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memory_database.go
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memory_database.go
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// Modifications Copyright 2018 The klaytn Authors
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library 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 go-ethereum library 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 go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
//
// This file is derived from ethdb/memory_database.go (2018/06/04).
// Modified and improved for the klaytn development.
package database
import (
"errors"
"github.com/klaytn/klaytn/common"
"sync"
)
/*
* This is a test memory database. Do not use for any production it does not get persisted
*/
type MemDB struct {
db map[string][]byte
lock sync.RWMutex
}
func NewMemDB() *MemDB {
return &MemDB{
db: make(map[string][]byte),
}
}
func NewMemDBWithCap(size int) *MemDB {
return &MemDB{
db: make(map[string][]byte, size),
}
}
func (db *MemDB) Type() DBType {
return MemoryDB
}
func (db *MemDB) Put(key []byte, value []byte) error {
db.lock.Lock()
defer db.lock.Unlock()
db.db[string(key)] = common.CopyBytes(value)
return nil
}
func (db *MemDB) Has(key []byte) (bool, error) {
db.lock.RLock()
defer db.lock.RUnlock()
_, ok := db.db[string(key)]
return ok, nil
}
func (db *MemDB) Get(key []byte) ([]byte, error) {
db.lock.RLock()
defer db.lock.RUnlock()
if entry, ok := db.db[string(key)]; ok {
return common.CopyBytes(entry), nil
}
return nil, errors.New("not found")
}
func (db *MemDB) Keys() [][]byte {
db.lock.RLock()
defer db.lock.RUnlock()
keys := [][]byte{}
for key := range db.db {
keys = append(keys, []byte(key))
}
return keys
}
func (db *MemDB) Delete(key []byte) error {
db.lock.Lock()
defer db.lock.Unlock()
delete(db.db, string(key))
return nil
}
func (db *MemDB) Close() {}
func (db *MemDB) NewBatch() Batch {
return &memBatch{db: db}
}
func (db *MemDB) Len() int { return len(db.db) }
func (db *MemDB) Meter(prefix string) {
logger.Warn("MemDB does not support metrics!")
}
type kv struct{ k, v []byte }
type memBatch struct {
db *MemDB
writes []kv
size int
}
func (b *memBatch) Put(key, value []byte) error {
b.writes = append(b.writes, kv{common.CopyBytes(key), common.CopyBytes(value)})
b.size += len(value)
return nil
}
func (b *memBatch) Write() error {
b.db.lock.Lock()
defer b.db.lock.Unlock()
for _, kv := range b.writes {
b.db.db[string(kv.k)] = kv.v
}
return nil
}
func (b *memBatch) ValueSize() int {
return b.size
}
func (b *memBatch) Reset() {
b.writes = b.writes[:0]
b.size = 0
}