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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2014 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "txdb.h"
#include "pow.h"
#include "uint256.h"
#include <stdint.h>
#include <boost/thread.hpp>
using namespace std;
void static BatchWriteCoins(CLevelDBBatch &batch, const uint256 &hash, const CCoins &coins) {
if (coins.IsPruned())
batch.Erase(make_pair('c', hash));
else
batch.Write(make_pair('c', hash), coins);
}
void static BatchWriteHashBestChain(CLevelDBBatch &batch, const uint256 &hash) {
batch.Write('B', hash);
}
CCoinsViewDB::CCoinsViewDB(size_t nCacheSize, bool fMemory, bool fWipe) : db(GetDataDir() / "chainstate", nCacheSize, fMemory, fWipe) {
}
bool CCoinsViewDB::GetCoins(const uint256 &txid, CCoins &coins) const {
return db.Read(make_pair('c', txid), coins);
}
bool CCoinsViewDB::HaveCoins(const uint256 &txid) const {
return db.Exists(make_pair('c', txid));
}
uint256 CCoinsViewDB::GetBestBlock() const {
uint256 hashBestChain;
if (!db.Read('B', hashBestChain))
return uint256(0);
return hashBestChain;
}
bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) {
CLevelDBBatch batch;
size_t count = 0;
size_t changed = 0;
for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) {
if (it->second.flags & CCoinsCacheEntry::DIRTY) {
BatchWriteCoins(batch, it->first, it->second.coins);
changed++;
}
count++;
CCoinsMap::iterator itOld = it++;
mapCoins.erase(itOld);
}
if (hashBlock != uint256(0))
BatchWriteHashBestChain(batch, hashBlock);
LogPrint("coindb", "Committing %u changed transactions (out of %u) to coin database...\n", (unsigned int)changed, (unsigned int)count);
return db.WriteBatch(batch);
}
CBlockTreeDB::CBlockTreeDB(size_t nCacheSize, bool fMemory, bool fWipe) : CLevelDBWrapper(GetDataDir() / "blocks" / "index", nCacheSize, fMemory, fWipe) {
}
bool CBlockTreeDB::WriteBlockIndex(const CDiskBlockIndex& blockindex)
{
return Write(make_pair('b', blockindex.GetBlockHash()), blockindex);
}
bool CBlockTreeDB::WriteBlockFileInfo(int nFile, const CBlockFileInfo &info) {
return Write(make_pair('f', nFile), info);
}
bool CBlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo &info) {
return Read(make_pair('f', nFile), info);
}
bool CBlockTreeDB::WriteLastBlockFile(int nFile) {
return Write('l', nFile);
}
bool CBlockTreeDB::WriteReindexing(bool fReindexing) {
if (fReindexing)
return Write('R', '1');
else
return Erase('R');
}
bool CBlockTreeDB::ReadReindexing(bool &fReindexing) {
fReindexing = Exists('R');
return true;
}
bool CBlockTreeDB::ReadLastBlockFile(int &nFile) {
return Read('l', nFile);
}
bool CCoinsViewDB::GetStats(CCoinsStats &stats) const {
/* It seems that there are no "const iterators" for LevelDB. Since we
only need read operations on it, use a const-cast to get around
that restriction. */
boost::scoped_ptr<leveldb::Iterator> pcursor(const_cast<CLevelDBWrapper*>(&db)->NewIterator());
pcursor->SeekToFirst();
CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
stats.hashBlock = GetBestBlock();
ss << stats.hashBlock;
CAmount nTotalAmount = 0;
while (pcursor->Valid()) {
boost::this_thread::interruption_point();
try {
leveldb::Slice slKey = pcursor->key();
CDataStream ssKey(slKey.data(), slKey.data()+slKey.size(), SER_DISK, CLIENT_VERSION);
char chType;
ssKey >> chType;
