mirror of
https://github.com/cypherstack/stack_wallet.git
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WIP comprehensive full RBF
This commit is contained in:
julian
parent
02dc543b2f
commit
16c89e37ab
1 changed files with 196 additions and 38 deletions
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@ -6,6 +6,7 @@ import '../../../models/isar/models/blockchain_data/v2/transaction_v2.dart';
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import '../../../models/isar/models/isar_models.dart';
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import '../../../utilities/amount/amount.dart';
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import '../../../utilities/enums/fee_rate_type_enum.dart';
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import '../../../utilities/logger.dart';
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import '../../crypto_currency/interfaces/electrumx_currency_interface.dart';
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import '../../models/tx_data.dart';
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import 'electrumx_interface.dart';
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@ -41,6 +42,13 @@ mixin RbfInterface<T extends ElectrumXCurrencyInterface>
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required TransactionV2 oldTransaction,
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required int newRate,
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}) async {
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final note = await mainDB.isar.transactionNotes
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.where()
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.walletIdEqualTo(walletId)
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.filter()
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.txidEqualTo(oldTransaction.txid)
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.findFirst();
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final Set<UTXO> utxos = {};
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for (final input in oldTransaction.inputs) {
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final utxo = UTXO(
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@ -62,51 +70,56 @@ mixin RbfInterface<T extends ElectrumXCurrencyInterface>
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utxos.add(utxo);
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}
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Amount sendAmount = oldTransaction.getAmountSentFromThisWallet(
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fractionDigits: cryptoCurrency.fractionDigits,
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);
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final List<TxRecipient> recipients = [];
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for (final output in oldTransaction.outputs) {
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if (output.addresses.length != 1) {
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throw UnsupportedError(
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"Unexpected output.addresses.length: ${output.addresses.length}",
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);
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}
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final address = output.addresses.first;
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final addressModel = await mainDB.getAddress(walletId, address);
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final isChange = addressModel?.subType == AddressSubType.change;
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// TODO: fix fragile firstWhere (or at least add some error checking)
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final address = oldTransaction.outputs
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.firstWhere(
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(e) => e.value == sendAmount.raw,
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)
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.addresses
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.first;
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recipients.add(
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(
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address: address,
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amount: Amount(
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rawValue: output.value,
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fractionDigits: cryptoCurrency.fractionDigits),
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isChange: isChange,
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),
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);
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}
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final oldFee = oldTransaction
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.getFee(fractionDigits: cryptoCurrency.fractionDigits)
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.raw;
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final inSum = utxos
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.map((e) => BigInt.from(e.value))
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.fold(BigInt.zero, (p, e) => p + e);
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if (oldTransaction
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.getFee(fractionDigits: cryptoCurrency.fractionDigits)
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.raw +
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sendAmount.raw ==
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inSum) {
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sendAmount = Amount(
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rawValue: oldTransaction
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.getFee(fractionDigits: cryptoCurrency.fractionDigits)
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.raw +
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sendAmount.raw,
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fractionDigits: cryptoCurrency.fractionDigits,
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);
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}
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final note = await mainDB.isar.transactionNotes
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.where()
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.walletIdEqualTo(walletId)
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final noChange =
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recipients.map((e) => e.isChange).fold(false, (p, e) => p || e) ==
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false;
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final otherAvailableUtxos = await mainDB
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.getUTXOs(walletId)
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.filter()
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.txidEqualTo(oldTransaction.txid)
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.findFirst();
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.usedIsNull()
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.or()
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.usedEqualTo(false)
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.findAll();
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final txData = TxData(
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recipients: [
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(
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address: address,
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amount: sendAmount,
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isChange: false,
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),
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],
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final height = await chainHeight;
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otherAvailableUtxos.removeWhere(
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(e) => !e.isConfirmed(
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height,
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cryptoCurrency.minConfirms,
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),
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);
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TxData txData = TxData(
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recipients: recipients,
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feeRateType: FeeRateType.custom,
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satsPerVByte: newRate,
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utxos: utxos,
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@ -114,6 +127,151 @@ mixin RbfInterface<T extends ElectrumXCurrencyInterface>
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note: note?.value ?? "",
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);
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return await prepareSend(txData: txData);
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if (otherAvailableUtxos.isEmpty && noChange && recipients.length == 1) {
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// safe to assume send all?
