mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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d581dfee5f
Storing a value in LevelDB copies the bytes, modifying the value afterwards does not affect the content of the database. This commit ensures that MemDatabase satisfies the same property.
120 lines
2.6 KiB
Go
120 lines
2.6 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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"fmt"
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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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}
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func NewMemDatabase() (*MemDatabase, error) {
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db := &MemDatabase{db: make(map[string][]byte)}
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return db, nil
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}
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func (db *MemDatabase) Put(key []byte, value []byte) error {
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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.Put(key, value)
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}
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func (db *MemDatabase) Get(key []byte) ([]byte, error) {
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return db.db[string(key)], nil
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}
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func (db *MemDatabase) Keys() [][]byte {
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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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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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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) Flush() error {
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return nil
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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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}
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func (w *memBatch) Put(key, value []byte) error {
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w.writes = append(w.writes, kv{key, common.CopyBytes(value)})
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return nil
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}
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func (w *memBatch) Write() error {
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for _, kv := range w.writes {
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w.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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