/
discover.go
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/
discover.go
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/*
* Tencent is pleased to support the open source community by making 蓝鲸 available.
* Copyright (C) 2017-2018 THL A29 Limited, a Tencent company. All rights reserved.
* Licensed under the MIT License (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
* http://opensource.org/licenses/MIT
* 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 datacollection
import (
"context"
"io"
"net/http"
"runtime"
"runtime/debug"
"sync"
"sync/atomic"
"time"
"github.com/rs/xid"
"gopkg.in/redis.v5"
bkc "configcenter/src/common"
"configcenter/src/common/backbone"
"configcenter/src/common/blog"
httpcli "configcenter/src/common/http/httpclient"
)
type Discover struct {
sync.Mutex
redisCli *redis.Client
subCli *redis.Client
id string
chanName string
ts time.Time
msgChan chan string
interrupt chan error
doneCh chan struct{}
resetHandle chan struct{}
isMaster bool
isSubing bool
maxConcurrent int
maxSize int
getMasterInterval time.Duration
masterProcLockLiveTime time.Duration
requests *httpcli.HttpClient
*backbone.Engine
ctx context.Context
pheader http.Header
}
var msgHandlerCnt = int64(0)
func NewDiscover(ctx context.Context, chanName string, maxSize int, redisCli, subCli *redis.Client, backbone *backbone.Engine) *Discover {
if 0 == maxSize {
maxSize = 100
}
pheader := http.Header{}
pheader.Add(bkc.BKHTTPOwnerID, bkc.BKDefaultOwnerID)
pheader.Add(bkc.BKHTTPHeaderUser, bkc.CCSystemCollectorUserName)
discover := &Discover{
chanName: chanName,
msgChan: make(chan string, maxSize*4),
interrupt: make(chan error),
resetHandle: make(chan struct{}),
doneCh: make(chan struct{}),
maxSize: maxSize,
redisCli: redisCli,
subCli: subCli,
ts: time.Now(),
id: xid.New().String()[5:],
maxConcurrent: runtime.NumCPU(),
getMasterInterval: time.Second * 11,
masterProcLockLiveTime: getMasterProcIntervalTime + time.Second*10,
ctx: ctx,
pheader: pheader,
}
discover.Engine = backbone
return discover
}
func (d *Discover) Start() {
go func() {
d.Run()
for {
time.Sleep(10 * time.Second)
NewDiscover(d.ctx, d.chanName, d.maxSize, d.redisCli, d.subCli, d.Engine).Run()
}
}()
}
func (d *Discover) Run() {
defer func() {
if err := recover(); err != nil {
blog.Errorf("fatal error happened: %s, we will try again 10s later, stack: \n%s", err, debug.Stack())
}
close(d.doneCh)
d.isMaster = false
return
}()
blog.Infof("discover start with maxConcurrent: %d", d.maxConcurrent)
ticker := time.NewTicker(d.getMasterInterval)
var err error
var msg string
var msgs []string
var addCount, delayHandleCnt int
if d.lockMaster() {
blog.Infof("lock master success, start subscribe channel: %s", d.chanName)
go d.subChan()
} else {
blog.Infof("master process exists, recheck after %v ", d.getMasterInterval)
}
for {
select {
case <-ticker.C:
if d.lockMaster() {
if !d.isSubing {
blog.Infof("try to subscribe channel: %s", d.chanName)
go d.subChan()
}
}
case msg = <-d.msgChan:
d.Lock()
msgs = make([]string, 0, d.maxSize*2)
msgs = append(msgs, msg)
addCount = 0
d.ts = time.Now()
RLoop:
for {
select {
case <-time.After(time.Second):
break RLoop
case msg = <-d.msgChan:
blog.Infof("continue read 1s from channel: %d", addCount)
addCount++
msgs = append(msgs, msg)
if addCount > d.maxSize {
break RLoop
}
}
}
d.Unlock()
delayHandleCnt = 0
for {
if delayHandleCnt > d.maxConcurrent*2 {
blog.Warnf("msg process delay %d times, reset handlers", delayHandleCnt)
close(d.resetHandle)
d.resetHandle = make(chan struct{})
delayHandleCnt = 0
}
if atomic.LoadInt64(&msgHandlerCnt) < int64(d.maxConcurrent) {
atomic.AddInt64(&msgHandlerCnt, 1)
blog.Infof("start message handler: %d", msgHandlerCnt)
go d.handleMsg(msgs, d.resetHandle)
break
}
delayHandleCnt++
blog.Warnf("msg process delay again(%d times)", delayHandleCnt)
time.Sleep(time.Millisecond * 100)
}
case err = <-d.interrupt:
