mirror of
https://gitee.com/milvus-io/milvus.git
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374 lines
11 KiB
Go
374 lines
11 KiB
Go
// Copyright (C) 2019-2020 Zilliz. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "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 distributed under the License
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// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
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// or implied. See the License for the specific language governing permissions and limitations under the License.
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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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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/log"
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)
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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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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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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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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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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) 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 "", fmt.Errorf("there is no value on key = %s", key)
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}
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return string(resp.Kvs[0].Value), nil
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}
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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 []string{}, 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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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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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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// 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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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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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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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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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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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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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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log.Debug("MultiSaveAndRemove")
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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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func (kv *EmbedEtcdKV) Watch(key string) clientv3.WatchChan {
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key = path.Join(kv.rootPath, key)
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rch := kv.client.Watch(context.Background(), key, clientv3.WithCreatedNotify())
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return rch
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}
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func (kv *EmbedEtcdKV) WatchWithPrefix(key string) clientv3.WatchChan {
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key = path.Join(kv.rootPath, key)
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rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithCreatedNotify())
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return rch
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}
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func (kv *EmbedEtcdKV) WatchWithRevision(key string, revision int64) clientv3.WatchChan {
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key = path.Join(kv.rootPath, key)
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rch := kv.client.Watch(context.Background(), key, clientv3.WithPrefix(), clientv3.WithPrevKV(), clientv3.WithRev(revision))
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return rch
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}
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func (kv *EmbedEtcdKV) MultiRemoveWithPrefix(keys []string) error {
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ops := make([]clientv3.Op, 0, len(keys))
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for _, k := range keys {
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op := clientv3.OpDelete(path.Join(kv.rootPath, k), clientv3.WithPrefix())
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ops = append(ops, op)
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}
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log.Debug("MultiRemoveWithPrefix")
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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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func (kv *EmbedEtcdKV) MultiSaveAndRemoveWithPrefix(saves map[string]string, removals []string) error {
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ops := make([]clientv3.Op, 0, len(saves))
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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), clientv3.WithPrefix()))
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}
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log.Debug("MultiSaveAndRemove")
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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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// Grant creates a new lease implemented in etcd grant interface.
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func (kv *EmbedEtcdKV) Grant(ttl int64) (id clientv3.LeaseID, err error) {
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resp, err := kv.client.Grant(context.Background(), ttl)
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return resp.ID, err
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}
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// KeepAlive keeps the lease alive forever with leaseID.
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// Implemented in etcd interface.
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func (kv *EmbedEtcdKV) KeepAlive(id clientv3.LeaseID) (<-chan *clientv3.LeaseKeepAliveResponse, error) {
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ch, err := kv.client.KeepAlive(context.Background(), id)
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if err != nil {
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return nil, err
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}
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return ch, nil
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}
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// CompareValueAndSwap compares the existing value with compare, and if they are
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// equal, the target is stored in etcd.
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func (kv *EmbedEtcdKV) CompareValueAndSwap(key, value, target string, opts ...clientv3.OpOption) error {
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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(
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clientv3.Compare(
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clientv3.Value(path.Join(kv.rootPath, key)),
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"=",
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value)).
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Then(clientv3.OpPut(path.Join(kv.rootPath, key), target, opts...)).Commit()
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if err != nil {
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return err
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}
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if !resp.Succeeded {
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return fmt.Errorf("function CompareAndSwap error for compare is false for key: %s", key)
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}
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return nil
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}
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// CompareVersionAndSwap compares the existing key-value's version with version, and if
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// they are equal, the target is stored in etcd.
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func (kv *EmbedEtcdKV) CompareVersionAndSwap(key string, version int64, target string, opts ...clientv3.OpOption) error {
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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(
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clientv3.Compare(
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clientv3.Version(path.Join(kv.rootPath, key)),
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"=",
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version)).
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Then(clientv3.OpPut(path.Join(kv.rootPath, key), target, opts...)).Commit()
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if err != nil {
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return err
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}
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if !resp.Succeeded {
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return fmt.Errorf("function CompareAndSwap error for compare is false for key: %s", key)
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}
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return nil
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}
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func (kv *EmbedEtcdKV) GetConfig() embed.Config {
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return kv.etcd.Config()
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}
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