mirror of
https://gitee.com/milvus-io/milvus.git
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637 lines
21 KiB
Go
637 lines
21 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// limitations under the License.
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// See the License for the specific language governing permissions and
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package etcdkv
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import (
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"context"
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"errors"
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"fmt"
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"path"
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"sync"
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"time"
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"github.com/milvus-io/milvus/internal/common"
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clientv3 "go.etcd.io/etcd/client/v3"
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"go.etcd.io/etcd/server/v3/embed"
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"go.etcd.io/etcd/server/v3/etcdserver/api/v3client"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/internal/kv"
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"github.com/milvus-io/milvus/internal/log"
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)
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// implementation assertion
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var _ kv.MetaKv = (*EmbedEtcdKV)(nil)
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// EmbedEtcdKV use embedded Etcd instance as a KV storage
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type EmbedEtcdKV struct {
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client *clientv3.Client
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rootPath string
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etcd *embed.Etcd
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closeOnce sync.Once
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}
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// NewEmbededEtcdKV creates a new etcd kv.
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func NewEmbededEtcdKV(cfg *embed.Config, rootPath string) (*EmbedEtcdKV, error) {
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e, err := embed.StartEtcd(cfg)
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if err != nil {
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return nil, err
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}
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client := v3client.New(e.Server)
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kv := &EmbedEtcdKV{
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client: client,
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rootPath: rootPath,
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etcd: e,
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}
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//wait until embed etcd is ready
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select {
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case <-e.Server.ReadyNotify():
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log.Info("Embedded etcd is ready!")
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case <-time.After(60 * time.Second):
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e.Server.Stop() // trigger a shutdown
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return nil, errors.New("Embedded etcd took too long to start")
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}
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return kv, nil
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}
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// Close closes the embedded etcd
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func (kv *EmbedEtcdKV) Close() {
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kv.closeOnce.Do(func() {
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kv.client.Close()
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kv.etcd.Close()
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})
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}
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// GetPath returns the full path by given key
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func (kv *EmbedEtcdKV) GetPath(key string) string {
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return path.Join(kv.rootPath, key)
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}
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// LoadWithPrefix returns all the keys and values with the given key prefix
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func (kv *EmbedEtcdKV) LoadWithPrefix(key string) ([]string, []string, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([]string, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, string(kv.Value))
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}
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return keys, values, nil
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}
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// LoadBytesWithPrefix returns all the keys and values with the given key prefix
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func (kv *EmbedEtcdKV) LoadBytesWithPrefix(key string) ([]string, [][]byte, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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}
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return keys, values, nil
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}
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// LoadWithPrefix2 returns all the keys and values with versions by the given key prefix
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func (kv *EmbedEtcdKV) LoadWithPrefix2(key string) ([]string, []string, []int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([]string, 0, resp.Count)
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versions := make([]int64, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, string(kv.Value))
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versions = append(versions, kv.Version)
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}
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return keys, values, versions, nil
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}
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func (kv *EmbedEtcdKV) LoadWithRevisionAndVersions(key string) ([]string, []string, []int64, int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, nil, 0, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([]string, 0, resp.Count)
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versions := make([]int64, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, string(kv.Value))
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versions = append(versions, kv.Version)
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}
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return keys, values, versions, resp.Header.Revision, nil
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}
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// LoadBytesWithPrefix2 returns all the keys and values with versions by the given key prefix
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func (kv *EmbedEtcdKV) LoadBytesWithPrefix2(key string) ([]string, [][]byte, []int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithPrefix2 ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, nil, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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versions := make([]int64, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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versions = append(versions, kv.Version)
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}
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return keys, values, versions, nil
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}
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// Load returns value of the given key
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func (kv *EmbedEtcdKV) Load(key string) (string, error) {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key)
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if err != nil {
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return "", err
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}
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if resp.Count <= 0 {
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return "", common.NewKeyNotExistError(key)
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}
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return string(resp.Kvs[0].Value), nil
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}
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// LoadBytes returns value of the given key
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func (kv *EmbedEtcdKV) LoadBytes(key string) ([]byte, error) {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key)
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if err != nil {
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return nil, err
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}
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if resp.Count <= 0 {
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return nil, common.NewKeyNotExistError(key)
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}
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return resp.Kvs[0].Value, nil
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}
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// MultiLoad returns values of a set of keys
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func (kv *EmbedEtcdKV) MultiLoad(keys []string) ([]string, error) {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, keyLoad := range keys {
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ops = append(ops, clientv3.OpGet(path.Join(kv.rootPath, keyLoad)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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if err != nil {
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return nil, err
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}
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result := make([]string, 0, len(keys))
