/
bolt.go
131 lines (118 loc) · 3.05 KB
/
bolt.go
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/* Copyright 2022 Zinc Labs Inc. and Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package bolt
import (
"bytes"
"os"
"path"
"github.com/rs/zerolog/log"
"go.etcd.io/bbolt"
"github.com/zincsearch/zincsearch/pkg/config"
"github.com/zincsearch/zincsearch/pkg/errors"
"github.com/zincsearch/zincsearch/pkg/metadata/storage"
)
type boltStorage struct {
db *bbolt.DB
}
func New(dbpath string) storage.Storager {
db, err := openbboltDB(path.Join(config.Global.DataPath, dbpath), false)
if err != nil {
log.Fatal().Err(err).Msg("open bbolt db for metadata failed")
}
return &boltStorage{db}
}
func openbboltDB(dbpath string, readOnly bool) (*bbolt.DB, error) {
opt := &bbolt.Options{
Timeout: 0,
NoGrowSync: false,
FreelistType: bbolt.FreelistArrayType,
}
if err := os.MkdirAll(path.Dir(dbpath), 0o755); err != nil {
return nil, err
}
return bbolt.Open(dbpath, 0o666, opt)
}
func (t *boltStorage) List(prefix string, _, _ int) ([][]byte, error) {
data := make([][]byte, 0)
bucket, _ := t.splitBucketAndKey(prefix)
err := t.db.View(func(txn *bbolt.Tx) error {
b := txn.Bucket(bucket)
if b == nil {
return nil
}
c := b.Cursor()
for k, v := c.First(); k != nil; k, v = c.Next() {
valCopy := make([]byte, len(v))
copy(valCopy, v)
data = append(data, valCopy)
}
return nil
})
return data, err
}
func (t *boltStorage) Get(key string) ([]byte, error) {
var data []byte
bucket, name := t.splitBucketAndKey(key)
err := t.db.View(func(txn *bbolt.Tx) error {
b := txn.Bucket(bucket)
if b == nil {
return errors.ErrKeyNotFound
}
v := b.Get(name)
if v == nil {
return errors.ErrKeyNotFound
}
data = make([]byte, len(v))
copy(data, v)
return nil
})
return data, err
}
func (t *boltStorage) Set(key string, value []byte) error {
if key == "" {
return errors.ErrKeyEmpty
}
bucket, name := t.splitBucketAndKey(key)
return t.db.Update(func(txn *bbolt.Tx) error {
b, err := txn.CreateBucketIfNotExists(bucket)
if err != nil {
return err
}
return b.Put(name, value)
})
}
func (t *boltStorage) Delete(key string) error {
if key == "" {
return errors.ErrKeyEmpty
}
bucket, name := t.splitBucketAndKey(key)
return t.db.Update(func(Tx *bbolt.Tx) error {
b := Tx.Bucket(bucket)
if b == nil {
return nil
}
return b.Delete(name)
})
}
func (t *boltStorage) Close() error {
return t.db.Close()
}
func (t *boltStorage) splitBucketAndKey(key string) ([]byte, []byte) {
if key == "" {
return nil, nil
}
p := bytes.LastIndex([]byte(key), []byte("/"))
return []byte(key[:p]), []byte(key[p+1:])
}