129 lines
4.2 KiB
C++
129 lines
4.2 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2016 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_TXDB_H
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#define BITCOIN_TXDB_H
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#include "coins.h"
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#include "dbwrapper.h"
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#include "chain.h"
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#include <map>
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#include <string>
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#include <utility>
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#include <vector>
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#include <boost/function.hpp>
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class CBlockIndex;
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class CCoinsViewDBCursor;
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class uint256;
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//! Compensate for extra memory peak (x1.5-x1.9) at flush time.
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static constexpr int DB_PEAK_USAGE_FACTOR = 2;
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//! No need to periodic flush if at least this much space still available.
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static constexpr int MAX_BLOCK_COINSDB_USAGE = 200 * DB_PEAK_USAGE_FACTOR;
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//! Always periodic flush if less than this much space still available.
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static constexpr int MIN_BLOCK_COINSDB_USAGE = 50 * DB_PEAK_USAGE_FACTOR;
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//! -dbcache default (MiB)
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static const int64_t nDefaultDbCache = 450;
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//! max. -dbcache (MiB)
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static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
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//! min. -dbcache (MiB)
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static const int64_t nMinDbCache = 4;
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//! Max memory allocated to block tree DB specific cache, if no -txindex (MiB)
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static const int64_t nMaxBlockDBCache = 2;
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//! Max memory allocated to block tree DB specific cache, if -txindex (MiB)
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// Unlike for the UTXO database, for the txindex scenario the leveldb cache make
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// a meaningful difference: https://github.com/bitcoin/bitcoin/pull/8273#issuecomment-229601991
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static const int64_t nMaxBlockDBAndTxIndexCache = 1024;
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//! Max memory allocated to coin DB specific cache (MiB)
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static const int64_t nMaxCoinsDBCache = 8;
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struct CDiskTxPos : public CDiskBlockPos
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{
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unsigned int nTxOffset; // after header
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ADD_SERIALIZE_METHODS;
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template <typename Stream, typename Operation>
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inline void SerializationOp(Stream& s, Operation ser_action) {
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READWRITE(*(CDiskBlockPos*)this);
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READWRITE(VARINT(nTxOffset));
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}
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CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
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}
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CDiskTxPos() {
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SetNull();
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}
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void SetNull() {
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CDiskBlockPos::SetNull();
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nTxOffset = 0;
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}
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};
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/** CCoinsView backed by the coin database (chainstate/) */
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class CCoinsViewDB : public CCoinsView
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{
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protected:
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CDBWrapper db;
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public:
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CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
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bool GetCoins(const uint256 &txid, CCoins &coins) const;
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bool HaveCoins(const uint256 &txid) const;
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uint256 GetBestBlock() const;
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bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
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CCoinsViewCursor *Cursor() const;
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};
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/** Specialization of CCoinsViewCursor to iterate over a CCoinsViewDB */
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class CCoinsViewDBCursor: public CCoinsViewCursor
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{
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public:
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~CCoinsViewDBCursor() {}
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bool GetKey(uint256 &key) const;
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bool GetValue(CCoins &coins) const;
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unsigned int GetValueSize() const;
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bool Valid() const;
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void Next();
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private:
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CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256 &hashBlockIn):
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CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {}
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std::unique_ptr<CDBIterator> pcursor;
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std::pair<char, uint256> keyTmp;
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friend class CCoinsViewDB;
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};
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/** Access to the block database (blocks/index/) */
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class CBlockTreeDB : public CDBWrapper
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{
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public:
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CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
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private:
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CBlockTreeDB(const CBlockTreeDB&);
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void operator=(const CBlockTreeDB&);
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public:
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bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
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bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
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bool ReadLastBlockFile(int &nFile);
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bool WriteReindexing(bool fReindex);
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bool ReadReindexing(bool &fReindex);
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bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
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bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
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bool WriteFlag(const std::string &name, bool fValue);
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bool ReadFlag(const std::string &name, bool &fValue);
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bool LoadBlockIndexGuts(boost::function<CBlockIndex*(const uint256&)> insertBlockIndex);
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};
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#endif // BITCOIN_TXDB_H
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