import 'dart:convert'; import 'dart:math'; import 'package:bip47/src/util.dart'; import 'package:bitcoindart/bitcoindart.dart' as bitcoindart; import 'package:coinlib_flutter/coinlib_flutter.dart' as coinlib; import 'package:decimal/decimal.dart'; import 'package:isar/isar.dart'; import 'package:stackwallet/electrumx_rpc/cached_electrumx_client.dart'; import 'package:stackwallet/electrumx_rpc/electrumx_client.dart'; import 'package:stackwallet/models/isar/models/isar_models.dart'; import 'package:stackwallet/models/paymint/fee_object_model.dart'; import 'package:stackwallet/models/signing_data.dart'; import 'package:stackwallet/utilities/amount/amount.dart'; import 'package:stackwallet/utilities/enums/coin_enum.dart'; import 'package:stackwallet/utilities/enums/derive_path_type_enum.dart'; import 'package:stackwallet/utilities/enums/fee_rate_type_enum.dart'; import 'package:stackwallet/utilities/logger.dart'; import 'package:stackwallet/wallets/crypto_currency/coins/firo.dart'; import 'package:stackwallet/wallets/models/tx_data.dart'; import 'package:stackwallet/wallets/wallet/intermediate/bip39_hd_wallet.dart'; import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/paynym_interface.dart'; import 'package:uuid/uuid.dart'; mixin ElectrumXInterface on Bip39HDWallet { late ElectrumXClient electrumXClient; late CachedElectrumXClient electrumXCachedClient; double? _serverVersion; // Firo server added batching without incrementing version number... bool get serverCanBatch => (_serverVersion != null && _serverVersion! >= 1.6) || cryptoCurrency is Firo; List<({String address, Amount amount})> _helperRecipientsConvert( List addrs, List satValues) { final List<({String address, Amount amount})> results = []; for (int i = 0; i < addrs.length; i++) { results.add(( address: addrs[i], amount: Amount( rawValue: BigInt.from(satValues[i]), fractionDigits: cryptoCurrency.fractionDigits, ), )); } return results; } Future coinSelection({ required TxData txData, required bool coinControl, required bool isSendAll, int additionalOutputs = 0, List? utxos, }) async { Logging.instance .log("Starting coinSelection ----------", level: LogLevel.Info); // TODO: multiple recipients one day assert(txData.recipients!.length == 1); final recipientAddress = txData.recipients!.first.address; final satoshiAmountToSend = txData.amount!.raw.toInt(); final int? satsPerVByte = txData.satsPerVByte; final selectedTxFeeRate = txData.feeRateAmount!; final List availableOutputs = utxos ?? await mainDB.getUTXOs(walletId).findAll(); final currentChainHeight = await chainHeight; final List spendableOutputs = []; int spendableSatoshiValue = 0; // Build list of spendable outputs and totaling their satoshi amount for (final utxo in availableOutputs) { if (utxo.isBlocked == false && utxo.isConfirmed(currentChainHeight, cryptoCurrency.minConfirms) && utxo.used != true) { spendableOutputs.add(utxo); spendableSatoshiValue += utxo.value; } } if (coinControl) { if (spendableOutputs.length < availableOutputs.length) { throw ArgumentError("Attempted to use an unavailable utxo"); } } // don't care about sorting if using all utxos if (!coinControl) { // sort spendable by age (oldest first) spendableOutputs.sort((a, b) => b.blockTime!.compareTo(a.blockTime!)); } Logging.instance.log("spendableOutputs.length: ${spendableOutputs.length}", level: LogLevel.Info); Logging.instance.log("availableOutputs.length: ${availableOutputs.length}", level: LogLevel.Info); Logging.instance .log("spendableOutputs: $spendableOutputs", level: LogLevel.Info); Logging.instance.log("spendableSatoshiValue: $spendableSatoshiValue", level: LogLevel.Info); Logging.instance .log("satoshiAmountToSend: $satoshiAmountToSend", level: LogLevel.Info); // If the amount the user is trying to send is smaller than the amount that they have spendable, // then return 1, which indicates that they have an insufficient balance. if (spendableSatoshiValue < satoshiAmountToSend) { // return 1; throw Exception("Insufficient balance"); // If the amount the user wants to send is exactly equal to the amount they can spend, then return // 2, which indicates that they are not leaving enough over to pay the transaction fee } else if (spendableSatoshiValue == satoshiAmountToSend && !isSendAll) { throw Exception("Insufficient balance to pay transaction fee"); // return 2; } // If neither of these statements pass, we assume that the user has a spendable balance greater // than the amount they're attempting to send. Note that this value still does not account for // the added transaction fee, which may require an extra input and will need to be checked for // later on. // Possible situation right here int satoshisBeingUsed = 0; int inputsBeingConsumed = 0; List utxoObjectsToUse = []; if (!coinControl) { for (var i = 0; satoshisBeingUsed < satoshiAmountToSend && i < spendableOutputs.length; i++) { utxoObjectsToUse.add(spendableOutputs[i]); satoshisBeingUsed += spendableOutputs[i].value; inputsBeingConsumed += 1; } for (int i = 0; i < additionalOutputs && inputsBeingConsumed < spendableOutputs.length; i++) { utxoObjectsToUse.add(spendableOutputs[inputsBeingConsumed]); satoshisBeingUsed += spendableOutputs[inputsBeingConsumed].value; inputsBeingConsumed += 1; } } else { satoshisBeingUsed = spendableSatoshiValue; utxoObjectsToUse = spendableOutputs; inputsBeingConsumed = spendableOutputs.length; } Logging.instance .log("satoshisBeingUsed: $satoshisBeingUsed", level: LogLevel.Info); Logging.instance .log("inputsBeingConsumed: $inputsBeingConsumed", level: LogLevel.Info); Logging.instance .log('utxoObjectsToUse: $utxoObjectsToUse', level: LogLevel.Info); // numberOfOutputs' length must always be equal to that of recipientsArray and recipientsAmtArray List recipientsArray = [recipientAddress]; List recipientsAmtArray = [satoshiAmountToSend]; // gather required signing data final utxoSigningData = await fetchBuildTxData(utxoObjectsToUse); if (isSendAll) { Logging.instance .log("Attempting to send all $cryptoCurrency", level: LogLevel.Info); if (txData.recipients!.length != 1) { throw Exception( "Send all to more than one recipient not yet supported", ); } final int vSizeForOneOutput = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( [recipientAddress], [satoshisBeingUsed - 1], ), ), ).vSize!; int feeForOneOutput = satsPerVByte != null ? (satsPerVByte * vSizeForOneOutput) : estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); if (satsPerVByte == null) { final int roughEstimate = roughFeeEstimate( spendableOutputs.length, 1, selectedTxFeeRate, ).raw.toInt(); if (feeForOneOutput < roughEstimate) { feeForOneOutput = roughEstimate; } } final int amount = satoshiAmountToSend - feeForOneOutput; final data = buildTransaction( txData: txData.copyWith( recipients: _helperRecipientsConvert( [recipientAddress], [amount], ), ), utxoSigningData: utxoSigningData, ); return data.copyWith( fee: Amount( rawValue: BigInt.from(feeForOneOutput), fractionDigits: cryptoCurrency.fractionDigits, ), usedUTXOs: utxoSigningData.map((e) => e.utxo).toList(), ); } final int vSizeForOneOutput; try { vSizeForOneOutput = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( [recipientAddress], [satoshisBeingUsed - 1], ), ), ).vSize!; } catch (e) { Logging.instance.log("vSizeForOneOutput: $e", level: LogLevel.Error); rethrow; } final int vSizeForTwoOutPuts; try { vSizeForTwoOutPuts = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( [recipientAddress, (await getCurrentChangeAddress())!.value], [ satoshiAmountToSend, max(0, satoshisBeingUsed - satoshiAmountToSend - 1) ], ), ), ).vSize!; } catch (e) { Logging.instance.log("vSizeForTwoOutPuts: $e", level: LogLevel.Error); rethrow; } // Assume 1 output, only for recipient and no change final feeForOneOutput = satsPerVByte != null ? (satsPerVByte * vSizeForOneOutput) : estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); // Assume 2 outputs, one for recipient and one for change final feeForTwoOutputs = satsPerVByte != null ? (satsPerVByte * vSizeForTwoOutPuts) : estimateTxFee( vSize: vSizeForTwoOutPuts, feeRatePerKB: selectedTxFeeRate, ); Logging.instance .log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info); Logging.instance .log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info); if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput) { if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput + cryptoCurrency.dustLimit.raw.toInt()) { // Here, we know that theoretically, we may be able to include another output(change) but we first need to // factor in the value of this output in satoshis. int changeOutputSize = satoshisBeingUsed - satoshiAmountToSend - feeForTwoOutputs; // We check to see if the user can pay for the new transaction with 2 outputs instead of one. If they can and // the second output's size > cryptoCurrency.dustLimit satoshis, we perform the mechanics required to properly generate and use a new // change address. if (changeOutputSize > cryptoCurrency.dustLimit.raw.toInt() && satoshisBeingUsed - satoshiAmountToSend - changeOutputSize == feeForTwoOutputs) { // generate new change address if current change address has been used await checkChangeAddressForTransactions(); final String newChangeAddress = (await getCurrentChangeAddress())!.value; int feeBeingPaid = satoshisBeingUsed - satoshiAmountToSend - changeOutputSize; recipientsArray.add(newChangeAddress); recipientsAmtArray.add(changeOutputSize); // At this point, we have the outputs we're going to use, the amounts to send along with which addresses // we intend to send these amounts to. We have enough to send instructions to build the transaction. Logging.instance.log('2 outputs in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log('Change Output Size: $changeOutputSize', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): $feeBeingPaid sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForTwoOutputs', level: LogLevel.Info); var txn = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( recipientsArray, recipientsAmtArray, ), ), ); // make sure minimum fee is accurate if that is being used if (txn.vSize! - feeBeingPaid == 1) { int changeOutputSize = satoshisBeingUsed - satoshiAmountToSend - txn.vSize!; feeBeingPaid = satoshisBeingUsed - satoshiAmountToSend - changeOutputSize; recipientsAmtArray.removeLast(); recipientsAmtArray.add(changeOutputSize); Logging.instance.log('Adjusted Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log( 'Adjusted Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Adjusted Change Output Size: $changeOutputSize', level: LogLevel.Info); Logging.instance.log( 'Adjusted Difference (fee being paid): $feeBeingPaid sats', level: LogLevel.Info); Logging.instance.log('Adjusted Estimated fee: $feeForTwoOutputs', level: LogLevel.Info); txn = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( recipientsArray, recipientsAmtArray, ), ), ); } return txn.copyWith( fee: Amount( rawValue: BigInt.from(feeBeingPaid), fractionDigits: cryptoCurrency.fractionDigits, ), usedUTXOs: utxoSigningData.map((e) => e.utxo).toList(), ); } else { // Something went wrong here. It either overshot or undershot the estimated fee amount or the changeOutputSize // is smaller than or equal to cryptoCurrency.dustLimit. Revert to single output transaction. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); final txn = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( recipientsArray, recipientsAmtArray, ), ), ); return txn.copyWith( fee: Amount( rawValue: BigInt.from(satoshisBeingUsed - satoshiAmountToSend), fractionDigits: cryptoCurrency.fractionDigits, ), usedUTXOs: utxoSigningData.map((e) => e.utxo).toList(), ); } } else { // No additional outputs needed since adding one would mean that it'd be smaller than cryptoCurrency.dustLimit sats // which makes it uneconomical to add to the transaction. Here, we pass data directly to instruct // the wallet to begin crafting the transaction that the user requested. