stack_wallet/lib/services/coins/bitcoincash/bitcoincash_wallet.dart

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/*
* This file is part of Stack Wallet.
*
* Copyright (c) 2023 Cypher Stack
* All Rights Reserved.
* The code is distributed under GPLv3 license, see LICENSE file for details.
* Generated by Cypher Stack on 2023-05-26
*
*/
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import 'dart:async';
import 'dart:convert';
import 'dart:io';
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import 'dart:math';
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import 'package:bech32/bech32.dart';
import 'package:bip32/bip32.dart' as bip32;
import 'package:bip39/bip39.dart' as bip39;
import 'package:bitbox/bitbox.dart' as bitbox;
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import 'package:bitcoindart/bitcoindart.dart';
import 'package:bs58check/bs58check.dart' as bs58check;
import 'package:decimal/decimal.dart';
import 'package:flutter/foundation.dart';
import 'package:isar/isar.dart';
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import 'package:stackwallet/db/isar/main_db.dart';
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import 'package:stackwallet/electrumx_rpc/cached_electrumx.dart';
import 'package:stackwallet/electrumx_rpc/electrumx.dart';
import 'package:stackwallet/models/balance.dart';
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import 'package:stackwallet/models/isar/models/blockchain_data/address.dart';
import 'package:stackwallet/models/isar/models/isar_models.dart' as isar_models;
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import 'package:stackwallet/models/paymint/fee_object_model.dart';
import 'package:stackwallet/models/signing_data.dart';
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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/coin_control_interface.dart';
import 'package:stackwallet/services/mixins/fusion_interface.dart';
import 'package:stackwallet/services/mixins/wallet_cache.dart';
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import 'package:stackwallet/services/mixins/wallet_db.dart';
import 'package:stackwallet/services/mixins/xpubable.dart';
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import 'package:stackwallet/services/node_service.dart';
import 'package:stackwallet/services/transaction_notification_tracker.dart';
import 'package:stackwallet/utilities/address_utils.dart';
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import 'package:stackwallet/utilities/amount/amount.dart';
import 'package:stackwallet/utilities/bip32_utils.dart';
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import 'package:stackwallet/utilities/constants.dart';
import 'package:stackwallet/utilities/default_nodes.dart';
import 'package:stackwallet/utilities/enums/coin_enum.dart';
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import 'package:stackwallet/utilities/enums/derive_path_type_enum.dart';
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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';
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import 'package:stackwallet/widgets/crypto_notifications.dart';
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import 'package:tuple/tuple.dart';
import 'package:uuid/uuid.dart';
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const int MINIMUM_CONFIRMATIONS = 0;
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final Amount DUST_LIMIT = Amount(
rawValue: BigInt.from(546),
fractionDigits: Coin.particl.decimals,
);
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const String GENESIS_HASH_MAINNET =
"000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f";
const String GENESIS_HASH_TESTNET =
"000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943";
String constructDerivePath({
required DerivePathType derivePathType,
required int networkWIF,
int account = 0,
required int chain,
required int index,
}) {
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int coinType;
switch (networkWIF) {
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case 0x80: // bch mainnet wif
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switch (derivePathType) {
case DerivePathType.bip44:
coinType = 145; // bch mainnet
break;
case DerivePathType.bch44: // bitcoin.com wallet specific
coinType = 0; // bch mainnet
break;
default:
throw Exception(
"DerivePathType $derivePathType not supported for coinType");
}
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break;
case 0xef: // bch testnet wif
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coinType = 1; // bch testnet
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break;
default:
throw Exception("Invalid Bitcoincash network wif used!");
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}
int purpose;
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switch (derivePathType) {
case DerivePathType.bip44:
case DerivePathType.bch44:
purpose = 44;
break;
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default:
throw Exception("DerivePathType $derivePathType not supported");
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}
return "m/$purpose'/$coinType'/$account'/$chain/$index";
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}
class BitcoinCashWallet extends CoinServiceAPI
with WalletCache, WalletDB, CoinControlInterface, FusionInterface
implements XPubAble {
BitcoinCashWallet({
required String walletId,
required String walletName,
required Coin coin,
required ElectrumX client,
required CachedElectrumX cachedClient,
required TransactionNotificationTracker tracker,
required SecureStorageInterface secureStore,
MainDB? mockableOverride,
}) {
txTracker = tracker;
_walletId = walletId;
_walletName = walletName;
_coin = coin;
_electrumXClient = client;
_cachedElectrumXClient = cachedClient;
_secureStore = secureStore;
initCache(walletId, coin);
initWalletDB(mockableOverride: mockableOverride);
initFusionInterface(walletId: walletId, coin: coin, db: db);
initCoinControlInterface(
walletId: walletId,
walletName: walletName,
coin: coin,
db: db,
getChainHeight: () => chainHeight,
refreshedBalanceCallback: (balance) async {
_balance = balance;
await updateCachedBalance(_balance!);
},
);
}
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static const integrationTestFlag =
bool.fromEnvironment("IS_INTEGRATION_TEST");
final _prefs = Prefs.instance;
Timer? timer;
late final Coin _coin;
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late final TransactionNotificationTracker txTracker;
NetworkType get _network {
switch (coin) {
case Coin.bitcoincash:
return bitcoincash;
case Coin.bitcoincashTestnet:
return bitcoincashtestnet;
default:
throw Exception("Bitcoincash network type not set!");
}
}
@override
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Future<List<isar_models.UTXO>> get utxos => db.getUTXOs(walletId).findAll();
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@override
Future<List<isar_models.Transaction>> get transactions =>
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db.getTransactions(walletId).sortByTimestampDesc().findAll();
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@override
Coin get coin => _coin;
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@override
Future<String> get currentReceivingAddress async =>
(await _currentReceivingAddress).value;
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Future<isar_models.Address> get _currentReceivingAddress async =>
(await db
.getAddresses(walletId)
.filter()
.typeEqualTo(isar_models.AddressType.p2pkh)
.subTypeEqualTo(isar_models.AddressSubType.receiving)
.derivationPath((q) => q.not().valueStartsWith("m/44'/0'"))
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.sortByDerivationIndexDesc()
.findFirst()) ??
await _generateAddressForChain(0, 0, DerivePathTypeExt.primaryFor(coin));
Future<String> get currentChangeAddress async =>
(await _currentChangeAddress).value;
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Future<isar_models.Address> get _currentChangeAddress async =>
(await db
.getAddresses(walletId)
.filter()
.typeEqualTo(isar_models.AddressType.p2pkh)
.subTypeEqualTo(isar_models.AddressSubType.change)
.derivationPath((q) => q.not().valueStartsWith("m/44'/0'"))
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.sortByDerivationIndexDesc()
.findFirst()) ??
