/
etcd.go
151 lines (137 loc) · 3.5 KB
/
etcd.go
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package pketcd
import (
"context"
"fmt"
"log"
"time"
clientv3 "go.etcd.io/etcd/client/v3"
)
type EtcdClient struct {
client *clientv3.Client
Kv clientv3.KV
prefix string
}
func NewEtcdClient(config clientv3.Config) (*EtcdClient, error) {
cli, err := clientv3.New(config)
if err != nil {
return nil, err
}
return &EtcdClient{client: cli, Kv: clientv3.KV(cli)}, nil
}
func (cli *EtcdClient) GetClient() *clientv3.Client {
return cli.client
}
func (cli *EtcdClient) SetNx(ctx context.Context, key, value string, ops ...clientv3.OpOption) (int, error) {
txnRes, err := cli.client.Txn(ctx).
If(clientv3.Compare(clientv3.CreateRevision(key), "=", "0")).
Then(clientv3.OpPut(key, value, ops...)).
Commit()
if err != nil {
return 0, err
}
if txnRes.Succeeded {
return 1, nil
}
return 0, nil
}
func (cli *EtcdClient) Locker(ctx context.Context, lockKey string, leaseTtl int64) (bool, error) {
if lockKey == "" {
return false, fmt.Errorf("lockKey is null")
}
lease := clientv3.NewLease(cli.client)
grant, err := lease.Grant(ctx, leaseTtl)
if err != nil {
return false, fmt.Errorf("Grant lease err:%v", err)
}
lockValue := fmt.Sprintf("%d", time.Now().UnixNano())
keepRespChan, err := lease.KeepAlive(ctx, grant.ID)
if err != nil {
return false, fmt.Errorf("KeepAlive err:%v", err)
}
// 续约应答
go func() {
for {
select {
case keepResp := <-keepRespChan:
if keepResp == nil {
return
}
case <-ctx.Done():
return
}
}
}()
resp, err := cli.client.Txn(ctx).
If(clientv3.Compare(clientv3.CreateRevision(lockKey), "=", 0)).
Then(clientv3.OpPut(lockKey, lockValue, clientv3.WithLease(grant.ID))).
Commit()
if err != nil {
return false, fmt.Errorf("put txn err:%v", err)
}
if resp.Succeeded {
return true, nil
}
return false, nil
}
func (cli *EtcdClient) Unlocker(ctx context.Context, lockKey string) error {
_, err := cli.client.Delete(ctx, lockKey)
if err != nil {
return err
}
return nil
}
func (cli *EtcdClient) SvcRegister(ctx context.Context, prefixKey string, value string, leaseTtl int64) error {
grant, err := cli.client.Grant(ctx, leaseTtl)
if err != nil {
return err
}
_, err = cli.client.Put(ctx, prefixKey, value, clientv3.WithLease(grant.ID))
if err != nil {
return err
}
go cli.keepAliveChan(ctx, grant.ID)
return nil
}
func (cli *EtcdClient) keepAliveChan(ctx context.Context, leaseID clientv3.LeaseID) {
lease := clientv3.NewLease(cli.client)
// 进行持续的续约
leaseChan, err := lease.KeepAlive(ctx, leaseID)
if err != nil {
log.Fatal("lease register keepAlive faith... err: ", err)
}
for {
select {
case <-ctx.Done():
return
case _ = <-leaseChan:
}
}
}
func (cli *EtcdClient) SvcDiscover(ctx context.Context, prefixKey string, whenGet func(string, string), whenDel func(string, string)) error {
kvCli := clientv3.KV(cli.client)
kvRes, err := kvCli.Get(ctx, prefixKey, clientv3.WithPrefix())
if err != nil {
return err
}
for idx := range kvRes.Kvs {
kv := kvRes.Kvs[idx]
whenGet(string(kv.Key), string(kv.Value))
}
watcher := clientv3.NewWatcher(cli.client)
watchChan := watcher.Watch(context.Background(), prefixKey, clientv3.WithPrefix())
go func() {
for watchResponse := range watchChan {
for _, e := range watchResponse.Events {
switch e.Type {
// [新增 | 修改]
case clientv3.EventTypePut:
whenGet(string(e.Kv.Key), string(e.Kv.Value))
// 删除
case clientv3.EventTypeDelete:
whenDel(string(e.Kv.Key), string(e.Kv.Value))
}
}
}
}()
return nil
}