/
register.go
183 lines (168 loc) · 3.73 KB
/
register.go
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package register
import (
"context"
"encoding/json"
"sync"
"time"
"go.etcd.io/etcd/api/v3/v3rpc/rpctypes"
"github.com/jin06/binlogo/pkg/etcdclient"
"github.com/sirupsen/logrus"
clientv3 "go.etcd.io/etcd/client/v3"
)
// New returns a new *Register
func New(opts ...Option) (r *Register) {
r = &Register{
ttl: 5,
stopped: make(chan struct{}),
}
//r.client = etcdclient.Default()
for _, v := range opts {
v(r)
}
return
}
// Register Encapsulation of etcd register
type Register struct {
lease clientv3.Lease
leaseID clientv3.LeaseID
ttl int64
client *clientv3.Client
registerKey string
registerData interface{}
registerCreateRevision int64
stopped chan struct{}
closeOnce sync.Once
}
func (r *Register) init() (err error) {
logrus.Info("init register")
if r.client, err = etcdclient.New(); err != nil {
return
}
return
}
// Run start register
func (r *Register) Run(ctx context.Context) (err error) {
logrus.WithField("key", r.registerKey).Info("register run")
defer func() {
if re := recover(); re != nil {
logrus.Errorln("register panic, ", re)
}
if err != nil {
logrus.WithField("err", err.Error()).Infoln("register process quit unexpectedly")
}
logrus.WithField("key", r.registerKey).Info("register stopped")
r.close()
}()
if err = r.init(); err != nil {
return
}
stx, cancel := context.WithCancel(ctx)
defer cancel()
if err = r.reg(stx); err != nil {
logrus.Errorln(err)
return
}
defer func() {
errR := r.revoke(stx)
if errR != nil {
logrus.Errorln(errR)
}
logrus.Errorln("Register end: ", r.registerKey)
}()
keepTicker := time.NewTicker(time.Second)
defer keepTicker.Stop()
watchTicker := time.NewTicker(time.Second * 5)
defer watchTicker.Stop()
for {
select {
case <-ctx.Done():
{
return
}
case <-watchTicker.C:
{
wOk, wErr := r.watch(stx)
if wErr != nil {
logrus.Errorln(wErr)
return
}
if !wOk {
return
}
}
case <-keepTicker.C:
{
err = r.keepOnce(stx)
if err == rpctypes.ErrLeaseNotFound {
return
}
}
}
}
}
func (r *Register) reg(ctx context.Context) (err error) {
//r.client, _ = etcdclient.New()
r.lease = clientv3.NewLease(r.client)
rep, err := r.lease.Grant(ctx, r.ttl)
if err != nil {
return
}
r.leaseID = rep.ID
//err = dao_register.Reg(r.registerKey, r.registerData, r.leaseID)
b, err := json.Marshal(r.registerData)
if err != nil {
return
}
txn := r.client.Txn(ctx).
If(clientv3.Compare(clientv3.CreateRevision(r.registerKey), "=", int64(0))).
Then(clientv3.OpPut(r.registerKey, string(b), clientv3.WithLease(r.leaseID)))
res, err := txn.Commit()
if err != nil {
return
}
if res != nil {
r.registerCreateRevision = res.Header.Revision
}
return
}
func (r *Register) keepOnce(ctx context.Context) (err error) {
_, err = r.lease.KeepAliveOnce(ctx, r.leaseID)
if err != nil {
return
}
//logrus.Debugf("Node lease %v seconds.", resp.TTL)
return
}
func (r *Register) revoke(ctx context.Context) (err error) {
_, err = r.client.Revoke(ctx, r.leaseID)
return
}
func (r *Register) watch(ctx context.Context) (ok bool, err error) {
var res *clientv3.GetResponse
res, err = r.client.Get(ctx, r.registerKey)
if err != nil {
//logrus.Errorln(err)
return
}
if len(res.Kvs) == 0 {
return
}
if res.Kvs[0].CreateRevision == r.registerCreateRevision {
ok = true
}
//logrus.Debug(res.Kvs[0].CreateRevision)
// logrus.Debug(r.registerCreateRevision)
return
}
func (r *Register) close() error {
r.closeOnce.Do(func() {
if r.client != nil {
r.client.Close()
}
close(r.stopped)
})
return nil
}
func (r *Register) Stopped() chan struct{} {
return r.stopped
}