await _generateAddressForChain(1, 0, DerivePathTypeExt.primaryFor(coin));
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@override
Future<void> exit() async {
_hasCalledExit = true;
timer?.cancel();
timer = null;
stopNetworkAlivePinging();
}
bool _hasCalledExit = false;
@override
bool get hasCalledExit => _hasCalledExit;
@override
Future<FeeObject> get fees => _feeObject ??= _getFees();
Future<FeeObject>? _feeObject;
@override
Future<int> get maxFee async {
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throw UnimplementedError("Not used in bch");
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}
@override
Future<List<String>> get mnemonic => _getMnemonicList();
@override
Future<String?> get mnemonicString =>
_secureStore.read(key: '${_walletId}_mnemonic');
@override
Future<String?> get mnemonicPassphrase => _secureStore.read(
key: '${_walletId}_mnemonicPassphrase',
);
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Future<int> get chainHeight async {
try {
final result = await _electrumXClient.getBlockHeadTip();
final height = result["height"] as int;
await updateCachedChainHeight(height);
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if (height > storedChainHeight) {
GlobalEventBus.instance.fire(
UpdatedInBackgroundEvent(
"Updated current chain height in $walletId $walletName!",
walletId,
),
);
}
return height;
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} catch (e, s) {
Logging.instance.log("Exception caught in chainHeight: $e\n$s",
level: LogLevel.Error);
return storedChainHeight;
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}
}
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@override
int get storedChainHeight => getCachedChainHeight();
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DerivePathType addressType({required String address}) {
Uint8List? decodeBase58;
Segwit? decodeBech32;
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try {
if (bitbox.Address.detectFormat(address) ==
bitbox.Address.formatCashAddr) {
if (validateCashAddr(address)) {
address = bitbox.Address.toLegacyAddress(address);
} else {
throw ArgumentError('$address is not currently supported');
}
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}
} catch (_) {
// invalid cash addr format
}
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try {
decodeBase58 = bs58check.decode(address);
} catch (err) {
// Base58check decode fail
}
if (decodeBase58 != null) {
if (decodeBase58[0] == _network.pubKeyHash) {
// P2PKH
return DerivePathType.bip44;
}
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throw ArgumentError('Invalid version or Network mismatch');
} else {
try {
decodeBech32 = segwit.decode(address);
} catch (err) {
// Bech32 decode fail
}
if (decodeBech32 != null) {
if (_network.bech32 != decodeBech32.hrp) {
throw ArgumentError('Invalid prefix or Network mismatch');
}
if (decodeBech32.version != 0) {
throw ArgumentError('Invalid address version');
}
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}
}
throw ArgumentError('$address has no matching Script');
}
bool longMutex = false;
@override
Future<void> recoverFromMnemonic({
required String mnemonic,
String? mnemonicPassphrase,
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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.bitcoincash:
if (features['genesis_hash'] != GENESIS_HASH_MAINNET) {
throw Exception("genesis hash does not match main net!");
}
break;
case Coin.bitcoincashTestnet:
if (features['genesis_hash'] != GENESIS_HASH_TESTNET) {
throw Exception("genesis hash does not match test net!");
}
break;
default:
throw Exception(
"Attempted to generate a BitcoinCashWallet using a non bch coin type: ${coin.name}");
}
}
// check to make sure we aren't overwriting a mnemonic
// this should never fail
if ((await mnemonicString) != null ||
(await this.mnemonicPassphrase) != null) {
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longMutex = false;
throw Exception("Attempted to overwrite mnemonic on restore!");
}
await _secureStore.write(
key: '${_walletId}_mnemonic', value: mnemonic.trim());
await _secureStore.write(
key: '${_walletId}_mnemonicPassphrase',
value: mnemonicPassphrase ?? "",
);
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await _recoverWalletFromBIP32SeedPhrase(
mnemonic: mnemonic.trim(),
mnemonicPassphrase: mnemonicPassphrase ?? "",
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maxUnusedAddressGap: maxUnusedAddressGap,
maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck,
coin: coin,
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);
} 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);
}
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Future<Tuple3<List<isar_models.Address>, DerivePathType, int>> _checkGaps(
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int maxNumberOfIndexesToCheck,
int maxUnusedAddressGap,
int txCountBatchSize,
bip32.BIP32 root,
DerivePathType type,
int chain,
) async {
List<isar_models.Address> addressArray = [];
int gapCounter = 0;
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int highestIndexWithHistory = 0;
for (int index = 0;
index < maxNumberOfIndexesToCheck && gapCounter < maxUnusedAddressGap;
index += txCountBatchSize) {
List<String> iterationsAddressArray = [];
Logging.instance.log(
"index: $index, \t GapCounter $chain ${type.name}: $gapCounter",
level: LogLevel.Info);
final _id = "k_$index";
Map<String, String> txCountCallArgs = {};
for (int j = 0; j < txCountBatchSize; j++) {
final derivePath = constructDerivePath(
derivePathType: type,
networkWIF: root.network.wif,
chain: chain,
index: index + j,
);
final node = await Bip32Utils.getBip32NodeFromRoot(root, derivePath);
String addressString;
final data = PaymentData(pubkey: node.publicKey);
isar_models.AddressType addrType;
switch (type) {
case DerivePathType.bip44:
case DerivePathType.bch44:
addressString = P2PKH(data: data, network: _network).data.address!;
addrType = isar_models.AddressType.p2pkh;
addressString = bitbox.Address.toCashAddress(addressString);
break;
default:
throw Exception("DerivePathType $type not supported");
}
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final address = isar_models.Address(
walletId: walletId,
value: addressString,
publicKey: node.publicKey,
type: addrType,
derivationIndex: index + j,
derivationPath: isar_models.DerivationPath()..value = derivePath,
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subType: chain == 0
? isar_models.AddressSubType.receiving
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: isar_models.AddressSubType.change,
);
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addressArray.add(address);
txCountCallArgs.addAll({
"${_id}_$j": addressString,
});
}
// get address tx counts
final counts = await _getBatchTxCount(addresses: txCountCallArgs);
if (kDebugMode) {
print("Counts $counts");
}
// check and add appropriate addresses
for (int k = 0; k < txCountBatchSize; k++) {
int count = counts["${_id}_$k"]!;
if (count > 0) {
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iterationsAddressArray.add(txCountCallArgs["${_id}_$k"]!);
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// 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(iterationsAddressArray));
}
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return Tuple3(addressArray, type, highestIndexWithHistory);
}
Future<void> getTransactionCacheEarly(List<String> allAddresses) async {
try {
final List<Map<String, dynamic>> 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) {
//
}
}
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Future<void> _recoverWalletFromBIP32SeedPhrase({
required String mnemonic,
required String mnemonicPassphrase,
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int maxUnusedAddressGap = 20,
int maxNumberOfIndexesToCheck = 1000,
bool isRescan = false,
Coin? coin,
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}) async {
longMutex = true;
final root = await Bip32Utils.getBip32Root(
mnemonic,
mnemonicPassphrase,
_network,
);
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final deriveTypes = [
DerivePathType.bip44,
];
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if (coin != Coin.bitcoincashTestnet) {
deriveTypes.add(DerivePathType.bch44);
}
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final List<Future<Tuple3<List<isar_models.Address>, DerivePathType, int>>>
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receiveFutures = [];
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final List<Future<Tuple3<List<isar_models.Address>, DerivePathType, int>>>
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changeFutures = [];
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const receiveChain = 0;
const changeChain = 1;
const indexZero = 0;
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// actual size is 24 due to p2pkh and p2sh so 12x2
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const txCountBatchSize = 12;
try {
// receiving addresses
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Logging.instance.log(
"checking receiving addresses...",
level: LogLevel.Info,
);
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for (final type in deriveTypes) {
receiveFutures.add(
_checkGaps(
maxNumberOfIndexesToCheck,
maxUnusedAddressGap,
txCountBatchSize,
root,
type,
receiveChain,
),
);
}
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// change addresses
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Logging.instance.log(
"checking change addresses...",
level: LogLevel.Info,
);
for (final type in deriveTypes) {
changeFutures.add(
_checkGaps(
maxNumberOfIndexesToCheck,
maxUnusedAddressGap,
txCountBatchSize,
root,
type,
changeChain,
),
);
}
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// io limitations may require running these linearly instead
final futuresResult = await Future.wait([
Future.wait(receiveFutures),
Future.wait(changeFutures),
]);
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final receiveResults = futuresResult[0];
final changeResults = futuresResult[1];
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final List<isar_models.Address> addressesToStore = [];
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int highestReceivingIndexWithHistory = 0;
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// 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
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for (final tuple in receiveResults) {
if (tuple.item1.isEmpty) {
final address = await _generateAddressForChain(
receiveChain,
indexZero,
tuple.item2,
);
addressesToStore.add(address);
} else {
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highestReceivingIndexWithHistory = max(
tuple.item3,
highestReceivingIndexWithHistory,
);
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addressesToStore.addAll(tuple.item1);
}
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}
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int highestChangeIndexWithHistory = 0;
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// 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.
