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replication_server.go
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replication_server.go
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package storagenode
import (
"context"
"fmt"
"io"
"sync"
"go.uber.org/multierr"
"go.uber.org/zap"
"github.com/kakao/varlog/internal/storagenode/logstream"
"github.com/kakao/varlog/proto/snpb"
)
type replicationServer struct {
sn *StorageNode
logger *zap.Logger
}
var _ snpb.ReplicatorServer = (*replicationServer)(nil)
func (rs *replicationServer) Replicate(stream snpb.Replicator_ReplicateServer) error {
wg := &sync.WaitGroup{}
ctx, cancel := context.WithCancel(stream.Context())
defer func() {
cancel()
wg.Wait()
}()
errC := rs.replicate(ctx, rs.recv(ctx, stream, wg), wg)
err := <-errC
err = multierr.Append(err, stream.SendAndClose(&snpb.ReplicateResponse{}))
rs.logger.Error("closed replication stream", zap.Error(err))
return err
}
func (rs *replicationServer) SyncInit(ctx context.Context, req *snpb.SyncInitRequest) (*snpb.SyncInitResponse, error) {
lse, loaded := rs.sn.executors.Load(req.Destination.TopicID, req.Destination.LogStreamID)
if !loaded {
return nil, fmt.Errorf("replication server: no log stream %v", req.Destination.LogStreamID)
}
syncRange, err := lse.SyncInit(ctx, req.Source, req.Range, req.LastCommittedLLSN)
return &snpb.SyncInitResponse{Range: syncRange}, err
}
func (rs *replicationServer) SyncReplicate(ctx context.Context, req *snpb.SyncReplicateRequest) (*snpb.SyncReplicateResponse, error) {
lse, loaded := rs.sn.executors.Load(req.Destination.TopicID, req.Destination.LogStreamID)
if !loaded {
return nil, fmt.Errorf("replication server: no log stream %v", req.Destination.LogStreamID)
}
err := lse.SyncReplicate(ctx, req.Source, req.Payload)
return &snpb.SyncReplicateResponse{}, err
}
func (rs *replicationServer) SyncReplicateStream(stream snpb.Replicator_SyncReplicateStreamServer) error {
var err error
req := new(snpb.SyncReplicateRequest)
for {
req.Reset()
err = stream.RecvMsg(req)
if err != nil {
if err == io.EOF {
err = nil
} else {
err = fmt.Errorf("replication server: sync replicate stream: %w", err)
}
break
}
lse, loaded := rs.sn.executors.Load(req.Destination.TopicID, req.Destination.LogStreamID)
if !loaded {
err = fmt.Errorf("replication server: sync replicate stream: no log stream %v", req.Destination.LogStreamID)
break
}
err = lse.SyncReplicate(stream.Context(), req.Source, req.Payload)
if err != nil {
err = fmt.Errorf("replication server: sync replicate stream: %w", err)
break
}
}
return multierr.Append(err, stream.SendAndClose(&snpb.SyncReplicateResponse{}))
}
var replicationServerTaskPool = sync.Pool{
New: func() interface{} {
return &replicationServerTask{}
},
}
type replicationServerTask struct {
req snpb.ReplicateRequest
err error
}
func newReplicationServerTask(req snpb.ReplicateRequest, err error) *replicationServerTask {
rst := replicationServerTaskPool.Get().(*replicationServerTask)
rst.req = req
rst.err = err
return rst
}
func (rst *replicationServerTask) release() {
rst.req = snpb.ReplicateRequest{}
rst.err = nil
replicationServerTaskPool.Put(rst)
}
func (rs *replicationServer) recv(ctx context.Context, stream snpb.Replicator_ReplicateServer, wg *sync.WaitGroup) <-chan *replicationServerTask {
wg.Add(1)
// TODO: add configuration
c := make(chan *replicationServerTask, 4096)
go func() {
defer wg.Done()
defer close(c)
req := &snpb.ReplicateRequest{}
for {
req.Reset()
err := stream.RecvMsg(req)
rst := newReplicationServerTask(*req, err)
select {
case c <- rst:
if err != nil {
return
}
case <-ctx.Done():
rst.release()
return
}
}
}()
return c
}
func (rs *replicationServer) replicate(ctx context.Context, requestC <-chan *replicationServerTask, wg *sync.WaitGroup) <-chan error {
wg.Add(1)
errC := make(chan error)
go func() {
var err error
defer func() {
errC <- err
close(errC)
wg.Done()
}()
var rst *replicationServerTask
var lse *logstream.Executor
for {
select {
case <-ctx.Done():
err = ctx.Err()
return
case rst = <-requestC:
}
err = rst.err
if err != nil {
rst.release()
return
}
if lse == nil {
var loaded bool
lse, loaded = rs.sn.executors.Load(rst.req.TopicID, rst.req.LogStreamID)
if !loaded {
err = fmt.Errorf("replication server: no log stream %v", rst.req.LogStreamID)
rst.release()
return
}
}
lse.Metrics().ReplicateServerOperations.Add(1)
err = lse.Replicate(ctx, rst.req.LLSN, rst.req.Data)
if err != nil {
rst.release()
return
}
rst.release()
}
}()
return errC
}