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txData = txData.copyWith(
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recipients: [
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(
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address: recipients.first.address,
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amount: Amount(
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rawValue: inSum,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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isChange: false,
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),
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],
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);
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Logging.instance.log(
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"RBF on assumed send all",
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level: LogLevel.Debug,
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);
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return await prepareSend(txData: txData);
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} else if (txData.recipients!.where((e) => e.isChange).length == 1) {
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final newFee = BigInt.from(oldTransaction.vSize! * newRate);
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final feeDifferenceRequired = newFee - oldFee;
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if (feeDifferenceRequired < BigInt.zero) {
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throw Exception("Negative new fee in RBF found");
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} else if (feeDifferenceRequired == BigInt.zero) {
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throw Exception("New fee in RBF has not changed at all");
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}
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final indexOfChangeOutput =
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txData.recipients!.indexWhere((e) => e.isChange);
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final removed = txData.recipients!.removeAt(indexOfChangeOutput);
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BigInt newChangeAmount = removed.amount.raw - feeDifferenceRequired;
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if (newChangeAmount >= BigInt.zero) {
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if (newChangeAmount >= cryptoCurrency.dustLimit.raw) {
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// yay we have enough
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// update recipients
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txData.recipients!.insert(
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indexOfChangeOutput,
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(
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address: removed.address,
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amount: Amount(
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rawValue: newChangeAmount,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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isChange: removed.isChange,
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),
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);
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Logging.instance.log(
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"RBF with same utxo set with increased fee and reduced change",
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level: LogLevel.Debug,
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);
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} else {
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// new change amount is less than dust limit.
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// TODO: check if worth adding another utxo?
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// depending on several factors, it may be cheaper to just add]
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// the dust to the fee...
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// we'll do that for now... aka remove the change output entirely
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// which now that I think about it, will reduce the size of the tx...
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// oh well...
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// do nothing here as we already removed the change output above
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Logging.instance.log(
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"RBF with same utxo set with increased fee and no change",
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level: LogLevel.Debug,
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);
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}
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return await buildTransaction(
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txData: txData.copyWith(
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usedUTXOs: txData.utxos!.toList(),
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fee: Amount(
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rawValue: newFee,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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),
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utxoSigningData: await fetchBuildTxData(txData.utxos!.toList()),
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);
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// if change amount is negative
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} else {
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// we need more utxos
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if (otherAvailableUtxos.isEmpty) {
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throw Exception("Insufficient funds to pay for increased fee");
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}
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final List<UTXO> extraUtxos = [];
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for (int i = 0; i < otherAvailableUtxos.length; i++) {
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final utxoToAdd = otherAvailableUtxos[i];
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newChangeAmount += BigInt.from(utxoToAdd.value);
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extraUtxos.add(utxoToAdd);
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if (newChangeAmount >= cryptoCurrency.dustLimit.raw) {
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break;
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}
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}
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if (newChangeAmount < cryptoCurrency.dustLimit.raw) {
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throw Exception("Insufficient funds to pay for increased fee");
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}
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txData.recipients!.insert(
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indexOfChangeOutput,
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(
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address: removed.address,
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amount: Amount(
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rawValue: newChangeAmount,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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isChange: removed.isChange,
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),
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);
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final newUtxoSet = {
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...txData.utxos!,
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...extraUtxos,
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};
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// TODO: remove assert
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assert(newUtxoSet.length == txData.utxos!.length + extraUtxos.length);
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Logging.instance.log(
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"RBF with ${extraUtxos.length} extra utxo(s)"
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" added to pay for the new fee",
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level: LogLevel.Debug,
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);
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return await buildTransaction(
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txData: txData.copyWith(
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utxos: newUtxoSet,
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usedUTXOs: newUtxoSet.toList(),
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fee: Amount(
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rawValue: newFee,
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fractionDigits: cryptoCurrency.fractionDigits,
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),
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),
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utxoSigningData: await fetchBuildTxData(newUtxoSet.toList()),
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);
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}
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} else {
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// TODO handle building a tx here in this case
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throw Exception(
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"Unexpected number of change outputs found:"
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" ${txData.recipients!.where((e) => e.isChange).length}",
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);
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}
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}
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}
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