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regdiscv.go
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regdiscv.go
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package rd
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"strings"
"sync"
"time"
"github.com/TencentBlueKing/bk-turbo/src/backend/booster/common/blog"
"github.com/TencentBlueKing/bk-turbo/src/backend/booster/common/codec"
"github.com/TencentBlueKing/bk-turbo/src/backend/booster/common/ssl"
"github.com/TencentBlueKing/bk-turbo/src/backend/booster/server/pkg/engine/distcc/controller/config"
"github.com/TencentBlueKing/bk-turbo/src/backend/booster/server/pkg/engine/distcc/controller/pkg/types"
etcdClient "github.com/coreos/etcd/clientv3"
etcdConcurrency "github.com/coreos/etcd/clientv3/concurrency"
)
// RegisterDiscover takes responsibility to register and elect a
// master, also watching the clusters change to notify the RoleChangeEvent.
type RegisterDiscover interface {
Quit() error
Register() (types.RoleChangeEvent, error)
IsMaster() (bool, *types.DistCCControllerInfo, error)
GetServers() ([]*types.DistCCControllerInfo, error)
}
// NewRegisterDiscover get a new register-discover
func NewRegisterDiscover(conf *config.DistCCControllerConfig) (RegisterDiscover, error) {
addr := strings.Split(conf.EtcdEndpoints, ",")
blog.Infof("get new register-discover with addr: %v", addr)
var tlsConf *tls.Config
var err error
if len(conf.EtcdCaFile) != 0 && len(conf.EtcdCertFile) != 0 && len(conf.EtcdKeyFile) != 0 {
tlsConf, err = ssl.ClientTSLConfVerity(conf.EtcdCaFile, conf.EtcdCertFile, conf.EtcdKeyFile, conf.EtcdKeyPwd)
if err != nil {
blog.Errorf("generate etcd tls failed: %v", err)
return nil, err
}
}
client, err := etcdClient.New(etcdClient.Config{
Endpoints: addr,
DialTimeout: 5 * time.Second,
TLS: tlsConf,
})
if err != nil {
blog.Errorf("fail to connect to etcd. err: %v", err)
return nil, err
}
rootPath := strings.TrimSuffix(conf.EtcdRootPath, "/")
if rootPath == "" {
return nil, fmt.Errorf("etcd root path is not allowed to be top")
}
electionPath := rootPath + "/" + types.DistCCControllerElectionPath
return &etcdRegisterDiscover{conf: conf, client: client, electionPath: electionPath}, nil
}
type etcdRegisterDiscover struct {
conf *config.DistCCControllerConfig
client *etcdClient.Client
session *etcdConcurrency.Session
election *etcdConcurrency.Election
electionPath string
event chan types.RoleType
role types.RoleType
roleMutex sync.RWMutex
serverInfo []byte
leader *types.DistCCControllerInfo
leaderUpdated bool
leaderMutex sync.RWMutex
servers []*types.DistCCControllerInfo
serverUpdated bool
serverMutex sync.RWMutex
}
// Quit stop the connections to etcd
func (erd *etcdRegisterDiscover) Quit() error {
if erd.session != nil {
return erd.session.Close()
}
blog.Infof("session already quit")
return nil
}
// Register register and get the role change event to watch the role
func (erd *etcdRegisterDiscover) Register() (types.RoleChangeEvent, error) {
blog.Infof("register etcd for election")
// register server info to etcd
if err := erd.generateServerInfo(); err != nil {
blog.Errorf("register server info failed: %v", err)
return nil, err
}
// before election, the role should be slave
erd.event = make(chan types.RoleType, 1)
erd.setRole(types.DistCCControllerSlave)
go erd.elect()
go erd.watch()
return erd.event, nil
}
// IsMaster check whether I am the master
func (erd *etcdRegisterDiscover) IsMaster() (isMaster bool, info *types.DistCCControllerInfo, err error) {
erd.roleMutex.RLock()
role := erd.role
erd.roleMutex.RUnlock()
erd.leaderMutex.RLock()
leader := erd.leader
if role == types.DistCCControllerMaster {
erd.leaderMutex.RUnlock()
return true, leader, nil
}
defer func() {
if leader.IP == erd.conf.LocalIP && leader.Port == erd.conf.Port {
err = fmt.Errorf("server is no ready")
}
}()
if erd.leaderUpdated {
erd.leaderMutex.RUnlock()
return false, leader, nil
}
erd.leaderMutex.RUnlock()
leader, err = erd.updateLeader()
if err != nil {
return false, nil, err
}
return false, leader, nil
}
