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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 MemoryDB.h
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#pragma once
#include <map>
#include <libdevcore/Common.h>
#include <libdevcore/FixedHash.h>
#include <libdevcore/Log.h>
#include <libdevcore/RLP.h>
#include "SHA3.h"
namespace dev
{
struct DBChannel: public LogChannel { static const char* name() { return "TDB"; } static const int verbosity = 18; };
#define dbdebug clog(DBChannel)
class MemoryDB
{
friend class EnforceRefs;
public:
MemoryDB() {}
void clear() { m_over.clear(); }
std::map<h256, std::string> get() const;
std::string lookup(h256 _h) const;
bool exists(h256 _h) const;
void insert(h256 _h, bytesConstRef _v);
bool kill(h256 _h);
void purge();
bytes lookupAux(h256 _h) const { auto h = aux(_h); return m_aux.count(h) ? m_aux.at(h) : bytes(); }
void removeAux(h256 _h) { m_auxActive.erase(aux(_h)); }
void insertAux(h256 _h, bytesConstRef _v) { auto h = aux(_h); m_auxActive.insert(h); m_aux[h] = _v.toBytes(); }
std::set<h256> keys() const;
protected:
static h256 aux(h256 _k) { return h256(sha3(_k).ref().cropped(0, 24), h256::AlignLeft); }
std::map<h256, std::string> m_over;
std::map<h256, unsigned> m_refCount;
std::set<h256> m_auxActive;
std::map<h256, bytes> 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 i: _m.get())
{
_out << i.first << ": ";
_out << RLP(i.second);
_out << " " << toHex(i.second);
_out << std::endl;
}
return _out;
}
}