blog.Warnf("release master, msg process interrupted by: %s", err.Error())
d.releaseMaster()
}
}
}
func (d *Discover) subChan() {
defer func() {
if err := recover(); err != nil {
blog.Errorf("subChan fatal error happened %s, we will try again 10s later, stack: \n%s", err, debug.Stack())
}
d.isSubing = false
}()
d.isSubing = true
subChan, err := d.subCli.Subscribe(d.chanName)
if nil != err {
d.interrupt <- err
blog.Errorf("subscribe [%s] failed: %s", d.chanName, err.Error())
}
defer func() {
subChan.Unsubscribe(d.chanName)
d.isSubing = false
blog.Infof("close subscribe channel: %s", d.chanName)
}()
var ts = time.Now()
var cnt int64
blog.Infof("start subscribe channel %s", d.chanName)
for {
if !d.isMaster {
blog.Infof("i am not master, stop subscribe")
return
}
received, err := subChan.Receive()
if nil != err {
if err == redis.Nil || err == io.EOF {
continue
}
blog.Warnf("receive message err: %s", err.Error())
d.interrupt <- err
continue
}
msg, ok := received.(*redis.Message)
if !ok || "" == msg.Payload {
blog.Warnf("receive message failed(%v) or empty!", ok)
continue
}
chanLen := len(d.msgChan)
if d.maxSize*2 <= chanLen {
blog.Infof("msgChan full, maxsize: %d, current: %d", d.maxSize, chanLen)
d.clearOldMsg()
}
d.msgChan <- msg.Payload
cnt++
blog.Infof("send %d message to discover channel", cnt)
if cnt%10000 == 0 {
blog.Infof("receive rate: %d/sec", int(float64(cnt)/time.Now().Sub(ts).Seconds()))
cnt = 0
ts = time.Now()
}
}
}
func (d *Discover) clearOldMsg() {
ts := d.ts
msgCnt := len(d.msgChan) - d.maxSize
blog.Warnf("start msgChan clear: %d", msgCnt)
var cnt int
for cnt < msgCnt {
d.Lock()
cnt++
if ts != d.ts {
msgCnt = len(d.msgChan) - d.maxSize
} else {
select {
case <-time.After(time.Second * 10):
case <-d.msgChan:
}
}
d.Unlock()
}
if ts == d.ts {
close(d.resetHandle)
}
blog.Warnf("msgChan cleared: %d", cnt)
}
func (d *Discover) releaseMaster() {
val := d.redisCli.Get(MasterDisLockKey).Val()
if val != d.id {
d.redisCli.Del(MasterDisLockKey)
}
d.isMaster, d.isSubing = false, false
}
func (d *Discover) lockMaster() (ok bool) {
var err error
if d.isMaster {
var val string
val, err = d.redisCli.Get(MasterDisLockKey).Result()
if err != nil {
d.isMaster = false
blog.Errorf("discover-master: lock master err %v", err)
} else if val == d.id {
blog.Infof("discover-master check : i am still master")
d.redisCli.Set(MasterDisLockKey, d.id, d.masterProcLockLiveTime)
ok = true
d.isMaster = true
} else {
blog.Infof("discover-master: exit, val = %v, id = %v", val, d.id)
d.isMaster = false
ok = false
}
} else {
ok, err = d.redisCli.SetNX(MasterDisLockKey, d.id, d.masterProcLockLiveTime).Result()
if err != nil {
d.isMaster = false
blog.Errorf("discover-slave: lock master err %v", err)
} else if ok {
blog.Infof("discover-slave: check ok, i am master from now")
d.isMaster = true
} else {
d.isMaster = false
blog.Infof("discover-slave: check failed, there is other master process exists, recheck after %v ", d.getMasterInterval)
}
}
return ok
}
func (d *Discover) handleMsg(msgs []string, resetHandle chan struct{}) error {
defer atomic.AddInt64(&msgHandlerCnt, -1)
blog.Infof("discover-master: handle %d num message, routines %d", len(msgs), atomic.LoadInt64(&msgHandlerCnt))
for index, msg := range msgs {
if msg == "" {
continue
}
select {
case <-resetHandle:
blog.Warnf("reset handler, handled %d, set maxSize to %d ", index, d.maxSize)
return nil
case <-d.doneCh:
blog.Warnf("close handler, handled %d")
return nil
default:
err := d.TryCreateModel(msg)
if err != nil {
blog.Errorf("create model err: %s"+
"##msg[%s]msg##", err, msg)
continue
}
err = d.UpdateOrAppendAttrs(msg)
if err != nil {
blog.Errorf("create attr err: %s"+
"##msg[%s]msg##", err, msg)
continue
}
err = d.UpdateOrCreateInst(msg)
if err != nil {
blog.Errorf("create inst err: %s"+
"##msg[%s]msg##", err, msg)
continue
}
blog.Infof("==============[%d/%d] discover message finished", index, len(msgs))
}
}
return nil
}