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kv_store.go
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kv_store.go
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package etcd
import (
"context"
"encoding/base64"
"fmt"
"path"
"strings"
clientv3 "go.etcd.io/etcd/client/v3"
"github.com/rancher/opni/pkg/storage"
)
type genericKeyValueStore struct {
client *clientv3.Client
prefix string
}
func (s *genericKeyValueStore) Put(ctx context.Context, key string, value []byte) error {
if err := validateKey(key); err != nil {
return err
}
_, err := s.client.Put(ctx, path.Join(s.prefix, key), base64.StdEncoding.EncodeToString(value))
if err != nil {
return err
}
return nil
}
func (s *genericKeyValueStore) Get(ctx context.Context, key string) ([]byte, error) {
if err := validateKey(key); err != nil {
return nil, err
}
resp, err := s.client.Get(ctx, path.Join(s.prefix, key))
if err != nil {
return nil, err
}
if len(resp.Kvs) == 0 {
return nil, storage.ErrNotFound
}
return base64.StdEncoding.DecodeString(string(resp.Kvs[0].Value))
}
func (s *genericKeyValueStore) Delete(ctx context.Context, key string) error {
if err := validateKey(key); err != nil {
return err
}
resp, err := s.client.Delete(ctx, path.Join(s.prefix, key))
if err != nil {
return err
}
if resp.Deleted == 0 {
return storage.ErrNotFound
}
return nil
}
func (s *genericKeyValueStore) ListKeys(ctx context.Context, prefix string) ([]string, error) {
resp, err := s.client.Get(ctx, path.Join(s.prefix, prefix),
clientv3.WithPrefix(),
clientv3.WithKeysOnly(),
)
if err != nil {
return nil, err
}
keys := make([]string, len(resp.Kvs))
for i, kv := range resp.Kvs {
keys[i] = strings.TrimPrefix(string(kv.Key), s.prefix+"/")
}
return keys, nil
}
func validateKey(key string) error {
// etcd will check keys, but we need to check if the key is empty ourselves
// since we always prepend a prefix to the key
if key == "" {
return fmt.Errorf("key cannot be empty")
}
return nil
}