public static async IAsyncEnumerable <ChangeAvoidanceSuggestionViewModel> GenerateSuggestionsAsync(
TransactionInfo transactionInfo,
BitcoinAddress destination,
Wallet wallet,
[EnumeratorCancellation] CancellationToken cancellationToken)
{
var selections = ChangelessTransactionCoinSelector.GetAllStrategyResultsAsync(
transactionInfo.Coins,
transactionInfo.FeeRate,
new TxOut(transactionInfo.Amount, destination),
cancellationToken).ConfigureAwait(false);
await foreach (var selection in selections)
{
if (selection.Any())
{
BuildTransactionResult transaction = TransactionHelpers.BuildChangelessTransaction(
wallet,
destination,
transactionInfo.UserLabels,
transactionInfo.FeeRate,
selection,
tryToSign: false);
yield return(new ChangeAvoidanceSuggestionViewModel(
transactionInfo.Amount.ToDecimal(MoneyUnit.BTC),
transaction,
wallet.Synchronizer.UsdExchangeRate));
}
}
}
public static async IAsyncEnumerable <ChangeAvoidanceSuggestionViewModel> GenerateSuggestionsAsync(
TransactionInfo transactionInfo, BitcoinAddress destination, Wallet wallet, [EnumeratorCancellation] CancellationToken cancellationToken)
{
Task <ChangeAvoidanceSuggestionViewModel?> bnbSuggestionTask = Task.Run(() =>
{
if (ChangelessTransactionCoinSelector.TryGetCoins(transactionInfo.Coins, transactionInfo.FeeRate, new TxOut(transactionInfo.Amount, destination), out IEnumerable <SmartCoin>?selection, cancellationToken))
{
BuildTransactionResult transaction = TransactionHelpers.BuildChangelessTransaction(
wallet,
destination,
transactionInfo.UserLabels,
transactionInfo.FeeRate,
selection,
tryToSign: false);
return(new ChangeAvoidanceSuggestionViewModel(
transactionInfo.Amount.ToDecimal(MoneyUnit.BTC),
transaction,
wallet.Synchronizer.UsdExchangeRate,
isOriginal: false));
}
return(null);
});
ChangeAvoidanceSuggestionViewModel?bnbSuggestion = await bnbSuggestionTask;
if (bnbSuggestion is not null)
{
yield return(bnbSuggestion);
}
}
public void GoodSuggestion()
{
using Key key = new();
List <SmartCoin> coins = GenerateDummySmartCoins(key, 6_025, 6_561, 8_192, 13_122, 50_000, 100_000, 196_939, 524_288);
var target = Money.Satoshis(150_000);
var txOut = new TxOut(target, BitcoinFactory.CreateBitcoinAddress(Network.TestNet, key));
bool found = ChangelessTransactionCoinSelector.TryGetCoins(coins, new FeeRate(satoshiPerByte: 4), txOut, out IEnumerable <SmartCoin>?selectedCoins);
Assert.True(found);
long[] solution = selectedCoins !.Select(x => x.Amount.Satoshi).ToArray();
Assert.Equal(new long[] { 100_000, 50_000, 6_025 }, solution);
public static async IAsyncEnumerable <ChangeAvoidanceSuggestionViewModel> GenerateSuggestionsAsync(
TransactionInfo transactionInfo,
BitcoinAddress destination,
Wallet wallet,
ImmutableArray <SmartCoin> coinsToUse,
int maxInputCount,
decimal usdExchangeRate,
[EnumeratorCancellation] CancellationToken cancellationToken)
{
var selections = ChangelessTransactionCoinSelector.GetAllStrategyResultsAsync(
coinsToUse,
transactionInfo.FeeRate,
new TxOut(transactionInfo.Amount, destination),
maxInputCount,
cancellationToken).ConfigureAwait(false);
HashSet <Money> foundSolutionsByAmount = new();
await foreach (var selection in selections)
{
if (selection.Any())
{
BuildTransactionResult transaction = TransactionHelpers.BuildChangelessTransaction(
wallet,
destination,
transactionInfo.UserLabels,
transactionInfo.FeeRate,
selection,
tryToSign: false);
var destinationAmount = transaction.CalculateDestinationAmount();
// If BnB solutions become the same transaction somehow, do not show the same suggestion twice.
if (!foundSolutionsByAmount.Contains(destinationAmount))
{
foundSolutionsByAmount.Add(destinationAmount);
yield return(new ChangeAvoidanceSuggestionViewModel(
transactionInfo.Amount.ToDecimal(MoneyUnit.BTC),
transaction,
usdExchangeRate));
}
}
}
}
public void GoodSuggestion()
{
using Key key = new();
List <SmartCoin> coins = GenerateDummySmartCoins(key, 6_025, 6_561, 8_192, 13_122, 50_000, 100_000, 196_939, 524_288);
var target = Money.Satoshis(150_000);
var feeRate = new FeeRate(Money.Satoshis(2));
var txOut = new TxOut(target, BitcoinFactory.CreateBitcoinAddress(Network.TestNet, key));
long[] inputCosts = coins.Select(x => feeRate.GetFee(x.ScriptPubKey.EstimateInputVsize()).Satoshi).ToArray();
Dictionary <SmartCoin, long> inputEffectiveValues = new(coins.ToDictionary(x => x, x => x.EffectiveValue(feeRate).Satoshi));
var strategy = new MoreSelectionStrategy(target, inputEffectiveValues.Values.ToArray(), inputCosts);
bool found = ChangelessTransactionCoinSelector.TryGetCoins(strategy, target, inputEffectiveValues, out var selectedCoins);
Assert.True(found);
long[] solution = selectedCoins !.Select(x => x.Amount.Satoshi).ToArray();
Assert.Equal(new long[] { 100_000, 50_000, 6_025 }, solution);
