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register.go
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register.go
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package etcd
import (
"context"
"fmt"
"log"
"strings"
"time"
"go.etcd.io/etcd/clientv3"
)
// Register register service with name as prefix to etcd, multi etcd addr should use ; to split
//etcdAddr etcd地址
//name 服务名称
//addr 服务的地址
//ttl 服务注册在etcd键的过期时间
func Register(etcdAddr, name string, addr string, ttl int64) error {
var err error
//创建etcd的连接
if cli == nil {
cli, err = clientv3.New(clientv3.Config{
Endpoints: strings.Split(etcdAddr, ";"),
DialTimeout: 15 * time.Second,
})
if err != nil {
fmt.Printf("connect to etcd err:%s", err)
return err
}
}
//时间定时器返回channel
ticker := time.NewTicker(time.Second * time.Duration(ttl))
//定时上传服务到etcd,并设置键的过期时间
//时间定时器的时间与过期时间相同(防止无服务挂了,etcd上数据还在)
go func() {
for {
getResp, err := cli.Get(context.Background(), "/"+schema+"/"+name+"/"+addr)
//fmt.Printf("getResp:%+v\n",getResp)
if err != nil {
log.Println(err)
fmt.Printf("Register:%s", err)
} else if getResp.Count == 0 {
err = withAlive(name, addr, ttl)
if err != nil {
log.Println(err)
fmt.Printf("keep alive:%s", err)
}
} else {
//fmt.Printf("getResp:%+v, do nothing\n",getResp)
}
<-ticker.C
}
}()
return nil
}
func withAlive(name string, addr string, ttl int64) error {
leaseResp, err := cli.Grant(context.Background(), ttl)
if err != nil {
return err
}
//fmt.Printf("key:%v\n", "/"+schema+"/"+name+"/"+addr)
_, err = cli.Put(context.Background(), "/"+schema+"/"+name+"/"+addr, addr, clientv3.WithLease(leaseResp.ID))
if err != nil {
fmt.Printf("put etcd error:%s", err)
return err
}
_, err = cli.KeepAlive(context.Background(), leaseResp.ID)
if err != nil {
fmt.Printf("keep alive error:%s", err)
return err
}
return nil
}
// UnRegister remove service from etcd
func UnRegister(name string, addr string) {
if cli != nil {
cli.Delete(context.Background(), "/"+schema+"/"+name+"/"+addr)
}
}