fuzz coverage

Coverage Report

Created: 2025-10-29 15:27

/Users/eugenesiegel/btc/bitcoin/src/node/utxo_snapshot.cpp
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// Copyright (c) 2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#include <node/utxo_snapshot.h>
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#include <logging.h>
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#include <streams.h>
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#include <sync.h>
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#include <tinyformat.h>
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#include <txdb.h>
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#include <uint256.h>
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#include <util/fs.h>
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#include <validation.h>
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#include <cassert>
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#include <cstdio>
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#include <optional>
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#include <string>
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namespace node {
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bool WriteSnapshotBaseBlockhash(Chainstate& snapshot_chainstate)
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{
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    AssertLockHeld(::cs_main);
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#define AssertLockHeld(cs) AssertLockHeldInternal(#cs, __FILE__, __LINE__, &cs)
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    assert(snapshot_chainstate.m_from_snapshot_blockhash);
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    const std::optional<fs::path> chaindir = snapshot_chainstate.CoinsDB().StoragePath();
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    assert(chaindir); // Sanity check that chainstate isn't in-memory.
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    const fs::path write_to = *chaindir / node::SNAPSHOT_BLOCKHASH_FILENAME;
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    FILE* file{fsbridge::fopen(write_to, "wb")};
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    AutoFile afile{file};
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    if (afile.IsNull()) {
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        LogPrintf("[snapshot] failed to open base blockhash file for writing: %s\n",
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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                  fs::PathToString(write_to));
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        return false;
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    }
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    afile << *snapshot_chainstate.m_from_snapshot_blockhash;
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    if (afile.fclose() != 0) {
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        LogPrintf("[snapshot] failed to close base blockhash file %s after writing\n",
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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                  fs::PathToString(write_to));
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        return false;
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    }
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    return true;
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}
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std::optional<uint256> ReadSnapshotBaseBlockhash(fs::path chaindir)
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{
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    if (!fs::exists(chaindir)) {
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        LogPrintf("[snapshot] cannot read base blockhash: no chainstate dir "
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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            "exists at path %s\n", fs::PathToString(chaindir));
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        return std::nullopt;
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    }
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    const fs::path read_from = chaindir / node::SNAPSHOT_BLOCKHASH_FILENAME;
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    const std::string read_from_str = fs::PathToString(read_from);
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    if (!fs::exists(read_from)) {
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        LogPrintf("[snapshot] snapshot chainstate dir is malformed! no base blockhash file "
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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            "exists at path %s. Try deleting %s and calling loadtxoutset again?\n",
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            fs::PathToString(chaindir), read_from_str);
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        return std::nullopt;
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    }
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    uint256 base_blockhash;
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    FILE* file{fsbridge::fopen(read_from, "rb")};
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    AutoFile afile{file};
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    if (afile.IsNull()) {
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        LogPrintf("[snapshot] failed to open base blockhash file for reading: %s\n",
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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            read_from_str);
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        return std::nullopt;
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    }
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    afile >> base_blockhash;
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    int64_t position = afile.tell();
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    afile.seek(0, SEEK_END);
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    if (position != afile.tell()) {
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        LogPrintf("[snapshot] warning: unexpected trailing data in %s\n", read_from_str);
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#define LogPrintf(...) LogInfo(__VA_ARGS__)
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#define LogInfo(...) LogPrintLevel_(BCLog::LogFlags::ALL, BCLog::Level::Info, /*should_ratelimit=*/true, __VA_ARGS__)
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#define LogPrintLevel_(category, level, should_ratelimit, ...) LogPrintFormatInternal(std::source_location::current(), category, level, should_ratelimit, __VA_ARGS__)
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    }
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    return base_blockhash;
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}
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std::optional<fs::path> FindSnapshotChainstateDir(const fs::path& data_dir)
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{
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    fs::path possible_dir =
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        data_dir / fs::u8path(strprintf("chainstate%s", SNAPSHOT_CHAINSTATE_SUFFIX));
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#define strprintf tfm::format
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    if (fs::exists(possible_dir)) {
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        return possible_dir;
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    }
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    return std::nullopt;
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}
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} // namespace node