MemoryDB.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 <unordered_map>
#include "Common.h"
#include "Guards.h"
#include "FixedHash.h"
#include "Log.h"
#include "RLP.h"
#include "SHA3.h"

namespace dev
{

struct DBChannel: public LogChannel  { static const char* name(); static const int verbosity = 18; };
struct DBWarn: public LogChannel  { static const char* name(); static const int verbosity = 1; };

#define dbdebug clog(DBChannel)
#define dbwarn clog(DBWarn)

class MemoryDB
{
        friend class EnforceRefs;

public:
        MemoryDB() {}
        MemoryDB(MemoryDB const& _c) { operator=(_c); }

        MemoryDB& operator=(MemoryDB const& _c);

        void clear() { m_main.clear(); m_aux.clear(); } // WARNING !!!! didn't originally clear m_refCount!!!
        std::unordered_map<h256, std::string> get() const;

        std::string lookup(h256 const& _h) const;
        bool exists(h256 const& _h) const;
        void insert(h256 const& _h, bytesConstRef _v);
        bool kill(h256 const& _h);
        void purge();

        bytes lookupAux(h256 const& _h) const;
        void removeAux(h256 const& _h);
        void insertAux(h256 const& _h, bytesConstRef _v);

        h256Hash keys() const;

protected:
#if DEV_GUARDED_DB
        mutable SharedMutex x_this;
#endif
        std::unordered_map<h256, std::pair<std::string, unsigned>> m_main;
        std::unordered_map<h256, std::pair<bytes, bool>> m_aux;

        mutable bool m_enforceRefs = false;
};

class EnforceRefs
{
public:
        EnforceRefs(MemoryDB const& _o, bool _r): m_o(_o), m_r(_o.m_enforceRefs) { _o.m_enforceRefs = _r; }
        ~EnforceRefs() { m_o.m_enforceRefs = m_r; }

private:
        MemoryDB const& m_o;
        bool m_r;
};

inline std::ostream& operator<<(std::ostream& _out, MemoryDB const& _m)
{
        for (auto const& i: _m.get())
        {
                _out << i.first << ": ";
                _out << RLP(i.second);
                _out << " " << toHex(i.second);
                _out << std::endl;
        }
        return _out;
}

}