import 'dart:async'; import 'dart:convert'; import 'dart:io'; import 'package:bech32/bech32.dart'; import 'package:bip32/bip32.dart' as bip32; import 'package:bip39/bip39.dart' as bip39; import 'package:bitcoindart/bitcoindart.dart'; import 'package:bitcoindart/bitcoindart.dart' as btc_dart; import 'package:bs58check/bs58check.dart' as bs58check; import 'package:decimal/decimal.dart'; import 'package:flutter/foundation.dart'; import 'package:isar/isar.dart'; import 'package:stackwallet/electrumx_rpc/cached_electrumx.dart'; import 'package:stackwallet/electrumx_rpc/electrumx.dart'; import 'package:stackwallet/models/balance.dart'; import 'package:stackwallet/models/isar/models/isar_models.dart' as isar_models; import 'package:stackwallet/models/paymint/fee_object_model.dart'; import 'package:stackwallet/services/coins/coin_paynym_extension.dart'; import 'package:stackwallet/services/coins/coin_service.dart'; import 'package:stackwallet/services/event_bus/events/global/node_connection_status_changed_event.dart'; import 'package:stackwallet/services/event_bus/events/global/refresh_percent_changed_event.dart'; import 'package:stackwallet/services/event_bus/events/global/updated_in_background_event.dart'; import 'package:stackwallet/services/event_bus/events/global/wallet_sync_status_changed_event.dart'; import 'package:stackwallet/services/event_bus/global_event_bus.dart'; import 'package:stackwallet/services/mixins/wallet_cache.dart'; import 'package:stackwallet/services/mixins/wallet_db.dart'; import 'package:stackwallet/services/node_service.dart'; import 'package:stackwallet/services/notifications_api.dart'; import 'package:stackwallet/services/transaction_notification_tracker.dart'; import 'package:stackwallet/utilities/address_utils.dart'; import 'package:stackwallet/utilities/assets.dart'; import 'package:stackwallet/utilities/constants.dart'; import 'package:stackwallet/utilities/default_nodes.dart'; import 'package:stackwallet/utilities/enums/coin_enum.dart'; import 'package:stackwallet/utilities/enums/fee_rate_type_enum.dart'; import 'package:stackwallet/utilities/flutter_secure_storage_interface.dart'; import 'package:stackwallet/utilities/format.dart'; import 'package:stackwallet/utilities/logger.dart'; import 'package:stackwallet/utilities/prefs.dart'; import 'package:tuple/tuple.dart'; import 'package:uuid/uuid.dart'; const int MINIMUM_CONFIRMATIONS = 1; const int DUST_LIMIT = 1000000; const String GENESIS_HASH_MAINNET = "1a91e3dace36e2be3bf030a65679fe821aa1d6ef92e7c9902eb318182c355691"; const String GENESIS_HASH_TESTNET = "bb0a78264637406b6360aad926284d544d7049f45189db5664f3c4d07350559e"; enum DerivePathType { bip44 } bip32.BIP32 getBip32Node(int chain, int index, String mnemonic, NetworkType network, DerivePathType derivePathType) { final root = getBip32Root(mnemonic, network); final node = getBip32NodeFromRoot(chain, index, root, derivePathType); return node; } /// wrapper for compute() bip32.BIP32 getBip32NodeWrapper( Tuple5 args, ) { return getBip32Node( args.item1, args.item2, args.item3, args.item4, args.item5, ); } bip32.BIP32 getBip32NodeFromRoot( int chain, int index, bip32.BIP32 root, DerivePathType derivePathType) { String coinType; switch (root.network.wif) { case 0x9e: // doge mainnet wif coinType = "3"; // doge mainnet break; case 0xf1: // doge testnet wif coinType = "1"; // doge testnet break; default: throw Exception("Invalid Dogecoin network type used!"); } switch (derivePathType) { case DerivePathType.bip44: return root.derivePath("m/44'/$coinType'/0'/$chain/$index"); default: throw Exception("DerivePathType must not be null."); } } /// wrapper for compute() bip32.BIP32 getBip32NodeFromRootWrapper( Tuple4 args, ) { return getBip32NodeFromRoot( args.item1, args.item2, args.item3, args.item4, ); } bip32.BIP32 getBip32Root(String mnemonic, NetworkType network) { final seed = bip39.mnemonicToSeed(mnemonic); final networkType = bip32.NetworkType( wif: network.wif, bip32: bip32.Bip32Type( public: network.bip32.public, private: network.bip32.private, ), ); final root = bip32.BIP32.fromSeed(seed, networkType); return root; } /// wrapper for compute() bip32.BIP32 getBip32RootWrapper(Tuple2 args) { return getBip32Root(args.item1, args.item2); } class DogecoinWallet extends CoinServiceAPI with WalletCache, WalletDB { static const integrationTestFlag = bool.fromEnvironment("IS_INTEGRATION_TEST"); final _prefs = Prefs.instance; Timer? timer; late final Coin _coin; late final TransactionNotificationTracker txTracker; NetworkType get network { switch (coin) { case Coin.dogecoin: return dogecoin; case Coin.dogecoinTestNet: return dogecointestnet; default: throw Exception("Dogecoin network type not set!"); } } @override Future> get utxos => isar.utxos.where().findAll(); @override Future> get transactions => isar.transactions.where().sortByTimestampDesc().findAll(); @override Coin get coin => _coin; @override Future get currentReceivingAddress async => (await _currentReceivingAddress).value; Future get _currentReceivingAddress async => (await isar.addresses .filter() .typeEqualTo(isar_models.AddressType.p2pkh) .subTypeEqualTo(isar_models.AddressSubType.receiving) .sortByDerivationIndexDesc() .findFirst())!; // @override Future get currentChangeAddress async => (await _currentChangeAddress).value; Future get _currentChangeAddress async => (await isar.addresses .filter() .typeEqualTo(isar_models.AddressType.p2pkh) .subTypeEqualTo(isar_models.AddressSubType.change) .sortByDerivationIndexDesc() .findFirst())!; @override Future exit() async { _hasCalledExit = true; timer?.cancel(); timer = null; stopNetworkAlivePinging(); await isarClose(); } bool _hasCalledExit = false; @override bool get hasCalledExit => _hasCalledExit; @override Future get fees => _feeObject ??= _getFees(); Future? _feeObject; @override Future get maxFee async { final fee = (await fees).fast; final satsFee = Format.satoshisToAmount(fee, coin: coin) * Decimal.fromInt(Constants.satsPerCoin(coin)); return satsFee.floor().toBigInt().toInt(); } @override Future> get mnemonic => _getMnemonicList(); Future get chainHeight async { try { final result = await _electrumXClient.getBlockHeadTip(); final height = result["height"] as int; await updateCachedChainHeight(height); return height; } catch (e, s) { Logging.instance.log("Exception caught in chainHeight: $e\n$s", level: LogLevel.Error); return storedChainHeight; } } @override int get storedChainHeight => getCachedChainHeight(); DerivePathType addressType({required String address}) { Uint8List? decodeBase58; Segwit? decodeBech32; try { decodeBase58 = bs58check.decode(address); } catch (err) { // Base58check decode fail } if (decodeBase58 != null) { if (decodeBase58[0] == network.pubKeyHash) { // P2PKH return DerivePathType.bip44; } throw ArgumentError('Invalid version or Network mismatch'); } else { try { decodeBech32 = segwit.decode(address); } catch (err) { // Bech32 decode fail } if (network.bech32 != decodeBech32!.hrp) { throw ArgumentError('Invalid prefix or Network mismatch'); } if (decodeBech32.version != 0) { throw ArgumentError('Invalid address version'); } } throw ArgumentError('$address has no matching Script'); } bool longMutex = false; @override Future recoverFromMnemonic({ required String mnemonic, required int maxUnusedAddressGap, required int maxNumberOfIndexesToCheck, required int height, }) async { longMutex = true; final start = DateTime.now(); try { Logging.instance.log("IS_INTEGRATION_TEST: $integrationTestFlag", level: LogLevel.Info); if (!integrationTestFlag) { final features = await electrumXClient.getServerFeatures(); Logging.instance.log("features: $features", level: LogLevel.Info); switch (coin) { case Coin.dogecoin: if (features['genesis_hash'] != GENESIS_HASH_MAINNET) { throw Exception("genesis hash does not match main net!"); } break; case Coin.dogecoinTestNet: if (features['genesis_hash'] != GENESIS_HASH_TESTNET) { throw Exception("genesis hash does not match test net!"); } break; default: throw Exception( "Attempted to generate a