Function CreateTestBlock

src/bench/connectblock.cpp:36–75

* Creates a test block containing transactions with the following properties: * - Each transaction has the same number of inputs and outputs * - All Taproot inputs use simple key path spends (no script path spends) * - All signatures use SIGHASH_ALL (default sighash) * - Each transaction spends all outputs from the previous transaction */

 * - Each transaction spends all outputs from the previous transaction
 */
CBlock CreateTestBlock(
    TestChain100Setup& test_setup,
    const std::vector<CKey>& keys,
    const std::vector<CTxOut>& outputs,
    int num_txs = 1000)
{
    Chainstate& chainstate{test_setup.m_node.chainman->ActiveChainstate()};

    const WitnessV1Taproot coinbase_taproot{XOnlyPubKey(test_setup.coinbaseKey.GetPubKey())};

    // Create the outputs that will be spent in the first transaction of the test block
    // Doing this in a separate block excludes the validation of its inputs from the benchmark
    auto& coinbase_to_spend{test_setup.m_coinbase_txns[0]};
    const auto [first_tx, _]{test_setup.CreateValidTransaction(
        {coinbase_to_spend},
        {COutPoint(coinbase_to_spend->GetHash(), 0)},
        chainstate.m_chain.Height() + 1, keys, outputs, {}, {})};
    const CScript coinbase_spk{GetScriptForDestination(coinbase_taproot)};
    test_setup.CreateAndProcessBlock({first_tx}, coinbase_spk);

    std::vector<CMutableTransaction> txs;
    txs.reserve(num_txs);
    CTransactionRef tx_to_spend{MakeTransactionRef(first_tx)};
    for (int i{0}; i < num_txs; i++) {
        std::vector<COutPoint> inputs;
        inputs.reserve(outputs.size());

        for (size_t j{0}; j < outputs.size(); j++) {
            inputs.emplace_back(tx_to_spend->GetHash(), j);
        }

        const auto [tx, _]{test_setup.CreateValidTransaction(
            {tx_to_spend}, inputs, chainstate.m_chain.Height() + 1, keys, outputs, {}, {})};
        txs.emplace_back(tx);
        tx_to_spend = MakeTransactionRef(tx);
    }

    // Coinbase output can use any output type as it is not spent and will not change the benchmark
    return test_setup.CreateBlock(txs, coinbase_spk);
}

/*
 * Creates key pairs and corresponding outputs for the benchmark transactions.