Method PopulateAndValidateSnapshot

src/validation.cpp:5301–5495

}

bool ChainstateManager::PopulateAndValidateSnapshot(
    CChainState& snapshot_chainstate,
    CAutoFile& coins_file,
    const SnapshotMetadata& metadata)
{
    // It's okay to release cs_main before we're done using `coins_cache` because we know
    // that nothing else will be referencing the newly created snapshot_chainstate yet.
    CCoinsViewCache& coins_cache = *WITH_LOCK(::cs_main, return &snapshot_chainstate.CoinsTip());

    uint256 base_blockhash = metadata.m_base_blockhash;

    CBlockIndex* snapshot_start_block = WITH_LOCK(::cs_main, return m_blockman.LookupBlockIndex(base_blockhash));

    if (!snapshot_start_block) {
        // Needed for GetUTXOStats and ExpectedAssumeutxo to determine the height and to avoid a crash when base_blockhash.IsNull()
        LogPrintf("[snapshot] Did not find snapshot start blockheader %s\n",
                  base_blockhash.ToString());
        return false;
    }

    int base_height = snapshot_start_block->nHeight;
    auto maybe_au_data = ExpectedAssumeutxo(base_height, ::Params());

    if (!maybe_au_data) {
        LogPrintf("[snapshot] assumeutxo height in snapshot metadata not recognized " /* Continued */
                  "(%d) - refusing to load snapshot\n", base_height);
        return false;
    }

    const AssumeutxoData& au_data = *maybe_au_data;

    COutPoint outpoint;
    Coin coin;
    const uint64_t coins_count = metadata.m_coins_count;
    uint64_t coins_left = metadata.m_coins_count;

    LogPrintf("[snapshot] loading coins from snapshot %s\n", base_blockhash.ToString());
    int64_t coins_processed{0};

    while (coins_left > 0) {
        try {
            coins_file >> outpoint;
            coins_file >> coin;
        } catch (const std::ios_base::failure&) {
            LogPrintf("[snapshot] bad snapshot format or truncated snapshot after deserializing %d coins\n",
                      coins_count - coins_left);
            return false;
        }
        if (coin.nHeight > base_height ||
            outpoint.n >= std::numeric_limits<decltype(outpoint.n)>::max() // Avoid integer wrap-around in coinstats.cpp:ApplyHash
        ) {
            LogPrintf("[snapshot] bad snapshot data after deserializing %d coins\n",
                      coins_count - coins_left);
            return false;
        }

        coins_cache.EmplaceCoinInternalDANGER(std::move(outpoint), std::move(coin));