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100 lines
2.3 KiB
100 lines
2.3 KiB
11 years ago
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/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file TrieDB.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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11 years ago
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#include <libethential/Common.h>
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11 years ago
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#include "OverlayDB.h"
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using namespace std;
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using namespace eth;
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namespace eth
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{
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OverlayDB::~OverlayDB()
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{
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if (m_db.use_count() == 1 && m_db.get())
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cnote << "Closing state DB";
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}
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void OverlayDB::setDB(ldb::DB* _db, bool _clearOverlay)
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{
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m_db = std::shared_ptr<ldb::DB>(_db);
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if (_clearOverlay)
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m_over.clear();
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}
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void OverlayDB::commit()
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{
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if (m_db)
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{
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// cnote << "Committing nodes to disk DB:";
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for (auto const& i: m_over)
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{
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// cnote << i.first << "#" << m_refCount[i.first];
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if (m_refCount[i.first])
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m_db->Put(m_writeOptions, ldb::Slice((char const*)i.first.data(), i.first.size), ldb::Slice(i.second.data(), i.second.size()));
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}
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m_over.clear();
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m_refCount.clear();
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}
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}
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void OverlayDB::rollback()
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{
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m_over.clear();
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m_refCount.clear();
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}
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std::string OverlayDB::lookup(h256 _h) const
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{
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std::string ret = MemoryDB::lookup(_h);
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if (ret.empty() && m_db)
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m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
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return ret;
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}
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bool OverlayDB::exists(h256 _h) const
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{
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if (MemoryDB::exists(_h))
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return true;
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std::string ret;
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if (m_db)
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m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
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return !ret.empty();
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}
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void OverlayDB::kill(h256 _h)
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{
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#if ETH_PARANOIA
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if (!MemoryDB::kill(_h))
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{
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std::string ret;
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if (m_db)
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m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
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if (ret.empty())
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cnote << "Decreasing DB node ref count below zero with no DB node. Probably have a corrupt Trie." << _h.abridged();
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}
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#else
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MemoryDB::kill(_h);
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#endif
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}
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}
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