMsgStream) receiveMsg(consumer mqwrapper.Consumer) {
ms.closeRWMutex.RLock()
defer ms.closeRWMutex.RUnlock()
if atomic.LoadInt32(&ms.closed) != 0 {
return
}
for {
select {
case <-ms.ctx.Done():
return
case msg, ok := <-consumer.Chan():
if !ok {
return
}
consumer.Ack(msg)
if msg.Payload() == nil {
log.Warn("MqMsgStream get msg whose payload is nil")
continue
}
tsMsg, err := ms.getTsMsgFromConsumerMsg(msg)
if err != nil {
log.Error("Failed to getTsMsgFromConsumerMsg", zap.Error(err))
continue
}
pos := tsMsg.Position()
tsMsg.SetPosition(&MsgPosition{
ChannelName: pos.ChannelName,
MsgID: pos.MsgID,
MsgGroup: consumer.Subscription(),
Timestamp: tsMsg.BeginTs(),
})
ctx, _ := ExtractCtx(tsMsg, msg.Properties())
tsMsg.SetTraceCtx(ctx)
msgPack := MsgPack{
Msgs: []TsMsg{tsMsg},
StartPositions: []*msgpb.MsgPosition{tsMsg.Position()},
EndPositions: []*msgpb.MsgPosition{tsMsg.Position()},
}
select {
case ms.receiveBuf <- &msgPack:
case <-ms.ctx.Done():
return
}
}
}
}
func (ms *mqMsgStream) Chan() <-chan *MsgPack {
ms.onceChan.Do(func() {
for _, c := range ms.consumers {
go ms.receiveMsg(c)
}
})
return ms.receiveBuf
}
// Seek reset the subscription associated with this consumer to a specific position, the seek position is exclusive
// User has to ensure mq_msgstream is not closed before seek, and the seek position is already written.
func (ms *mqMsgStream) Seek(msgPositions []*msgpb.MsgPosition) error {
for _, mp := range msgPositions {
consumer, ok := ms.consumers[mp.ChannelName]
if !ok {
return fmt.Errorf("channel %s not subscribed", mp.ChannelName)
}
messageID, err := ms.client.BytesToMsgID(mp.MsgID)
if err != nil {
return err
}
log.Info("MsgStream seek begin", zap.String("channel", mp.ChannelName), zap.Any("MessageID", mp.MsgID))
err = consumer.Seek(messageID, false)
if err != nil {
log.Warn("Failed to seek", zap.String("channel", mp.ChannelName), zap.Error(err))
return err
}
log.Info("MsgStream seek finished", zap.String("channel", mp.ChannelName))
}
return nil
}
var _ MsgStream = (*MqTtMsgStream)(nil)
// MqTtMsgStream is a msgstream that contains timeticks
type MqTtMsgStream struct {
*mqMsgStream
chanMsgBuf map[mqwrapper.Consumer][]TsMsg
chanMsgPos map[mqwrapper.Consumer]*msgpb.MsgPosition
chanStopChan map[mqwrapper.Consumer]chan bool
chanTtMsgTime map[mqwrapper.Consumer]Timestamp
chanMsgBufMutex *sync.Mutex
chanTtMsgTimeMutex *sync.RWMutex
chanWaitGroup *sync.WaitGroup
lastTimeStamp Timestamp
syncConsumer chan int
}
// NewMqTtMsgStream is used to generate a new MqTtMsgStream object
func NewMqTtMsgStream(ctx context.Context,
receiveBufSize int64,
bufSize int64,
client mqwrapper.Client,
unmarshal UnmarshalDispatcher) (*MqTtMsgStream, error) {
