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sender.go
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sender.go
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/*
Copyright 2014 CoreOS, Inc.
Licensed 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 rafthttp
import (
"bytes"
"fmt"
"log"
"net/http"
"sync"
"time"
"github.com/coreos/etcd/etcdserver/stats"
"github.com/coreos/etcd/pkg/pbutil"
"github.com/coreos/etcd/pkg/types"
"github.com/coreos/etcd/raft/raftpb"
)
const (
connPerSender = 4
senderBufSize = connPerSender * 4
appRespBatchMs = 50
ConnReadTimeout = 5 * time.Second
ConnWriteTimeout = 5 * time.Second
)
type Sender interface {
// StartStreaming enables streaming in the sender using the given writer,
// which provides a fast and effecient way to send appendEntry messages.
StartStreaming(w WriteFlusher, to types.ID, term uint64) (done <-chan struct{}, err error)
Update(u string)
// Send sends the data to the remote node. It is always non-blocking.
// It may be fail to send data if it returns nil error.
Send(m raftpb.Message) error
// Stop performs any necessary finalization and terminates the Sender
// elegantly.
Stop()
}
func NewSender(tr http.RoundTripper, u string, cid types.ID, p Processor, fs *stats.FollowerStats, shouldstop chan struct{}) *sender {
s := &sender{
tr: tr,
u: u,
cid: cid,
p: p,
fs: fs,
shouldstop: shouldstop,
batcher: NewBatcher(100, appRespBatchMs*time.Millisecond),
q: make(chan []byte, senderBufSize),
}
s.wg.Add(connPerSender)
for i := 0; i < connPerSender; i++ {
go s.handle()
}
return s
}
type sender struct {
tr http.RoundTripper
u string
cid types.ID
p Processor
fs *stats.FollowerStats
shouldstop chan struct{}
strmCln *streamClient
batcher *Batcher
strmSrv *streamServer
strmSrvMu sync.Mutex
q chan []byte
mu sync.RWMutex
wg sync.WaitGroup
}
func (s *sender) StartStreaming(w WriteFlusher, to types.ID, term uint64) (<-chan struct{}, error) {
s.strmSrvMu.Lock()
defer s.strmSrvMu.Unlock()
if s.strmSrv != nil {
// ignore lower-term streaming request
if term < s.strmSrv.term {
return nil, fmt.Errorf("out of data streaming request: term %d, request term %d", term, s.strmSrv.term)
}
// stop the existing one
s.strmSrv.stop()
}
s.strmSrv = startStreamServer(w, to, term, s.fs)
return s.strmSrv.stopNotify(), nil
}
func (s *sender) Update(u string) {
s.mu.Lock()
defer s.mu.Unlock()
s.u = u
}
// TODO (xiangli): reasonable retry logic
func (s *sender) Send(m raftpb.Message) error {
s.maybeStopStream(m.Term)
if shouldInitStream(m) && !s.hasStreamClient() {
s.initStream(types.ID(m.From), types.ID(m.To), m.Term)
s.batcher.Reset(time.Now())
}
if canBatch(m) && s.hasStreamClient() {
if s.batcher.ShouldBatch(time.Now()) {
return nil
}
}
if canUseStream(m) {
if ok := s.tryStream(m); ok {
return nil
}
}
// TODO: don't block. we should be able to have 1000s
// of messages out at a time.
data := pbutil.MustMarshal(&m)
select {
case s.q <- data:
return nil
default:
log.Printf("sender: reach the maximal serving to %s", s.u)
return fmt.Errorf("reach maximal serving")
}
}
func (s *sender) Stop() {
close(s.q)
s.wg.Wait()
s.strmSrvMu.Lock()
if s.strmSrv != nil {
s.strmSrv.stop()
}
s.strmSrvMu.Unlock()
if s.strmCln != nil {
s.strmCln.stop()
}
}
func (s *sender) maybeStopStream(term uint64) {
if s.strmCln != nil && term > s.strmCln.term {
s.strmCln.stop()
s.strmCln = nil
}
s.strmSrvMu.Lock()
defer s.strmSrvMu.Unlock()
if s.strmSrv != nil && term > s.strmSrv.term {
s.strmSrv.stop()
s.strmSrv = nil
}
}
func (s *sender) hasStreamClient() bool {
return s.strmCln != nil && !s.strmCln.isStopped()
}
func (s *sender) initStream(from, to types.ID, term uint64) {
strmCln := newStreamClient(from, to, term, s.p)
s.mu.Lock()
u := s.u
s.mu.Unlock()
if err := strmCln.start(s.tr, u, s.cid); err != nil {
log.Printf("rafthttp: start stream client error: %v", err)
return
}
s.strmCln = strmCln
}
func (s *sender) tryStream(m raftpb.Message) bool {
s.strmSrvMu.Lock()
defer s.strmSrvMu.Unlock()
if s.strmSrv == nil || m.Term != s.strmSrv.term {
return false
}
if err := s.strmSrv.send(m.Entries); err != nil {
log.Printf("rafthttp: send stream message error: %v", err)
s.strmSrv.stop()
s.strmSrv = nil
return false
}
return true
}
func (s *sender) handle() {
defer s.wg.Done()
for d := range s.q {
start := time.Now()
err := s.post(d)
end := time.Now()
if err != nil {
s.fs.Fail()
log.Printf("sender: %v", err)
continue
}
s.fs.Succ(end.Sub(start))
}
}
// post POSTs a data payload to a url. Returns nil if the POST succeeds,
// error on any failure.
func (s *sender) post(data []byte) error {
s.mu.RLock()
req, err := http.NewRequest("POST", s.u, bytes.NewBuffer(data))
s.mu.RUnlock()
if err != nil {
return fmt.Errorf("new request to %s error: %v", s.u, err)
}
req.Header.Set("Content-Type", "application/protobuf")
req.Header.Set("X-Etcd-Cluster-ID", s.cid.String())
resp, err := s.tr.RoundTrip(req)
if err != nil {
return fmt.Errorf("error posting to %q: %v", req.URL.String(), err)
}
resp.Body.Close()
switch resp.StatusCode {
case http.StatusPreconditionFailed:
select {
case s.shouldstop <- struct{}{}:
default:
}
log.Printf("etcdserver: conflicting cluster ID with the target cluster (%s != %s)", resp.Header.Get("X-Etcd-Cluster-ID"), s.cid)
return nil
case http.StatusForbidden:
select {
case s.shouldstop <- struct{}{}:
default:
}
log.Println("etcdserver: this member has been permanently removed from the cluster")
log.Println("etcdserver: the data-dir used by this member must be removed so that this host can be re-added with a new member ID")
return nil
case http.StatusNoContent:
return nil
default:
return fmt.Errorf("unhandled status %s", http.StatusText(resp.StatusCode))
}
}