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Merge bitcoin/bitcoin#28994: wallet: skip BnB when SFFO is enabled

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576bee88fd fuzz: disable BnB when SFFO is enabled (furszy)
05e5ff194c test: add coverage for BnB-SFFO restriction (furszy)
0c5755761c wallet: create tx, log resulting coin selection info (furszy)
5cea25ba79 wallet: skip BnB when SFFO is active (Murch)

Pull request description:

  Solves #28918. Coming from https://github.com/bitcoin/bitcoin/issues/28918#issuecomment-1838626406 discussion.

  The intention is to decouple only the bugfix relevant commits from #28985, allowing them to be included in the 26.x release. This way, we can avoid disabling the coin selection fuzzing test for an entire release.

  Note:
  Have introduced few changes to the bug fix commit so that the unit tests pass without the additional burden introduced in #28985.

ACKs for top commit:
  josibake:
    ACK 576bee88fd
  murchandamus:
    ACK 576bee88fd
  achow101:
    ACK 576bee88fd

Tree-SHA512: f5d90eb3f3f524265afe4719495c9bf30f98b9af26cf039f7df5a7db977abae72caa7a3478cdd0ab10cd143bc1662e8fc5286b5bc10fc10f0dd582a45b45c31a
This commit is contained in:
Andrew Chow
2023-12-12 10:39:05 -05:00
parent a7484be65f 576bee88fd
commit d646ca35d9
3 changed files with 69 additions and 20 deletions
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10
src/wallet/spend.cpp
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@@ -694,9 +694,12 @@ util::Result<SelectionResult> ChooseSelectionResult(interfaces::Chain& chain, co
// Maximum allowed weight
int max_inputs_weight = MAX_STANDARD_TX_WEIGHT - (coin_selection_params.tx_noinputs_size * WITNESS_SCALE_FACTOR);
if (auto bnb_result{SelectCoinsBnB(groups.positive_group, nTargetValue, coin_selection_params.m_cost_of_change, max_inputs_weight)}) {
results.push_back(*bnb_result);
} else append_error(bnb_result);
// SFFO frequently causes issues in the context of changeless input sets: skip BnB when SFFO is active
if (!coin_selection_params.m_subtract_fee_outputs) {
if (auto bnb_result{SelectCoinsBnB(groups.positive_group, nTargetValue, coin_selection_params.m_cost_of_change, max_inputs_weight)}) {
results.push_back(*bnb_result);
} else append_error(bnb_result);
}
// As Knapsack and SRD can create change, also deduce change weight.
max_inputs_weight -= (coin_selection_params.change_output_size * WITNESS_SCALE_FACTOR);
@@ -1302,6 +1305,7 @@ static util::Result<CreatedTransactionResult> CreateTransactionInternal(
// accidental reuse.
reservedest.KeepDestination();
wallet.WalletLogPrintf("Coin Selection: Algorithm:%s, Waste Metric Score:%d\n", GetAlgorithmName(result.GetAlgo()), result.GetWaste());
wallet.WalletLogPrintf("Fee Calculation: Fee:%d Bytes:%u Tgt:%d (requested %d) Reason:\"%s\" Decay %.5f: Estimation: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out) Fail: (%g - %g) %.2f%% %.1f/(%.1f %d mem %.1f out)\n",
current_fee, nBytes, feeCalc.returnedTarget, feeCalc.desiredTarget, StringForFeeReason(feeCalc.reason), feeCalc.est.decay,
feeCalc.est.pass.start, feeCalc.est.pass.end,