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for (final tuple in changeResults) {
if (tuple.item1.isEmpty) {
final address = await _generateAddressForChain(
changeChain,
indexZero,
tuple.item2,
);
addressesToStore.add(address);
} else {
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highestChangeIndexWithHistory = max(
tuple.item3,
highestChangeIndexWithHistory,
);
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addressesToStore.addAll(tuple.item1);
}
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}
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// remove extra addresses to help minimize risk of creating a large gap
addressesToStore.removeWhere((e) =>
e.subType == isar_models.AddressSubType.change &&
e.derivationIndex > highestChangeIndexWithHistory);
addressesToStore.removeWhere((e) =>
e.subType == isar_models.AddressSubType.receiving &&
e.derivationIndex > highestReceivingIndexWithHistory);
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if (isRescan) {
await db.updateOrPutAddresses(addressesToStore);
} else {
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await db.putAddresses(addressesToStore);
}
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await Future.wait([
_refreshTransactions(),
_updateUTXOs(),
]);
await Future.wait([
updateCachedId(walletId),
updateCachedIsFavorite(false),
]);
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longMutex = false;
} catch (e, s) {
Logging.instance.log(
"Exception rethrown from _recoverWalletFromBIP32SeedPhrase(): $e\n$s",
level: LogLevel.Info);
longMutex = false;
rethrow;
}
}
Future<bool> 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<String> 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);
var confirmations = txn["confirmations"];
if (confirmations is! int) continue;
bool isUnconfirmed = confirmations < MINIMUM_CONFIRMATIONS;
if (!isUnconfirmed) {
// unconfirmedTxs = {};
needsRefresh = true;
break;
}
}
if (!needsRefresh) {
var allOwnAddresses = await _fetchAllOwnAddresses();
List<Map<String, dynamic>> allTxs = await _fetchHistory(
allOwnAddresses.map((e) => e.value).toList(growable: false));
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for (Map<String, dynamic> transaction in allTxs) {
final txid = transaction['tx_hash'] as String;
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if ((await db
.getTransactions(walletId)
.filter()
.txidMatches(txid)
.findFirst()) ==
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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<void> getAllTxsToWatch() async {
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if (_hasCalledExit) return;
List<isar_models.Transaction> unconfirmedTxnsToNotifyPending = [];
List<isar_models.Transaction> unconfirmedTxnsToNotifyConfirmed = [];
final currentChainHeight = await chainHeight;
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final txCount = await db.getTransactions(walletId).count();
const paginateLimit = 50;
for (int i = 0; i < txCount; i += paginateLimit) {
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final transactions = await db
.getTransactions(walletId)
.offset(i)
.limit(paginateLimit)
.findAll();
for (final tx in transactions) {
if (tx.isConfirmed(currentChainHeight, MINIMUM_CONFIRMATIONS)) {
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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) {
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CryptoNotificationsEventBus.instance.fire(
CryptoNotificationEvent(
title: "Incoming transaction",
walletId: walletId,
date: DateTime.now(),
shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS,
txid: tx.txid,
confirmations: confirmations,
requiredConfirmations: MINIMUM_CONFIRMATIONS,
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walletName: walletName,
coin: coin,
),
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);
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await txTracker.addNotifiedPending(tx.txid);
} else if (tx.type == isar_models.TransactionType.outgoing) {
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CryptoNotificationsEventBus.instance.fire(
CryptoNotificationEvent(
title: "Sending transaction",
walletId: walletId,
date: DateTime.fromMillisecondsSinceEpoch(tx.timestamp * 1000),
shouldWatchForUpdates: confirmations < MINIMUM_CONFIRMATIONS,
txid: tx.txid,
confirmations: confirmations,
requiredConfirmations: MINIMUM_CONFIRMATIONS,
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walletName: walletName,
coin: coin,
),
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);
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await txTracker.addNotifiedPending(tx.txid);
}
}
// notify on confirmed
for (final tx in unconfirmedTxnsToNotifyConfirmed) {
if (tx.type == isar_models.TransactionType.incoming) {
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CryptoNotificationsEventBus.instance.fire(
CryptoNotificationEvent(
title: "Incoming transaction confirmed",
walletId: walletId,
date: DateTime.now(),
shouldWatchForUpdates: false,
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txid: tx.txid,
requiredConfirmations: MINIMUM_CONFIRMATIONS,
walletName: walletName,
coin: coin,
),
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);
await txTracker.addNotifiedConfirmed(tx.txid);
} else if (tx.type == isar_models.TransactionType.outgoing) {
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CryptoNotificationsEventBus.instance.fire(
CryptoNotificationEvent(
title: "Outgoing transaction confirmed",
walletId: walletId,
date: DateTime.now(),
shouldWatchForUpdates: false,
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txid: tx.txid,
requiredConfirmations: MINIMUM_CONFIRMATIONS,
walletName: walletName,
coin: coin,
),
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);
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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<void> 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();
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GlobalEventBus.instance.fire(RefreshPercentChangedEvent(0.3, walletId));
await _checkCurrentReceivingAddressesForTransactions();
final fetchFuture = _refreshTransactions();
final utxosRefreshFuture = _updateUTXOs();
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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;
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GlobalEventBus.instance
.fire(RefreshPercentChangedEvent(0.80, walletId));
await fetchFuture;
await getAllTxsToWatch();
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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: 150), (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<Map<String, dynamic>> prepareSend({
required String address,
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required Amount amount,
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Map<String, dynamic>? args,
}) async {
try {
final feeRateType = args?["feeRate"];
final customSatsPerVByte = args?["satsPerVByte"] as int?;
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final feeRateAmount = args?["feeRateAmount"];
final utxos = args?["UTXOs"] as Set<isar_models.UTXO>?;
if (customSatsPerVByte != null) {
// check for send all
bool isSendAll = false;
if (amount == balance.spendable) {
isSendAll = true;
}
final bool coinControl = utxos != null;
final result = await coinSelection(
satoshiAmountToSend: amount.raw.toInt(),
selectedTxFeeRate: -1,
satsPerVByte: customSatsPerVByte,
recipientAddress: address,
isSendAll: isSendAll,
utxos: utxos?.toList(),
coinControl: coinControl,
);
Logging.instance
.log("PREPARE 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<String, dynamic>;
} else {
throw Exception("sent hex is not a String!!!");
}
}
} else if (feeRateType is FeeRateType || feeRateAmount is int) {
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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");
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}
rate = fee;
} else {
rate = feeRateAmount as int;
}
// check for send all
bool isSendAll = false;
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if (amount == balance.spendable) {
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isSendAll = true;
}
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final bool coinControl = utxos != null;
final result = await coinSelection(
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satoshiAmountToSend: amount.raw.toInt(),
selectedTxFeeRate: rate,
recipientAddress: address,
isSendAll: isSendAll,
utxos: utxos?.toList(),
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coinControl: coinControl,
);
Logging.instance
.log("PREPARE SEND RESULT: $result", level: LogLevel.Info);
