etcd.go
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package etcd
import (
"context"
"fmt"
clientv3 "go.etcd.io/etcd/client/v3"
"pro2d/common"
"pro2d/common/logger"
"time"
)
type EtcdClient struct {
etcd *clientv3.Client
lease clientv3.Lease
}
var GlobalEtcd *EtcdClient
func NewEtcdClient(conf *common.Etcd) error {
cli, err := clientv3.New(clientv3.Config{
Endpoints: conf.Endpoints,
DialTimeout: time.Duration(conf.DialTimeout) * time.Second,
})
if err != nil {
logger.Error("etcd init err: %v", err)
return err
}
GlobalEtcd = &EtcdClient{
etcd: cli,
lease: clientv3.NewLease(cli),
}
return nil
}
func GEtcdClient() *EtcdClient {
return GlobalEtcd
}
func (e *EtcdClient) PutWithPrefix(prefix, key, val string) {
_, err := e.etcd.Put(context.TODO(), fmt.Sprintf("/%s/%s/", prefix, key), val)
if err != nil {
logger.Error("PutWithPrefix err: %v", err)
return
}
}
func (e *EtcdClient) leaseKey(prefix, key, val string, ttl int64) (clientv3.LeaseID, error) {
leaseResp, err := e.lease.Grant(context.TODO(), ttl)
if err != nil {
logger.Error("PutWithLeasePrefix leaseKey fail:%v\n", err)
return 0, err
}
_, err = e.etcd.Put(context.TODO(), fmt.Sprintf("/%s/%s/", prefix, key), val, clientv3.WithLease(leaseResp.ID))
if err != nil {
logger.Error("PutWithLeasePrefix err: %v", err)
return 0, err
}
logger.Debug("lease key successful。。。")
return leaseResp.ID, nil
}
func (e *EtcdClient) PutWithLeasePrefix(prefix, key, val string, ttl int64) error {
logger.Debug("etcd register...")
leaseID, err := e.leaseKey(prefix, key, val, ttl)
if err != nil {
logger.Error(err)
panic(err)
}
go func() {
for {
if leaseID == 0 {
leaseID, err = e.leaseKey(prefix, key, val, ttl)
if err != nil {
logger.Error("leaseKey err: %v", err)
continue
}
}
keepRespChan, err := e.lease.KeepAlive(context.TODO(), leaseID)
if err != nil {
logger.Error("keepalive err: %v", err)
continue
}
EXIT:
for {
select {
case keepChan := <-keepRespChan:
if keepChan == nil {
logger.Debug("lease expire")
leaseID = 0
break EXIT
} else {
//每秒会续租一次，所以就会受到一次应答
//fmt.Println("收到自动续租应答:", keepResp.ID)
}
}
}
logger.Debug("exit keepRspChan for select")
}
}()
return nil
}
func (e *EtcdClient) Get(key string) map[string]string {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
resp, err := e.etcd.Get(ctx, fmt.Sprintf("/%s/", key))
cancel()
if err != nil {
logger.Error("etcd get key: %s, err: %v", key, err)
return nil
}
m := make(map[string]string)
for _, v := range resp.Kvs {
m[string(v.Key)] = string(v.Value)
}
return m
}
func (e *EtcdClient) GetByPrefix(prefix string) map[string]string {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
resp, err := e.etcd.Get(ctx, fmt.Sprintf("/%s/", prefix), clientv3.WithPrefix())
cancel()
if err != nil {
logger.Error("etcd get prefix: %s, err: %v", prefix, err)
return nil
}
m := make(map[string]string)
for _, v := range resp.Kvs {
m[string(v.Key)] = string(v.Value)
}
return m
}
func (e *EtcdClient) Close() {
e.etcd.Close()
}
func PutWithLeasePrefix(prefix, key, val string, ttl int64) error {
return GEtcdClient().PutWithLeasePrefix(prefix, key, val, ttl)
}
func CloseEtcd() {
GEtcdClient().Close()
}