txdb.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2016 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef BITCOIN_TXDB_H
#define BITCOIN_TXDB_H
 
#include "coins.h"
#include "dbwrapper.h"
#include "chain.h"
 
#include <map>
#include <string>
#include <utility>
#include <vector>
 
#include <boost/function.hpp>
 
class CBlockIndex;
class CCoinsViewDBCursor;
class uint256;
 
static constexpr int DB_PEAK_USAGE_FACTOR = 2;
static constexpr int MAX_BLOCK_COINSDB_USAGE = 200 * DB_PEAK_USAGE_FACTOR;
static constexpr int MIN_BLOCK_COINSDB_USAGE = 50 * DB_PEAK_USAGE_FACTOR;
static const int64_t nDefaultDbCache = 450;
static const int64_t nMaxDbCache = sizeof(void*) > 4 ? 16384 : 1024;
static const int64_t nMinDbCache = 4;
static const int64_t nMaxBlockDBCache = 2;
// Unlike for the UTXO database, for the txindex scenario the leveldb cache make
// a meaningful difference: https://github.com/bitcoin/bitcoin/pull/8273#issuecomment-229601991
static const int64_t nMaxBlockDBAndTxIndexCache = 1024;
static const int64_t nMaxCoinsDBCache = 8;
 
struct CDiskTxPos : public CDiskBlockPos
{
    unsigned int nTxOffset; // after header
 
    ADD_SERIALIZE_METHODS;
 
    template <typename Stream, typename Operation>
    inline void SerializationOp(Stream& s, Operation ser_action) {
        READWRITE(*(CDiskBlockPos*)this);
        READWRITE(VARINT(nTxOffset));
    }
 
    CDiskTxPos(const CDiskBlockPos &blockIn, unsigned int nTxOffsetIn) : CDiskBlockPos(blockIn.nFile, blockIn.nPos), nTxOffset(nTxOffsetIn) {
    }
 
    CDiskTxPos() {
        SetNull();
    }
 
    void SetNull() {
        CDiskBlockPos::SetNull();
        nTxOffset = 0;
    }
};
 
class CCoinsViewDB : public CCoinsView
{
protected:
    CDBWrapper db;
public:
    CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
 
    bool GetCoins(const uint256 &txid, CCoins &coins) const;
    bool HaveCoins(const uint256 &txid) const;
    uint256 GetBestBlock() const;
    bool BatchWrite(CCoinsMap &mapCoins, const uint256 &hashBlock);
    CCoinsViewCursor *Cursor() const;
};
 
class CCoinsViewDBCursor: public CCoinsViewCursor
{
public:
    ~CCoinsViewDBCursor() {}
 
    bool GetKey(uint256 &key) const;
    bool GetValue(CCoins &coins) const;
    unsigned int GetValueSize() const;
 
    bool Valid() const;
    void Next();
 
private:
    CCoinsViewDBCursor(CDBIterator* pcursorIn, const uint256 &hashBlockIn):
        CCoinsViewCursor(hashBlockIn), pcursor(pcursorIn) {}
    std::unique_ptr<CDBIterator> pcursor;
    std::pair<char, uint256> keyTmp;
 
    friend class CCoinsViewDB;
};
 
class CBlockTreeDB : public CDBWrapper
{
public:
    CBlockTreeDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
private:
    CBlockTreeDB(const CBlockTreeDB&);
    void operator=(const CBlockTreeDB&);
public:
    bool WriteBatchSync(const std::vector<std::pair<int, const CBlockFileInfo*> >& fileInfo, int nLastFile, const std::vector<const CBlockIndex*>& blockinfo);
    bool ReadBlockFileInfo(int nFile, CBlockFileInfo &fileinfo);
    bool ReadLastBlockFile(int &nFile);
    bool WriteReindexing(bool fReindex);
    bool ReadReindexing(bool &fReindex);
    bool ReadTxIndex(const uint256 &txid, CDiskTxPos &pos);
    bool WriteTxIndex(const std::vector<std::pair<uint256, CDiskTxPos> > &list);
    bool WriteFlag(const std::string &name, bool fValue);
    bool ReadFlag(const std::string &name, bool &fValue);
    bool LoadBlockIndexGuts(boost::function<CBlockIndex*(const uint256&)> insertBlockIndex);
};
 
#endif // BITCOIN_TXDB_H