msgStream, err := NewMqMsgStream(ctx, receiveBufSize, bufSize, client, unmarshal)
if err != nil {
return nil, err
}
chanMsgBuf := make(map[mqwrapper.Consumer][]TsMsg)
chanMsgPos := make(map[mqwrapper.Consumer]*msgpb.MsgPosition)
chanStopChan := make(map[mqwrapper.Consumer]chan bool)
chanTtMsgTime := make(map[mqwrapper.Consumer]Timestamp)
syncConsumer := make(chan int, 1)
return &MqTtMsgStream{
mqMsgStream: msgStream,
chanMsgBuf: chanMsgBuf,
chanMsgPos: chanMsgPos,
chanStopChan: chanStopChan,
chanTtMsgTime: chanTtMsgTime,
chanMsgBufMutex: &sync.Mutex{},
chanTtMsgTimeMutex: &sync.RWMutex{},
chanWaitGroup: &sync.WaitGroup{},
syncConsumer: syncConsumer,
}, nil
}
func (ms *MqTtMsgStream) addConsumer(consumer mqwrapper.Consumer, channel string) {
if len(ms.consumers) == 0 {
ms.syncConsumer <- 1
}
ms.consumers[channel] = consumer
ms.consumerChannels = append(ms.consumerChannels, channel)
ms.chanMsgBuf[consumer] = make([]TsMsg, 0)
ms.chanMsgPos[consumer] = &msgpb.MsgPosition{
ChannelName: channel,
MsgID: make([]byte, 0),
Timestamp: ms.lastTimeStamp,
}
ms.chanStopChan[consumer] = make(chan bool)
ms.chanTtMsgTime[consumer] = 0
}
// AsConsumerWithPosition subscribes channels as consumer for a MsgStream and seeks to a certain position.
func (ms *MqTtMsgStream) AsConsumer(channels []string, subName string, position mqwrapper.SubscriptionInitialPosition) {
for _, channel := range channels {
if _, ok := ms.consumers[channel]; ok {
continue
}
fn := func() error {
pc, err := ms.client.Subscribe(mqwrapper.ConsumerOptions{
Topic: channel,
SubscriptionName: subName,
SubscriptionInitialPosition: position,
BufSize: ms.bufSize,
})
if err != nil {
return err
}
if pc == nil {
return errors.New("Consumer is nil")
}
ms.consumerLock.Lock()
defer ms.consumerLock.Unlock()
ms.addConsumer(pc, channel)
return nil
}
err := retry.Do(context.TODO(), fn, retry.Attempts(20), retry.Sleep(time.Millisecond*200), retry.MaxSleepTime(5*time.Second))
if err != nil {
errMsg := "Failed to create consumer " + channel + ", error = " + err.Error()
panic(errMsg)
}
}
}
// Close will stop goroutine and free internal producers and consumers
func (ms *MqTtMsgStream) Close() {
close(ms.syncConsumer)
ms.mqMsgStream.Close()
}
func isDMLMsg(msg TsMsg) bool {
return msg.Type() == commonpb.MsgType_Insert || msg.Type() == commonpb.MsgType_Delete
}
func (ms *MqTtMsgStream) bufMsgPackToChannel() {
ms.closeRWMutex.RLock()
defer ms.closeRWMutex.RUnlock()
if atomic.LoadInt32(&ms.closed) != 0 {
return
}
chanTtMsgSync := make(map[mqwrapper.Consumer]bool)
// block here until addConsumer
if _, ok := <-ms.syncConsumer; !ok {
log.Warn("consumer closed!")
