140 lines
2.9 KiB
Go
140 lines
2.9 KiB
Go
// Copyright 2014 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/>.
|
|
|
|
package ethdb
|
|
|
|
import (
|
|
"errors"
|
|
"sync"
|
|
|
|
"github.com/ethereum/go-ethereum/common"
|
|
)
|
|
|
|
/*
|
|
* This is a test memory database. Do not use for any production it does not get persisted
|
|
*/
|
|
type MemDatabase struct {
|
|
db map[string][]byte
|
|
lock sync.RWMutex
|
|
}
|
|
|
|
func NewMemDatabase() *MemDatabase {
|
|
return &MemDatabase{
|
|
db: make(map[string][]byte),
|
|
}
|
|
}
|
|
|
|
func NewMemDatabaseWithCap(size int) *MemDatabase {
|
|
return &MemDatabase{
|
|
db: make(map[string][]byte, size),
|
|
}
|
|
}
|
|
|
|
func (db *MemDatabase) Put(key []byte, value []byte) error {
|
|
db.lock.Lock()
|
|
defer db.lock.Unlock()
|
|
|
|
db.db[string(key)] = common.CopyBytes(value)
|
|
return nil
|
|
}
|
|
|
|
func (db *MemDatabase) Has(key []byte) (bool, error) {
|
|
db.lock.RLock()
|
|
defer db.lock.RUnlock()
|
|
|
|
_, ok := db.db[string(key)]
|
|
return ok, nil
|
|
}
|
|
|
|
func (db *MemDatabase) 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 *MemDatabase) 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 *MemDatabase) Delete(key []byte) error {
|
|
db.lock.Lock()
|
|
defer db.lock.Unlock()
|
|
|
|
delete(db.db, string(key))
|
|
return nil
|
|
}
|
|
|
|
func (db *MemDatabase) Close() {}
|
|
|
|
func (db *MemDatabase) NewBatch() Batch {
|
|
return &memBatch{db: db}
|
|
}
|
|
|
|
func (db *MemDatabase) Len() int { return len(db.db) }
|
|
|
|
type kv struct{ k, v []byte }
|
|
|
|
type memBatch struct {
|
|
db *MemDatabase
|
|
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) Delete(key []byte) error {
|
|
b.writes = append(b.writes, kv{common.CopyBytes(key), nil})
|
|
return nil
|
|
}
|
|
|
|
func (b *memBatch) Write() error {
|
|
b.db.lock.Lock()
|
|
defer b.db.lock.Unlock()
|
|
|
|
for _, kv := range b.writes {
|
|
if kv.v == nil {
|
|
delete(b.db.db, string(kv.k))
|
|
continue
|
|
}
|
|
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
|
|
}
|