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register.go
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/
register.go
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package discovery
import (
"context"
"errors"
"github.com/google/uuid"
"go.etcd.io/etcd/client/v3"
"log"
"time"
)
type Registrar interface {
Register(service Service) error
Deregister() error
}
type RegistrarEtcd struct {
ctx context.Context
cli *clientv3.Client
leaseID clientv3.LeaseID
leaseTTL int64
}
var _ Registrar = &RegistrarEtcd{}
const (
timeOut = 3 * time.Second
leaseTtl = 10
)
func NewRegistrarEtcd(endpoints []string) (*RegistrarEtcd, error) {
if len(endpoints) == 0 {
return nil, errors.New("endpoints is nil")
}
client, err := clientv3.New(clientv3.Config{
Endpoints: endpoints,
DialTimeout: timeOut,
})
if err != nil {
return nil, err
}
re := &RegistrarEtcd{
cli: client,
ctx: context.Background(),
leaseTTL: leaseTtl,
}
return re, nil
}
func (r *RegistrarEtcd) Register(service Service) error {
// 1.申请租约
grantRsp, err := r.cli.Grant(r.ctx, r.leaseTTL)
if err != nil {
return err
}
r.leaseID = grantRsp.ID
// 2.写入etcd并绑定租约
key := service.Name() + "_" + uuid.New().String()
_, err = r.cli.Put(r.ctx, key, service.Addr(), clientv3.WithLease(r.leaseID))
if err != nil {
return err
}
// 3.续约
aliveChan, err := r.cli.KeepAlive(r.ctx, r.leaseID)
if err != nil {
return err
}
go func() {
for c := range aliveChan {
log.Printf("keep alive, service name=%s,leaseID=%d\n", service.Name(), c.ID)
}
}()
return nil
}
func (r *RegistrarEtcd) Deregister() error {
// 1.撤销租约
_, err := r.cli.Revoke(r.ctx, r.leaseID)
if err != nil {
return err
}
// 2. 关闭连接
return r.cli.Close()
}