DogecoinWallet using a non dogecoin coin type: ${coin.name}"); } } // check to make sure we aren't overwriting a mnemonic // this should never fail if ((await _secureStore.read(key: '${_walletId}_mnemonic')) != null) { longMutex = false; throw Exception("Attempted to overwrite mnemonic on restore!"); } await _secureStore.write( key: '${_walletId}_mnemonic', value: mnemonic.trim()); await _recoverWalletFromBIP32SeedPhrase( mnemonic: mnemonic.trim(), maxUnusedAddressGap: maxUnusedAddressGap, maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck, ); } catch (e, s) { Logging.instance.log( "Exception rethrown from recoverFromMnemonic(): $e\n$s", level: LogLevel.Error); longMutex = false; rethrow; } longMutex = false; final end = DateTime.now(); Logging.instance.log( "$walletName recovery time: ${end.difference(start).inMilliseconds} millis", level: LogLevel.Info); } Future> _checkGaps( int maxNumberOfIndexesToCheck, int maxUnusedAddressGap, int txCountBatchSize, bip32.BIP32 root, DerivePathType type, int chain) async { List addressArray = []; int returningIndex = -1; Map> derivations = {}; int gapCounter = 0; for (int index = 0; index < maxNumberOfIndexesToCheck && gapCounter < 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 = {}; final Map receivingNodes = {}; for (int j = 0; j < txCountBatchSize; j++) { final node = await compute( getBip32NodeFromRootWrapper, Tuple4( chain, index + j, root, type, ), ); isar_models.Address address; switch (type) { case DerivePathType.bip44: final addressString = P2PKH( data: PaymentData(pubkey: node.publicKey), network: network) .data .address!; address = isar_models.Address() ..subType = chain == 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change ..type = isar_models.AddressType.p2pkh ..publicKey = node.publicKey ..value = addressString ..derivationIndex = index + j; break; default: throw Exception("No Path type $type exists"); } receivingNodes.addAll({ "${_id}_$j": { "node": node, "address": address, } }); txCountCallArgs.addAll({ "${_id}_$j": address.value, }); } // get address tx counts final counts = await _getBatchTxCount(addresses: txCountCallArgs); // check and add appropriate addresses for (int k = 0; k < txCountBatchSize; k++) { int count = counts["${_id}_$k"]!; if (count > 0) { final node = receivingNodes["${_id}_$k"]; final address = node["address"] as isar_models.Address; // add address to array addressArray.add(address); iterationsAddressArray.add(address.value); // set current index returningIndex = index + k; // reset counter gapCounter = 0; // add info to derivations derivations[address.value] = { "pubKey": Format.uint8listToString( (node["node"] as bip32.BIP32).publicKey), "wif": (node["node"] as bip32.BIP32).toWIF(), }; } // 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(iterationsAddressArray)); } return { "addressArray": addressArray, "index": returningIndex, "derivations": derivations }; } Future getTransactionCacheEarly(List allAddresses) async { try { final List> allTxHashes = await _fetchHistory(allAddresses); for (final txHash in allTxHashes) { try { unawaited(cachedElectrumXClient.getTransaction( txHash: txHash["tx_hash"] as String, verbose: true, coin: coin, )); } catch (e) { continue; } } } catch (e) { // } } Future _recoverWalletFromBIP32SeedPhrase({ required String mnemonic, int maxUnusedAddressGap = 20, int maxNumberOfIndexesToCheck = 1000, }) async { longMutex = true; Map> p2pkhReceiveDerivations = {}; Map> p2pkhChangeDerivations = {}; final root = await compute(getBip32RootWrapper, Tuple2(mnemonic, network)); List p2pkhReceiveAddressArray = []; int p2pkhReceiveIndex = -1; List p2pkhChangeAddressArray = []; int p2pkhChangeIndex = -1; // actual size is 12 due to p2pkh so 12x1 const txCountBatchSize = 12; try { // receiving addresses Logging.instance .log("checking receiving addresses...", level: LogLevel.Info); final resultReceive44 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip44, 0); Logging.instance .log("checking change addresses...", level: LogLevel.Info); // change addresses final resultChange44 = _checkGaps(maxNumberOfIndexesToCheck, maxUnusedAddressGap, txCountBatchSize, root, DerivePathType.bip44, 1); await Future.wait([ resultReceive44, resultChange44, ]); p2pkhReceiveAddressArray = (await resultReceive44)['addressArray'] as List; p2pkhReceiveIndex = (await resultReceive44)['index'] as int; p2pkhReceiveDerivations = (await resultReceive44)['derivations'] as Map>; p2pkhChangeAddressArray = (await resultChange44)['addressArray'] as List; p2pkhChangeIndex = (await resultChange44)['index'] as int; p2pkhChangeDerivations = (await resultChange44)['derivations'] as Map>; // save the derivations (if any) if (p2pkhReceiveDerivations.isNotEmpty) { await addDerivations( chain: 0, derivePathType: DerivePathType.bip44, derivationsToAdd: p2pkhReceiveDerivations); } if (p2pkhChangeDerivations.isNotEmpty) { await addDerivations( chain: 1, derivePathType: DerivePathType.bip44, derivationsToAdd: p2pkhChangeDerivations); } // If restoring a wallet that never received any funds, then set receivingArray manually // If we didn't do this, it'd store an empty array if (p2pkhReceiveIndex == -1) { final address = await _generateAddressForChain(0, 0, DerivePathType.bip44); p2pkhReceiveAddressArray.add(address); } // 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. if (p2pkhChangeIndex == -1) { final address = await _generateAddressForChain(1, 0, DerivePathType.bip44); p2pkhChangeAddressArray.add(address); } await isarInit(walletId); await isar.writeTxn(() async { await isar.addresses.putAll(p2pkhChangeAddressArray); await isar.addresses.putAll(p2pkhReceiveAddressArray); }); await _updateUTXOs(); await Future.wait([ updateCachedId(walletId), updateCachedIsFavorite(false), ]); longMutex = false; } catch (e, s) { Logging.instance.log( "Exception rethrown from _recoverWalletFromBIP32SeedPhrase(): $e\n$s", level: LogLevel.Info); longMutex = false; rethrow; } } Future refreshIfThereIsNewData() async { if (longMutex) return false; if (_hasCalledExit) return false; Logging.instance.log("refreshIfThereIsNewData", level: LogLevel.Info); try { bool needsRefresh = false; Logging.instance.log( "notified unconfirmed transactions: ${txTracker.pendings}", level: LogLevel.Info); Set txnsToCheck = {}; for (final String txid in txTracker.pendings) { if (!txTracker.wasNotifiedConfirmed(txid)) { txnsToCheck.add(txid); } } for (String txid in txnsToCheck) { final txn = await electrumXClient.getTransaction(txHash: txid); int confirmations = txn["confirmations"] as int? ?? 0; bool isUnconfirmed = confirmations < MINIMUM_CONFIRMATIONS; if (!isUnconfirmed) { // unconfirmedTxs = {}; needsRefresh = true; break; } } if (!needsRefresh) { final allOwnAddresses = await _fetchAllOwnAddresses(); List> allTxs = await _fetchHistory( allOwnAddresses.map((e) => e.value).toList(growable: false)); for (Map transaction in allTxs) { final txid = transaction['tx_hash'] as String; if ((await isar.transactions .filter() .txidMatches(txid) .findFirst()) == null) { Logging.instance.log( " txid not found in address history already ${transaction['tx_hash']}", level: LogLevel.Info); needsRefresh = true; break; } } } return needsRefresh; } catch (e, s) { Logging.instance.log( "Exception caught in refreshIfThereIsNewData: $e\n$s", level: LogLevel.Info); rethrow; } } Future getAllTxsToWatch() async { if (_hasCalledExit) return; List unconfirmedTxnsToNotifyPending = []; List unconfirmedTxnsToNotifyConfirmed = []; final currentChainHeight = await chainHeight; final txCount = await isar.transactions.count(); const paginateLimit = 50; for (int i = 0; i < txCount; i += paginateLimit) { final transactions = await isar.transactions .where() .offset(i) .limit(paginateLimit) .findAll(); for (final tx in transactions) { if (tx.isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS)) { if (txTracker.wasNotifiedPending(tx.txid) && !txTracker.wasNotifiedConfirmed(tx.txid)) { unconfirmedTxnsToNotifyConfirmed.add(tx); } } else { if (!txTracker.wasNotifiedPending(tx.txid)) { unconfirmedTxnsToNotifyPending.add(tx); } } } } // notify on new incoming transaction for (final tx in unconfirmedTxnsToNotifyPending) { final confirmations = tx.getConfirmations(currentChainHeight); if (tx.type == isar_models.TransactionType.incoming) { unawaited(NotificationApi.showNotification( title: "Incoming transaction", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.now(), shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS, coinName: coin.name, txid: tx.txid, confirmations: confirmations, requiredConfirmations: MINIMUM_CONFIRMATIONS, )); await txTracker.addNotifiedPending(tx.txid); } else if (tx.type == isar_models.TransactionType.outgoing) { unawaited(NotificationApi.showNotification( title: "Sending transaction", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000), shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS, coinName: coin.name, txid: tx.txid, confirmations: confirmations, requiredConfirmations: MINIMUM_CONFIRMATIONS, )); await txTracker.addNotifiedPending(tx.txid); } } // notify on confirmed for (final tx in unconfirmedTxnsToNotifyConfirmed) { if (tx.type == isar_models.TransactionType.incoming) { unawaited(NotificationApi.showNotification( title: "Incoming transaction confirmed", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.now(), shouldWatchForUpdates: false, coinName: coin.name, )); await txTracker.addNotifiedConfirmed(tx.txid); } else if (tx.type == isar_models.TransactionType.outgoing) { unawaited(NotificationApi.showNotification( title: "Outgoing transaction confirmed", body: walletName, walletId: walletId, iconAssetName: Assets.svg.iconFor(coin: coin), date: DateTime.now(), shouldWatchForUpdates: false, coinName: coin.name, )); await txTracker.addNotifiedConfirmed(tx.txid); } } } bool refreshMutex = false; bool _shouldAutoSync = false; @override bool get shouldAutoSync => _shouldAutoSync; @override set shouldAutoSync(bool shouldAutoSync) { if (_shouldAutoSync != shouldAutoSync) { _shouldAutoSync = shouldAutoSync; if (!shouldAutoSync) { timer?.cancel(); timer = null; stopNetworkAlivePinging(); } else { startNetworkAlivePinging(); refresh(); } } } //TODO Show percentages properly/more consistently /// Refreshes display data for the wallet @override Future refresh() async { if (refreshMutex) { Logging.instance.log("$walletId $walletName refreshMutex denied", level: LogLevel.Info); return; } else { refreshMutex = true; } try { GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.syncing, walletId, coin, ), ); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.0, walletId)); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.1, walletId)); final currentHeight = await chainHeight; const storedHeight = 1; //await storedChainHeight; Logging.instance .log("chain height: $currentHeight", level: LogLevel.Info); Logging.instance .log("cached height: $storedHeight", level: LogLevel.Info); if (currentHeight != storedHeight) { GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.2, walletId)); await checkChangeAddressForTransactions(); GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.3, walletId)); await _checkCurrentReceivingAddressesForTransactions(); final fetchFuture = _refreshTransactions(); final utxosRefreshFuture = _updateUTXOs(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.50, walletId)); final feeObj = _getFees(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.60, walletId)); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.70, walletId)); _feeObject = Future(() => feeObj); await utxosRefreshFuture; GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.80, walletId)); await fetchFuture; await getAllTxsToWatch(); GlobalEventBus.instance .fire(RefreshPercentChangedEvent(0.90, walletId)); } GlobalEventBus.instance.fire(RefreshPercentChangedEvent(1.0, walletId)); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.synced, walletId, coin, ), ); refreshMutex = false; if (shouldAutoSync) { timer ??= Timer.periodic(const Duration(seconds: 30), (timer) async { // chain height check currently broken // if ((await chainHeight) != (await storedChainHeight)) { if (await refreshIfThereIsNewData()) { await refresh(); GlobalEventBus.instance.fire(UpdatedInBackgroundEvent( "New data found in $walletId $walletName in background!", walletId)); } // } }); } } catch (error, strace) { refreshMutex = false; GlobalEventBus.instance.fire( NodeConnectionStatusChangedEvent( NodeConnectionStatus.disconnected, walletId, coin, ), ); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.unableToSync, walletId, coin, ), ); Logging.instance.log( "Caught exception in refreshWalletData(): $error\n$strace", level: LogLevel.Error); } } @override Future> prepareSend({ required String address, required int satoshiAmount, Map? args, }) async { try { final feeRateType = args?["feeRate"]; final feeRateAmount = args?["feeRateAmount"]; 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; } rate = fee; } else { rate = feeRateAmount as int; } // check for send all bool isSendAll = false; if (satoshiAmount == balance.spendable) { isSendAll = true; } final result = await coinSelection(satoshiAmount, rate, address, isSendAll); Logging.instance.log("SEND RESULT: $result", level: LogLevel.Info); if (result is int) { switch (result) { case 1: throw Exception("Insufficient balance!"); case 2: throw Exception("Insufficient funds to pay for transaction fee!"); default: throw Exception("Transaction failed with error code $result"); } } else { final hex = result["hex"]; if (hex is String) { final fee = result["fee"] as int; final vSize = result["vSize"] as int; Logging.instance.log("txHex: $hex", level: LogLevel.Info); Logging.instance.log("fee: $fee", level: LogLevel.Info); Logging.instance.log("vsize: $vSize", level: LogLevel.Info); // fee should never be less than vSize sanity check if (fee < vSize) { throw Exception( "Error in fee calculation: Transaction fee cannot be less than vSize"); } return result as Map; } else { throw Exception("sent hex is not a String!!!"); } } } 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 confirmSend({dynamic txData}) async { try { Logging.instance.log("confirmSend txData: $txData", level: LogLevel.Info); final txHash = await _electrumXClient.broadcastTransaction( rawTx: txData["hex"] as String); Logging.instance.log("Sent txHash: $txHash", level: LogLevel.Info); return txHash; } catch (e, s) { Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s", level: LogLevel.Error); rethrow; } } @override Future testNetworkConnection() async { try { final result = await _electrumXClient.ping(); return result; } catch (_) { return false; } } Timer? _networkAliveTimer; void startNetworkAlivePinging() { // call once on start right away _periodicPingCheck(); // then periodically check _networkAliveTimer = Timer.periodic( Constants.networkAliveTimerDuration, (_) async { _periodicPingCheck(); }, ); } void _periodicPingCheck() async { bool hasNetwork = await testNetworkConnection(); _isConnected = hasNetwork; if (_isConnected != hasNetwork) { NodeConnectionStatus status = hasNetwork ? NodeConnectionStatus.connected : NodeConnectionStatus.disconnected; GlobalEventBus.instance .fire(NodeConnectionStatusChangedEvent(status, walletId, coin)); } } void stopNetworkAlivePinging() { _networkAliveTimer?.cancel(); _networkAliveTimer = null; } bool _isConnected = false; @override bool get isConnected => _isConnected; @override Future initializeNew() async { Logging.instance .log("Generating new ${coin.prettyName} wallet.", level: LogLevel.Info); if (getCachedId() != null) { throw Exception( "Attempted to initialize a new wallet using an existing wallet ID!"); } await _prefs.init(); try { await _generateNewWallet(); } catch (e, s) { Logging.instance.log("Exception rethrown from initializeNew(): $e\n$s", level: LogLevel.Fatal); rethrow; } await Future.wait([ updateCachedId(walletId), updateCachedIsFavorite(false), ]); } @override Future initializeExisting() async { Logging.instance.log("Opening existing ${coin.prettyName} wallet.", level: LogLevel.Info); if (getCachedId() == null) { throw Exception( "Attempted to initialize an existing wallet using an unknown wallet ID!"); } await _prefs.init(); await isarInit(walletId); } // hack to add tx to txData before refresh completes // required based on current app architecture where we don't properly store // transactions locally in a good way @override Future updateSentCachedTxData(Map txData) async { // final priceData = // await _priceAPI.getPricesAnd24hChange(baseCurrency: _prefs.currency); // Decimal currentPrice = priceData[coin]?.item1 ?? Decimal.zero; // final locale = // Platform.isWindows ? "en_US" : await Devicelocale.currentLocale; // final String worthNow = Format.localizedStringAsFixed( // value: // ((currentPrice * Decimal.fromInt(txData["recipientAmt"] as int)) / // Decimal.fromInt(Constants.satsPerCoin(coin))) // .toDecimal(scaleOnInfinitePrecision: 2), // decimalPlaces: 2, // locale: locale!); // // final tx = models.Transaction( // txid: txData["txid"] as String, // confirmedStatus: false, // timestamp: DateTime.now().millisecondsSinceEpoch ~/ 1000, // txType: "Sent", // amount: txData["recipientAmt"] as int, // worthNow: worthNow, // worthAtBlockTimestamp: worthNow, // fees: txData["fee"] as int, // inputSize: 0, // outputSize: 0, // inputs: [], // outputs: [], // address: txData["address"] as String, // height: -1, // confirmations: 0, // ); // // if (cachedTxData == null) { // final data = await _fetchTransactionData(); // _transactionData = Future(() => data); // } // // final transactions = cachedTxData!.getAllTransactions(); // transactions[tx.txid] = tx; // cachedTxData = models.TransactionData.fromMap(transactions); // _transactionData = Future(() => cachedTxData!); } @override bool validateAddress(String address) { return btc_dart.Address.validateAddress(address, network); } @override String get walletId => _walletId; late final String _walletId; @override String get walletName => _walletName; late String _walletName; // setter for updating on rename @override set walletName(String newName) => _walletName = newName; late ElectrumX _electrumXClient; ElectrumX get electrumXClient => _electrumXClient; late CachedElectrumX _cachedElectrumXClient; CachedElectrumX get cachedElectrumXClient => _cachedElectrumXClient; late SecureStorageInterface _secureStore; DogecoinWallet({ required String walletId, required String walletName, required Coin coin, required ElectrumX client, required CachedElectrumX cachedClient, required TransactionNotificationTracker tracker, required SecureStorageInterface secureStore, }) { txTracker = tracker; _walletId = walletId; _walletName = walletName; _coin = coin; _electrumXClient = client; _cachedElectrumXClient = cachedClient; _secureStore = secureStore; initCache(walletId, coin); } @override Future updateNode(bool shouldRefresh) async { final failovers = NodeService(secureStorageInterface: _secureStore) .failoverNodesFor(coin: coin) .map((e) => ElectrumXNode( address: e.host, port: e.port, name: e.name, id: e.id, useSSL: e.useSSL, )) .toList(); final newNode = await getCurrentNode(); _cachedElectrumXClient = CachedElectrumX.from( node: newNode, prefs: _prefs, failovers: failovers, ); _electrumXClient = ElectrumX.from( node: newNode, prefs: _prefs, failovers: failovers, ); if (shouldRefresh) { unawaited(refresh()); } } Future> _getMnemonicList() async { final mnemonicString = await _secureStore.read(key: '${_walletId}_mnemonic'); if (mnemonicString == null) { return []; } final List data = mnemonicString.split(' '); return data; } Future getCurrentNode() async { final node = NodeService(secureStorageInterface: _secureStore) .getPrimaryNodeFor(coin: coin) ?? DefaultNodes.getNodeFor(coin); return ElectrumXNode( address: node.host, port: node.port, name: node.name, useSSL: node.useSSL, id: node.id, ); } Future> _fetchAllOwnAddresses() async { final allAddresses = await isar.addresses .filter() .subTypeEqualTo(isar_models.AddressSubType.receiving) .or() .subTypeEqualTo(isar_models.AddressSubType.change) .findAll(); return allAddresses; } Future _getFees() async { try { //TODO adjust numbers for different speeds? 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: Format.decimalAmountToSatoshis(fast, coin), medium: Format.decimalAmountToSatoshis(medium, coin), slow: Format.decimalAmountToSatoshis(slow, coin), ); Logging.instance.log("fetched fees: $feeObject", level: LogLevel.Info); return feeObject; } catch (e) { Logging.instance .log("Exception rethrown from _getFees(): $e", level: LogLevel.Error); rethrow; } } Future _generateNewWallet() async { Logging.instance .log("IS_INTEGRATION_TEST: $integrationTestFlag", level: LogLevel.Info); if (!integrationTestFlag) { try { final features = await electrumXClient .getServerFeatures() .timeout(const Duration(seconds: 3)); Logging.instance.log("features: $features", level: LogLevel.Info); switch (coin) { case Coin.dogecoin: if (features['genesis_hash'] != GENESIS_HASH_MAINNET) { throw Exception("genesis hash does not match main net!"); } break; case Coin.dogecoinTestNet: if (features['genesis_hash'] != GENESIS_HASH_TESTNET) { throw Exception("genesis hash does not match test net!"); } break; default: throw Exception( "Attempted to generate a BitcoinWallet using a non bitcoin coin type: ${coin.name}"); } } catch (e, s) { Logging.instance.log("$e/n$s", level: LogLevel.Info); } } // this should never fail if ((await _secureStore.read(key: '${_walletId}_mnemonic')) != null) { throw Exception( "Attempted to overwrite mnemonic on generate new wallet!"); } await _secureStore.write( key: '${_walletId}_mnemonic', value: bip39.generateMnemonic(strength: 256)); // Generate and add addresses final initialReceivingAddressP2PKH = await _generateAddressForChain(0, 0, DerivePathType.bip44); final initialChangeAddressP2PKH = await _generateAddressForChain(1, 0, DerivePathType.bip44); await isarInit(walletId); await isar.writeTxn(() async { await isar.addresses.putAll([ initialReceivingAddressP2PKH, initialChangeAddressP2PKH, ]); }); Logging.instance.log("_generateNewWalletFinished", level: LogLevel.Info); } /// Generates a new internal or external chain address for the wallet using a BIP44 derivation path. /// [chain] - Use 0 for receiving (external), 1 for change (internal). Should not be any other value! /// [index] - This can be any integer >= 0 Future _generateAddressForChain( int chain, int index, DerivePathType derivePathType, ) async { final mnemonic = await _secureStore.read(key: '${_walletId}_mnemonic'); final node = await compute( getBip32NodeWrapper, Tuple5( chain, index, mnemonic!, network, derivePathType, ), ); final data = PaymentData(pubkey: node.publicKey); String address; switch (derivePathType) { case DerivePathType.bip44: address = P2PKH(data: data, network: network).data.address!; break; // default: // // should never hit this due to all enum cases handled // return null; } // add generated address & info to derivations await addDerivation( chain: chain, address: address, pubKey: Format.uint8listToString(node.publicKey), wif: node.toWIF(), derivePathType: derivePathType, ); return isar_models.Address() ..derivationIndex = index ..value = address ..publicKey = node.publicKey ..type = isar_models.AddressType.p2pkh ..subType = chain == 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change; } /// Returns the latest receiving/change (external/internal) address for the wallet depending on [chain] /// and /// [chain] - Use 0 for receiving (external), 1 for change (internal). Should not be any other value! Future _getCurrentAddressForChain( int chain, DerivePathType derivePathType, ) async { final subType = chain == 0 // Here, we assume that chain == 1 if it isn't 0 ? isar_models.AddressSubType.receiving : isar_models.AddressSubType.change; isar_models.Address? address; switch (derivePathType) { case DerivePathType.bip44: address = await isar.addresses .filter() .typeEqualTo(isar_models.AddressType.p2pkh) .subTypeEqualTo(subType) .sortByDerivationIndexDesc() .findFirst(); break; } return