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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<String, dynamic>;
} 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<String> 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);
final utxos = txData["usedUTXOs"] as List<isar_models.UTXO>;
// mark utxos as used
await db.putUTXOs(utxos.map((e) => e.copyWith(used: true)).toList());
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return txHash;
} catch (e, s) {
Logging.instance.log("Exception rethrown from confirmSend(): $e\n$s",
level: LogLevel.Error);
rethrow;
}
}
@override
Future<bool> 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();
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if (_isConnected != hasNetwork) {
NodeConnectionStatus status = hasNetwork
? NodeConnectionStatus.connected
: NodeConnectionStatus.disconnected;
GlobalEventBus.instance
.fire(NodeConnectionStatusChangedEvent(status, walletId, coin));
_isConnected = hasNetwork;
if (hasNetwork) {
unawaited(refresh());
}
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}
}
void stopNetworkAlivePinging() {
_networkAliveTimer?.cancel();
_networkAliveTimer = null;
}
bool _isConnected = false;
@override
bool get isConnected => _isConnected;
@override
Future<void> initializeNew() async {
Logging.instance
.log("Generating new ${coin.prettyName} wallet.", level: LogLevel.Info);
if (getCachedId() != null) {
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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),
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]);
}
@override
Future<void> initializeExisting() async {
Logging.instance.log("initializeExisting() ${coin.prettyName} wallet.",
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level: LogLevel.Info);
if (getCachedId() == null) {
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throw Exception(
"Attempted to initialize an existing wallet using an unknown wallet ID!");
}
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await _prefs.init();
}
// 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<void> updateSentCachedTxData(Map<String, dynamic> txData) async {
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final transaction = isar_models.Transaction(
walletId: walletId,
txid: txData["txid"] as String,
timestamp: DateTime.now().millisecondsSinceEpoch ~/ 1000,
type: isar_models.TransactionType.outgoing,
subType: isar_models.TransactionSubType.none,
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// precision may be lost here hence the following amountString
amount: (txData["recipientAmt"] as Amount).raw.toInt(),
amountString: (txData["recipientAmt"] as Amount).toJsonString(),
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fee: txData["fee"] as int,
height: null,
isCancelled: false,
isLelantus: false,
otherData: null,
slateId: null,
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nonce: null,
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inputs: [],
outputs: [],
numberOfMessages: null,
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);
final address = txData["address"] is String
? await db.getAddress(walletId, txData["address"] as String)
: null;
await db.addNewTransactionData(
[
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Tuple2(transaction, address),
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],
walletId,
);
}
bool validateCashAddr(String cashAddr) {
String addr = cashAddr;
if (cashAddr.contains(":")) {
addr = cashAddr.split(":").last;
}
return addr.startsWith("q");
}
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@override
bool validateAddress(String address) {
try {
// 0 for bitcoincash: address scheme, 1 for legacy address
final format = bitbox.Address.detectFormat(address);
if (kDebugMode) {
print("format $format");
}
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if (_coin == Coin.bitcoincashTestnet) {
return true;
}
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if (format == bitbox.Address.formatCashAddr) {
return validateCashAddr(address);
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} else {
return address.startsWith("1");
}
} catch (e) {
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return false;
}
}
@override
String get walletId => _walletId;
late final String _walletId;
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@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;
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@override
Future<void> updateNode(bool shouldRefresh) async {
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final failovers = NodeService(secureStorageInterface: _secureStore)
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.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();
_electrumXClient = ElectrumX.from(
node: newNode,
prefs: _prefs,
failovers: failovers,
);
_cachedElectrumXClient = CachedElectrumX.from(
electrumXClient: _electrumXClient,
);
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if (shouldRefresh) {
unawaited(refresh());
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}
}
Future<List<String>> _getMnemonicList() async {
final _mnemonicString = await mnemonicString;
if (_mnemonicString == null) {
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return [];
}
final List<String> data = _mnemonicString.split(' ');
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return data;
}
Future<ElectrumXNode> getCurrentNode() async {
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final node = NodeService(secureStorageInterface: _secureStore)
.getPrimaryNodeFor(coin: coin) ??
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DefaultNodes.getNodeFor(coin);
return ElectrumXNode(
address: node.host,
port: node.port,
name: node.name,
useSSL: node.useSSL,
id: node.id,
);
}
Future<List<isar_models.Address>> _fetchAllOwnAddresses() async {
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final allAddresses = await db
.getAddresses(walletId)
.filter()
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.not()
.typeEqualTo(isar_models.AddressType.nonWallet)
.and()
.group((q) => q
.subTypeEqualTo(isar_models.AddressSubType.receiving)
.or()
.subTypeEqualTo(isar_models.AddressSubType.change))
.findAll();
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// for (var i = 0; i < receivingAddressesP2PKH.length; i++) {
// if (!allAddresses.contains(receivingAddressesP2PKH[i])) {
// allAddresses.add(receivingAddressesP2PKH[i] as String);
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// }
// }
// for (var i = 0; i < changeAddressesP2PKH.length; i++) {
// if (!allAddresses.contains(changeAddressesP2PKH[i])) {
// allAddresses.add(changeAddressesP2PKH[i] as String);
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// }
// }
return allAddresses;
}
Future<FeeObject> _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,
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fast: Amount.fromDecimal(
fast,
fractionDigits: coin.decimals,
).raw.toInt(),
medium: Amount.fromDecimal(
medium,
fractionDigits: coin.decimals,
).raw.toInt(),
slow: Amount.fromDecimal(
slow,
fractionDigits: coin.decimals,
).raw.toInt(),
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);
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<void> _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.bitcoincash:
if (features['genesis_hash'] != GENESIS_HASH_MAINNET) {
throw Exception("genesis hash does not match main net!");
}
break;
case Coin.bitcoincashTestnet:
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$s", level: LogLevel.Info);
}
}
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// this should never fail
if ((await mnemonicString) != null || (await mnemonicPassphrase) != null) {
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throw Exception(
"Attempted to overwrite mnemonic on generate new wallet!");
}
await _secureStore.write(
key: '${_walletId}_mnemonic',
value: bip39.generateMnemonic(strength: 128));
await _secureStore.write(key: '${_walletId}_mnemonicPassphrase', value: "");
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// Generate and add addresses to relevant arrays
final initialAddresses = await Future.wait([
// P2PKH
_generateAddressForChain(0, 0, DerivePathType.bip44),
_generateAddressForChain(1, 0, DerivePathType.bip44),
]);
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await db.putAddresses(initialAddresses);
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Logging.instance.log("_generateNewWalletFinished", level: LogLevel.Info);
}
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/// Generates a new internal or external chain address for the wallet using a BIP44 derivation path.