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Difference (fee being paid): ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); final txn = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( recipientsArray, recipientsAmtArray, ), ), ); return txn.copyWith( fee: Amount( rawValue: BigInt.from(satoshisBeingUsed - satoshiAmountToSend), fractionDigits: cryptoCurrency.fractionDigits, ), usedUTXOs: utxoSigningData.map((e) => e.utxo).toList(), ); } } else if (satoshisBeingUsed - satoshiAmountToSend == feeForOneOutput) { // In this scenario, no additional change output is needed since inputs - outputs equal exactly // what we need to pay for fees. Here, we pass data directly to instruct the wallet to begin // crafting the transaction that the user requested. Logging.instance.log('1 output in tx', level: LogLevel.Info); Logging.instance .log('Input size: $satoshisBeingUsed', level: LogLevel.Info); Logging.instance.log('Recipient output size: $satoshiAmountToSend', level: LogLevel.Info); Logging.instance.log( 'Fee being paid: ${satoshisBeingUsed - satoshiAmountToSend} sats', level: LogLevel.Info); Logging.instance .log('Estimated fee: $feeForOneOutput', level: LogLevel.Info); final txn = buildTransaction( utxoSigningData: utxoSigningData, txData: txData.copyWith( recipients: _helperRecipientsConvert( recipientsArray, recipientsAmtArray, ), ), ); return txn.copyWith( fee: Amount( rawValue: BigInt.from(feeForOneOutput), fractionDigits: cryptoCurrency.fractionDigits, ), usedUTXOs: utxoSigningData.map((e) => e.utxo).toList(), ); } else { // Remember that returning 2 indicates that the user does not have a sufficient balance to // pay for the transaction fee. Ideally, at this stage, we should check if the user has any // additional outputs they're able to spend and then recalculate fees. Logging.instance.log( 'Cannot pay tx fee - checking for more outputs and trying again', level: LogLevel.Warning); // try adding more outputs if (spendableOutputs.length > inputsBeingConsumed) { return coinSelection( txData: txData, isSendAll: isSendAll, additionalOutputs: additionalOutputs + 1, utxos: utxos, coinControl: coinControl, ); } throw Exception("Insufficient balance to pay transaction fee"); // return 2; } } Future> fetchBuildTxData( List utxosToUse, ) async { // return data List signingData = []; try { // Populating the addresses to check for (var i = 0; i < utxosToUse.length; i++) { final derivePathType = cryptoCurrency.addressType(address: utxosToUse[i].address!); signingData.add( SigningData( derivePathType: derivePathType, utxo: utxosToUse[i], ), ); } final convertedNetwork = bitcoindart.NetworkType( messagePrefix: cryptoCurrency.networkParams.messagePrefix, bech32: cryptoCurrency.networkParams.bech32Hrp, bip32: bitcoindart.Bip32Type( public: cryptoCurrency.networkParams.pubHDPrefix, private: cryptoCurrency.networkParams.privHDPrefix, ), pubKeyHash: cryptoCurrency.networkParams.p2pkhPrefix, scriptHash: cryptoCurrency.networkParams.p2shPrefix, wif: cryptoCurrency.networkParams.wifPrefix, ); final root = await getRootHDNode(); for (final sd in signingData) { coinlib.HDPrivateKey? keys; final address = await mainDB.getAddress(walletId, sd.utxo.address!); if (address?.derivationPath != null) { if (address!.subType == AddressSubType.paynymReceive) { // TODO paynym // final code = await paymentCodeStringByKey(address.otherData!); // // final bip47base = await getBip47BaseNode(); // // final privateKey = await getPrivateKeyForPaynymReceivingAddress( // paymentCodeString: code!, // index: address.derivationIndex, // ); // // keys = coinlib.HDPrivateKey.fromKeyAndChainCode( // privateKey, // bip47base.chainCode, // ); } else { keys = root.derivePath(address.derivationPath!.value); } } if (keys == null) { throw Exception( "Failed to fetch signing data. Local db corrupt. Rescan wallet."); } // final coinlib.Input input; final pubKey = keys.publicKey.data; final bitcoindart.PaymentData data; switch (sd.derivePathType) { case DerivePathType.bip44: // input = coinlib.P2PKHInput( // prevOut: coinlib.OutPoint.fromHex(sd.utxo.txid, sd.utxo.vout), // publicKey: keys.publicKey, // ); data = bitcoindart .P2PKH( data: bitcoindart.PaymentData( pubkey: pubKey, ), network: convertedNetwork, ) .data; break; // // case DerivePathType.bip49: // // input = P2s // // final p2wpkh = P2WPKH( // data: PaymentData( // pubkey: Format.stringToUint8List(pubKey), // ), // network: _network, // ).data; // redeemScript = p2wpkh.output; // data = P2SH( // data: PaymentData(redeem: p2wpkh), // network: _network, // ).data; // break; case DerivePathType.bip84: // input = coinlib.P2WPKHInput( // prevOut: coinlib.OutPoint.fromHex(sd.utxo.txid, sd.utxo.vout), // publicKey: keys.publicKey, // ); data = bitcoindart .P2WPKH( data: bitcoindart.PaymentData( pubkey: pubKey, ), network: convertedNetwork, ) .data; break; default: throw Exception("DerivePathType unsupported"); } // sd.output = input.script!.compiled; sd.output = data.output!; sd.keyPair = bitcoindart.ECPair.fromPrivateKey( keys.privateKey.data, compressed: keys.privateKey.compressed, network: convertedNetwork, ); } return signingData; } catch (e, s) { Logging.instance .log("fetchBuildTxData() threw: $e,\n$s", level: LogLevel.Error); rethrow; } } /// Builds and signs a transaction TxData buildTransaction({ required TxData txData, required List utxoSigningData, }) { Logging.instance .log("Starting buildTransaction ----------", level: LogLevel.Info); // TODO: use coinlib final txb = bitcoindart.TransactionBuilder( network: bitcoindart.NetworkType( messagePrefix: cryptoCurrency.networkParams.messagePrefix, bech32: cryptoCurrency.networkParams.bech32Hrp, bip32: bitcoindart.Bip32Type( public: cryptoCurrency.networkParams.pubHDPrefix, private: cryptoCurrency.networkParams.privHDPrefix, ), pubKeyHash: cryptoCurrency.networkParams.p2pkhPrefix, scriptHash: cryptoCurrency.networkParams.p2shPrefix, wif: cryptoCurrency.networkParams.wifPrefix, ), ); txb.setVersion(1); // TODO possibly override this for certain coins? // Add