152 lines
2.8 KiB
Go
152 lines
2.8 KiB
Go
/*
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Copyright 2014 CoreOS Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package etcdserver
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import (
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"bytes"
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"fmt"
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"log"
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"net/http"
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"sync"
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"sync/atomic"
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"time"
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)
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const (
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maxInflight = 4
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)
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const (
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participantPeer = iota
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idlePeer
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stoppedPeer
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)
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type peer struct {
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url string
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queue chan []byte
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status int
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inflight atomicInt
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c *http.Client
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followerStats *raftFollowerStats
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mu sync.RWMutex
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wg sync.WaitGroup
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}
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func newPeer(url string, c *http.Client, followerStats *raftFollowerStats) *peer {
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return &peer{
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url: url,
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status: idlePeer,
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c: c,
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followerStats: followerStats,
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}
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}
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func (p *peer) participate() {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.queue = make(chan []byte)
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p.status = participantPeer
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for i := 0; i < maxInflight; i++ {
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p.wg.Add(1)
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go p.handle(p.queue)
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}
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}
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func (p *peer) idle() {
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p.mu.Lock()
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defer p.mu.Unlock()
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if p.status == participantPeer {
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close(p.queue)
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}
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p.status = idlePeer
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}
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func (p *peer) stop() {
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p.mu.Lock()
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if p.status == participantPeer {
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close(p.queue)
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}
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p.status = stoppedPeer
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p.mu.Unlock()
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p.wg.Wait()
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}
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func (p *peer) handle(queue chan []byte) {
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defer p.wg.Done()
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for d := range queue {
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p.post(d)
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}
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}
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func (p *peer) send(d []byte) error {
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p.mu.Lock()
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defer p.mu.Unlock()
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switch p.status {
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case participantPeer:
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select {
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case p.queue <- d:
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default:
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return fmt.Errorf("reach max serving")
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}
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case idlePeer:
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if p.inflight.Get() > maxInflight {
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return fmt.Errorf("reach max idle")
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}
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p.wg.Add(1)
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go func() {
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p.post(d)
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p.wg.Done()
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}()
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case stoppedPeer:
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return fmt.Errorf("sender stopped")
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}
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return nil
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}
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func (p *peer) post(d []byte) {
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p.inflight.Add(1)
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defer p.inflight.Add(-1)
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buf := bytes.NewBuffer(d)
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start := time.Now()
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resp, err := p.c.Post(p.url, "application/octet-stream", buf)
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end := time.Now()
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// TODO: Have no way to detect RPC success or failure now
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p.followerStats.Succ(end.Sub(start))
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if err != nil {
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log.Printf("peer.post url=%s err=\"%v\"", p.url, err)
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return
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}
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resp.Body.Close()
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}
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// An AtomicInt is an int64 to be accessed atomically.
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type atomicInt int64
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func (i *atomicInt) Add(d int64) {
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atomic.AddInt64((*int64)(i), d)
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}
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func (i *atomicInt) Get() int64 {
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return atomic.LoadInt64((*int64)(i))
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}
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func (i *atomicInt) Set(n int64) {
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atomic.StoreInt64((*int64)(i), n)
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}
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