plugeth/ethdb/memory_database.go

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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
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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
// 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,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// 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/>.
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package ethdb
import (
"errors"
"sync"
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"github.com/ethereum/go-ethereum/common"
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)
/*
* 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
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}
func NewMemDatabase() (*MemDatabase, error) {
return &MemDatabase{
db: make(map[string][]byte),
}, nil
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}
func NewMemDatabaseWithCap(size int) (*MemDatabase, error) {
return &MemDatabase{
db: make(map[string][]byte, size),
}, nil
}
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
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}
func (db *MemDatabase) Has(key []byte) (bool, error) {
db.lock.RLock()
defer db.lock.RUnlock()
_, ok := db.db[string(key)]
return ok, nil
}
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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")
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}
func (db *MemDatabase) Keys() [][]byte {
db.lock.RLock()
defer db.lock.RUnlock()
keys := [][]byte{}
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for key := range db.db {
keys = append(keys, []byte(key))
}
return keys
}
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func (db *MemDatabase) Delete(key []byte) error {
db.lock.Lock()
defer db.lock.Unlock()
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delete(db.db, string(key))
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return nil
}
func (db *MemDatabase) Close() {}
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func (db *MemDatabase) NewBatch() Batch {
return &memBatch{db: db}
}
func (db *MemDatabase) Len() int { return len(db.db) }
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type kv struct{ k, v []byte }
type memBatch struct {
db *MemDatabase
writes []kv
size int
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}
func (b *memBatch) Put(key, value []byte) error {
b.writes = append(b.writes, kv{common.CopyBytes(key), common.CopyBytes(value)})
b.size += len(value)
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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
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}
return nil
}
func (b *memBatch) ValueSize() int {
return b.size
}