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// Copyright (c) 2012-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include <bench/bench.h>
#include <interfaces/chain.h>
#include <node/context.h>
#include <wallet/coinselection.h>
#include <wallet/spend.h>
#include <wallet/wallet.h>
#include <set>
using node::NodeContext;
using wallet::AttemptSelection;
using wallet::CHANGE_LOWER;
using wallet::COutput;
using wallet::CWallet;
using wallet::CWalletTx;
using wallet::CoinEligibilityFilter;
using wallet::CoinSelectionParams;
using wallet::CreateDummyWalletDatabase;
using wallet::OutputGroup;
using wallet::SelectCoinsBnB;
using wallet::TxStateInactive;
static void addCoin(const CAmount& nValue, const CWallet& wallet, std::vector<std::unique_ptr<CWalletTx>>& wtxs)
{
static int nextLockTime = 0;
CMutableTransaction tx;
tx.nLockTime = nextLockTime++; // so all transactions get different hashes
tx.vout.resize(1);
tx.vout[0].nValue = nValue;
wtxs.push_back(std::make_unique<CWalletTx>(MakeTransactionRef(std::move(tx)), TxStateInactive{}));
}
// Simple benchmark for wallet coin selection. Note that it maybe be necessary
// to build up more complicated scenarios in order to get meaningful
// measurements of performance. From laanwj, "Wallet coin selection is probably
// the hardest, as you need a wider selection of scenarios, just testing the
// same one over and over isn't too useful. Generating random isn't useful
// either for measurements."
// (https://github.com/bitcoin/bitcoin/issues/7883#issuecomment-224807484)
static void CoinSelection(benchmark::Bench& bench)
{
NodeContext node;
auto chain = interfaces::MakeChain(node);
CWallet wallet(chain.get(), "", gArgs, CreateDummyWalletDatabase());
std::vector<std::unique_ptr<CWalletTx>> wtxs;
LOCK(wallet.cs_wallet);
// Add coins.
for (int i = 0; i < 1000; ++i) {
addCoin(1000 * COIN, wallet, wtxs);
}
addCoin(3 * COIN, wallet, wtxs);
// Create coins
wallet::CoinsResult available_coins;
for (const auto& wtx : wtxs) {
const auto txout = wtx->tx->vout.at(0);
available_coins.coins[OutputType::BECH32].emplace_back(COutPoint(wtx->GetHash(), 0), txout, /*depth=*/6 * 24, CalculateMaximumSignedInputSize(txout, &wallet, /*coin_control=*/nullptr), /*spendable=*/true, /*solvable=*/true, /*safe=*/true, wtx->GetTxTime(), /*from_me=*/true, /*fees=*/ 0);
}
const CoinEligibilityFilter filter_standard(1, 6, 0);
FastRandomContext rand{};
const CoinSelectionParams coin_selection_params{
rand,
/*change_output_size=*/ 34,
/*change_spend_size=*/ 148,
/*min_change_target=*/ CHANGE_LOWER,
/*effective_feerate=*/ CFeeRate(0),
/*long_term_feerate=*/ CFeeRate(0),
/*discard_feerate=*/ CFeeRate(0),
/*tx_noinputs_size=*/ 0,
/*avoid_partial=*/ false,
};
bench.run([&] {
auto result = AttemptSelection(wallet, 1003 * COIN, filter_standard, available_coins, coin_selection_params, /*allow_mixed_output_types=*/true);
assert(result);
assert(result->GetSelectedValue() == 1003 * COIN);
assert(result->GetInputSet().size() == 2);
});
}
// Copied from src/wallet/test/coinselector_tests.cpp
static void add_coin(const CAmount& nValue, int nInput, std::vector<OutputGroup>& set)
{
CMutableTransaction tx;
tx.vout.resize(nInput + 1);
tx.vout[nInput].nValue = nValue;
COutput output(COutPoint(tx.GetHash(), nInput), tx.vout.at(nInput), /*depth=*/ 0, /*input_bytes=*/ -1, /*spendable=*/ true, /*solvable=*/ true, /*safe=*/ true, /*time=*/ 0, /*from_me=*/ true, /*fees=*/ 0);
set.emplace_back();
set.back().Insert(output, /*ancestors=*/ 0, /*descendants=*/ 0, /*positive_only=*/ false);
}
// Copied from src/wallet/test/coinselector_tests.cpp
static CAmount make_hard_case(int utxos, std::vector<OutputGroup>& utxo_pool)
{
utxo_pool.clear();
CAmount target = 0;
for (int i = 0; i < utxos; ++i) {
target += (CAmount)1 << (utxos+i);
add_coin((CAmount)1 << (utxos+i), 2*i, utxo_pool);
add_coin(((CAmount)1 << (utxos+i)) + ((CAmount)1 << (utxos-1-i)), 2*i + 1, utxo_pool);
}
return target;
}
static void BnBExhaustion(benchmark::Bench& bench)
{
// Setup
std::vector<OutputGroup> utxo_pool;
bench.run([&] {
// Benchmark
CAmount target = make_hard_case(17, utxo_pool);
SelectCoinsBnB(utxo_pool, target, 0); // Should exhaust
// Cleanup
utxo_pool.clear();
});
}
BENCHMARK(CoinSelection);
BENCHMARK(BnBExhaustion);
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