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package topic
import (
"context"
"fmt"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
"github.com/seaweedfs/seaweedfs/weed/util/log_buffer"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"sync"
"sync/atomic"
"time"
)
type LocalPartition struct {
ListenersWaits int64
AckTsNs int64
// notifying clients
ListenersLock sync.Mutex
ListenersCond *sync.Cond
Partition
LogBuffer *log_buffer.LogBuffer
Publishers *LocalPartitionPublishers
Subscribers *LocalPartitionSubscribers
publishFolloweMeStream mq_pb.SeaweedMessaging_PublishFollowMeClient
followerGrpcConnection *grpc.ClientConn
Follower string
}
var TIME_FORMAT = "2006-01-02-15-04-05"
var PartitionGenerationFormat = "v2006-01-02-15-04-05"
func NewLocalPartition(partition Partition, logFlushFn log_buffer.LogFlushFuncType, readFromDiskFn log_buffer.LogReadFromDiskFuncType) *LocalPartition {
lp := &LocalPartition{
Partition: partition,
Publishers: NewLocalPartitionPublishers(),
Subscribers: NewLocalPartitionSubscribers(),
}
lp.ListenersCond = sync.NewCond(&lp.ListenersLock)
lp.LogBuffer = log_buffer.NewLogBuffer(fmt.Sprintf("%d/%04d-%04d", partition.UnixTimeNs, partition.RangeStart, partition.RangeStop),
2*time.Minute, logFlushFn, readFromDiskFn, func() {
if atomic.LoadInt64(&lp.ListenersWaits) > 0 {
lp.ListenersCond.Broadcast()
}
})
return lp
}
func (p *LocalPartition) Publish(message *mq_pb.DataMessage) error {
p.LogBuffer.AddToBuffer(message)
// maybe send to the follower
if p.publishFolloweMeStream != nil {
// println("recv", string(message.Key), message.TsNs)
if followErr := p.publishFolloweMeStream.Send(&mq_pb.PublishFollowMeRequest{
Message: &mq_pb.PublishFollowMeRequest_Data{
Data: message,
},
}); followErr != nil {
return fmt.Errorf("send to follower %s: %v", p.Follower, followErr)
}
} else {
atomic.StoreInt64(&p.AckTsNs, message.TsNs)
}
return nil
}
func (p *LocalPartition) Subscribe(clientName string, startPosition log_buffer.MessagePosition,
onNoMessageFn func() bool, eachMessageFn log_buffer.EachLogEntryFuncType) error {
var processedPosition log_buffer.MessagePosition
var readPersistedLogErr error
var readInMemoryLogErr error
var isDone bool
for {
processedPosition, isDone, readPersistedLogErr = p.LogBuffer.ReadFromDiskFn(startPosition, 0, eachMessageFn)
if readPersistedLogErr != nil {
glog.V(0).Infof("%s read %v persisted log: %v", clientName, p.Partition, readPersistedLogErr)
return readPersistedLogErr
}
if isDone {
return nil
}
if processedPosition.Time.UnixNano() != 0 {
startPosition = processedPosition
}
processedPosition, isDone, readInMemoryLogErr = p.LogBuffer.LoopProcessLogData(clientName, startPosition, 0, onNoMessageFn, eachMessageFn)
if isDone {
return nil
}
if processedPosition.Time.UnixNano() != 0 {
startPosition = processedPosition
}
if readInMemoryLogErr == log_buffer.ResumeFromDiskError {
continue
}
if readInMemoryLogErr != nil {
glog.V(0).Infof("%s read %v in memory log: %v", clientName, p.Partition, readInMemoryLogErr)
return readInMemoryLogErr
}
}
}
func (p *LocalPartition) GetEarliestMessageTimeInMemory() time.Time {
return p.LogBuffer.GetEarliestTime()
}
func (p *LocalPartition) HasData() bool {
return !p.LogBuffer.GetEarliestTime().IsZero()
}
func (p *LocalPartition) GetEarliestInMemoryMessagePosition() log_buffer.MessagePosition {
return p.LogBuffer.GetEarliestPosition()
}