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/// [chain] - Use 0 for receiving (external), 1 for change (internal). Should not be any other value!
/// [index] - This can be any integer >= 0
Future<isar_models.Address> _generateAddressForChain(
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int chain,
int index,
DerivePathType derivePathType,
) async {
final _mnemonic = await mnemonicString;
final _mnemonicPassphrase = await mnemonicPassphrase;
if (_mnemonicPassphrase == null) {
Logging.instance.log(
"Exception in _generateAddressForChain: mnemonic passphrase null, possible migration issue; if using internal builds, delete wallet and restore from seed, if using a release build, please file bug report",
level: LogLevel.Error);
}
final derivePath = constructDerivePath(
derivePathType: derivePathType,
networkWIF: _network.wif,
chain: chain,
index: index,
);
final node = await Bip32Utils.getBip32Node(
_mnemonic!,
_mnemonicPassphrase!,
_network,
derivePath,
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);
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final data = PaymentData(pubkey: node.publicKey);
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String address;
isar_models.AddressType addrType;
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switch (derivePathType) {
case DerivePathType.bip44:
case DerivePathType.bch44:
address = P2PKH(data: data, network: _network).data.address!;
addrType = isar_models.AddressType.p2pkh;
address = bitbox.Address.toCashAddress(address);
break;
default:
throw Exception("DerivePathType $derivePathType not supported");
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}
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return isar_models.Address(
walletId: walletId,
value: address,
publicKey: node.publicKey,
type: addrType,
derivationIndex: index,
derivationPath: isar_models.DerivationPath()..value = derivePath,
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subType: chain == 0
? isar_models.AddressSubType.receiving
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: isar_models.AddressSubType.change,
);
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}
/// 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<String> _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.AddressType type;
String coinType;
String purpose;
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switch (derivePathType) {
case DerivePathType.bip44:
type = isar_models.AddressType.p2pkh;
coinType = coin == Coin.bitcoincash ? "145" : "1";
purpose = "44";
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break;
case DerivePathType.bch44:
type = isar_models.AddressType.p2pkh;
coinType = coin == Coin.bitcoincash ? "0" : "1";
purpose = "44";
break;
default:
throw Exception("DerivePathType $derivePathType not supported");
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}
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final address = await db
.getAddresses(walletId)
.filter()
.typeEqualTo(type)
.subTypeEqualTo(subType)
.derivationPath((q) => q.valueStartsWith("m/$purpose'/$coinType"))
.sortByDerivationIndexDesc()
.findFirst();
return address!.value;
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}
String _buildDerivationStorageKey({
required int chain,
required DerivePathType derivePathType,
}) {
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String key;
String chainId = chain == 0 ? "receive" : "change";
switch (derivePathType) {
case DerivePathType.bip44:
key = "${walletId}_${chainId}DerivationsP2PKH";
break;
case DerivePathType.bch44:
key = "${walletId}_${chainId}DerivationsBch44P2PKH";
break;
default:
throw UnsupportedError(
"${derivePathType.name} not supported by ${coin.prettyName}");
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}
return key;
}
Future<Map<String, dynamic>> _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<String, dynamic>.from(
jsonDecode(derivationsString ?? "{}") as Map);
}
Future<void> _updateUTXOs() async {
final allAddresses = await _fetchAllOwnAddresses();
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try {
final fetchedUtxoList = <List<Map<String, dynamic>>>[];
final Map<int, Map<String, List<dynamic>>> batches = {};
const batchSizeMax = 10;
int batchNumber = 0;
for (int i = 0; i < allAddresses.length; i++) {
if (batches[batchNumber] == null) {
batches[batchNumber] = {};
}
final scripthash =
_convertToScriptHash(allAddresses[i].value, _network);
if (kDebugMode) {
print("SCRIPT_HASH_FOR_ADDRESS ${allAddresses[i]} IS $scripthash");
}
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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 List<isar_models.UTXO> outputArray = [];
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for (int i = 0; i < fetchedUtxoList.length; i++) {
for (int j = 0; j < fetchedUtxoList[i].length; j++) {
final jsonUTXO = fetchedUtxoList[i][j];
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final txn = await cachedElectrumXClient.getTransaction(
txHash: jsonUTXO["tx_hash"] as String,
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verbose: true,
coin: coin,
);
final vout = jsonUTXO["tx_pos"] as int;
final outputs = txn["vout"] as List;
String? utxoOwnerAddress;
// get UTXO owner address
for (final output in outputs) {
if (output["n"] == vout) {
utxoOwnerAddress =
output["scriptPubKey"]?["addresses"]?[0] as String? ??
output["scriptPubKey"]?["address"] as String?;
}
}
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final utxo = isar_models.UTXO(
walletId: walletId,
txid: txn["txid"] as String,
vout: vout,
value: jsonUTXO["value"] as int,
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name: "",
isBlocked: false,
blockedReason: null,
isCoinbase: txn["is_coinbase"] as bool? ?? false,
blockHash: txn["blockhash"] as String?,
blockHeight: jsonUTXO["height"] as int?,
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blockTime: txn["blocktime"] as int?,
address: utxoOwnerAddress,
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);
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outputArray.add(utxo);
}
}
Logging.instance
.log('Outputs fetched: $outputArray', level: LogLevel.Info);
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await db.updateUTXOs(walletId, outputArray);
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// finally update balance
await _updateBalance();
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} catch (e, s) {
Logging.instance
.log("Output fetch unsuccessful: $e\n$s", level: LogLevel.Error);
}
}
Future<void> _updateBalance() async {
await refreshBalance();
}
@override
Balance get balance => _balance ??= getCachedBalance();
Balance? _balance;
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Future<int> getTxCount({required String address}) async {
String? scripthash;
try {
scripthash = _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<Map<String, int>> _getBatchTxCount({
required Map<String, String> addresses,
}) async {
try {
final Map<String, List<dynamic>> args = {};
if (kDebugMode) {
print("Address $addresses");
}
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for (final entry in addresses.entries) {
args[entry.key] = [_convertToScriptHash(entry.value, _network)];
}
if (kDebugMode) {
print("Args ${jsonEncode(args)}");
}
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final response = await electrumXClient.getBatchHistory(args: args);
if (kDebugMode) {
print("Response ${jsonEncode(response)}");
}
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final Map<String, int> result = {};
for (final entry in response.entries) {
result[entry.key] = entry.value.length;
}
if (kDebugMode) {
print("result ${jsonEncode(result)}");
}
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return result;
} catch (e, s) {
Logging.instance.log(
"Exception rethrown in _getBatchTxCount(address: $addresses: $e\n$s",
level: LogLevel.Error);
rethrow;
}
}
Future<void> _checkReceivingAddressForTransactions() async {
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try {
final currentReceiving = await _currentReceivingAddress;
final int txCount = await getTxCount(address: currentReceiving.value);
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Logging.instance.log(
'Number of txs for current receiving address $currentReceiving: $txCount',
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level: LogLevel.Info);
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if (txCount >= 1 || currentReceiving.derivationIndex < 0) {
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// First increment the receiving index
final newReceivingIndex = currentReceiving.derivationIndex + 1;
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// Use new index to derive a new receiving address
final newReceivingAddress = await _generateAddressForChain(
0, newReceivingIndex, DerivePathTypeExt.primaryFor(coin));
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final existing = await db
.getAddresses(walletId)
.filter()
.valueEqualTo(newReceivingAddress.value)
.findFirst();
if (existing == null) {
// Add that new change address
await db.putAddress(newReceivingAddress);
} else {
// we need to update the address
await db.updateAddress(existing, newReceivingAddress);
}
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// keep checking until address with no tx history is set as current