address!.value; } String _buildDerivationStorageKey( {required int chain, required DerivePathType derivePathType}) { String key; String chainId = chain == 0 ? "receive" : "change"; switch (derivePathType) { case DerivePathType.bip44: key = "${walletId}_${chainId}DerivationsP2PKH"; break; } return key; } Future> _fetchDerivations( {required int chain, required DerivePathType derivePathType}) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); return Map.from( jsonDecode(derivationsString ?? "{}") as Map); } /// Add a single derivation to the local secure storage for [chain] and /// [derivePathType] where [chain] must either be 1 for change or 0 for receive. /// This will overwrite a previous entry where the address of the new derivation /// matches a derivation currently stored. Future addDerivation({ required int chain, required String address, required String pubKey, required String wif, required DerivePathType derivePathType, }) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); final derivations = Map.from(jsonDecode(derivationsString ?? "{}") as Map); // add derivation derivations[address] = { "pubKey": pubKey, "wif": wif, }; // save derivations final newReceiveDerivationsString = jsonEncode(derivations); await _secureStore.write(key: key, value: newReceiveDerivationsString); } /// Add multiple derivations to the local secure storage for [chain] and /// [derivePathType] where [chain] must either be 1 for change or 0 for receive. /// This will overwrite any previous entries where the address of the new derivation /// matches a derivation currently stored. /// The [derivationsToAdd] must be in the format of: /// { /// addressA : { /// "pubKey": , /// "wif": , /// }, /// addressB : { /// "pubKey": , /// "wif": , /// }, /// } Future addDerivations({ required int chain, required DerivePathType derivePathType, required Map derivationsToAdd, }) async { // build lookup key final key = _buildDerivationStorageKey( chain: chain, derivePathType: derivePathType); // fetch current derivations final derivationsString = await _secureStore.read(key: key); final derivations = Map.from(jsonDecode(derivationsString ?? "{}") as Map); // add derivation derivations.addAll(derivationsToAdd); // save derivations final newReceiveDerivationsString = jsonEncode(derivations); await _secureStore.write(key: key, value: newReceiveDerivationsString); } Future>> fastFetch(List allTxHashes) async { List> allTransactions = []; const futureLimit = 30; List>> transactionFutures = []; int currentFutureCount = 0; for (final txHash in allTxHashes) { Future> transactionFuture = cachedElectrumXClient.getTransaction( txHash: txHash, verbose: true, coin: coin, ); transactionFutures.add(transactionFuture); currentFutureCount++; if (currentFutureCount > futureLimit) { currentFutureCount = 0; await Future.wait(transactionFutures); for (final fTx in transactionFutures) { final tx = await fTx; allTransactions.add(tx); } } } if (currentFutureCount != 0) { currentFutureCount = 0; await Future.wait(transactionFutures); for (final fTx in transactionFutures) { final tx = await fTx; allTransactions.add(tx); } } return allTransactions; } Future _updateUTXOs() async { final allAddresses = await _fetchAllOwnAddresses(); try { final fetchedUtxoList = >>[]; final Map>> batches = {}; const batchSizeMax = 100; int batchNumber = 0; for (int i = 0; i < allAddresses.length; i++) { if (batches[batchNumber] == null) { batches[batchNumber] = {}; } final scripthash = AddressUtils.convertToScriptHash(allAddresses[i].value, network); 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); } } } final currentChainHeight = await chainHeight; final List outputArray = []; int satoshiBalanceTotal = 0; int satoshiBalancePending = 0; int satoshiBalanceSpendable = 0; int satoshiBalanceBlocked = 0; for (int i = 0; i < fetchedUtxoList.length; i++) { for (int j = 0; j < fetchedUtxoList[i].length; j++) { final txn = await cachedElectrumXClient.getTransaction( txHash: fetchedUtxoList[i][j]["tx_hash"] as String, verbose: true, coin: coin, ); final utxo = isar_models.UTXO(); utxo.txid = txn["txid"] as String; utxo.vout = fetchedUtxoList[i][j]["tx_pos"] as int; utxo.value = fetchedUtxoList[i][j]["value"] as int; utxo.name = ""; // todo check here if we should mark as blocked utxo.isBlocked = false; utxo.blockedReason = null; utxo.isCoinbase = txn["is_coinbase"] as bool? ?? false; utxo.blockHash = txn["blockhash"] as String?; utxo.blockHeight = fetchedUtxoList[i][j]["height"] as int?; utxo.blockTime = txn["blocktime"] as int?; satoshiBalanceTotal += utxo.value; if (utxo.isBlocked) { satoshiBalanceBlocked += utxo.value; } else { if (utxo.isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS)) { satoshiBalanceSpendable += utxo.value; } else { satoshiBalancePending += utxo.value; } } outputArray.add(utxo); } } Logging.instance .log('Outputs fetched: $outputArray', level: LogLevel.Info); await isar.writeTxn(() async { await isar.utxos.clear(); await isar.utxos.putAll(outputArray); }); // finally update balance _balance = Balance( coin: coin, total: satoshiBalanceTotal, spendable: satoshiBalanceSpendable, blockedTotal: satoshiBalanceBlocked, pendingSpendable: satoshiBalancePending, ); await updateCachedBalance(_balance!); } catch (e, s) { Logging.instance .log("Output fetch unsuccessful: $e\n$s", level: LogLevel.Error); } } @override Balance get balance => _balance ??= getCachedBalance(); Balance? _balance; // /// Takes in a list of UtxoObjects and adds a name (dependent on object index within list) // /// and checks for the txid associated with the utxo being blocked and marks it accordingly. // /// Now also checks for output labeling. // Future _sortOutputs(List utxos) async { // final blockedHashArray = // DB.instance.get(boxName: walletId, key: 'blocked_tx_hashes') // as List?; // final List lst = []; // if (blockedHashArray != null) { // for (var hash in blockedHashArray) { // lst.add(hash as String); // } // } // final labels = // DB.instance.get(boxName: walletId, key: 'labels') as Map? ?? // {}; // // outputsList = []; // // for (var i = 0; i < utxos.length; i++) { // if (labels[utxos[i].txid] != null) { // utxos[i].txName = labels[utxos[i].txid] as String? ?? ""; // } else { // utxos[i].txName = 'Output #$i'; // } // // if (utxos[i].status.confirmed == false) { // outputsList.add(utxos[i]); // } else { // if (lst.contains(utxos[i].txid)) { // utxos[i].blocked = true; // outputsList.add(utxos[i]); // } else if (!lst.contains(utxos[i].txid)) { // outputsList.add(utxos[i]); // } // } // } // } Future getTxCount({required String address}) async { String? scripthash; try { scripthash = AddressUtils.convertToScriptHash(address, network); final transactions = await electrumXClient.getHistory(scripthash: scripthash); return transactions.length; } catch (e) { Logging.instance.log( "Exception rethrown in _getTxCount(address: $address, scripthash: $scripthash): $e", level: LogLevel.Error); rethrow; } } Future> _getBatchTxCount({ required Map addresses, }) async { try { final Map> args = {}; for (final entry in addresses.entries) { args[entry.key] = [ AddressUtils.convertToScriptHash(entry.value, network) ]; } 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 _checkReceivingAddressForTransactions() async { try { final currentReceiving = await _currentReceivingAddress; final int txCount = await getTxCount(address: currentReceiving.value); Logging.instance.log( 'Number of txs for current receiving address $currentReceiving: $txCount', level: LogLevel.Info); if (txCount >= 1) { // First increment the receiving index final newReceivingIndex = currentReceiving.derivationIndex + 1; // Use new index to derive a new receiving address final newReceivingAddress = await _generateAddressForChain( 0, newReceivingIndex, DerivePathType.bip44); // Add that new receiving address await isar.writeTxn(() async { await isar.addresses.put(newReceivingAddress); }); } } on SocketException catch (se, s) { Logging.instance.log( "SocketException caught in _checkReceivingAddressForTransactions($DerivePathType.bip44): $se\n$s", level: LogLevel.Error); return; } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkReceivingAddressForTransactions($DerivePathType.bip44): $e\n$s", level: LogLevel.Error); rethrow; } } Future checkChangeAddressForTransactions() async { try { final currentChange = await _currentChangeAddress; final int txCount = await getTxCount(address: currentChange.value); Logging.instance.log( 'Number of txs for current change address $currentChange: $txCount', level: LogLevel.Info); if (txCount >= 1) { // First increment the change index final newChangeIndex = currentChange.derivationIndex + 1; // Use new index to derive a new change address final newChangeAddress = await _generateAddressForChain( 1, newChangeIndex, DerivePathType.bip44); // Add that new change address await isar.writeTxn(() async { await isar.addresses.put(newChangeAddress); }); } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkChangeAddressForTransactions(${DerivePathType.bip44}): $e\n$s", level: LogLevel.Error); rethrow; } } Future _checkCurrentReceivingAddressesForTransactions() async { try { // for (final type in DerivePathType.values) { await _checkReceivingAddressForTransactions(); // } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkCurrentReceivingAddressesForTransactions(): $e\n$s", level: LogLevel.Info); rethrow; } } /// public wrapper because dart can't test private... Future checkCurrentReceivingAddressesForTransactions() async { if (Platform.environment["FLUTTER_TEST"] == "true") { try { return _checkCurrentReceivingAddressesForTransactions(); } catch (_) { rethrow; } } } Future _checkCurrentChangeAddressesForTransactions() async { try { // for (final type in DerivePathType.values) { await checkChangeAddressForTransactions(); // } } catch (e, s) { Logging.instance.log( "Exception rethrown from _checkCurrentChangeAddressesForTransactions(): $e\n$s", level: LogLevel.Error); rethrow; } } /// public wrapper because dart can't test private... Future checkCurrentChangeAddressesForTransactions() async { if (Platform.environment["FLUTTER_TEST"] == "true") { try { return _checkCurrentChangeAddressesForTransactions(); } catch (_) { rethrow; } } } Future>> _fetchHistory( List allAddresses) async { try { List> allTxHashes = []; 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 = AddressUtils.convertToScriptHash(allAddresses[i], network); final id = Logger.isTestEnv ? "$i" : const Uuid().v1(); requestIdToAddressMap[id] = allAddresses[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]); } } } } return allTxHashes; } catch (e, s) { Logging.instance.log("_fetchHistory: $e\n$s", level: LogLevel.Error); rethrow; } } bool _duplicateTxCheck( List> allTransactions, String txid) { for (int i = 0; i < allTransactions.length; i++) { if (allTransactions[i]["txid"] == txid) { return true; } } return false; } // Future migrate() async { // final receivingAddressesP2PKH = DB.instance.get( // boxName: walletId, key: 'receivingAddressesP2PKH') as List; // // final changeAddressesP2PKH = // DB.instance.get(boxName: walletId, key: 'changeAddressesP2PKH') // as List; // // await isar.writeTxn(() async { // for (var i = 0; i < receivingAddressesP2PKH.length; i++) { // await isar.address.put( // isar_models.Address() // ..type = isar_models.AddressType.p2pkh // ..subType = isar_models.AddressSubType.receiving // ..publicKey = [] // ..derivationIndex = i // ..value = receivingAddressesP2PKH[i] as String, // ); // } // for (var i = 0; i < changeAddressesP2PKH.length; i++) { // await isar.address.put( // isar_models.Address() // ..type = isar_models.AddressType.p2pkh // ..subType = isar_models.AddressSubType.change // ..publicKey = [] // ..derivationIndex = i // ..value = changeAddressesP2PKH[i] as String, // ); // } // }); // // await DB.instance.put( // boxName: walletId, key: "receivingAddressesP2PKH", value: []); // await DB.instance.put( // boxName: walletId, key: "changeAddressesP2PKH", value: []); // } Future _refreshTransactions() async { final List allAddresses = await _fetchAllOwnAddresses(); final List> allTxHashes = await _fetchHistory(allAddresses.map((e) => e.value).toList()); List hashes = allTxHashes.map((e) => e['tx_hash'] as String).toList(growable: false); await fastFetch(hashes); List> allTransactions = []; for (final txHash in allTxHashes) { final tx = await cachedElectrumXClient.getTransaction( txHash: txHash["tx_hash"] as String, verbose: true, coin: coin, ); if (!_duplicateTxCheck(allTransactions, tx["txid"] as String)) { tx["address"] = txHash["address"]; tx["height"] = txHash["height"]; allTransactions.add(tx); } } Set vHashes = {}; for (final txObject in allTransactions) { for (int i = 0; i < (txObject["vin"] as List).length; i++) { final input = txObject["vin"]![i] as Map; final prevTxid = input["txid"] as String; vHashes.add(prevTxid); } } await fastFetch(vHashes.toList()); for (final txObject in allTransactions) { final txn = await parseTransaction( txObject, cachedElectrumXClient, allAddresses, coin, MINIMUM_CONFIRMATIONS, ); // final tx = await isar.transactions // .filter() // .txidMatches(midSortedTx.txid) // .findFirst(); // // we don't need to check this but it saves a write tx instead of overwriting the transaction in Isar // if (tx == null) { await isar.writeTxn(() async { await isar.transactions.put(txn); }); // } } } int estimateTxFee({required int vSize, required int feeRatePerKB}) { return vSize * (feeRatePerKB / 1000).ceil(); } /// The coinselection algorithm decides whether or not the user is eligible to make the transaction /// with [satoshiAmountToSend] and [selectedTxFeeRate]. If so, it will call buildTrasaction() and return /// a map containing the tx hex along with other important information. If not, then it will return /// an integer (1 or 2) dynamic coinSelection( int satoshiAmountToSend, int selectedTxFeeRate, String _recipientAddress, bool isSendAll, { int additionalOutputs = 0, List? utxos, }) async { Logging.instance .log("Starting coinSelection ----------", level: LogLevel.Info); final List availableOutputs = utxos ?? await this.utxos; final currentChainHeight = await chainHeight; final List spendableOutputs = []; int spendableSatoshiValue = 0; // Build list of spendable outputs and totaling their satoshi amount for (var i = 0; i < availableOutputs.length; i++) { if (availableOutputs[i].isBlocked == false && availableOutputs[i] .isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS) == true) { spendableOutputs.add(availableOutputs[i]); spendableSatoshiValue += availableOutputs[i].value; } } // 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("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; // 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) { 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 = []; 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; } Logging.instance .log("satoshisBeingUsed: $satoshisBeingUsed", level: LogLevel.Info); Logging.instance .log("inputsBeingConsumed: $inputsBeingConsumed", level: LogLevel.Info); Logging.instance .log('utxoObjectsToUse: $utxoObjectsToUse', level: LogLevel.Info); Logging.instance .log('satoshiAmountToSend $satoshiAmountToSend', 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 $coin", level: LogLevel.Info); final int vSizeForOneOutput = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [_recipientAddress], satoshiAmounts: [satoshisBeingUsed - 1], ))["vSize"] as int; int feeForOneOutput = estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); if (feeForOneOutput < (vSizeForOneOutput + 1) * 1000) { feeForOneOutput = (vSizeForOneOutput + 1) * 1000; } final int amount = satoshiAmountToSend - feeForOneOutput; dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: [amount], ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": amount, "fee": feeForOneOutput, "vSize": txn["vSize"], }; return transactionObject; } final int vSizeForOneOutput = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [_recipientAddress], satoshiAmounts: [satoshisBeingUsed - 1], ))["vSize"] as