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       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_NODE_UTXO_SNAPSHOT_H
       7                 :            : #define BITCOIN_NODE_UTXO_SNAPSHOT_H
       8                 :            : 
       9                 :            : #include <kernel/cs_main.h>
      10                 :            : #include <serialize.h>
      11                 :            : #include <sync.h>
      12                 :            : #include <uint256.h>
      13                 :            : #include <util/fs.h>
      14                 :            : 
      15                 :            : #include <cstdint>
      16                 :            : #include <optional>
      17                 :            : #include <string_view>
      18                 :            : 
      19                 :            : class Chainstate;
      20                 :            : 
      21                 :            : namespace node {
      22                 :            : //! Metadata describing a serialized version of a UTXO set from which an
      23                 :            : //! assumeutxo Chainstate can be constructed.
      24                 :            : class SnapshotMetadata
      25                 :            : {
      26                 :            : public:
      27                 :            :     //! The hash of the block that reflects the tip of the chain for the
      28                 :            :     //! UTXO set contained in this snapshot.
      29                 :            :     uint256 m_base_blockhash;
      30                 :            : 
      31                 :            :     //! The number of coins in the UTXO set contained in this snapshot. Used
      32                 :            :     //! during snapshot load to estimate progress of UTXO set reconstruction.
      33                 :        421 :     uint64_t m_coins_count = 0;
      34                 :            : 
      35                 :        842 :     SnapshotMetadata() { }
      36                 :          0 :     SnapshotMetadata(
      37                 :            :         const uint256& base_blockhash,
      38                 :            :         uint64_t coins_count,
      39                 :            :         unsigned int nchaintx) :
      40                 :          0 :             m_base_blockhash(base_blockhash),
      41                 :          0 :             m_coins_count(coins_count) { }
      42                 :            : 
      43                 :       1263 :     SERIALIZE_METHODS(SnapshotMetadata, obj) { READWRITE(obj.m_base_blockhash, obj.m_coins_count); }
      44                 :            : };
      45                 :            : 
      46                 :            : //! The file in the snapshot chainstate dir which stores the base blockhash. This is
      47                 :            : //! needed to reconstruct snapshot chainstates on init.
      48                 :            : //!
      49                 :            : //! Because we only allow loading a single snapshot at a time, there will only be one
      50                 :            : //! chainstate directory with this filename present within it.
      51                 :            : const fs::path SNAPSHOT_BLOCKHASH_FILENAME{"base_blockhash"};
      52                 :            : 
      53                 :            : //! Write out the blockhash of the snapshot base block that was used to construct
      54                 :            : //! this chainstate. This value is read in during subsequent initializations and
      55                 :            : //! used to reconstruct snapshot-based chainstates.
      56                 :            : bool WriteSnapshotBaseBlockhash(Chainstate& snapshot_chainstate)
      57                 :            :     EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
      58                 :            : 
      59                 :            : //! Read the blockhash of the snapshot base block that was used to construct the
      60                 :            : //! chainstate.
      61                 :            : std::optional<uint256> ReadSnapshotBaseBlockhash(fs::path chaindir)
      62                 :            :     EXCLUSIVE_LOCKS_REQUIRED(::cs_main);
      63                 :            : 
      64                 :            : //! Suffix appended to the chainstate (leveldb) dir when created based upon
      65                 :            : //! a snapshot.
      66                 :            : constexpr std::string_view SNAPSHOT_CHAINSTATE_SUFFIX = "_snapshot";
      67                 :            : 
      68                 :            : 
      69                 :            : //! Return a path to the snapshot-based chainstate dir, if one exists.
      70                 :            : std::optional<fs::path> FindSnapshotChainstateDir(const fs::path& data_dir);
      71                 :            : 
      72                 :            : } // namespace node
      73                 :            : 
      74                 :            : #endif // BITCOIN_NODE_UTXO_SNAPSHOT_H