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wallet: run coin selection by OutputType

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Run coin selection on each OutputType separately, choosing the best
solution according to the waste metric.

This is to avoid mixing UTXOs that are of different OutputTypes,
which can hurt privacy.

If no single OutputType can fund the transaction, then coin selection
considers the entire wallet, potentially mixing (current behavior).

This is done inside AttemptSelection so that all OutputTypes are
considered at each back-off in coin selection.
This commit is contained in:
josibake
2022-03-25 20:57:40 +01:00
parent 77b0707206
commit 438e04845b
3 changed files with 50 additions and 23 deletions
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2
src/bench/coin_selection.cpp
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@@ -76,7 +76,7 @@ static void CoinSelection(benchmark::Bench& bench)
/*avoid_partial=*/ false,
};
bench.run([&] {
auto result = AttemptSelection(wallet, 1003 * COIN, filter_standard, available_coins, coin_selection_params);
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);