if (chType == 'c') {
leveldb::Slice slValue = pcursor->value();
CDataStream ssValue(slValue.data(), slValue.data()+slValue.size(), SER_DISK, CLIENT_VERSION);
CCoins coins;
ssValue >> coins;
uint256 txhash;
ssKey >> txhash;
ss << txhash;
ss << VARINT(coins.nVersion);
ss << (coins.fCoinBase ? 'c' : 'n');
ss << VARINT(coins.nHeight);
stats.nTransactions++;
for (unsigned int i=0; i<coins.vout.size(); i++) {
const CTxOut &out = coins.vout[i];
if (!out.IsNull()) {
stats.nTransactionOutputs++;
ss << VARINT(i+1);
ss << out;
nTotalAmount += out.nValue;
}
}
stats.nSerializedSize += 32 + slValue.size();
ss << VARINT(0);
}
pcursor->Next();
} catch (std::exception &e) {
return error("%s : Deserialize or I/O error - %s", __func__, e.what());
}
}
stats.nHeight = mapBlockIndex.find(GetBestBlock())->second->nHeight;
stats.hashSerialized = ss.GetHash();
stats.nTotalAmount = nTotalAmount;
return true;
}
bool CBlockTreeDB::ReadTxIndex(const uint256 &txid, CDiskTxPos &pos) {
return Read(make_pair('t', txid), pos);
}
bool CBlockTreeDB::WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> >&vect) {
CLevelDBBatch batch;
for (std::vector<std::pair<uint256,CDiskTxPos> >::const_iterator it=vect.begin(); it!=vect.end(); it++)
batch.Write(make_pair('t', it->first), it->second);
return WriteBatch(batch);
}
bool CBlockTreeDB::WriteFlag(const std::string &name, bool fValue) {
return Write(std::make_pair('F', name), fValue ? '1' : '0');
}
bool CBlockTreeDB::ReadFlag(const std::string &name, bool &fValue) {
char ch;
if (!Read(std::make_pair('F', name), ch))
return false;
fValue = ch == '1';
return true;
}
bool CBlockTreeDB::LoadBlockIndexGuts()
{
boost::scoped_ptr<leveldb::Iterator> pcursor(NewIterator());
CDataStream ssKeySet(SER_DISK, CLIENT_VERSION);
ssKeySet << make_pair('b', uint256(0));
pcursor->Seek(ssKeySet.str());
// Load mapBlockIndex
while (pcursor->Valid()) {
boost::this_thread::interruption_point();
try {
leveldb::Slice slKey = pcursor->key();
CDataStream ssKey(slKey.data(), slKey.data()+slKey.size(), SER_DISK, CLIENT_VERSION);
char chType;
ssKey >> chType;
if (chType == 'b') {
leveldb::Slice slValue = pcursor->value();
CDataStream ssValue(slValue.data(), slValue.data()+slValue.size(), SER_DISK, CLIENT_VERSION);
CDiskBlockIndex diskindex;
ssValue >> diskindex;
// Construct block index object
CBlockIndex* pindexNew = InsertBlockIndex(diskindex.GetBlockHash());
pindexNew->pprev = InsertBlockIndex(diskindex.hashPrev);
pindexNew->nHeight = diskindex.nHeight;
pindexNew->nFile = diskindex.nFile;
pindexNew->nDataPos = diskindex.nDataPos;
pindexNew->nUndoPos = diskindex.nUndoPos;
pindexNew->nVersion = diskindex.nVersion;
pindexNew->hashMerkleRoot = diskindex.hashMerkleRoot;
pindexNew->nTime = diskindex.nTime;
pindexNew->nBits = diskindex.nBits;
pindexNew->nNonce = diskindex.nNonce;
pindexNew->nStatus = diskindex.nStatus;
pindexNew->nTx = diskindex.nTx;
if (!CheckProofOfWork(pindexNew->GetBlockHash(), pindexNew->nBits))
return error("LoadBlockIndex() : CheckProofOfWork failed: %s", pindexNew->ToString());
pcursor->Next();
} else {
break; // if shutdown requested or finished loading block index
}
} catch (std::exception &e) {
return error("%s : Deserialize or I/O error - %s", __func__, e.what());
}
}
return true;
}
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