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assumeutxo: Add documentation on dumptxoutset serialization format

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Fabian Jahr 2024-03-10 16:08:11 +01:00
parent c14ed7f384
commit 4d8e5edbaa
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2 changed files with 13 additions and 0 deletions
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7
src/rpc/blockchain.cpp
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@ -2702,6 +2702,13 @@ UniValue CreateUTXOSnapshot(
size_t written_coins_count{0}; size_t written_coins_count{0};
std::vector<std::pair<uint32_t, Coin>> coins; std::vector<std::pair<uint32_t, Coin>> coins;
// To reduce space the serialization format of the snapshot avoids
// duplication of tx hashes. The code takes advantage of the guarantee by
// leveldb that keys are lexicographically sorted.
// In the coins vector we collect all coins that belong to a certain tx hash
// (key.hash) and when we have them all (key.hash != last_hash) we write
// them to file using the below lambda function.
// See also https://github.com/bitcoin/bitcoin/issues/25675
auto write_coins_to_file = [&](AutoFile& afile, const Txid& last_hash, const std::vector<std::pair<uint32_t, Coin>>& coins, size_t& written_coins_count) { auto write_coins_to_file = [&](AutoFile& afile, const Txid& last_hash, const std::vector<std::pair<uint32_t, Coin>>& coins, size_t& written_coins_count) {
afile << last_hash; afile << last_hash;
WriteCompactSize(afile, coins.size()); WriteCompactSize(afile, coins.size());

6
src/validation.h
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@ -885,6 +885,12 @@ private:
CBlockIndex* m_best_invalid GUARDED_BY(::cs_main){nullptr}; CBlockIndex* m_best_invalid GUARDED_BY(::cs_main){nullptr};
//! Internal helper for ActivateSnapshot(). //! Internal helper for ActivateSnapshot().
//!
//! De-serialization of a snapshot that is created with
//! CreateUTXOSnapshot() in rpc/blockchain.cpp.
//! To reduce space the serialization format of the snapshot avoids
//! duplication of tx hashes. The code takes advantage of the guarantee by
//! leveldb that keys are lexicographically sorted.
[[nodiscard]] bool PopulateAndValidateSnapshot( [[nodiscard]] bool PopulateAndValidateSnapshot(
Chainstate& snapshot_chainstate, Chainstate& snapshot_chainstate,
AutoFile& coins_file, AutoFile& coins_file,