Line data    Source code

       1              : // Copyright (c) 2009-2010 Satoshi Nakamoto
       2              : // Copyright (c) 2009-2022 The Bitcoin Core developers
       3              : // Distributed under the MIT software license, see the accompanying
       4              : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       5              : 
       6              : #ifndef BITCOIN_TXDB_H
       7              : #define BITCOIN_TXDB_H
       8              : 
       9              : #include <coins.h>
      10              : #include <dbwrapper.h>
      11              : #include <kernel/cs_main.h>
      12              : #include <sync.h>
      13              : #include <util/fs.h>
      14              : 
      15              : #include <cstddef>
      16              : #include <cstdint>
      17              : #include <memory>
      18              : #include <optional>
      19              : #include <vector>
      20              : 
      21              : class COutPoint;
      22              : class uint256;
      23              : 
      24              : //! -dbbatchsize default (bytes)
      25              : static const int64_t nDefaultDbBatchSize = 16 << 20;
      26              : 
      27              : //! User-controlled performance and debug options.
      28              : struct CoinsViewOptions {
      29              :     //! Maximum database write batch size in bytes.
      30              :     size_t batch_write_bytes = nDefaultDbBatchSize;
      31              :     //! If non-zero, randomly exit when the database is flushed with (1/ratio)
      32              :     //! probability.
      33              :     int simulate_crash_ratio = 0;
      34              : };
      35              : 
      36              : /** CCoinsView backed by the coin database (chainstate/) */
      37              : class CCoinsViewDB final : public CCoinsView
      38              : {
      39              : protected:
      40              :     DBParams m_db_params;
      41              :     CoinsViewOptions m_options;
      42              :     std::unique_ptr<CDBWrapper> m_db;
      43              : public:
      44              :     explicit CCoinsViewDB(DBParams db_params, CoinsViewOptions options);
      45              : 
      46              :     std::optional<Coin> GetCoin(const COutPoint& outpoint) const override;
      47              :     bool HaveCoin(const COutPoint &outpoint) const override;
      48              :     uint256 GetBestBlock() const override;
      49              :     std::vector<uint256> GetHeadBlocks() const override;
      50              :     bool BatchWrite(CoinsViewCacheCursor& cursor, const uint256 &hashBlock) override;
      51              :     std::unique_ptr<CCoinsViewCursor> Cursor() const override;
      52              : 
      53              :     //! Whether an unsupported database format is used.
      54              :     bool NeedsUpgrade();
      55              :     size_t EstimateSize() const override;
      56              : 
      57              :     //! Dynamically alter the underlying leveldb cache size.
      58              :     void ResizeCache(size_t new_cache_size) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
      59              : 
      60              :     //! @returns filesystem path to on-disk storage or std::nullopt if in memory.
      61            8 :     std::optional<fs::path> StoragePath() { return m_db->StoragePath(); }
      62              : };
      63              : 
      64              : #endif // BITCOIN_TXDB_H