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check fee before building tx

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fossephate 2024-10-28 10:55:26 -07:00
parent 6e45d99fed
commit 8c7db8031f
1 changed files with 22 additions and 1 deletions
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23
cw_bitcoin/lib/litecoin_wallet.dart
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@ -942,7 +942,28 @@ abstract class LitecoinWalletBase extends ElectrumWallet with Store {
// https://github.com/ltcmweb/mwebd?tab=readme-ov-file#fee-estimation
final preOutputSum =
outputs.fold<BigInt>(BigInt.zero, (acc, output) => acc + output.toOutput.amount);
final fee = utxos.sumOfUtxosValue() - preOutputSum;
var fee = utxos.sumOfUtxosValue() - preOutputSum;
// determines if the fee is correct:
BigInt _sumOutputAmounts(List<TxOutput> outputs) {
BigInt sum = BigInt.zero;
for (final e in outputs) {
sum += e.amount;
}
return sum;
}
print("fee is initially: $fee");
final sum1 = _sumOutputAmounts(outputs.map((e) => e.toOutput).toList()) + fee;
final sum2 = utxos.sumOfUtxosValue();
if (sum1 != sum2) {
final diff = sum2 - sum1;
// add the difference to the fee (abs value):
fee += diff.abs();
}
print("fee is now: $fee");
final txb =
BitcoinTransactionBuilder(utxos: utxos, outputs: outputs, fee: fee, network: network);
final resp = await CwMweb.create(CreateRequest(