89 lines
2.2 KiB
Go
89 lines
2.2 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package storage
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// this is a clone of an earlier state of the ethereum ethdb/database
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// no need for queueing/caching
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import (
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"fmt"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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)
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const openFileLimit = 128
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type LDBDatabase struct {
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db *leveldb.DB
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}
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func NewLDBDatabase(file string) (*LDBDatabase, error) {
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// Open the db
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db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: openFileLimit})
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if err != nil {
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return nil, err
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}
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database := &LDBDatabase{db: db}
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return database, nil
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}
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func (self *LDBDatabase) Put(key []byte, value []byte) {
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err := self.db.Put(key, value, nil)
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if err != nil {
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fmt.Println("Error put", err)
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}
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}
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func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
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dat, err := self.db.Get(key, nil)
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if err != nil {
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return nil, err
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}
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return dat, nil
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}
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func (self *LDBDatabase) Delete(key []byte) error {
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return self.db.Delete(key, nil)
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}
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func (self *LDBDatabase) LastKnownTD() []byte {
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data, _ := self.Get([]byte("LTD"))
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if len(data) == 0 {
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data = []byte{0x0}
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}
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return data
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}
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func (self *LDBDatabase) NewIterator() iterator.Iterator {
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return self.db.NewIterator(nil, nil)
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}
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func (self *LDBDatabase) Write(batch *leveldb.Batch) error {
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return self.db.Write(batch, nil)
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}
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func (self *LDBDatabase) Close() {
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// Close the leveldb database
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self.db.Close()
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}
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