transaction inputs for (var i = 0; i < utxoSigningData.length; i++) { final txid = utxoSigningData[i].utxo.txid; txb.addInput( txid, utxoSigningData[i].utxo.vout, null, utxoSigningData[i].output!, ); } // Add transaction output for (var i = 0; i < txData.recipients!.length; i++) { txb.addOutput( txData.recipients![i].address, txData.recipients![i].amount.raw.toInt(), ); } try { // Sign the transaction accordingly for (var i = 0; i < utxoSigningData.length; i++) { txb.sign( vin: i, keyPair: utxoSigningData[i].keyPair!, witnessValue: utxoSigningData[i].utxo.value, redeemScript: utxoSigningData[i].redeemScript, ); } } catch (e, s) { Logging.instance.log("Caught exception while signing transaction: $e\n$s", level: LogLevel.Error); rethrow; } final builtTx = txb.build(); final vSize = builtTx.virtualSize(); return txData.copyWith( raw: builtTx.toHex(), vSize: vSize, ); } Future fetchChainHeight() async { try { final result = await electrumXClient.getBlockHeadTip(); return result["height"] as int; } catch (e) { rethrow; } } Future fetchTxCount({required String addressScriptHash}) async { final transactions = await electrumXClient.getHistory(scripthash: addressScriptHash); return transactions.length; } Future> fetchTxCountBatched({ required Map addresses, }) async { try { final Map> args = {}; for (final entry in addresses.entries) { args[entry.key] = [ cryptoCurrency.addressToScriptHash(address: entry.value), ]; } final response = await electrumXClient.getBatchHistory(args: args); final Map result = {}; for (final entry in response.entries) { result[entry.key] = entry.value.length; } return result; } catch (e, s) { Logging.instance.log( "Exception rethrown in _getBatchTxCount(address: $addresses: $e\n$s", level: LogLevel.Error); rethrow; } } Future> fetchTransactionsV1({ required List
addresses, required int currentChainHeight, }) async { final List<({String txHash, int height, String address})> allTxHashes = (await fetchHistory(addresses.map((e) => e.value).toList())) .map( (e) => ( txHash: e["tx_hash"] as String, height: e["height"] as int, address: e["address"] as String, ), ) .toList(); List> allTransactions = []; for (final data in allTxHashes) { final tx = await electrumXCachedClient.getTransaction( txHash: data.txHash, verbose: true, coin: cryptoCurrency.coin, ); // check for duplicates before adding to list if (allTransactions .indexWhere((e) => e["txid"] == tx["txid"] as String) == -1) { tx["address"] = addresses.firstWhere((e) => e.value == data.address); tx["height"] = data.height; allTransactions.add(tx); } } final List<({Transaction transaction, Address address})> txnsData = []; for (final txObject in allTransactions) { final data = await _parseTransactionV1( txObject, addresses, ); txnsData.add(data); } return txnsData; } Future getCurrentElectrumXNode() async { final node = getCurrentNode(); return ElectrumXNode( address: node.host, port: node.port, name: node.name, useSSL: node.useSSL, id: node.id, ); } Future updateElectrumX({required ElectrumXNode newNode}) async { final failovers = nodeService .failoverNodesFor(coin: cryptoCurrency.coin) .map((e) => ElectrumXNode( address: e.host, port: e.port, name: e.name, id: e.id, useSSL: e.useSSL, )) .toList(); final newNode = await getCurrentElectrumXNode(); electrumXClient = ElectrumXClient.from( node: newNode, prefs: prefs, failovers: failovers, ); electrumXCachedClient = CachedElectrumXClient.from( electrumXClient: electrumXClient, ); } //============================================================================ Future<({List
addresses, int index})> checkGapsBatched( int txCountBatchSize, coinlib.HDPrivateKey root, DerivePathType type, int chain, ) async { List
addressArray = []; int gapCounter = 0; int highestIndexWithHistory = 0; for (int index = 0; index < cryptoCurrency.maxNumberOfIndexesToCheck && gapCounter < cryptoCurrency.maxUnusedAddressGap; index += txCountBatchSize) { List iterationsAddressArray = []; Logging.instance.log( "index: $index, \t GapCounter $chain ${type.name}: $gapCounter", level: LogLevel.Info); final _id = "k_$index"; Map txCountCallArgs = {}; for (int j = 0; j < txCountBatchSize; j++) { final derivePath = cryptoCurrency.constructDerivePath( derivePathType: type, chain: chain, index: index + j, ); final keys = root.derivePath(derivePath); final addressData = cryptoCurrency.getAddressForPublicKey( publicKey: keys.publicKey, derivePathType: type, ); final addressString = convertAddressString( addressData.address.toString(), ); final address = Address( walletId: walletId, value: addressString, publicKey: keys.publicKey.data, type: addressData.addressType, derivationIndex: index + j, derivationPath: DerivationPath()..value = derivePath, subType: chain == 0 ? AddressSubType.receiving : AddressSubType.change, ); addressArray.add(address); txCountCallArgs.addAll({ "${_id}_$j": addressString, }); } // get address tx counts final counts = await fetchTxCountBatched(addresses: txCountCallArgs); // check and add appropriate addresses for (int k = 0; k < txCountBatchSize; k++) { int count = counts["${_id}_$k"]!; if (count > 0) { iterationsAddressArray.add(txCountCallArgs["${_id}_$k"]!); // update highest highestIndexWithHistory = index + k; // reset counter gapCounter = 0; } // increase counter when no tx history found if (count == 0) { gapCounter++; } } // // cache all the transactions while waiting for the current function to finish. // unawaited(getTransactionCacheEarly(addressArray)); } return (index: highestIndexWithHistory, addresses: addressArray); } Future<({List
addresses, int index})> checkGapsLinearly( coinlib.HDPrivateKey root, DerivePathType type, int chain, ) async { List
