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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.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include <libdevcore/Common.h>
#include "MemoryDB.h"
using namespace std;
using namespace dev;
namespace dev
{
std::map<h256, std::string> MemoryDB::get() const
{
if (!m_enforceRefs)
return m_over;
std::map<h256, std::string> ret;
for (auto const& i: m_refCount)
if (i.second)
ret.insert(*m_over.find(i.first));
return ret;
}
std::string MemoryDB::lookup(h256 _h) const
{
auto it = m_over.find(_h);
if (it != m_over.end())
{
if (!m_enforceRefs || (m_refCount.count(it->first) && m_refCount.at(it->first)))
return it->second;
// else if (m_enforceRefs && m_refCount.count(it->first) && !m_refCount.at(it->first))
// cnote << "Lookup required for value with no refs. Let's hope it's in the DB." << _h.abridged();
}
return std::string();
}
bool MemoryDB::exists(h256 _h) const
{
auto it = m_over.find(_h);
if (it != m_over.end() && (!m_enforceRefs || (m_refCount.count(it->first) && m_refCount.at(it->first))))
return true;
return false;
}
void MemoryDB::insert(h256 _h, bytesConstRef _v)
{
m_over[_h] = _v.toString();
m_refCount[_h]++;
#if ETH_PARANOIA
dbdebug << "INST" << _h.abridged() << "=>" << m_refCount[_h];
#endif
}
bool MemoryDB::kill(h256 _h)
{
if (m_refCount.count(_h))
{
if (m_refCount[_h] > 0)
--m_refCount[_h];
#if ETH_PARANOIA
else
{
// If we get to this point, then there was probably a node in the level DB which we need to remove and which we have previously
// used as part of the memory-based MemoryDB. Nothing to be worried about *as long as the node exists in the DB*.
dbdebug << "NOKILL-WAS" << _h.abridged();
return false;
}
dbdebug << "KILL" << _h.abridged() << "=>" << m_refCount[_h];
return true;
}
else
{
dbdebug << "NOKILL" << _h.abridged();
return false;
}
#else
}
return true;
#endif
}
void MemoryDB::purge()
{
for (auto const& i: m_refCount)
if (!i.second)
m_over.erase(i.first);
}
set<h256> MemoryDB::keys() const
{
set<h256> ret;
for (auto const& i: m_refCount)
if (i.second)
ret.insert(i.first);
return ret;
}
}