await _checkReceivingAddressForTransactions();
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}
} on SocketException catch (se, s) {
Logging.instance.log(
"SocketException caught in _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $se\n$s",
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level: LogLevel.Error);
return;
} catch (e, s) {
Logging.instance.log(
"Exception rethrown from _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $e\n$s",
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level: LogLevel.Error);
rethrow;
}
}
Future<void> _checkChangeAddressForTransactions() async {
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try {
final currentChange = await _currentChangeAddress;
final int txCount = await getTxCount(address: currentChange.value);
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Logging.instance.log(
'Number of txs for current change address $currentChange: $txCount',
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level: LogLevel.Info);
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if (txCount >= 1 || currentChange.derivationIndex < 0) {
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// First increment the change index
final newChangeIndex = currentChange.derivationIndex + 1;
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// Use new index to derive a new change address
final newChangeAddress = await _generateAddressForChain(
1, newChangeIndex, DerivePathTypeExt.primaryFor(coin));
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final existing = await db
.getAddresses(walletId)
.filter()
.valueEqualTo(newChangeAddress.value)
.findFirst();
if (existing == null) {
// Add that new change address
await db.putAddress(newChangeAddress);
} else {
// we need to update the address
await db.updateAddress(existing, newChangeAddress);
}
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// keep checking until address with no tx history is set as current
await _checkChangeAddressForTransactions();
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}
} on SocketException catch (se, s) {
Logging.instance.log(
"SocketException caught in _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $se\n$s",
level: LogLevel.Error);
return;
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} catch (e, s) {
Logging.instance.log(
"Exception rethrown from _checkReceivingAddressForTransactions(${DerivePathTypeExt.primaryFor(coin)}): $e\n$s",
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level: LogLevel.Error);
rethrow;
}
}
Future<void> _checkCurrentReceivingAddressesForTransactions() async {
try {
// for (final type in DerivePathType.values) {
await _checkReceivingAddressForTransactions();
// }
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} 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<void> checkCurrentReceivingAddressesForTransactions() async {
if (Platform.environment["FLUTTER_TEST"] == "true") {
try {
return _checkCurrentReceivingAddressesForTransactions();
} catch (_) {
rethrow;
}
}
}
Future<void> _checkCurrentChangeAddressesForTransactions() async {
try {
// for (final type in DerivePathType.values) {
await _checkChangeAddressForTransactions();
// }
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} 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<void> checkCurrentChangeAddressesForTransactions() async {
if (Platform.environment["FLUTTER_TEST"] == "true") {
try {
return _checkCurrentChangeAddressesForTransactions();
} catch (_) {
rethrow;
}
}
}
/// attempts to convert a string to a valid scripthash
///
/// Returns the scripthash or throws an exception on invalid bch address
String _convertToScriptHash(String bchAddress, NetworkType network) {
try {
if (bitbox.Address.detectFormat(bchAddress) ==
bitbox.Address.formatCashAddr &&
validateCashAddr(bchAddress)) {
bchAddress = bitbox.Address.toLegacyAddress(bchAddress);
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}
return AddressUtils.convertToScriptHash(bchAddress, network);
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} catch (e) {
rethrow;
}
}
Future<List<Map<String, dynamic>>> _fetchHistory(
List<String> allAddresses) async {
try {
List<Map<String, dynamic>> allTxHashes = [];
final Map<int, Map<String, List<dynamic>>> batches = {};
final Map<String, String> requestIdToAddressMap = {};
const batchSizeMax = 10;
int batchNumber = 0;
for (int i = 0; i < allAddresses.length; i++) {
if (batches[batchNumber] == null) {
batches[batchNumber] = {};
}
final scripthash = _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<Map<String, dynamic>> allTransactions, String txid) {
for (int i = 0; i < allTransactions.length; i++) {
if (allTransactions[i]["txid"] == txid) {
return true;
}
}
return false;
}
Future<void> _refreshTransactions() async {
List<isar_models.Address> allAddressesOld = await _fetchAllOwnAddresses();
Set<String> receivingAddresses = allAddressesOld
.where((e) => e.subType == isar_models.AddressSubType.receiving)
.map((e) {
if (bitbox.Address.detectFormat(e.value) == bitbox.Address.formatLegacy &&
(addressType(address: e.value) == DerivePathType.bip44 ||
addressType(address: e.value) == DerivePathType.bch44)) {
return bitbox.Address.toCashAddress(e.value);
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} else {
return e.value;
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}
}).toSet();
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Set<String> changeAddresses = allAddressesOld
.where((e) => e.subType == isar_models.AddressSubType.change)
.map((e) {
if (bitbox.Address.detectFormat(e.value) == bitbox.Address.formatLegacy &&
(addressType(address: e.value) == DerivePathType.bip44 ||
addressType(address: e.value) == DerivePathType.bch44)) {
return bitbox.Address.toCashAddress(e.value);
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} else {
return e.value;
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}
}).toSet();
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final List<Map<String, dynamic>> allTxHashes =
await _fetchHistory([...receivingAddresses, ...changeAddresses]);
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List<Map<String, dynamic>> allTransactions = [];
for (final txHash in allTxHashes) {
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final storedTx = await db
.getTransactions(walletId)
.filter()
.txidEqualTo(txHash["tx_hash"] as String)
.findFirst();
if (storedTx == null ||
storedTx.address.value == null ||
storedTx.height == null ||
(storedTx.height != null && storedTx.height! <= 0)
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// zero conf messes this up
// !storedTx.isConfirmed(currentHeight, MINIMUM_CONFIRMATIONS)
) {
final tx = await cachedElectrumXClient.getTransaction(
txHash: txHash["tx_hash"] as String,
verbose: true,
coin: coin,
);
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// Logging.instance.log("TRANSACTION: ${jsonEncode(tx)}");
if (!_duplicateTxCheck(allTransactions, tx["txid"] as String)) {
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tx["address"] = await db
.getAddresses(walletId)
.filter()
.valueEqualTo(txHash["address"] as String)
.findFirst();
tx["height"] = txHash["height"];
allTransactions.add(tx);
}
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}
}
//
// Logging.instance.log("addAddresses: $allAddresses", level: LogLevel.Info);
// Logging.instance.log("allTxHashes: $allTxHashes", level: LogLevel.Info);
//
// Logging.instance.log("allTransactions length: ${allTransactions.length}",
// level: LogLevel.Info);
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final List<Tuple2<isar_models.Transaction, isar_models.Address?>> txns = [];
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for (final txData in allTransactions) {
Set<String> inputAddresses = {};
Set<String> outputAddresses = {};
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Amount totalInputValue = Amount(
rawValue: BigInt.from(0),
fractionDigits: coin.decimals,
);
Amount totalOutputValue = Amount(
rawValue: BigInt.from(0),
fractionDigits: coin.decimals,
);
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Amount amountSentFromWallet = Amount(
rawValue: BigInt.from(0),
fractionDigits: coin.decimals,
);
Amount amountReceivedInWallet = Amount(
rawValue: BigInt.from(0),
fractionDigits: coin.decimals,
);
Amount changeAmount = Amount(
rawValue: BigInt.from(0),
fractionDigits: coin.decimals,
);
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// parse inputs
for (final input in txData["vin"] as List) {
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final prevTxid = input["txid"] as String;
final prevOut = input["vout"] as int;
// fetch input tx to get address
final inputTx = await cachedElectrumXClient.getTransaction(
txHash: prevTxid,
coin: coin,
);
for (final output in inputTx["vout"] as List) {
// check matching output
if (prevOut == output["n"]) {
// get value
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final value = Amount.fromDecimal(
Decimal.parse(output["value"].toString()),
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fractionDigits: coin.decimals,
);
// add value to total
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totalInputValue = totalInputValue + value;
// get input(prevOut) address
final address =
output["scriptPubKey"]?["addresses"]?[0] as String? ??
