Function generateFakeBlock

src/bench/wallet_create_tx.cpp:64–109

}

void generateFakeBlock(const CChainParams& params,
                       const node::NodeContext& context,
                       CWallet& wallet,
                       const CScript& coinbase_out_script)
{
    TipBlock tip{getTip(params, context)};

    // Create block
    CBlock block;
    CMutableTransaction coinbase_tx;
    coinbase_tx.vin.resize(1);
    coinbase_tx.vin[0].prevout.SetNull();
    coinbase_tx.vout.resize(2);
    coinbase_tx.vout[0].scriptPubKey = coinbase_out_script;
    coinbase_tx.vout[0].nValue = 48 * COIN;
    coinbase_tx.vin[0].scriptSig = CScript() << ++tip.tip_height << OP_0;
    coinbase_tx.vout[1].scriptPubKey = coinbase_out_script; // extra output
    coinbase_tx.vout[1].nValue = 1 * COIN;

    // Fill the coinbase with outputs that don't belong to the wallet in order to benchmark
    // AvailableCoins' behavior with unnecessary TXOs
    for (int i = 0; i < 50; ++i) {
        coinbase_tx.vout.emplace_back(1 * COIN / 50, CScript(OP_TRUE));
    }

    block.vtx = {MakeTransactionRef(std::move(coinbase_tx))};

    block.nVersion = VERSIONBITS_LAST_OLD_BLOCK_VERSION;
    block.hashPrevBlock = tip.prev_block_hash;
    block.hashMerkleRoot = BlockMerkleRoot(block);
    block.nTime = ++tip.prev_block_time;
    block.nBits = params.GenesisBlock().nBits;
    block.nNonce = 0;

    {
        LOCK(::cs_main);
        // Add it to the index
        CBlockIndex* pindex{context.chainman->m_blockman.AddToBlockIndex(block, context.chainman->m_best_header)};
        // add it to the chain
        context.chainman->ActiveChain().SetTip(*pindex);
    }

    // notify wallet
    const auto& pindex = WITH_LOCK(::cs_main, return context.chainman->ActiveChain().Tip());
    wallet.blockConnected(ChainstateRole{}, kernel::MakeBlockInfo(pindex, &block));
}

struct PreSelectInputs {
    // How many coins from the wallet the process should select