addressArray = []; int gapCounter = 0; int index = 0; for (; index < cryptoCurrency.maxNumberOfIndexesToCheck && gapCounter < cryptoCurrency.maxUnusedAddressGap; index++) { Logging.instance.log( "index: $index, \t GapCounter chain=$chain ${type.name}: $gapCounter", level: LogLevel.Info); final derivePath = cryptoCurrency.constructDerivePath( derivePathType: type, chain: chain, index: index, ); final keys = root.derivePath(derivePath); final addressData = cryptoCurrency.getAddressForPublicKey( publicKey: keys.publicKey, derivePathType: type, ); final addressString = convertAddressString( addressData.address.toString(), ); final address = Address( walletId: walletId, value: addressString, publicKey: keys.publicKey.data, type: addressData.addressType, derivationIndex: index, derivationPath: DerivationPath()..value = derivePath, subType: chain == 0 ? AddressSubType.receiving : AddressSubType.change, ); // get address tx count final count = await fetchTxCount( addressScriptHash: cryptoCurrency.addressToScriptHash( address: address.value, ), ); // check and add appropriate addresses if (count > 0) { // add address to array addressArray.add(address); // reset counter gapCounter = 0; // add info to derivations } else { // increase counter when no tx history found gapCounter++; } } return (addresses: addressArray, index: index); } Future>> fetchHistory( Iterable allAddresses, ) async { try { List> allTxHashes = []; if (serverCanBatch) { final Map>> batches = {}; final Map requestIdToAddressMap = {}; const batchSizeMax = 100; int batchNumber = 0; for (int i = 0; i < allAddresses.length; i++) { if (batches[batchNumber] == null) { batches[batchNumber] = {}; } final scriptHash = cryptoCurrency.addressToScriptHash( address: allAddresses.elementAt(i), ); final id = Logger.isTestEnv ? "$i" : const Uuid().v1(); requestIdToAddressMap[id] = allAddresses.elementAt(i); batches[batchNumber]!.addAll({ id: [scriptHash] }); if (i % batchSizeMax == batchSizeMax - 1) { batchNumber++; } } for (int i = 0; i < batches.length; i++) { final response = await electrumXClient.getBatchHistory(args: batches[i]!); for (final entry in response.entries) { for (int j = 0; j < entry.value.length; j++) { entry.value[j]["address"] = requestIdToAddressMap[entry.key]; if (!allTxHashes.contains(entry.value[j])) { allTxHashes.add(entry.value[j]); } } } } } else { for (int i = 0; i < allAddresses.length; i++) { final scriptHash = cryptoCurrency.addressToScriptHash( address: allAddresses.elementAt(1), ); final response = await electrumXClient.getHistory( scripthash: scriptHash, ); for (int j = 0; j < response.length; j++) { response[j]["address"] = allAddresses.elementAt(1); if (!allTxHashes.contains(response[j])) { allTxHashes.add(response[j]); } } } } return allTxHashes; } catch (e, s) { Logging.instance.log("_fetchHistory: $e\n$s", level: LogLevel.Error); rethrow; } } /// The optional (nullable) param [checkBlock] is a callback that can be used /// to check if a utxo should be marked as blocked Future parseUTXO({ required Map jsonUTXO, }) async { final txn = await electrumXCachedClient.getTransaction( txHash: jsonUTXO["tx_hash"] as String, verbose: true, coin: cryptoCurrency.coin, ); final vout = jsonUTXO["tx_pos"] as int; final outputs = txn["vout"] as List; String? scriptPubKey; String? utxoOwnerAddress; // get UTXO owner address for (final output in outputs) { if (output["n"] == vout) { scriptPubKey = output["scriptPubKey"]?["hex"] as String?; utxoOwnerAddress = output["scriptPubKey"]?["addresses"]?[0] as String? ?? output["scriptPubKey"]?["address"] as String?; } } final checkBlockResult = checkBlockUTXO(jsonUTXO, scriptPubKey, txn); final utxo = UTXO( walletId: walletId, txid: txn["txid"] as String, vout: vout, value: jsonUTXO["value"] as int, name: "", isBlocked: checkBlockResult.blocked, blockedReason: checkBlockResult.blockedReason, isCoinbase: txn["is_coinbase"] as bool? ?? false, blockHash: txn["blockhash"] as String?, blockHeight: jsonUTXO["height"] as int?, blockTime: txn["blocktime"] as int?, address: utxoOwnerAddress, ); return utxo; } Future<({Transaction transaction, Address address})> _parseTransactionV1( Map txData, List
myAddresses, ) async { Set receivingAddresses = myAddresses .where((e) => e.subType == AddressSubType.receiving || e.subType == AddressSubType.paynymReceive || e.subType == AddressSubType.paynymNotification) .map((e) => e.value) .toSet(); Set changeAddresses = myAddresses .where((e) => e.subType == AddressSubType.change) .map((e) => e.value) .toSet(); Set inputAddresses = {}; Set outputAddresses = {}; Amount totalInputValue = Amount( rawValue: BigInt.zero, fractionDigits: cryptoCurrency.coin.decimals, ); Amount totalOutputValue = Amount( rawValue: BigInt.zero, fractionDigits: cryptoCurrency.coin.decimals, ); Amount amountSentFromWallet = Amount( rawValue: BigInt.zero, fractionDigits: cryptoCurrency.coin.decimals, ); Amount amountReceivedInWallet = Amount( rawValue: BigInt.zero, fractionDigits: cryptoCurrency.coin.decimals, ); Amount changeAmount = Amount( rawValue: BigInt.zero, fractionDigits: cryptoCurrency.coin.decimals, ); // parse inputs for (final input in txData["vin"] as List) { final prevTxid = input["txid"] as String; final prevOut = input["vout"] as int; // fetch input tx to get address final inputTx = await electrumXCachedClient.getTransaction( txHash: prevTxid, coin: cryptoCurrency.coin, ); for (final output in inputTx["vout"] as List) { // check matching output if (prevOut == output["n"]) { // get value final value = Amount.fromDecimal( Decimal.parse(output["value"].toString()), fractionDigits: cryptoCurrency.coin.decimals, ); // add value to total totalInputValue += value; // get input(prevOut) address final address = output["scriptPubKey"]?["addresses"]?[0] as String? ?? output["scriptPubKey"]?["address"] as String?; if (address != null) { inputAddresses.add(address); // if input was from my wallet, add value to amount sent if (receivingAddresses.contains(address) || changeAddresses.contains(address)) { amountSentFromWallet += value; } } } } } // parse outputs for (final output in txData["vout"] as List) { // get value final value = Amount.fromDecimal( Decimal.parse(output["value"].toString()), fractionDigits: cryptoCurrency.coin.decimals, ); // add value to total totalOutputValue += value; // get output address final address = output["scriptPubKey"]?