147 lines
3.0 KiB
Go
147 lines
3.0 KiB
Go
// Copyright 2014 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 ethdb
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import (
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"errors"
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"fmt"
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"sync"
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"github.com/ethereum/go-ethereum/common"
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)
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/*
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* This is a test memory database. Do not use for any production it does not get persisted
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*/
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type MemDatabase struct {
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db map[string][]byte
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lock sync.RWMutex
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}
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func NewMemDatabase() (*MemDatabase, error) {
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return &MemDatabase{
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db: make(map[string][]byte),
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}, nil
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}
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func (db *MemDatabase) Put(key []byte, value []byte) error {
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db.lock.Lock()
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defer db.lock.Unlock()
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db.db[string(key)] = common.CopyBytes(value)
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return nil
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}
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func (db *MemDatabase) Set(key []byte, value []byte) {
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db.lock.Lock()
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defer db.lock.Unlock()
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db.Put(key, value)
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}
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func (db *MemDatabase) Get(key []byte) ([]byte, error) {
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db.lock.RLock()
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defer db.lock.RUnlock()
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if entry, ok := db.db[string(key)]; ok {
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return entry, nil
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}
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return nil, errors.New("not found")
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}
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func (db *MemDatabase) Keys() [][]byte {
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db.lock.RLock()
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defer db.lock.RUnlock()
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keys := [][]byte{}
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for key, _ := range db.db {
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keys = append(keys, []byte(key))
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}
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return keys
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}
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/*
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func (db *MemDatabase) GetKeys() []*common.Key {
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data, _ := db.Get([]byte("KeyRing"))
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return []*common.Key{common.NewKeyFromBytes(data)}
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}
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*/
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func (db *MemDatabase) Delete(key []byte) error {
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db.lock.Lock()
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defer db.lock.Unlock()
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delete(db.db, string(key))
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return nil
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}
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func (db *MemDatabase) Print() {
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db.lock.RLock()
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defer db.lock.RUnlock()
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for key, val := range db.db {
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fmt.Printf("%x(%d): ", key, len(key))
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node := common.NewValueFromBytes(val)
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fmt.Printf("%q\n", node.Val)
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}
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}
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func (db *MemDatabase) Close() {
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}
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func (db *MemDatabase) LastKnownTD() []byte {
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data, _ := db.Get([]byte("LastKnownTotalDifficulty"))
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if len(data) == 0 || data == nil {
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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 (db *MemDatabase) NewBatch() Batch {
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return &memBatch{db: db}
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}
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type kv struct{ k, v []byte }
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type memBatch struct {
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db *MemDatabase
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writes []kv
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lock sync.RWMutex
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}
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func (b *memBatch) Put(key, value []byte) error {
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b.lock.Lock()
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defer b.lock.Unlock()
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b.writes = append(b.writes, kv{key, common.CopyBytes(value)})
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return nil
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}
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func (b *memBatch) Write() error {
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b.lock.RLock()
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defer b.lock.RUnlock()
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b.db.lock.Lock()
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defer b.db.lock.Unlock()
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for _, kv := range b.writes {
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b.db.db[string(kv.k)] = kv.v
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}
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return nil
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}
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