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OverlayDB.cpp
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152 lines (135 loc) · 3.77 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/>.
*/
#include <thread>
#include <libdevcore/db.h>
#include <libdevcore/Common.h>
#include "SHA3.h"
#include "OverlayDB.h"
#include "TrieDB.h"
namespace dev
{
OverlayDB::~OverlayDB()
{
if (m_db.use_count() == 1 && m_db.get())
clog(DBDetail) << "Closing state DB";
}
class WriteBatchNoter: public ldb::WriteBatch::Handler
{
virtual void Put(ldb::Slice const& _key, ldb::Slice const& _value) { cnote << "Put" << toHex(bytesConstRef(_key)) << "=>" << toHex(bytesConstRef(_value)); }
virtual void Delete(ldb::Slice const& _key) { cnote << "Delete" << toHex(bytesConstRef(_key)); }
};
void OverlayDB::commit()
{
if (m_db)
{
ldb::WriteBatch batch;
// cnote << "Committing nodes to disk DB:";
#if DEV_GUARDED_DB
DEV_READ_GUARDED(x_this)
#endif
{
for (auto const& i: m_main)
{
if (i.second.second)
batch.Put(ldb::Slice((char const*)i.first.data(), i.first.size), ldb::Slice(i.second.first.data(), i.second.first.size()));
// cnote << i.first << "#" << m_main[i.first].second;
}
for (auto const& i: m_aux)
if (i.second.second)
{
bytes b = i.first.asBytes();
b.push_back(255); // for aux
batch.Put(bytesConstRef(&b), bytesConstRef(&i.second.first));
}
}
for (unsigned i = 0; i < 10; ++i)
{
ldb::Status o = m_db->Write(m_writeOptions, &batch);
if (o.ok())
break;
if (i == 9)
{
cwarn << "Fail writing to state database. Bombing out.";
exit(-1);
}
cwarn << "Error writing to state database: " << o.ToString();
WriteBatchNoter n;
batch.Iterate(&n);
cwarn << "Sleeping for" << (i + 1) << "seconds, then retrying.";
std::this_thread::sleep_for(std::chrono::seconds(i + 1));
}
#if DEV_GUARDED_DB
DEV_WRITE_GUARDED(x_this)
#endif
{
m_aux.clear();
m_main.clear();
}
}
}
bytes OverlayDB::lookupAux(h256 const& _h) const
{
bytes ret = MemoryDB::lookupAux(_h);
if (!ret.empty() || !m_db)
return ret;
std::string v;
bytes b = _h.asBytes();
b.push_back(255); // for aux
m_db->Get(m_readOptions, bytesConstRef(&b), &v);
if (v.empty())
cwarn << "Aux not found: " << _h;
return asBytes(v);
}
void OverlayDB::rollback()
{
#if DEV_GUARDED_DB
WriteGuard l(x_this);
#endif
m_main.clear();
}
std::string OverlayDB::lookup(h256 const& _h) const
{
std::string ret = MemoryDB::lookup(_h);
if (ret.empty() && m_db)
m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
return ret;
}
bool OverlayDB::exists(h256 const& _h) const
{
if (MemoryDB::exists(_h))
return true;
std::string ret;
if (m_db)
m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
return !ret.empty();
}
void OverlayDB::kill(h256 const& _h)
{
#if ETH_PARANOIA || 1
if (!MemoryDB::kill(_h))
{
std::string ret;
if (m_db)
m_db->Get(m_readOptions, ldb::Slice((char const*)_h.data(), 32), &ret);
// No point node ref decreasing for EmptyTrie since we never bother incrementing it in the first place for
// empty storage tries.
if (ret.empty() && _h != EmptyTrie)
cnote << "Decreasing DB node ref count below zero with no DB node. Probably have a corrupt Trie." << _h;
// TODO: for 1.1: ref-counted triedb.
}
#else
MemoryDB::kill(_h);
#endif
}
}