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invalid := make([]string, 0, len(keys))
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for index, rp := range resp.Responses {
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if rp.GetResponseRange().Kvs == nil || len(rp.GetResponseRange().Kvs) == 0 {
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invalid = append(invalid, keys[index])
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result = append(result, "")
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}
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for _, ev := range rp.GetResponseRange().Kvs {
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log.Debug("MultiLoad", zap.ByteString("key", ev.Key),
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zap.ByteString("value", ev.Value))
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result = append(result, string(ev.Value))
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}
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}
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if len(invalid) != 0 {
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log.Debug("MultiLoad: there are invalid keys",
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zap.Strings("keys", invalid))
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err = fmt.Errorf("there are invalid keys: %s", invalid)
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return result, err
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}
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return result, nil
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}
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// MultiLoadBytes returns values of a set of keys
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func (kv *EmbedEtcdKV) MultiLoadBytes(keys []string) ([][]byte, error) {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, keyLoad := range keys {
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ops = append(ops, clientv3.OpGet(path.Join(kv.rootPath, keyLoad)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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if err != nil {
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return nil, err
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}
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result := make([][]byte, 0, len(keys))
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invalid := make([]string, 0, len(keys))
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for index, rp := range resp.Responses {
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if rp.GetResponseRange().Kvs == nil || len(rp.GetResponseRange().Kvs) == 0 {
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invalid = append(invalid, keys[index])
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result = append(result, []byte{})
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}
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for _, ev := range rp.GetResponseRange().Kvs {
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log.Debug("MultiLoadBytes", zap.ByteString("key", ev.Key),
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zap.ByteString("value", ev.Value))
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result = append(result, ev.Value)
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}
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}
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if len(invalid) != 0 {
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log.Debug("MultiLoadBytes: there are invalid keys",
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zap.Strings("keys", invalid))
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err = fmt.Errorf("there are invalid keys: %s", invalid)
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return result, err
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}
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return result, nil
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}
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// LoadWithRevision returns keys, values and revision with given key prefix.
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func (kv *EmbedEtcdKV) LoadWithRevision(key string) ([]string, []string, int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadWithPrefix ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, 0, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([]string, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, string(kv.Value))
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}
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return keys, values, resp.Header.Revision, nil
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}
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// LoadBytesWithRevision returns keys, values and revision with given key prefix.
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func (kv *EmbedEtcdKV) LoadBytesWithRevision(key string) ([]string, [][]byte, int64, error) {
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key = path.Join(kv.rootPath, key)
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log.Debug("LoadBytesWithRevision ", zap.String("prefix", key))
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(),
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clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
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if err != nil {
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return nil, nil, 0, err
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}
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keys := make([]string, 0, resp.Count)
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values := make([][]byte, 0, resp.Count)
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for _, kv := range resp.Kvs {
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keys = append(keys, string(kv.Key))
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values = append(values, kv.Value)
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}
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return keys, values, resp.Header.Revision, nil
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}
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// Save saves the key-value pair.
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func (kv *EmbedEtcdKV) Save(key, value string) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, value)
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return err
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}
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// SaveBytes saves the key-value pair.
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func (kv *EmbedEtcdKV) SaveBytes(key string, value []byte) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, string(value))
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return err
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}
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// SaveWithLease is a function to put value in etcd with etcd lease options.
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func (kv *EmbedEtcdKV) SaveWithLease(key, value string, id clientv3.LeaseID) error {
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log.Debug("Embedded Etcd saving with lease", zap.String("etcd_key", key))
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, value, clientv3.WithLease(id))
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return err
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}
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// SaveWithIgnoreLease updates the key without changing its current lease.
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func (kv *EmbedEtcdKV) SaveWithIgnoreLease(key, value string) error {
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log.Debug("Embedded Etcd saving with ignore lease", zap.String("etcd_key", key))
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, value, clientv3.WithIgnoreLease())
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return err
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}
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// SaveBytesWithLease is a function to put value in etcd with etcd lease options.
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func (kv *EmbedEtcdKV) SaveBytesWithLease(key string, value []byte, id clientv3.LeaseID) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Put(ctx, key, string(value), clientv3.WithLease(id))
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return err
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}
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// MultiSave saves the key-value pairs in a transaction.
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func (kv *EmbedEtcdKV) MultiSave(kvs map[string]string) error {
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ops := make([]clientv3.Op, 0, len(kvs))
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for key, value := range kvs {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// MultiSaveBytes saves the key-value pairs in a transaction.
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func (kv *EmbedEtcdKV) MultiSaveBytes(kvs map[string][]byte) error {
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ops := make([]clientv3.Op, 0, len(kvs))
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for key, value := range kvs {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// RemoveWithPrefix removes the keys with given prefix.
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func (kv *EmbedEtcdKV) RemoveWithPrefix(prefix string) error {
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key := path.Join(kv.rootPath, prefix)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Delete(ctx, key, clientv3.WithPrefix())
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return err
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}
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// Remove removes the key.
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func (kv *EmbedEtcdKV) Remove(key string) error {
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key = path.Join(kv.rootPath, key)
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Delete(ctx, key)
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return err
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}
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// MultiRemove removes the keys in a transaction.