func (p *LocalPartition) closePublishers() {
p.Publishers.SignalShutdown()
}
func (p *LocalPartition) closeSubscribers() {
p.Subscribers.SignalShutdown()
}
func (p *LocalPartition) WaitUntilNoPublishers() {
for {
if p.Publishers.Size() == 0 {
return
}
time.Sleep(113 * time.Millisecond)
}
}
func (p *LocalPartition) MaybeConnectToFollowers(initMessage *mq_pb.PublishMessageRequest_InitMessage, grpcDialOption grpc.DialOption) (err error) {
if p.publishFolloweMeStream != nil {
return nil
}
if initMessage.FollowerBroker == "" {
return nil
}
p.Follower = initMessage.FollowerBroker
ctx := context.Background()
p.followerGrpcConnection, err = pb.GrpcDial(ctx, p.Follower, true, grpcDialOption)
if err != nil {
return fmt.Errorf("fail to dial %s: %v", p.Follower, err)
}
followerClient := mq_pb.NewSeaweedMessagingClient(p.followerGrpcConnection)
p.publishFolloweMeStream, err = followerClient.PublishFollowMe(ctx)
if err != nil {
return fmt.Errorf("fail to create publish client: %v", err)
}
if err = p.publishFolloweMeStream.Send(&mq_pb.PublishFollowMeRequest{
Message: &mq_pb.PublishFollowMeRequest_Init{
Init: &mq_pb.PublishFollowMeRequest_InitMessage{
Topic: initMessage.Topic,
Partition: initMessage.Partition,
},
},
}); err != nil {
return err
}
// start receiving ack from follower
go func() {
defer func() {
// println("stop receiving ack from follower")
}()
for {
ack, err := p.publishFolloweMeStream.Recv()
if err != nil {
e, _ := status.FromError(err)
if e.Code() == codes.Canceled {
glog.V(0).Infof("local partition %v follower %v stopped", p.Partition, p.Follower)
return
}
glog.Errorf("Receiving local partition %v follower %s ack: %v", p.Partition, p.Follower, err)
return
}
atomic.StoreInt64(&p.AckTsNs, ack.AckTsNs)
// println("recv ack", ack.AckTsNs)
}
}()
return nil
}
func (p *LocalPartition) MaybeShutdownLocalPartition() (hasShutdown bool) {
if p.Publishers.Size() == 0 && p.Subscribers.Size() == 0 {
p.LogBuffer.ShutdownLogBuffer()
for !p.LogBuffer.IsAllFlushed() {
time.Sleep(113 * time.Millisecond)
}
if p.publishFolloweMeStream != nil {
// send close to the follower
if followErr := p.publishFolloweMeStream.Send(&mq_pb.PublishFollowMeRequest{
Message: &mq_pb.PublishFollowMeRequest_Close{
Close: &mq_pb.PublishFollowMeRequest_CloseMessage{},
},
}); followErr != nil {
glog.Errorf("Error closing follower stream: %v", followErr)
}
glog.V(4).Infof("closing grpcConnection to follower")
p.followerGrpcConnection.Close()
p.publishFolloweMeStream = nil
p.Follower = ""
}
hasShutdown = true
}
glog.V(0).Infof("local partition %v Publisher:%d Subscriber:%d follower:%s shutdown %v", p.Partition, p.Publishers.Size(), p.Subscribers.Size(), p.Follower, hasShutdown)
return
}
func (p *LocalPartition) Shutdown() {
p.closePublishers()
p.closeSubscribers()
p.LogBuffer.ShutdownLogBuffer()
glog.V(0).Infof("local partition %v shutting down", p.Partition)
}
func (p *LocalPartition) NotifyLogFlushed(flushTsNs int64) {
if p.publishFolloweMeStream != nil {
if followErr := p.publishFolloweMeStream.Send(&mq_pb.PublishFollowMeRequest{
Message: &mq_pb.PublishFollowMeRequest_Flush{
Flush: &mq_pb.PublishFollowMeRequest_FlushMessage{
TsNs: flushTsNs,
},
},
}); followErr != nil {
glog.Errorf("send follower %s flush message: %v", p.Follower, followErr)
}
// println("notifying", p.Follower, "flushed at", flushTsNs)
}
}
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