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etcd.go
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etcd.go
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package etcdv3
import (
"errors"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/pkg/transport"
"github.com/golang/glog"
"golang.org/x/net/context"
"time"
"net"
"net/http"
)
type EtcdV3 struct {
client *clientv3.Client
ctx context.Context
timeOut time.Duration
}
func newHTTPSTransport(certFile, keyFile, caFile string) (*http.Transport, error) {
info := transport.TLSInfo{
CertFile: certFile,
KeyFile: keyFile,
CAFile: caFile,
}
cfg, err := info.ClientConfig()
if err != nil {
return nil, err
}
tr := &http.Transport{
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
TLSClientConfig: cfg,
}
return tr, nil
}
func (etcdcli *EtcdV3) ttlOpts(ctx context.Context, ttl int64) ([]clientv3.OpOption, error) {
if ttl == 0 {
return nil, nil
}
// put keys within into same lease. We shall benchmark this and optimize the performance.
lcr, err := etcdcli.client.Lease.Grant(ctx, ttl)
if err != nil {
return nil, err
}
return []clientv3.OpOption{clientv3.WithLease(clientv3.LeaseID(lcr.ID))}, nil
}
func notFound(key string) clientv3.Cmp {
return clientv3.Compare(clientv3.ModRevision(key), "=", 0)
}
func keyFound(key string) clientv3.Cmp {
return clientv3.Compare(clientv3.ModRevision(key), ">", 0)
}
func (etcdcli *EtcdV3) InitEtcd(etcdServerList []string, etcdCertfile, etcdKeyFile, etcdCafile string) error {
tr, err := newHTTPSTransport(etcdCertfile, etcdKeyFile, etcdCafile)
if err != nil {
return err
}
etcdCfg := clientv3.Config{
Endpoints: etcdServerList,
TLS: tr.TLSClientConfig,
}
etcdClient, err := clientv3.New(etcdCfg)
if err != nil {
return err
}
etcdcli.client = etcdClient
etcdcli.ctx = context.Background()
etcdcli.timeOut = 30 * time.Second
return nil
}
// Get implements storage.Interface.Get.
func (etcdcli *EtcdV3) Get(key string, recursive bool) (*clientv3.GetResponse, error) {
var getResp *clientv3.GetResponse
var err error
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
if recursive {
getResp, err = etcdcli.client.KV.Get(ctx, key, clientv3.WithPrefix())
} else {
getResp, err = etcdcli.client.KV.Get(ctx, key)
}
if err != nil {
return nil, err
}
if len(getResp.Kvs) == 0 {
return nil, errors.New("key not found")
}
return getResp, nil
}
// Create implements storage.Interface.Creat
func (etcdcli *EtcdV3) Set(key string, val string) error {
glog.V(4).Infof("#####set key=%s val =%s\n ", key,val)
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
opts, err := etcdcli.ttlOpts(ctx, int64(0))
if err != nil {
return err
}
txnResp, err := etcdcli.client.KV.Txn(ctx).If(
notFound(key),
).Then(
clientv3.OpPut(key, val, opts...),
).Commit()
if err != nil {
return err
}
if !txnResp.Succeeded {
return errors.New("key exists")
}
return nil
}
// Create implements storage.Interface.Creat
func (etcdcli *EtcdV3) SetKeys(keys []string, vals []string) error {
glog.V(4).Infof("#####set keys=%s vals =%s\n ", keys,vals)
if len(keys) != len(vals){
return errors.New("not match ")
}
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
opts, err := etcdcli.ttlOpts(ctx, int64(0))
if err != nil {
return err
}
var ifOps [] clientv3.Cmp
var setOps [] clientv3.Op
for idx ,key := range keys{
ifOp := notFound(key)
setOp := clientv3.OpPut(key, vals[idx], opts...)
ifOps = append(ifOps,ifOp)
setOps = append(setOps,setOp)
}
txnResp, err := etcdcli.client.KV.Txn(ctx).If(
ifOps...
).Then(
setOps...
).Commit()
if err != nil {
return err
}
if !txnResp.Succeeded {
return errors.New("key exists")
}
return nil
}
// Create implements storage.Interface.Creat
func (etcdcli *EtcdV3) DeleteKeys(keys []string) error {
glog.V(4).Infof("#####DeleteKeys keys=%s \n ", keys)
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
var ifOps [] clientv3.Cmp
var delOps [] clientv3.Op
for _ ,key := range keys{
ifOp := keyFound(key)
delOp := clientv3.OpDelete(key)
ifOps = append(ifOps,ifOp)
delOps = append(delOps,delOp)
}
txnResp, err := etcdcli.client.KV.Txn(ctx).If(
ifOps...
).Then(
delOps...
).Commit()
if err != nil {
return err
}
if !txnResp.Succeeded {
return errors.New("key not exists")
}
return nil
}
// Create implements storage.Interface.Creat
func (etcdcli *EtcdV3) DeleteAndSetKey(keyOld,keyNew,value string) error {
glog.V(4).Infof("#####DeleteAndSetKey keyOld=%s keyNew=%s value =%s\n ", keyOld,keyNew,value )
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
opts, err := etcdcli.ttlOpts(ctx, int64(0))
if err != nil {
return err
}
txnResp, err := etcdcli.client.KV.Txn(ctx).If(
keyFound(keyOld),
notFound(keyNew),
).Then(
clientv3.OpDelete(keyOld),
clientv3.OpPut(keyNew, value, opts...),
).Commit()
if err != nil {
return err
}
if !txnResp.Succeeded {
return errors.New("del or set key err")
}
return nil
}
func (etcdcli *EtcdV3) Update(key string, val string, valPre string) error {
glog.V(4).Infof("##### Update key=%s val =%s valPre =%s\n ", key,val,valPre)
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
opts, err := etcdcli.ttlOpts(ctx, int64(0))
if err != nil {
return err
}
txnResp, err := etcdcli.client.KV.Txn(ctx).If(
clientv3.Compare(clientv3.Value(key), "=", valPre),
).Then(
clientv3.OpPut(key, val, opts...),
).Commit()
if err != nil {
return err
}
if !txnResp.Succeeded {
return errors.New("Update error")
}
return nil
}
func (etcdcli *EtcdV3) DoDelete(key string) error {
// We need to do get and delete in single transaction in order to
// know the value and revision before deleting it.
ctx, cancel := context.WithTimeout(etcdcli.ctx, etcdcli.timeOut)
defer cancel()
txnResp, err := etcdcli.client.KV.Txn(ctx).If().Then(
clientv3.OpGet(key),
clientv3.OpDelete(key),
).Commit()
if err != nil {
return err
}
getResp := txnResp.Responses[0].GetResponseRange()
if len(getResp.Kvs) == 0 {
return errors.New("key not found")
}
return nil
}
func (etcdcli *EtcdV3) Delete(res *clientv3.GetResponse) error {
var keys [] string
for _, item := range res.Kvs {
keys = append(keys, string(item.Key))
}
return etcdcli.DeleteKeys(keys)
}
func (s *EtcdV3)Watch(ctx context.Context, key string, opts ...clientv3.OpOption) clientv3.WatchChan {
return s.client.Watch(ctx, key, opts...)
}