return
}
for {
select {
case <-ms.ctx.Done():
return
default:
ms.consumerLock.Lock()
// wait all channels get ttMsg
for _, consumer := range ms.consumers {
if !chanTtMsgSync[consumer] {
ms.chanWaitGroup.Add(1)
go ms.consumeToTtMsg(consumer)
}
}
ms.chanWaitGroup.Wait()
// block here until all channels reach same timetick
currTs, ok := ms.allChanReachSameTtMsg(chanTtMsgSync)
if !ok || currTs <= ms.lastTimeStamp {
//log.Printf("All timeTick's timestamps are inconsistent")
ms.consumerLock.Unlock()
continue
}
timeTickBuf := make([]TsMsg, 0)
startMsgPosition := make([]*msgpb.MsgPosition, 0)
endMsgPositions := make([]*msgpb.MsgPosition, 0)
ms.chanMsgBufMutex.Lock()
for consumer, msgs := range ms.chanMsgBuf {
if len(msgs) == 0 {
continue
}
tempBuffer := make([]TsMsg, 0)
var timeTickMsg TsMsg
for _, v := range msgs {
if v.Type() == commonpb.MsgType_TimeTick {
timeTickMsg = v
continue
}
if v.EndTs() <= currTs {
timeTickBuf = append(timeTickBuf, v)
//log.Debug("pack msg", zap.Uint64("curr", v.EndTs()), zap.Uint64("currTs", currTs))
} else {
tempBuffer = append(tempBuffer, v)
}
}
ms.chanMsgBuf[consumer] = tempBuffer
startMsgPosition = append(startMsgPosition, proto.Clone(ms.chanMsgPos[consumer]).(*msgpb.MsgPosition))
var newPos *msgpb.MsgPosition
if len(tempBuffer) > 0 {
// if tempBuffer is not empty, use tempBuffer[0] to seek
newPos = &msgpb.MsgPosition{
ChannelName: tempBuffer[0].Position().ChannelName,
MsgID: tempBuffer[0].Position().MsgID,
Timestamp: currTs,
MsgGroup: consumer.Subscription(),
}
endMsgPositions = append(endMsgPositions, newPos)
} else if timeTickMsg != nil {
// if tempBuffer is empty, use timeTickMsg to seek
newPos = &msgpb.MsgPosition{
ChannelName: timeTickMsg.Position().ChannelName,
MsgID: timeTickMsg.Position().MsgID,
Timestamp: currTs,
MsgGroup: consumer.Subscription(),
}
endMsgPositions = append(endMsgPositions, newPos)
}
ms.chanMsgPos[consumer] = newPos
}
ms.chanMsgBufMutex.Unlock()
ms.consumerLock.Unlock()
idset := make(typeutil.UniqueSet)
uniqueMsgs := make([]TsMsg, 0, len(timeTickBuf))
for _, msg := range timeTickBuf {
if isDMLMsg(msg) && idset.Contain(msg.ID()) {
log.Warn("mqTtMsgStream, found duplicated msg", zap.Int64("msgID", msg.ID()))
continue
}
idset.Insert(msg.ID())
uniqueMsgs = append(uniqueMsgs, msg)
}
msgPack := MsgPack{
BeginTs: ms.lastTimeStamp,
EndTs: currTs,
Msgs: uniqueMsgs,
StartPositions: startMsgPosition,
EndPositions: endMsgPositions,
}
//log.Debug("send msg pack", zap.Int("len", len(msgPack.Msgs)), zap.Uint64("currTs", currTs))
select {
case ms.receiveBuf <- &msgPack:
case <-ms.ctx.Done():
return
}
ms.lastTimeStamp = currTs
}
}
}
// Save all msgs into chanMsgBuf[] till receive one ttMsg
func (ms *MqTtMsgStream) consumeToTtMsg(consumer mqwrapper.Consumer) {
defer ms.chanWaitGroup.Done()
for {
select {
case <-ms.ctx.Done():
return
case <-ms.chanStopChan[consumer]:
return
case msg, ok := <-consumer.Chan():
if !ok {
log.Debug("consumer closed!")
