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Diffstat (limited to 'src/txdb.cpp')
| -rw-r--r-- | src/txdb.cpp | 215 |
1 files changed, 215 insertions, 0 deletions
diff --git a/src/txdb.cpp b/src/txdb.cpp new file mode 100644 index 000000000..4f11c7b95 --- /dev/null +++ b/src/txdb.cpp @@ -0,0 +1,215 @@ +// Copyright (c) 2009-2010 Satoshi Nakamoto +// Copyright (c) 2009-2015 The Bitcoin Core developers +// Distributed under the MIT software license, see the accompanying +// file COPYING or http://www.opensource.org/licenses/mit-license.php. + +#include "txdb.h" + +#include "chainparams.h" +#include "hash.h" +#include "pow.h" +#include "uint256.h" + +#include <stdint.h> + +#include <boost/thread.hpp> + +using namespace std; + +static const char DB_COINS = 'c'; +static const char DB_BLOCK_FILES = 'f'; +static const char DB_TXINDEX = 't'; +static const char DB_BLOCK_INDEX = 'b'; + +static const char DB_BEST_BLOCK = 'B'; +static const char DB_FLAG = 'F'; +static const char DB_REINDEX_FLAG = 'R'; +static const char DB_LAST_BLOCK = 'l'; + + +CCoinsViewDB::CCoinsViewDB(size_t nCacheSize, bool fMemory, bool fWipe) : db(GetDataDir() / "chainstate", nCacheSize, fMemory, fWipe, true) +{ +} + +bool CCoinsViewDB::GetCoins(const uint256 &txid, CCoins &coins) const { + return db.Read(make_pair(DB_COINS, txid), coins); +} + +bool CCoinsViewDB::HaveCoins(const uint256 &txid) const { + return db.Exists(make_pair(DB_COINS, txid)); +} + +uint256 CCoinsViewDB::GetBestBlock() const { + uint256 hashBestChain; + if (!db.Read(DB_BEST_BLOCK, hashBestChain)) + return uint256(); + return hashBestChain; +} + +bool CCoinsViewDB::BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock) { + CDBBatch batch(db); + size_t count = 0; + size_t changed = 0; + for (CCoinsMap::iterator it = mapCoins.begin(); it != mapCoins.end();) { + if (it->second.flags & CCoinsCacheEntry::DIRTY) { + if (it->second.coins.IsPruned()) + batch.Erase(make_pair(DB_COINS, it->first)); + else + batch.Write(make_pair(DB_COINS, it->first), it->second.coins); + changed++; + } + count++; + CCoinsMap::iterator itOld = it++; + mapCoins.erase(itOld); + } + if (!hashBlock.IsNull()) + batch.Write(DB_BEST_BLOCK, 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) : CDBWrapper(GetDataDir() / "blocks" / "index", nCacheSize, fMemory, fWipe) { +} + +bool CBlockTreeDB::ReadBlockFileInfo(int nFile, CBlockFileInfo &info) { + return Read(make_pair(DB_BLOCK_FILES, nFile), info); +} + +bool CBlockTreeDB::WriteReindexing(bool fReindexing) { + if (fReindexing) + return Write(DB_REINDEX_FLAG, '1'); + else + return Erase(DB_REINDEX_FLAG); +} + +bool CBlockTreeDB::ReadReindexing(bool &fReindexing) { + fReindexing = Exists(DB_REINDEX_FLAG); + return true; +} + +bool CBlockTreeDB::ReadLastBlockFile(int &nFile) { + return Read(DB_LAST_BLOCK, nFile); +} + +CCoinsViewCursor *CCoinsViewDB::Cursor() const +{ + CCoinsViewDBCursor *i = new CCoinsViewDBCursor(const_cast<CDBWrapper*>(&db)->NewIterator(), GetBestBlock()); + /* 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. */ + i->pcursor->Seek(DB_COINS); + // Cache key of first record + i->pcursor->GetKey(i->keyTmp); + return i; +} + +bool CCoinsViewDBCursor::GetKey(uint256 &key) const +{ + // Return cached key + if (keyTmp.first == DB_COINS) { + key = keyTmp.second; + return true; + } + return false; +} + +bool CCoinsViewDBCursor::GetValue(CCoins &coins) const +{ + return pcursor->GetValue(coins); +} + +unsigned int CCoinsViewDBCursor::GetValueSize() const +{ + return pcursor->GetValueSize(); +} + +bool CCoinsViewDBCursor::Valid() const +{ + return keyTmp.first == DB_COINS; +} + +void CCoinsViewDBCursor::Next() +{ + pcursor->Next(); + if (!pcursor->Valid() || !pcursor->GetKey(keyTmp)) + keyTmp.first = 0; // Invalidate cached key after last record so that Valid() and GetKey() return false +} + +bool CBlockTreeDB::WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo) { + CDBBatch batch(*this); + for (std::vector<std::pair<int, const CBlockFileInfo*> >::const_iterator it=fileInfo.begin(); it != fileInfo.end(); it++) { + batch.Write(make_pair(DB_BLOCK_FILES, it->first), *it->second); + } + batch.Write(DB_LAST_BLOCK, nLastFile); + for (std::vector<const CBlockIndex*>::const_iterator it=blockinfo.begin(); it != blockinfo.end(); it++) { + batch.Write(make_pair(DB_BLOCK_INDEX, (*it)->GetBlockHash()), CDiskBlockIndex(*it)); + } + return WriteBatch(batch, true); +} + +bool CBlockTreeDB::ReadTxIndex(const uint256 &txid, CDiskTxPos &pos) { + return Read(make_pair(DB_TXINDEX, txid), pos); +} + +bool CBlockTreeDB::WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> >&vect) { + CDBBatch batch(*this); + for (std::vector<std::pair<uint256,CDiskTxPos> >::const_iterator it=vect.begin(); it!=vect.end(); it++) + batch.Write(make_pair(DB_TXINDEX, it->first), it->second); + return WriteBatch(batch); +} + +bool CBlockTreeDB::WriteFlag(const std::string &name, bool fValue) { + return Write(std::make_pair(DB_FLAG, name), fValue ? '1' : '0'); +} + +bool CBlockTreeDB::ReadFlag(const std::string &name, bool &fValue) { + char ch; + if (!Read(std::make_pair(DB_FLAG, name), ch)) + return false; + fValue = ch == '1'; + return true; +} + +bool CBlockTreeDB::LoadBlockIndexGuts(boost::function<CBlockIndex*(const uint256&)> insertBlockIndex) +{ + std::unique_ptr<CDBIterator> pcursor(NewIterator()); + + pcursor->Seek(make_pair(DB_BLOCK_INDEX, uint256())); + + // Load mapBlockIndex + while (pcursor->Valid()) { + boost::this_thread::interruption_point(); + std::pair<char, uint256> key; + if (pcursor->GetKey(key) && key.first == DB_BLOCK_INDEX) { + CDiskBlockIndex diskindex; + if (pcursor->GetValue(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, Params().GetConsensus())) + return error("LoadBlockIndex(): CheckProofOfWork failed: %s", pindexNew->ToString()); + + pcursor->Next(); + } else { + return error("LoadBlockIndex() : failed to read value"); + } + } else { + break; + } + } + + return true; +} |