forked from ontio/ontology
/
leveldb_store.go
159 lines (134 loc) · 3.91 KB
/
leveldb_store.go
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/*
* Copyright (C) 2018 The ontology Authors
* This file is part of The ontology library.
*
* The ontology is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The ontology is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The ontology. If not, see <http://www.gnu.org/licenses/>.
*/
package leveldbstore
import (
"github.com/qbyyf/go-ethereum/common/fdlimit"
"github.com/qbyyf/ontology/core/store/common"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/storage"
"github.com/syndtr/goleveldb/leveldb/util"
)
//LevelDB store
type LevelDBStore struct {
db *leveldb.DB // LevelDB instance
batch *leveldb.Batch
}
// used to compute the size of bloom filter bits array .
// too small will lead to high false positive rate.
const BITSPERKEY = 10
//NewLevelDBStore return LevelDBStore instance
func NewLevelDBStore(file string) (*LevelDBStore, error) {
openFileCache := opt.DefaultOpenFilesCacheCapacity
maxOpenFiles, err := fdlimit.Current()
if err == nil && maxOpenFiles < openFileCache*5 {
openFileCache = maxOpenFiles / 5
}
if openFileCache < 16 {
openFileCache = 16
}
// default Options
o := opt.Options{
NoSync: false,
OpenFilesCacheCapacity: openFileCache,
Filter: filter.NewBloomFilter(BITSPERKEY),
}
db, err := leveldb.OpenFile(file, &o)
if _, corrupted := err.(*errors.ErrCorrupted); corrupted {
db, err = leveldb.RecoverFile(file, nil)
}
if err != nil {
return nil, err
}
return &LevelDBStore{
db: db,
batch: nil,
}, nil
}
func NewMemLevelDBStore() *LevelDBStore {
store := storage.NewMemStorage()
// default Options
o := opt.Options{
NoSync: false,
Filter: filter.NewBloomFilter(BITSPERKEY),
}
db, err := leveldb.Open(store, &o)
if err != nil {
panic(err)
}
return &LevelDBStore{
db: db,
batch: nil,
}
}
//Put a key-value pair to leveldb
func (self *LevelDBStore) Put(key []byte, value []byte) error {
return self.db.Put(key, value, nil)
}
//Get the value of a key from leveldb
func (self *LevelDBStore) Get(key []byte) ([]byte, error) {
dat, err := self.db.Get(key, nil)
if err != nil {
if err == leveldb.ErrNotFound {
return nil, common.ErrNotFound
}
return nil, err
}
return dat, nil
}
//Has return whether the key is exist in leveldb
func (self *LevelDBStore) Has(key []byte) (bool, error) {
return self.db.Has(key, nil)
}
//Delete the the in leveldb
func (self *LevelDBStore) Delete(key []byte) error {
return self.db.Delete(key, nil)
}
//NewBatch start commit batch
func (self *LevelDBStore) NewBatch() {
self.batch = new(leveldb.Batch)
}
//BatchPut put a key-value pair to leveldb batch
func (self *LevelDBStore) BatchPut(key []byte, value []byte) {
self.batch.Put(key, value)
}
//BatchDelete delete a key to leveldb batch
func (self *LevelDBStore) BatchDelete(key []byte) {
self.batch.Delete(key)
}
//BatchCommit commit batch to leveldb
func (self *LevelDBStore) BatchCommit() error {
err := self.db.Write(self.batch, nil)
if err != nil {
return err
}
self.batch = nil
return nil
}
//Close leveldb
func (self *LevelDBStore) Close() error {
err := self.db.Close()
return err
}
//NewIterator return a iterator of leveldb with the key prefix
func (self *LevelDBStore) NewIterator(prefix []byte) common.StoreIterator {
iter := self.db.NewIterator(util.BytesPrefix(prefix), nil)
return iter
}