int; final int vSizeForTwoOutPuts = (await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: [ _recipientAddress, await _getCurrentAddressForChain(1, DerivePathType.bip44), ], satoshiAmounts: [ satoshiAmountToSend, satoshisBeingUsed - satoshiAmountToSend - 1, ], // dust limit is the minimum amount a change output should be ))["vSize"] as int; //todo: check if print needed debugPrint("vSizeForOneOutput $vSizeForOneOutput"); debugPrint("vSizeForTwoOutPuts $vSizeForTwoOutPuts"); // Assume 1 output, only for recipient and no change var feeForOneOutput = estimateTxFee( vSize: vSizeForOneOutput, feeRatePerKB: selectedTxFeeRate, ); // Assume 2 outputs, one for recipient and one for change var feeForTwoOutputs = estimateTxFee( vSize: vSizeForTwoOutPuts, feeRatePerKB: selectedTxFeeRate, ); Logging.instance .log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info); Logging.instance .log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info); if (feeForOneOutput < (vSizeForOneOutput + 1) * 1000) { feeForOneOutput = (vSizeForOneOutput + 1) * 1000; } if (feeForTwoOutputs < ((vSizeForTwoOutPuts + 1) * 1000)) { feeForTwoOutputs = ((vSizeForTwoOutPuts + 1) * 1000); } Logging.instance .log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info); Logging.instance .log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info); if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput) { if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput + DUST_LIMIT) { // 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 > 546 satoshis, we perform the mechanics required to properly generate and use a new // change address. if (changeOutputSize > DUST_LIMIT && satoshisBeingUsed - satoshiAmountToSend - changeOutputSize == feeForTwoOutputs) { // generate new change address if current change address has been used await checkChangeAddressForTransactions(); final String newChangeAddress = await _getCurrentAddressForChain(1, DerivePathType.bip44); 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); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); // make sure minimum fee is accurate if that is being used if (txn["vSize"] - feeBeingPaid == 1) { int changeOutputSize = satoshisBeingUsed - satoshiAmountToSend - (txn["vSize"] as int); 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 = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); } Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": feeBeingPaid, "vSize": txn["vSize"], }; return transactionObject; } else { // Something went wrong here. It either overshot or undershot the estimated fee amount or the changeOutputSize // is smaller than or equal to [DUST_LIMIT]. 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); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": satoshisBeingUsed - satoshiAmountToSend, "vSize": txn["vSize"], }; return transactionObject; } } else { // No additional outputs needed since adding one would mean that it'd be smaller than 546 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); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": satoshisBeingUsed - satoshiAmountToSend, "vSize": txn["vSize"], }; return transactionObject; } } 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); dynamic txn = await buildTransaction( utxosToUse: utxoObjectsToUse, utxoSigningData: utxoSigningData, recipients: recipientsArray, satoshiAmounts: recipientsAmtArray, ); Map transactionObject = { "hex": txn["hex"], "recipient": recipientsArray[0], "recipientAmt": recipientsAmtArray[0], "fee": feeForOneOutput, "vSize": txn["vSize"], }; return transactionObject; } else { // Remember that returning 2 iTndicates 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(satoshiAmountToSend, selectedTxFeeRate, _recipientAddress, isSendAll, additionalOutputs: additionalOutputs + 1, utxos: utxos); } return 2; } } Future> fetchBuildTxData( List utxosToUse, ) async { // return data Map results = {}; Map> addressTxid = {}; // addresses to check List addressesP2PKH = []; try { // Populating the addresses to check for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; final tx = await _cachedElectrumXClient.getTransaction( txHash: txid, coin: coin, ); for (final output in tx["vout"] as List) { final n = output["n"]; if (n != null && n == utxosToUse[i].vout) { final address = output["scriptPubKey"]["addresses"][0] as String; if (!addressTxid.containsKey(address)) { addressTxid[address] = []; } (addressTxid[address] as List).add(txid); switch (addressType(address: address)) { case DerivePathType.bip44: addressesP2PKH.add(address); break; } } } } // p2pkh / bip44 final p2pkhLength = addressesP2PKH.length; if (p2pkhLength > 0) { final receiveDerivations = await _fetchDerivations( chain: 0, derivePathType: DerivePathType.bip44, ); final changeDerivations = await _fetchDerivations( chain: 1, derivePathType: DerivePathType.bip44, ); for (int i = 0; i < p2pkhLength; i++) { // receives final receiveDerivation = receiveDerivations[addressesP2PKH[i]]; // if a match exists it will not be null if (receiveDerivation != null) { final data = P2PKH( data: PaymentData( pubkey: Format.stringToUint8List( receiveDerivation["pubKey"] as String)), network: network, ).data; for (String tx in addressTxid[addressesP2PKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( receiveDerivation["wif"] as String, network: network, ), }; } } else { // if its not a receive, check change final changeDerivation = changeDerivations[addressesP2PKH[i]]; // if a match exists it will not be null if (changeDerivation != null) { final data = P2PKH( data: PaymentData( pubkey: Format.stringToUint8List( changeDerivation["pubKey"] as String)), network: network, ).data; for (String tx in addressTxid[addressesP2PKH[i]]!) { results[tx] = { "output": data.output, "keyPair": ECPair.fromWIF( changeDerivation["wif"] as String, network: network, ), }; } } } } } return results; } catch (e, s) { Logging.instance .log("fetchBuildTxData() threw: $e,\n$s", level: LogLevel.Error); rethrow; } } /// Builds and signs a transaction Future> buildTransaction({ required List utxosToUse, required Map utxoSigningData, required List recipients, required List satoshiAmounts, }) async { Logging.instance .log("Starting buildTransaction ----------", level: LogLevel.Info); final txb = TransactionBuilder(network: network); txb.setVersion(1); // Add transaction inputs for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; txb.addInput(txid, utxosToUse[i].vout, null, utxoSigningData[txid]["output"] as Uint8List); } // Add transaction output for (var i = 0; i < recipients.length; i++) { txb.addOutput(recipients[i], satoshiAmounts[i]); } try { // Sign the transaction accordingly for (var i = 0; i < utxosToUse.length; i++) { final txid = utxosToUse[i].txid; txb.sign( vin: i, keyPair: utxoSigningData[txid]["keyPair"] as ECPair, witnessValue: utxosToUse[i].value, redeemScript: utxoSigningData[txid]["redeemScript"] as Uint8List?, ); } } 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 {"hex": builtTx.toHex(), "vSize": vSize}; } @override Future fullRescan( int maxUnusedAddressGap, int maxNumberOfIndexesToCheck, ) async { Logging.instance.log("Starting full rescan!", level: LogLevel.Info); longMutex = true; GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.syncing, walletId, coin, ), ); // clear cache await _cachedElectrumXClient.clearSharedTransactionCache(coin: coin); // back up data // await _rescanBackup(); try { final mnemonic = await _secureStore.read(key: '${_walletId}_mnemonic'); await _recoverWalletFromBIP32SeedPhrase( mnemonic: mnemonic!, maxUnusedAddressGap: maxUnusedAddressGap, maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck, ); longMutex = false; Logging.instance.log("Full rescan complete!", level: LogLevel.Info); GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.synced, walletId, coin, ), ); } catch (e, s) { GlobalEventBus.instance.fire( WalletSyncStatusChangedEvent( WalletSyncStatus.unableToSync, walletId, coin, ), ); // restore from backup // await _rescanRestore(); longMutex = false; Logging.instance.log("Exception rethrown from fullRescan(): $e\n$s", level: LogLevel.Error); rethrow; } } // Future _rescanRestore() async { // Logging.instance.log("starting rescan restore", level: LogLevel.Info); // // // restore from backup // // p2pkh // final tempReceivingAddressesP2PKH = DB.instance // .get(boxName: walletId, key: 'receivingAddressesP2PKH_BACKUP'); // final tempChangeAddressesP2PKH = DB.instance // .get(boxName: walletId, key: 'changeAddressesP2PKH_BACKUP'); // final tempReceivingIndexP2PKH = DB.instance // .get(boxName: walletId, key: 'receivingIndexP2PKH_BACKUP'); // final tempChangeIndexP2PKH = DB.instance // .get(boxName: walletId, key: 'changeIndexP2PKH_BACKUP'); // await DB.instance.put( // boxName: walletId, // key: 'receivingAddressesP2PKH', // value: tempReceivingAddressesP2PKH); // await DB.instance.put( // boxName: walletId, // key: 'changeAddressesP2PKH', // value: tempChangeAddressesP2PKH); // await DB.instance.put( // boxName: walletId, // key: 'receivingIndexP2PKH', // value: tempReceivingIndexP2PKH); // await DB.instance.put( // boxName: walletId, // key: 'changeIndexP2PKH', // value: tempChangeIndexP2PKH); // await DB.instance.delete( // key: 'receivingAddressesP2PKH_BACKUP', boxName: walletId); // await DB.instance // .delete(key: 'changeAddressesP2PKH_BACKUP', boxName: walletId); // await DB.instance // .delete(key: 'receivingIndexP2PKH_BACKUP', boxName: walletId); // await DB.instance // .delete(key: 'changeIndexP2PKH_BACKUP', boxName: walletId); // // // P2PKH derivations // final p2pkhReceiveDerivationsString = await _secureStore.read( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP"); // final p2pkhChangeDerivationsString = await _secureStore.read( // key: "${walletId}_changeDerivationsP2PKH_BACKUP"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2PKH", // value: p2pkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2PKH", // value: p2pkhChangeDerivationsString); // // await _secureStore.delete( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH_BACKUP"); // // // UTXOs // final utxoData = DB.instance // .get(boxName: walletId, key: 'latest_utxo_model_BACKUP'); // await DB.instance.put( // boxName: walletId, key: 'latest_utxo_model', value: utxoData); // await DB.instance // .delete(key: 'latest_utxo_model_BACKUP', boxName: walletId); // // Logging.instance.log("rescan restore complete", level: LogLevel.Info); // } // // Future _rescanBackup() async { // Logging.instance.log("starting rescan backup", level: LogLevel.Info); // // // backup current and clear data // // p2pkh // final tempReceivingAddressesP2PKH = DB.instance // .get(boxName: walletId, key: 'receivingAddressesP2PKH'); // await DB.instance.put( // boxName: walletId, // key: 'receivingAddressesP2PKH_BACKUP', // value: tempReceivingAddressesP2PKH); // await DB.instance // .delete(key: 'receivingAddressesP2PKH', boxName: walletId); // // final tempChangeAddressesP2PKH = DB.instance // .get(boxName: walletId, key: 'changeAddressesP2PKH'); // await DB.instance.put( // boxName: walletId, // key: 'changeAddressesP2PKH_BACKUP', // value: tempChangeAddressesP2PKH); // await DB.instance // .delete(key: 'changeAddressesP2PKH', boxName: walletId); // // final tempReceivingIndexP2PKH = // DB.instance.get(boxName: walletId, key: 'receivingIndexP2PKH'); // await DB.instance.put( // boxName: walletId, // key: 'receivingIndexP2PKH_BACKUP', // value: tempReceivingIndexP2PKH); // await DB.instance // .delete(key: 'receivingIndexP2PKH', boxName: walletId); // // final tempChangeIndexP2PKH = // DB.instance.get(boxName: walletId, key: 'changeIndexP2PKH'); // await DB.instance.put( // boxName: walletId, // key: 'changeIndexP2PKH_BACKUP', // value: tempChangeIndexP2PKH); // await DB.instance // .delete(key: 'changeIndexP2PKH', boxName: walletId); // // // P2PKH derivations // final p2pkhReceiveDerivationsString = // await _secureStore.read(key: "${walletId}_receiveDerivationsP2PKH"); // final p2pkhChangeDerivationsString = // await _secureStore.read(key: "${walletId}_changeDerivationsP2PKH"); // // await _secureStore.write( // key: "${walletId}_receiveDerivationsP2PKH_BACKUP", // value: p2pkhReceiveDerivationsString); // await _secureStore.write( // key: "${walletId}_changeDerivationsP2PKH_BACKUP", // value: p2pkhChangeDerivationsString); // // await _secureStore.delete(key: "${walletId}_receiveDerivationsP2PKH"); // await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH"); // // // UTXOs // final utxoData = // DB.instance.get(boxName: walletId, key: 'latest_utxo_model'); // await DB.instance.put( // boxName: walletId, key: 'latest_utxo_model_BACKUP', value: utxoData); // await DB.instance // .delete(key: 'latest_utxo_model', boxName: walletId); // // Logging.instance.log("rescan backup complete", level: LogLevel.Info); // } @override set isFavorite(bool markFavorite) { _isFavorite = markFavorite; updateCachedIsFavorite(markFavorite); } @override bool get isFavorite => _isFavorite ??= getCachedIsFavorite(); bool? _isFavorite; @override bool get isRefreshing => refreshMutex; bool isActive = false; @override void Function(bool)? get onIsActiveWalletChanged => (isActive) => this.isActive = isActive; @override Future estimateFeeFor(int satoshiAmount, int feeRate) async { final available = balance.spendable; if (available == satoshiAmount) { return satoshiAmount - (await sweepAllEstimate(feeRate)); } else if (satoshiAmount <= 0 || satoshiAmount > available) { return roughFeeEstimate(1, 2, feeRate); } int runningBalance = 0; int inputCount = 0; for (final output in (await utxos)) { if (!output.isBlocked) { runningBalance += output.value; inputCount++; if (runningBalance > satoshiAmount) { break; } } } final oneOutPutFee = roughFeeEstimate(inputCount, 1, feeRate); final twoOutPutFee = roughFeeEstimate(inputCount, 2, feeRate); if (runningBalance - satoshiAmount > oneOutPutFee) { if (runningBalance - satoshiAmount > oneOutPutFee + DUST_LIMIT) { final change = runningBalance - satoshiAmount - twoOutPutFee; if (change > DUST_LIMIT && runningBalance - satoshiAmount - change == twoOutPutFee) { return runningBalance - satoshiAmount - change; } else { return runningBalance - satoshiAmount; } } else { return runningBalance - satoshiAmount; } } else if (runningBalance - satoshiAmount == oneOutPutFee) { return oneOutPutFee; } else { return twoOutPutFee; } } // TODO: correct formula for doge? int roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) { return ((181 * inputCount) + (34 * outputCount) + 10) * (feeRatePerKB / 1000).ceil(); } Future sweepAllEstimate(int feeRate) async { int available = 0; int inputCount = 0; for (final output in (await utxos)) { if (!output.isBlocked && output.isConfirmed(storedChainHeight, MINIMUM_CONFIRMATIONS)) { available += output.value; inputCount++; } } // transaction will only have 1 output minus the fee final estimatedFee = roughFeeEstimate(inputCount, 1, feeRate); return available - estimatedFee; } @override Future generateNewAddress() async { try { final currentReceiving = await _currentReceivingAddress; final newReceivingIndex = currentReceiving.derivationIndex + 1; // Use new index to derive a new receiving address final newReceivingAddress = await _generateAddressForChain( 0, newReceivingIndex, DerivePathType.bip44); // Add that new receiving address await isar.writeTxn(() async { await isar.addresses.put(newReceivingAddress); }); return true; } catch (e, s) { Logging.instance.log( "Exception rethrown from generateNewAddress(): $e\n$s", level: LogLevel.Error); return false; } } @override Isar get isarInstance => isar; } // Dogecoin Network final dogecoin = NetworkType( messagePrefix: '\x18Dogecoin Signed Message:\n', bech32: 'bc', bip32: Bip32Type(public: 0x02facafd, private: 0x02fac398), pubKeyHash: 0x1e, scriptHash: 0x16, wif: 0x9e); final dogecointestnet = NetworkType( messagePrefix: '\x18Dogecoin Signed Message:\n', bech32: 'tb', bip32: Bip32Type(public: 0x043587cf, private: 0x04358394), pubKeyHash: 0x71, scriptHash: 0xc4, wif: 0xf1);