// GetServers get all servers registered in etcd
func (erd *etcdRegisterDiscover) GetServers() ([]*types.DistCCControllerInfo, error) {
erd.serverMutex.RLock()
servers := erd.servers
if erd.serverUpdated {
erd.serverMutex.RUnlock()
return servers, nil
}
erd.serverMutex.RUnlock()
servers, err := erd.updateServers()
if err != nil {
return nil, err
}
return servers, nil
}
func (erd *etcdRegisterDiscover) connect() {
done := make(chan struct{}, 1)
go erd.doConnect(done)
select {
case <-done:
return
}
}
func (erd *etcdRegisterDiscover) doConnect(done chan struct{}) {
blog.Infof("try to build a new session with etcd")
session, err := etcdConcurrency.NewSession(erd.client, etcdConcurrency.WithTTL(5))
if erd.session != nil {
_ = erd.session.Close()
}
erd.session = session
if err != nil {
blog.Errorf("build etcd session failed: %v, will retry in 5 seconds", err)
time.Sleep(5 * time.Second)
go erd.doConnect(done)
return
}
erd.election = etcdConcurrency.NewElection(session, erd.electionPath)
blog.Infof("build etcd session successfully")
done <- struct{}{}
}
func (erd *etcdRegisterDiscover) updateLeader() (*types.DistCCControllerInfo, error) {
erd.leaderMutex.Lock()
defer erd.leaderMutex.Unlock()
resp, err := erd.election.Leader(context.TODO())
if err != nil {
blog.Errorf("get current leader failed: %v", err)
return nil, err
}
if len(resp.Kvs) == 0 {
blog.Errorf("get current leader failed: returned data is empty")
return nil, fmt.Errorf("leader data is empty")
}
erd.leader = new(types.DistCCControllerInfo)
if err := codec.DecJSON(resp.Kvs[0].Value, erd.leader); err != nil {
blog.Errorf("decode leader data failed: %v", err)
return nil, err
}
blog.Infof("success to update leader: %s", string(resp.Kvs[0].Value))
erd.leaderUpdated = true
return erd.leader, nil
}
func (erd *etcdRegisterDiscover) updateServers() ([]*types.DistCCControllerInfo, error) {
erd.serverMutex.Lock()
defer erd.serverMutex.Unlock()
erd.servers = make([]*types.DistCCControllerInfo, 0, 10)
resp, err := erd.client.Get(context.TODO(), erd.electionPath+"/", etcdClient.WithPrefix())
if err != nil {
blog.Errorf("get current servers failed: %v", err)
return nil, err
}
for _, kv := range resp.Kvs {
var server types.DistCCControllerInfo
if err := codec.DecJSON(kv.Value, &server); err != nil {
blog.Errorf("decode server data failed: %v", err)
return nil, err
}
erd.servers = append(erd.servers, &server)
}
erd.serverUpdated = true
return erd.servers, nil
}
func (erd *etcdRegisterDiscover) watch() {
blog.Infof("begin to watch election path: %s", erd.electionPath)
watchChan := erd.client.Watch(context.TODO(), erd.electionPath+"/", etcdClient.WithPrefix())
for {
select {
case <-watchChan:
blog.Infof("registered services changed, leader & server will be both set no-updated")
erd.leaderMutex.Lock()
erd.leaderUpdated = false
erd.leaderMutex.Unlock()
erd.serverMutex.Lock()
erd.serverUpdated = false
erd.serverMutex.Unlock()
}
}
}
func (erd *etcdRegisterDiscover) elect() {
erd.connect()
blog.Infof("prepare to elect leader in etcd with server info: %s", erd.serverInfo)
err := erd.election.Campaign(context.TODO(), string(erd.serverInfo))
if err != nil {
blog.Errorf("elect campaign failed: %v, will retry in 5 seconds", err)
time.Sleep(5 * time.Second)
go erd.elect()
return
}
blog.Infof("elect as a master")
erd.setRole(types.DistCCControllerMaster)
select {
case <-erd.session.Done():
blog.Errorf("elect: etcd session expired")
erd.event <- types.DistCCControllerUnknown
}
go erd.elect()
}
func (erd *etcdRegisterDiscover) setRole(role types.RoleType) {
erd.roleMutex.Lock()
defer erd.roleMutex.Unlock()
erd.role = role
erd.event <- role
}
func (erd *etcdRegisterDiscover) generateServerInfo() error {
serverInfo := new(types.DistCCControllerInfo)
serverInfo.IP = erd.conf.LocalIP
serverInfo.Port = erd.conf.Port
serverInfo.Scheme = "http"
if erd.conf.ServerCert.IsSSL {
serverInfo.Scheme = "https"
}
data, err := json.Marshal(serverInfo)
if err != nil {
blog.Errorf("fail to marshal server info to json. err: %v", err)
return err
}
erd.serverInfo = data
return nil
}