output["scriptPubKey"]?["address"] as String?;
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if (address != null) {
inputAddresses.add(address);
// if input was from my wallet, add value to amount sent
if (receivingAddresses.contains(address) ||
changeAddresses.contains(address)) {
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amountSentFromWallet = amountSentFromWallet + value;
}
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}
}
}
}
// parse outputs
for (final output in txData["vout"] as List) {
// get value
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final value = Amount.fromDecimal(
Decimal.parse(output["value"].toString()),
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fractionDigits: coin.decimals,
);
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// add value to total
totalOutputValue += value;
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// get output address
final address = output["scriptPubKey"]?["addresses"]?[0] as String? ??
output["scriptPubKey"]?["address"] as String?;
if (address != null) {
outputAddresses.add(address);
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// if output was to my wallet, add value to amount received
if (receivingAddresses.contains(address)) {
amountReceivedInWallet += value;
} else if (changeAddresses.contains(address)) {
changeAmount += value;
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}
}
}
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final mySentFromAddresses = [
...receivingAddresses.intersection(inputAddresses),
...changeAddresses.intersection(inputAddresses)
];
final myReceivedOnAddresses =
receivingAddresses.intersection(outputAddresses);
final myChangeReceivedOnAddresses =
changeAddresses.intersection(outputAddresses);
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final fee = totalInputValue - totalOutputValue;
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// this is the address initially used to fetch the txid
isar_models.Address transactionAddress =
txData["address"] as isar_models.Address;
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isar_models.TransactionType type;
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Amount amount;
if (mySentFromAddresses.isNotEmpty && myReceivedOnAddresses.isNotEmpty) {
// tx is sent to self
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type = isar_models.TransactionType.sentToSelf;
amount =
amountSentFromWallet - amountReceivedInWallet - fee - changeAmount;
} else if (mySentFromAddresses.isNotEmpty) {
// outgoing tx
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type = isar_models.TransactionType.outgoing;
amount = amountSentFromWallet - changeAmount - fee;
final possible =
outputAddresses.difference(myChangeReceivedOnAddresses).first;
if (transactionAddress.value != possible) {
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transactionAddress = isar_models.Address(
walletId: walletId,
value: possible,
publicKey: [],
type: AddressType.nonWallet,
derivationIndex: -1,
derivationPath: null,
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subType: AddressSubType.nonWallet,
);
}
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} else {
// incoming tx
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type = isar_models.TransactionType.incoming;
amount = amountReceivedInWallet;
}
List<isar_models.Input> inputs = [];
List<isar_models.Output> outputs = [];
for (final json in txData["vin"] as List) {
bool isCoinBase = json['coinbase'] != null;
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final input = isar_models.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?,
);
inputs.add(input);
}
for (final json in txData["vout"] as List) {
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final output = isar_models.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,
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value: Amount.fromDecimal(
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Decimal.parse(json["value"].toString()),
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fractionDigits: coin.decimals,
).raw.toInt(),
);
outputs.add(output);
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}
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final tx = isar_models.Transaction(
walletId: walletId,
txid: txData["txid"] as String,
timestamp: txData["blocktime"] as int? ??
(DateTime.now().millisecondsSinceEpoch ~/ 1000),
type: type,
subType: isar_models.TransactionSubType.none,
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amount: amount.raw.toInt(),
amountString: amount.toJsonString(),
fee: fee.raw.toInt(),
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height: txData["height"] as int?,
isCancelled: false,
isLelantus: false,
slateId: null,
otherData: null,
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nonce: null,
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inputs: inputs,
outputs: outputs,
numberOfMessages: null,
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);
txns.add(Tuple2(tx, transactionAddress));
}
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await db.addNewTransactionData(txns, walletId);
// quick hack to notify manager to call notifyListeners if
// transactions changed
if (txns.isNotEmpty) {
GlobalEventBus.instance.fire(
UpdatedInBackgroundEvent(
"Transactions updated/added for: $walletId $walletName ",
walletId,
),
);
}
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}
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({
required int satoshiAmountToSend,
required int selectedTxFeeRate,
required String recipientAddress,
required bool coinControl,
required bool isSendAll,
int? satsPerVByte,
int additionalOutputs = 0,
List<isar_models.UTXO>? utxos,
}) async {
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Logging.instance
.log("Starting coinSelection ----------", level: LogLevel.Info);
final List<isar_models.UTXO> availableOutputs = utxos ?? await this.utxos;
final currentChainHeight = await chainHeight;
final List<isar_models.UTXO> spendableOutputs = [];
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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, MINIMUM_CONFIRMATIONS) &&
utxo.used != true) {
spendableOutputs.add(utxo);
spendableSatoshiValue += utxo.value;
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}
}
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)
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spendableOutputs.sort((a, b) {
if (a.blockTime != null && b.blockTime != null) {
return b.blockTime!.compareTo(a.blockTime!);
} else if (a.blockTime != null) {
return -1;
} else {
return 1;
}
});
}
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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<isar_models.UTXO> utxoObjectsToUse = [];
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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;
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inputsBeingConsumed = spendableOutputs.length;
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}
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<String> recipientsArray = [recipientAddress];
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List<int> 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],
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satoshiAmounts: [satoshisBeingUsed - 1],
))["vSize"] as int;
int feeForOneOutput = satsPerVByte != null
? (satsPerVByte * vSizeForOneOutput)
: estimateTxFee(
vSize: vSizeForOneOutput,
feeRatePerKB: selectedTxFeeRate,
);
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if (feeForOneOutput < (vSizeForOneOutput + 1)) {
feeForOneOutput = (vSizeForOneOutput + 1);
}
final int amount = satoshiAmountToSend - feeForOneOutput;
dynamic txn = await buildTransaction(
utxosToUse: utxoObjectsToUse,
utxoSigningData: utxoSigningData,
recipients: recipientsArray,
satoshiAmounts: [amount],
);
Map<String, dynamic> transactionObject = {
"hex": txn["hex"],
"recipient": recipientsArray[0],
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"recipientAmt": Amount(
rawValue: BigInt.from(amount),
fractionDigits: coin.decimals,
),
