Method FillBlock

src/blockencodings.cpp:182–224

}

ReadStatus PartiallyDownloadedBlock::FillBlock(CBlock& block, const std::vector<CTransactionRef>& vtx_missing, bool check_pow) {
    assert(!header.IsNull());
    uint256 hash = header.GetHash();
    block = header;
    block.vtx.resize(txn_available.size());

    size_t tx_missing_offset = 0;
    for (size_t i = 0; i < txn_available.size(); i++) {
        if (!txn_available[i]) {
            if (vtx_missing.size() <= tx_missing_offset)
                return READ_STATUS_INVALID;
            block.vtx[i] = vtx_missing[tx_missing_offset++];
        } else
            block.vtx[i] = std::move(txn_available[i]);
    }

    // Make sure we can't call FillBlock again.
    header.SetNull();
    txn_available.clear();

    if (vtx_missing.size() != tx_missing_offset)
        return READ_STATUS_INVALID;

    BlockValidationState state;
    if (!CheckBlock(block, state, Params().GetConsensus(), check_pow)) {
        // TODO: We really want to just check merkle tree manually here,
        // but that is expensive, and CheckBlock caches a block's
        // "checked-status" (in the CBlock?). CBlock should be able to
        // check its own merkle root and cache that check.
        if (state.GetResult() == BlockValidationResult::BLOCK_MUTATED)
            return READ_STATUS_FAILED; // Possible Short ID collision
        return READ_STATUS_CHECKBLOCK_FAILED;
    }

    LogPrint(BCLog::CMPCTBLOCK, "Successfully reconstructed block %s with %lu txn prefilled, %lu txn from mempool (incl at least %lu from extra pool) and %lu txn requested\n", hash.ToString(), prefilled_count, mempool_count, extra_count, vtx_missing.size());
    if (vtx_missing.size() < 5) {
        for (const auto& tx : vtx_missing) {
            LogPrint(BCLog::CMPCTBLOCK, "Reconstructed block %s required tx %s\n", hash.ToString(), tx->GetHash().ToString());
        }
    }

    return READ_STATUS_OK;
}