return
}
consumer.Ack(msg)
if msg.Payload() == nil {
log.Warn("MqTtMsgStream get msg whose payload is nil")
continue
}
tsMsg, err := ms.getTsMsgFromConsumerMsg(msg)
if err != nil {
log.Error("Failed to getTsMsgFromConsumerMsg", zap.Error(err))
continue
}
ms.chanMsgBufMutex.Lock()
ms.chanMsgBuf[consumer] = append(ms.chanMsgBuf[consumer], tsMsg)
ms.chanMsgBufMutex.Unlock()
if tsMsg.Type() == commonpb.MsgType_TimeTick {
ms.chanTtMsgTimeMutex.Lock()
ms.chanTtMsgTime[consumer] = tsMsg.(*TimeTickMsg).Base.Timestamp
ms.chanTtMsgTimeMutex.Unlock()
return
}
}
}
}
// return true only when all channels reach same timetick
func (ms *MqTtMsgStream) allChanReachSameTtMsg(chanTtMsgSync map[mqwrapper.Consumer]bool) (Timestamp, bool) {
tsMap := make(map[Timestamp]int)
var maxTime Timestamp
for _, t := range ms.chanTtMsgTime {
tsMap[t]++
if t > maxTime {
maxTime = t
}
}
// when all channels reach same timetick, timeMap should contain only 1 timestamp
if len(tsMap) <= 1 {
for consumer := range ms.chanTtMsgTime {
chanTtMsgSync[consumer] = false
}
return maxTime, true
}
for consumer := range ms.chanTtMsgTime {
ms.chanTtMsgTimeMutex.RLock()
chanTtMsgSync[consumer] = (ms.chanTtMsgTime[consumer] == maxTime)
ms.chanTtMsgTimeMutex.RUnlock()
}
return 0, false
}
// Seek to the specified position
func (ms *MqTtMsgStream) Seek(msgPositions []*msgpb.MsgPosition) error {
var consumer mqwrapper.Consumer
var mp *MsgPosition
var err error
fn := func() error {
var ok bool
consumer, ok = ms.consumers[mp.ChannelName]
if !ok {
return fmt.Errorf("please subcribe the channel, channel name =%s", mp.ChannelName)
}
if consumer == nil {
return fmt.Errorf("consumer is nil")
}
seekMsgID, err := ms.client.BytesToMsgID(mp.MsgID)
if err != nil {
return err
}
log.Info("MsgStream begin to seek start msg: ", zap.String("channel", mp.ChannelName), zap.Any("MessageID", mp.MsgID))
err = consumer.Seek(seekMsgID, true)
if err != nil {
log.Warn("Failed to seek", zap.String("channel", mp.ChannelName), zap.Error(err))
// stop retry if consumer topic not exist
if errors.Is(err, mqwrapper.ErrTopicNotExist) {
return retry.Unrecoverable(err)
}
return err
}
log.Info("MsgStream seek finished", zap.String("channel", mp.ChannelName))
return nil
}
ms.consumerLock.Lock()
defer ms.consumerLock.Unlock()
for idx := range msgPositions {
mp = msgPositions[idx]
if len(mp.MsgID) == 0 {
return fmt.Errorf("when msgID's length equal to 0, please use AsConsumer interface")
}
err = retry.Do(context.TODO(), fn, retry.Attempts(20), retry.Sleep(time.Millisecond*200), retry.MaxSleepTime(5*time.Second))
if err != nil {
return fmt.Errorf("failed to seek, error %s", err.Error())
}
ms.addConsumer(consumer, mp.ChannelName)
ms.chanMsgPos[consumer] = (proto.Clone(mp)).(*MsgPosition)
// skip all data before current tt
runLoop := true
for runLoop {
select {
case <-ms.ctx.Done():
return ms.ctx.Err()
case msg, ok := <-consumer.Chan():
if !ok {
return fmt.Errorf("consumer closed")
}
consumer.Ack(msg)
headerMsg := commonpb.MsgHeader{}
err := proto.Unmarshal(msg.Payload(), &headerMsg)
if err != nil {
return fmt.Errorf("failed to unmarshal message header, err %s", err.Error())
}
tsMsg, err := ms.unmarshal.Unmarshal(msg.Payload(), headerMsg.Base.MsgType)
if err != nil {
return fmt.Errorf("failed to unmarshal tsMsg, err %s", err.Error())
}
if tsMsg.Type() == commonpb.MsgType_TimeTick && tsMsg.BeginTs() >= mp.Timestamp {
runLoop = false
break
} else if tsMsg.BeginTs() > mp.Timestamp {
ctx, _ := ExtractCtx(tsMsg, msg.Properties())
tsMsg.SetTraceCtx(ctx)
tsMsg.SetPosition(&MsgPosition{
ChannelName: filepath.Base(msg.Topic()),
MsgID: msg.ID().Serialize(),
})
ms.chanMsgBuf[consumer] = append(ms.chanMsgBuf[consumer], tsMsg)
}
}
}
}
return nil
}
func (ms *MqTtMsgStream) Chan() <-chan *MsgPack {
ms.onceChan.Do(func() {
if ms.consumers != nil {
go ms.bufMsgPackToChannel()
}
})
return ms.receiveBuf
}