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func (kv *EmbedEtcdKV) MultiRemove(keys []string) error {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, key := range keys {
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ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, key)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// MultiSaveAndRemove saves the key-value pairs and removes the keys in a transaction.
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func (kv *EmbedEtcdKV) MultiSaveAndRemove(saves map[string]string, removals []string) error {
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ops := make([]clientv3.Op, 0, len(saves)+len(removals))
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for key, value := range saves {
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ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
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}
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for _, keyDelete := range removals {
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ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete)))
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}
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ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
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defer cancel()
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_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
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return err
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}
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// MultiSaveBytesAndRemove saves the key-value pairs and removes the keys in a transaction.
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|
func (kv *EmbedEtcdKV) MultiSaveBytesAndRemove(saves map[string][]byte, removals []string) error {
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete)))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) Watch(key string) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithCreatedNotify())
|
|
return rch
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) WatchWithPrefix(key string) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithCreatedNotify())
|
|
return rch
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) WatchWithRevision(key string, revision int64) clientv3.WatchChan {
|
|
key = path.Join(kv.rootPath, key)
|
|
rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithPrevKV(), clientv3.WithRev(revision))
|
|
return rch
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) MultiRemoveWithPrefix(keys []string) error {
|
|
ops := make([]clientv3.Op, 0, len(keys))
|
|
for _, k := range keys {
|
|
op := clientv3.OpDelete(path.Join(kv.rootPath, k), clientv3.WithPrefix())
|
|
ops = append(ops, op)
|
|
}
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
// MultiSaveAndRemoveWithPrefix saves kv in @saves and removes the keys with given prefix in @removals.
|
|
func (kv *EmbedEtcdKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string) error {
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), value))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete), clientv3.WithPrefix()))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
// MultiSaveBytesAndRemoveWithPrefix saves kv in @saves and removes the keys with given prefix in @removals.
|
|
func (kv *EmbedEtcdKV) MultiSaveBytesAndRemoveWithPrefix(saves map[string][]byte, removals []string) error {
|
|
ops := make([]clientv3.Op, 0, len(saves)+len(removals))
|
|
for key, value := range saves {
|
|
ops = append(ops, clientv3.OpPut(path.Join(kv.rootPath, key), string(value)))
|
|
}
|
|
|
|
for _, keyDelete := range removals {
|
|
ops = append(ops, clientv3.OpDelete(path.Join(kv.rootPath, keyDelete), clientv3.WithPrefix()))
|
|
}
|
|
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
|
|
_, err := kv.client.Txn(ctx).If().Then(ops...).Commit()
|
|
return err
|
|
}
|
|
|
|
// Grant creates a new lease implemented in etcd grant interface.
|
|
func (kv *EmbedEtcdKV) Grant(ttl int64) (id clientv3.LeaseID, err error) {
|
|
resp, err := kv.client.Grant(context.Background(), ttl)
|
|
return resp.ID, err
|
|
}
|
|
|
|
// KeepAlive keeps the lease alive forever with leaseID.
|
|
// Implemented in etcd interface.
|
|
func (kv *EmbedEtcdKV) KeepAlive(id clientv3.LeaseID) (<-chan *clientv3.LeaseKeepAliveResponse, error) {
|
|
ch, err := kv.client.KeepAlive(context.Background(), id)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return ch, nil
|
|
}
|
|
|
|
// CompareValueAndSwap compares the existing value with compare, and if they are
|
|
// equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareValueAndSwap(key, value, target string, opts ...clientv3.OpOption) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Value(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
value)).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), target, opts...)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
// CompareValueAndSwapBytes compares the existing value with compare, and if they are
|
|
// equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareValueAndSwapBytes(key string, value, target []byte, opts ...clientv3.OpOption) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Value(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
string(value))).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), string(target), opts...)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
// CompareVersionAndSwap compares the existing key-value's version with version, and if
|
|
// they are equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareVersionAndSwap(key string, version int64, target string, opts ...clientv3.OpOption) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Version(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
version)).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), target, opts...)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
// CompareVersionAndSwapBytes compares the existing key-value's version with version, and if
|
|
// they are equal, the target is stored in etcd.
|
|
func (kv *EmbedEtcdKV) CompareVersionAndSwapBytes(key string, version int64, target []byte, opts ...clientv3.OpOption) (bool, error) {
|
|
ctx, cancel := context.WithTimeout(context.TODO(), RequestTimeout)
|
|
defer cancel()
|
|
resp, err := kv.client.Txn(ctx).If(
|
|
clientv3.Compare(
|
|
clientv3.Version(path.Join(kv.rootPath, key)),
|
|
"=",
|
|
version)).
|
|
Then(clientv3.OpPut(path.Join(kv.rootPath, key), string(target), opts...)).Commit()
|
|
if err != nil {
|
|
return false, err
|
|
}
|
|
return resp.Succeeded, nil
|
|
}
|
|
|
|
func (kv *EmbedEtcdKV) GetConfig() embed.Config {
|
|
return kv.etcd.Config()
|
|
}
|