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MemoryDB.cpp
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183 lines (165 loc) · 3.86 KB
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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
{
const char* DBChannel::name() { return "TDB"; }
const char* DBWarn::name() { return "TDB"; }
std::unordered_map<h256, std::string> MemoryDB::get() const
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
std::unordered_map<h256, std::string> ret;
for (auto const& i: m_main)
if (!m_enforceRefs || i.second.second > 0)
ret.insert(make_pair(i.first, i.second.first));
return ret;
}
MemoryDB& MemoryDB::operator=(MemoryDB const& _c)
{
if (this == &_c)
return *this;
#if DEV_GUARDED_DB
ReadGuard l(_c.x_this);
WriteGuard l2(x_this);
#endif
m_main = _c.m_main;
m_aux = _c.m_aux;
return *this;
}
std::string MemoryDB::lookup(h256 const& _h) const
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
auto it = m_main.find(_h);
if (it != m_main.end())
{
if (!m_enforceRefs || it->second.second > 0)
return it->second.first;
else
cwarn << "Lookup required for value with refcount == 0. This is probably a critical trie issue" << _h;
}
return std::string();
}
bool MemoryDB::exists(h256 const& _h) const
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
auto it = m_main.find(_h);
if (it != m_main.end() && (!m_enforceRefs || it->second.second > 0))
return true;
return false;
}
void MemoryDB::insert(h256 const& _h, bytesConstRef _v)
{
#if DEV_GUARDED_DB
WriteGuard l(x_this);
#endif
auto it = m_main.find(_h);
if (it != m_main.end())
{
it->second.first = _v.toString();
it->second.second++;
}
else
m_main[_h] = make_pair(_v.toString(), 1);
#if ETH_PARANOIA
dbdebug << "INST" << _h << "=>" << m_main[_h].second;
#endif
}
bool MemoryDB::kill(h256 const& _h)
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
if (m_main.count(_h))
{
if (m_main[_h].second > 0)
{
m_main[_h].second--;
return true;
}
#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;
}
dbdebug << "KILL" << _h << "=>" << m_main[_h].second;
}
else
{
dbdebug << "NOKILL" << _h;
#endif
}
return false;
}
bytes MemoryDB::lookupAux(h256 const& _h) const
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
auto it = m_aux.find(_h);
if (it != m_aux.end() && (!m_enforceRefs || it->second.second))
return it->second.first;
return bytes();
}
void MemoryDB::removeAux(h256 const& _h)
{
#if DEV_GUARDED_DB
WriteGuard l(x_this);
#endif
m_aux[_h].second = false;
}
void MemoryDB::insertAux(h256 const& _h, bytesConstRef _v)
{
#if DEV_GUARDED_DB
WriteGuard l(x_this);
#endif
m_aux[_h] = make_pair(_v.toBytes(), true);
}
void MemoryDB::purge()
{
#if DEV_GUARDED_DB
WriteGuard l(x_this);
#endif
for (auto it = m_main.begin(); it != m_main.end(); )
if (it->second.second)
++it;
else
it = m_main.erase(it);
}
h256Hash MemoryDB::keys() const
{
#if DEV_GUARDED_DB
ReadGuard l(x_this);
#endif
h256Hash ret;
for (auto const& i: m_main)
if (i.second.second)
ret.insert(i.first);
return ret;
}
}