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/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file OverlayDB.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#pragma warning(push)
#pragma warning(disable: 4100 4267)
#include <leveldb/db.h>
#pragma warning(pop)
#include <memory>
#include <libdevcore/Common.h>
#include <libdevcore/Log.h>
#include "MemoryDB.h"
namespace ldb = leveldb;
namespace dev
{
class OverlayDB: public MemoryDB
{
public:
OverlayDB(ldb::DB* _db = nullptr): m_db(_db) {}
~OverlayDB();
ldb::DB* db() const { return m_db.get(); }
void setDB(ldb::DB* _db, bool _clearOverlay = true);
void commit();
void rollback();
std::string lookup(h256 _h) const;
bool exists(h256 _h) const;
void kill(h256 _h);
bytes lookupAux(h256 _h) const;
private:
using MemoryDB::clear;
std::shared_ptr<ldb::DB> m_db;
ldb::ReadOptions m_readOptions;
ldb::WriteOptions m_writeOptions;
};
}