Method PopulateAndValidateSnapshot

src/validation.cpp:6813–7043

}

bool ChainstateManager::PopulateAndValidateSnapshot(
    Chainstate &snapshot_chainstate, AutoFile &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());

    BlockHash 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 ComputeUTXOStats 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;
    const auto &maybe_au_data = GetParams().AssumeutxoForHeight(base_height);

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

    const AssumeutxoData &au_data = *maybe_au_data;

    // This work comparison is a duplicate check with the one performed later in
    // ActivateSnapshot(), but is done so that we avoid doing the long work of
    // staging a snapshot that isn't actually usable.
    if (WITH_LOCK(::cs_main, return !CBlockIndexWorkComparator()(
                                 ActiveTip(), snapshot_start_block))) {
        LogPrintf("[snapshot] activation failed - work does not exceed active "
                  "chainstate\n");
        return false;
    }

    const uint64_t coins_count = metadata.m_coins_count;
    uint64_t coins_left = metadata.m_coins_count;

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

    while (coins_left > 0) {
        try {
            TxId txid;
            coins_file >> txid;
            size_t coins_per_txid{0};
            coins_per_txid = ReadCompactSize(coins_file);