["addresses"]?[0] as String? ?? output["scriptPubKey"]?["address"] as String?; if (address != null) { outputAddresses.add(address); // if output was to my wallet, add value to amount received if (receivingAddresses.contains(address)) { amountReceivedInWallet += value; } else if (changeAddresses.contains(address)) { changeAmount += value; } } } final mySentFromAddresses = [ ...receivingAddresses.intersection(inputAddresses), ...changeAddresses.intersection(inputAddresses) ]; final myReceivedOnAddresses = receivingAddresses.intersection(outputAddresses); final myChangeReceivedOnAddresses = changeAddresses.intersection(outputAddresses); final fee = totalInputValue - totalOutputValue; // this is the address initially used to fetch the txid Address transactionAddress = txData["address"] as Address; TransactionType type; Amount amount; if (mySentFromAddresses.isNotEmpty && myReceivedOnAddresses.isNotEmpty) { // tx is sent to self type = TransactionType.sentToSelf; // should be 0 amount = amountSentFromWallet - amountReceivedInWallet - fee - changeAmount; } else if (mySentFromAddresses.isNotEmpty) { // outgoing tx type = TransactionType.outgoing; amount = amountSentFromWallet - changeAmount - fee; // non wallet addresses found in tx outputs final nonWalletOutAddresses = outputAddresses.difference( myChangeReceivedOnAddresses, ); if (nonWalletOutAddresses.isNotEmpty) { final possible = nonWalletOutAddresses.first; if (transactionAddress.value != possible) { transactionAddress = Address( walletId: myAddresses.first.walletId, value: possible, derivationIndex: -1, derivationPath: null, subType: AddressSubType.nonWallet, type: AddressType.nonWallet, publicKey: [], ); } } else { // some other type of tx where the receiving address is // one of my change addresses type = TransactionType.sentToSelf; amount = changeAmount; } } else { // incoming tx type = TransactionType.incoming; amount = amountReceivedInWallet; } List outs = []; List ins = []; for (final json in txData["vin"] as List) { bool isCoinBase = json['coinbase'] != null; String? witness; if (json['witness'] != null && json['witness'] is String) { witness = json['witness'] as String; } else if (json['txinwitness'] != null) { if (json['txinwitness'] is List) { witness = jsonEncode(json['txinwitness']); } } final input = Input( txid: json['txid'] as String, vout: json['vout'] as int? ?? -1, scriptSig: json['scriptSig']?['hex'] as String?, scriptSigAsm: json['scriptSig']?['asm'] as String?, isCoinbase: isCoinBase ? isCoinBase : json['is_coinbase'] as bool?, sequence: json['sequence'] as int?, innerRedeemScriptAsm: json['innerRedeemscriptAsm'] as String?, witness: witness, ); ins.add(input); } for (final json in txData["vout"] as List) { final output = Output( scriptPubKey: json['scriptPubKey']?['hex'] as String?, scriptPubKeyAsm: json['scriptPubKey']?['asm'] as String?, scriptPubKeyType: json['scriptPubKey']?['type'] as String?, scriptPubKeyAddress: json["scriptPubKey"]?["addresses"]?[0] as String? ?? json['scriptPubKey']?['type'] as String? ?? "", value: Amount.fromDecimal( Decimal.parse(json["value"].toString()), fractionDigits: cryptoCurrency.coin.decimals, ).raw.toInt(), ); outs.add(output); } TransactionSubType txSubType = TransactionSubType.none; if (this is PaynymInterface && outs.length > 1 && ins.isNotEmpty) { for (int i = 0; i < outs.length; i++) { List? scriptChunks = outs[i].scriptPubKeyAsm?.split(" "); if (scriptChunks?.length == 2 && scriptChunks?[0] == "OP_RETURN") { final blindedPaymentCode = scriptChunks![1]; final bytes = blindedPaymentCode.fromHex; // https://en.bitcoin.it/wiki/BIP_0047#Sending if (bytes.length == 80 && bytes.first == 1) { txSubType = TransactionSubType.bip47Notification; } } } } final tx = Transaction( walletId: myAddresses.first.walletId, txid: txData["txid"] as String, timestamp: txData["blocktime"] as int? ?? (DateTime.now().millisecondsSinceEpoch ~/ 1000), type: type, subType: txSubType, // amount may overflow. Deprecated. Use amountString amount: amount.raw.toInt(), amountString: amount.toJsonString(), fee: fee.raw.toInt(), height: txData["height"] as int?, isCancelled: false, isLelantus: false, slateId: null, otherData: null, nonce: null, inputs: ins, outputs: outs, numberOfMessages: null, ); return (transaction: tx, address: transactionAddress); } //============================================================================ @override Future updateChainHeight() async { final height = await fetchChainHeight(); await info.updateCachedChainHeight( newHeight: height, isar: mainDB.isar, ); } @override Future pingCheck() async { try { final result = await electrumXClient.ping(); return result; } catch (_) { return false; } } @override Future updateNode() async { final node = await getCurrentElectrumXNode(); await updateElectrumX(newNode: node); } FeeObject? _cachedFees; @override Future get fees async { try { const int f = 1, m = 5, s = 20; final fast = await electrumXClient.estimateFee(blocks: f); final medium = await electrumXClient.estimateFee(blocks: m); final slow = await electrumXClient.estimateFee(blocks: s); final feeObject = FeeObject( numberOfBlocksFast: f, numberOfBlocksAverage: m, numberOfBlocksSlow: s, fast: Amount.fromDecimal( fast, fractionDigits: info.coin.decimals, ).raw.toInt(), medium: Amount.fromDecimal( medium, fractionDigits: info.coin.decimals, ).raw.toInt(), slow: Amount.fromDecimal( slow, fractionDigits: info.coin.decimals, ).raw.toInt(), ); Logging.instance.log("fetched fees: $feeObject", level: LogLevel.Info); _cachedFees = feeObject; return _cachedFees!; } catch (e) { Logging.instance.log( "Exception rethrown from _getFees(): $e", level: LogLevel.Error, ); if (_cachedFees == null) { rethrow; } else { return _cachedFees!; } } } @override Future estimateFeeFor(Amount amount, int feeRate) async { final available = info.cachedBalance.spendable; final utxos = _spendableUTXOs(await mainDB.getUTXOs(walletId).findAll()); if (available == amount) { return amount - (await _sweepAllEstimate(feeRate, utxos)); } else if (amount <= Amount.zero || amount > available) { return roughFeeEstimate(1, 2, feeRate); } Amount runningBalance = Amount( rawValue: BigInt.zero, fractionDigits: info.coin.decimals, ); int inputCount = 0; for (final output in utxos) { if (!output.isBlocked) { runningBalance += Amount( rawValue: BigInt.from(output.value), fractionDigits: info.coin.decimals, ); inputCount++; if (runningBalance > amount) { break; } } } final oneOutPutFee = roughFeeEstimate(inputCount, 1, feeRate); final twoOutPutFee = roughFeeEstimate(inputCount, 2, feeRate); if (runningBalance - amount > oneOutPutFee) { if (runningBalance - amount > oneOutPutFee + cryptoCurrency.dustLimit) { final change = runningBalance - amount - twoOutPutFee; if (change > cryptoCurrency.dustLimit && runningBalance - amount - change == twoOutPutFee) { return runningBalance - amount - change; } else { return runningBalance - amount; } } else { return runningBalance - amount; } } else if (runningBalance - amount == oneOutPutFee) { return oneOutPutFee; } else { return twoOutPutFee; } } @override Future checkReceivingAddressForTransactions() async { try { final currentReceiving = await getCurrentReceivingAddress(); final bool needsGenerate; if (currentReceiving == null) { // no addresses in db yet for some reason. // Should not happen at this point... needsGenerate = true; } else { final txCount = await fetchTxCount( addressScriptHash: cryptoCurrency.addressToScriptHash( address: currentReceiving.value, ), ); needsGenerate = txCount > 0 || currentReceiving.derivationIndex < 0; } if (needsGenerate) { await generateNewReceivingAddress(); // TODO: get rid of this? Could cause problems (long loading/infinite loop or something) // keep checking until address with no tx history is set as current await checkReceivingAddressForTransactions(); } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkReceivingAddressForTransactions" "($cryptoCurrency): $e\n$s", level: LogLevel.Error, ); rethrow; } } @override Future checkChangeAddressForTransactions() async { try { final currentChange = await getCurrentChangeAddress(); final bool needsGenerate; if (currentChange == null) { // no addresses in db yet for some reason. // Should not happen at this point... needsGenerate = true; } else { final txCount = await fetchTxCount( addressScriptHash: cryptoCurrency.addressToScriptHash( address: currentChange.value, ), ); needsGenerate = txCount > 0 || currentChange.derivationIndex < 0; } if (needsGenerate) { await generateNewChangeAddress(); // TODO: get rid of this? Could cause problems (long loading/infinite loop or something) // keep checking until address with no tx history is set as current await checkChangeAddressForTransactions(); } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkChangeAddressForTransactions" "($cryptoCurrency): $e\n$s", level: LogLevel.Error, ); rethrow; } } @override Future recover({required bool isRescan}) async { final root = await getRootHDNode(); final List addresses})>> receiveFutures = []; final List addresses})>> changeFutures = []; const receiveChain = 0; const changeChain = 1; const txCountBatchSize = 12; try { await refreshMutex.protect(() async { if (isRescan) { // clear cache await electrumXCachedClient.clearSharedTransactionCache( coin: info.coin); // clear blockchain info await mainDB.deleteWalletBlockchainData(walletId); } // receiving addresses Logging.instance.log( "checking receiving addresses...", level: LogLevel.Info, ); for (final type in cryptoCurrency.supportedDerivationPathTypes) { receiveFutures.add( serverCanBatch ? checkGapsBatched( txCountBatchSize, root, type, receiveChain, ) : checkGapsLinearly( root, type, receiveChain, ), ); } // change addresses Logging.instance.log( "checking change addresses...", level: LogLevel.Info, ); for (final type in cryptoCurrency.supportedDerivationPathTypes) { changeFutures.add( serverCanBatch ? checkGapsBatched( txCountBatchSize, root, type, changeChain, ) : checkGapsLinearly( root, type, changeChain, ), ); } // io limitations may require running these linearly instead final futuresResult = await Future.wait([ Future.wait(receiveFutures), Future.wait(changeFutures), ]); final receiveResults = futuresResult[0]; final changeResults = futuresResult[1]; final List
addressesToStore = []; int highestReceivingIndexWithHistory = 0; for (final tuple in receiveResults) { if (tuple.addresses.isEmpty) { await checkReceivingAddressForTransactions(); } else { highestReceivingIndexWithHistory = max( tuple.index, highestReceivingIndexWithHistory, ); addressesToStore.addAll(tuple.addresses); } } int highestChangeIndexWithHistory = 0; // If restoring a wallet that never sent any funds with change, then set changeArray // manually. If we didn't do this, it'd store an empty array. for (final tuple in changeResults) { if (tuple.addresses.isEmpty) { await checkChangeAddressForTransactions(); } else { highestChangeIndexWithHistory = max( tuple.index, highestChangeIndexWithHistory, ); addressesToStore.addAll(tuple.addresses); } } // remove extra addresses to help minimize risk of creating a large gap addressesToStore.removeWhere((e) => e.subType == AddressSubType.change && e.derivationIndex > highestChangeIndexWithHistory); addressesToStore.removeWhere((e) => e.subType == AddressSubType.receiving && e.derivationIndex > highestReceivingIndexWithHistory); await mainDB.updateOrPutAddresses(addressesToStore); }); await refresh(); } catch (e, s) { Logging.instance.log( "Exception rethrown from electrumx_mixin recover(): $e\n$s", level: LogLevel.Info); rethrow; } } @override Future updateUTXOs() async { final allAddresses = await fetchAddressesForElectrumXScan(); try { final fetchedUtxoList = >>[]; if (serverCanBatch) { final Map>> batches = {}; const batchSizeMax = 10; int batchNumber = 0; for (int i = 0; i < allAddresses.length; i++) { if (batches[batchNumber] == null) { batches[batchNumber] = {}; } final scriptHash = cryptoCurrency.addressToScriptHash( address: allAddresses[i].value, ); batches[batchNumber]!.addAll({ scriptHash: [scriptHash] }); if (i % batchSizeMax == batchSizeMax - 1) { batchNumber++; } } for (int i = 0; i < batches.length; i++) { final response = await electrumXClient.getBatchUTXOs(args: batches[i]!); for (final entry in response.entries) { if (entry.value.isNotEmpty) { fetchedUtxoList.add(entry.value); } } } } else { for (int i = 0; i < allAddresses.length; i++) { final scriptHash = cryptoCurrency.addressToScriptHash( address: allAddresses[i].value, ); final utxos = await electrumXClient.getUTXOs(scripthash: scriptHash); if (utxos.isNotEmpty) { fetchedUtxoList.add(utxos); } } } final List outputArray = []; for (int i = 0; i < fetchedUtxoList.length; i++) { for (int j = 0; j < fetchedUtxoList[i].length; j++) { final utxo = await parseUTXO( jsonUTXO: fetchedUtxoList[i][j], ); outputArray.add(utxo); } } await mainDB.updateUTXOs(walletId, outputArray); } catch (e, s) { Logging.instance.log( "Output fetch unsuccessful: $e\n$s", level: LogLevel.Error, ); } } @override Future confirmSend({required TxData txData}) async { try { Logging.instance.log("confirmSend txData: $txData", level: LogLevel.Info); final txHash = await electrumXClient.broadcastTransaction( rawTx: txData.raw!, ); Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info); txData = txData.copyWith( usedUTXOs: txData.usedUTXOs!.map((e) => e.copyWith(used: true)).toList(), // TODO revisit setting these both txHash: txHash, txid: txHash, ); // mark utxos as used await mainDB.putUTXOs(txData.usedUTXOs!); return txData; } catch (e, s) { Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s", level: LogLevel.Error); rethrow; } } @override Future prepareSend({required TxData txData}) async { try { final feeRateType = txData.feeRateType; final customSatsPerVByte = txData.satsPerVByte; final feeRateAmount = txData.feeRateAmount; final utxos = txData.utxos; if (customSatsPerVByte != null) { // check for send all bool isSendAll = false; if (txData.amount == info.cachedBalance.spendable) { isSendAll = true; } final bool coinControl = utxos != null; final result = await coinSelection( txData: txData.copyWith(feeRateAmount: -1), isSendAll: isSendAll, utxos: utxos?.toList(), coinControl: coinControl, ); Logging.instance .log("PREPARE SEND RESULT: $result", level: LogLevel.Info); if (txData.fee!.raw.toInt() < txData.vSize!) { throw Exception( "Error in fee calculation: Transaction fee cannot be less than vSize"); } return result; } else if (feeRateType is FeeRateType || feeRateAmount is int) { late final int rate; if (feeRateType is FeeRateType) { int fee = 0; final feeObject = await fees; switch (feeRateType) { case FeeRateType.fast: fee = feeObject.fast; break; case FeeRateType.average: fee = feeObject.medium; break; case FeeRateType.slow: fee = feeObject.slow; break; default: throw ArgumentError("Invalid use of custom fee"); } rate = fee; } else { rate = feeRateAmount as int; } // check for send all bool isSendAll = false; if (txData.amount == info.cachedBalance.spendable) { isSendAll = true; } final bool coinControl = utxos != null; final result = await coinSelection( txData: txData.copyWith( feeRateAmount: rate, ), isSendAll: isSendAll, utxos: utxos?.toList(), coinControl: coinControl, ); Logging.instance.log("prepare send: $result", level: LogLevel.Info); if (result.fee!.raw.toInt() < result.vSize!) { throw Exception( "Error in fee calculation: Transaction fee cannot be less than vSize"); } return result; } else { throw ArgumentError("Invalid fee rate argument provided!"); } } catch (e, s) { Logging.instance.log("Exception rethrown from prepareSend(): $e\n$s", level: LogLevel.Error); rethrow; } } @override Future init() async { try { final features = await electrumXClient .getServerFeatures() .timeout(const Duration(seconds: 3)); Logging.instance.log("features: $features", level: LogLevel.Info); _serverVersion = _parseServerVersion(features["server_version"] as String); if (cryptoCurrency.genesisHash != features['genesis_hash']) { throw Exception("genesis hash does not match!"); } } catch (e, s) { Logging.instance.log("$e/n$s", level: LogLevel.Info); } await super.init(); } // =========================================================================== // ========== Interface functions ============================================ int estimateTxFee({required int vSize, required int feeRatePerKB}); Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB); Future> fetchAddressesForElectrumXScan(); /// Certain coins need to check if the utxo should be marked /// as blocked as well as give a reason. ({String? blockedReason, bool blocked}) checkBlockUTXO( Map jsonUTXO, String? scriptPubKeyHex, Map jsonTX, ); // =========================================================================== // ========== private helpers ================================================ List _spendableUTXOs(List utxos) { return utxos .where( (e) => !e.isBlocked && e.isConfirmed( info.cachedChainHeight, cryptoCurrency.minConfirms, ), ) .toList(); } Future _sweepAllEstimate(int feeRate, List usableUTXOs) async { final available = usableUTXOs .map((e) => BigInt.from(e.value)) .fold(BigInt.zero, (p, e) => p + e); final inputCount = usableUTXOs.length; // transaction will only have 1 output minus the fee final estimatedFee = roughFeeEstimate(inputCount, 1, feeRate); return Amount( rawValue: available, fractionDigits: info.coin.decimals, ) - estimatedFee; } // stupid + fragile double? _parseServerVersion(String version) { double? result; try { final list = version.split(" "); if (list.isNotEmpty) { final numberStrings = list.last.split("."); final major = numberStrings.removeAt(0); result = double.tryParse("$major.${numberStrings.join("")}"); } } catch (_) {} Logging.instance.log( "${info.name} _parseServerVersion($version) => $result", level: LogLevel.Info, ); return result; } // =========================================================================== }