txdb.h

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 <kernel/cs_main.h>
#include <sync.h>
#include <util/fs.h>
 
#include <cstddef>
#include <cstdint>
#include <memory>
#include <optional>
#include <vector>
 
class COutPoint;
class uint256;
 
static const int64_t nDefaultDbCache = 450;
static const int64_t nDefaultDbBatchSize = 16 << 20;
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 nMaxTxIndexCache = 1024;
static const int64_t max_filter_index_cache = 1024;
static const int64_t nMaxCoinsDBCache = 8;
 
struct CoinsViewOptions {
    size_t batch_write_bytes = nDefaultDbBatchSize;
    int simulate_crash_ratio = 0;
};
 
class CCoinsViewDB final : public CCoinsView
{
protected:
    DBParams m_db_params;
    CoinsViewOptions m_options;
    std::unique_ptr<CDBWrapper> m_db;
public:
    explicit CCoinsViewDB(DBParams db_params, CoinsViewOptions options);
 
    std::optional<Coin> GetCoin(const COutPoint& outpoint) const override;
    bool HaveCoin(const COutPoint &outpoint) const override;
    uint256 GetBestBlock() const override;
    std::vector<uint256> GetHeadBlocks() const override;
    bool BatchWrite(CoinsViewCacheCursor& cursor, const uint256 &hashBlock) override;
    std::unique_ptr<CCoinsViewCursor> Cursor() const override;
 
    bool NeedsUpgrade();
    size_t EstimateSize() const override;
 
    void ResizeCache(size_t new_cache_size) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
 
    std::optional<fs::path> StoragePath() { return m_db->StoragePath(); }
};
 
#endif // BITCOIN_TXDB_H