mirror of https://github.com/milvus-io/milvus.git
89 lines
2.1 KiB
Go
89 lines
2.1 KiB
Go
package kv
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import (
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"context"
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"github.com/zilliztech/milvus-distributed/internal/errors"
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"go.etcd.io/etcd/clientv3"
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"log"
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"path"
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"time"
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)
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const (
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requestTimeout = 10 * time.Second
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)
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type EtcdKV struct {
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client *clientv3.Client
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rootPath string
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}
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// NewEtcdKV creates a new etcd kv.
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func NewEtcdKV(client *clientv3.Client, rootPath string) *EtcdKV {
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return &EtcdKV{
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client: client,
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rootPath: rootPath,
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}
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}
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func (kv *EtcdKV) Close() {
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kv.client.Close()
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}
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func (kv *EtcdKV) LoadWithPrefix(key string) ([]string, []string, error) {
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key = path.Join(kv.rootPath, key)
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log.Printf("LoadWithPrefix %s", key)
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ctx, _ := context.WithTimeout(context.TODO(), requestTimeout)
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resp, err := kv.client.Get(ctx, key, clientv3.WithPrefix(), 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 *EtcdKV) Load(key string) (string, error) {
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key = path.Join(kv.rootPath, key)
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ctx, _ := context.WithTimeout(context.TODO(), requestTimeout)
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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 "", errors.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 *EtcdKV) Save(key, value string) error {
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key = path.Join(kv.rootPath, key)
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ctx, _ := context.WithTimeout(context.TODO(), requestTimeout)
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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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func (kv *EtcdKV) Remove(key string) error {
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key = path.Join(kv.rootPath, key)
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ctx, _ := context.WithTimeout(context.TODO(), requestTimeout)
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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 *EtcdKV) 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)
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return rch
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}
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func (kv *EtcdKV) 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())
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return rch
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}
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