OverlayDB.h

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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/>.
*/
#pragma once

#include <memory>
#include <libdevcore/db.h>
#include <libdevcore/Common.h>
#include <libdevcore/Log.h>
#include <libdevcore/MemoryDB.h>

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 commit();
        void rollback();

        std::string lookup(h256 const& _h) const;
        bool exists(h256 const& _h) const;
        void kill(h256 const& _h);
        bool deepkill(h256 const& _h);

        bytes lookupAux(h256 const& _h) const;

private:
        using MemoryDB::clear;

        std::shared_ptr<ldb::DB> m_db;

        ldb::ReadOptions m_readOptions;
        ldb::WriteOptions m_writeOptions;
};

}