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"fee": feeForOneOutput,
"vSize": txn["vSize"],
"usedUTXOs": utxoObjectsToUse,
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};
return transactionObject;
}
final int vSizeForOneOutput = (await buildTransaction(
utxosToUse: utxoObjectsToUse,
utxoSigningData: utxoSigningData,
recipients: [recipientAddress],
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satoshiAmounts: [satoshisBeingUsed - 1],
))["vSize"] as int;
final int vSizeForTwoOutPuts = (await buildTransaction(
utxosToUse: utxoObjectsToUse,
utxoSigningData: utxoSigningData,
recipients: [
recipientAddress,
await _getCurrentAddressForChain(1, DerivePathTypeExt.primaryFor(coin)),
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],
satoshiAmounts: [
satoshiAmountToSend,
satoshisBeingUsed - satoshiAmountToSend - 1,
], // dust limit is the minimum amount a change output should be
))["vSize"] as int;
// Assume 1 output, only for recipient and no change
int feeForOneOutput = satsPerVByte != null
? (satsPerVByte * vSizeForOneOutput)
: estimateTxFee(
vSize: vSizeForOneOutput,
feeRatePerKB: selectedTxFeeRate,
);
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// Assume 2 outputs, one for recipient and one for change
int feeForTwoOutputs = satsPerVByte != null
? (satsPerVByte * vSizeForTwoOutPuts)
: estimateTxFee(
vSize: vSizeForTwoOutPuts,
feeRatePerKB: selectedTxFeeRate,
);
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Logging.instance
.log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info);
Logging.instance
.log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info);
if (feeForOneOutput < (vSizeForOneOutput + 1)) {
feeForOneOutput = (vSizeForOneOutput + 1);
}
if (feeForTwoOutputs < ((vSizeForTwoOutPuts + 1))) {
feeForTwoOutputs = ((vSizeForTwoOutPuts + 1));
}
Logging.instance
.log("feeForTwoOutputs: $feeForTwoOutputs", level: LogLevel.Info);
Logging.instance
.log("feeForOneOutput: $feeForOneOutput", level: LogLevel.Info);
if (satoshisBeingUsed - satoshiAmountToSend > feeForOneOutput) {
if (satoshisBeingUsed - satoshiAmountToSend >
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feeForOneOutput + DUST_LIMIT.raw.toInt()) {
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// 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.
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if (changeOutputSize > DUST_LIMIT.raw.toInt() &&
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satoshisBeingUsed - satoshiAmountToSend - changeOutputSize ==
feeForTwoOutputs) {
// generate new change address if current change address has been used
await _checkChangeAddressForTransactions();
final String newChangeAddress = await _getCurrentAddressForChain(
1, DerivePathTypeExt.primaryFor(coin));
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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<String, dynamic> transactionObject = {
"hex": txn["hex"],
"recipient": recipientsArray[0],
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"recipientAmt": Amount(
rawValue: BigInt.from(recipientsAmtArray[0]),
fractionDigits: coin.decimals,
),
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"fee": feeBeingPaid,
"vSize": txn["vSize"],
"usedUTXOs": utxoObjectsToUse,
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};
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<String, dynamic> transactionObject = {
"hex": txn["hex"],
"recipient": recipientsArray[0],
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"recipientAmt": Amount(
rawValue: BigInt.from(recipientsAmtArray[0]),
fractionDigits: coin.decimals,
),
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"fee": satoshisBeingUsed - satoshiAmountToSend,
"vSize": txn["vSize"],
"usedUTXOs": utxoObjectsToUse,
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};
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<String, dynamic> transactionObject = {
"hex": txn["hex"],
"recipient": recipientsArray[0],
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"recipientAmt": Amount(
rawValue: BigInt.from(recipientsAmtArray[0]),
fractionDigits: coin.decimals,
),
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"fee": satoshisBeingUsed - satoshiAmountToSend,
"vSize": txn["vSize"],
"usedUTXOs": utxoObjectsToUse,
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};
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<String, dynamic> transactionObject = {
"hex": txn["hex"],
"recipient": recipientsArray[0],
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"recipientAmt": Amount(
rawValue: BigInt.from(recipientsAmtArray[0]),
fractionDigits: coin.decimals,
),
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"fee": feeForOneOutput,
"vSize": txn["vSize"],
"usedUTXOs": utxoObjectsToUse,
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};
return transactionObject;
} 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(
satoshiAmountToSend: satoshiAmountToSend,
selectedTxFeeRate: selectedTxFeeRate,
satsPerVByte: satsPerVByte,
recipientAddress: recipientAddress,
isSendAll: isSendAll,
additionalOutputs: additionalOutputs + 1,
utxos: utxos,
coinControl: coinControl,
);
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}
return 2;
}
}
Future<List<SigningData>> fetchBuildTxData(
List<isar_models.UTXO> utxosToUse,
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) async {
// return data
List<SigningData> signingData = [];
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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) {
String address =
output["scriptPubKey"]?["addresses"]?[0] as String? ??
output["scriptPubKey"]["address"] as String;
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if (bitbox.Address.detectFormat(address) !=
bitbox.Address.formatCashAddr) {
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try {
address = bitbox.Address.toCashAddress(address);
} catch (_) {
rethrow;
}
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}
utxosToUse[i] = utxosToUse[i].copyWith(address: address);
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}
}
final derivePathType = addressType(address: utxosToUse[i].address!);
signingData.add(
SigningData(
derivePathType: derivePathType,
utxo: utxosToUse[i],
),
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);
}
Map<DerivePathType, Map<String, dynamic>> receiveDerivations = {};
Map<DerivePathType, Map<String, dynamic>> changeDerivations = {};
for (final sd in signingData) {
String? pubKey;
String? wif;
// fetch receiving derivations if null
receiveDerivations[sd.derivePathType] ??= await _fetchDerivations(
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chain: 0,
derivePathType: sd.derivePathType,
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);
final receiveDerivation =
receiveDerivations[sd.derivePathType]![sd.utxo.address!];
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if (receiveDerivation != null) {
pubKey = receiveDerivation["pubKey"] as String;
wif = receiveDerivation["wif"] as String;
} else {
// fetch change derivations if null
changeDerivations[sd.derivePathType] ??= await _fetchDerivations(
chain: 1,
derivePathType: sd.derivePathType,
);
final changeDerivation =
changeDerivations[sd.derivePathType]![sd.utxo.address!];
if (changeDerivation != null) {
pubKey = changeDerivation["pubKey"] as String;
wif = changeDerivation["wif"] as String;
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}
}
if (wif == null || pubKey == null) {
final address = await db.getAddress(walletId, sd.utxo.address!);
if (address?.derivationPath != null) {
final node = await Bip32Utils.getBip32Node(
(await mnemonicString)!,
(await mnemonicPassphrase)!,
_network,
address!.derivationPath!.value,
);
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wif = node.toWIF();
pubKey = Format.uint8listToString(node.publicKey);
}
}
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if (wif != null && pubKey != null) {
final PaymentData data;
final Uint8List? redeemScript;
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switch (sd.derivePathType) {
case DerivePathType.bip44:
case DerivePathType.bch44:
data = P2PKH(
data: PaymentData(
pubkey: Format.stringToUint8List(pubKey),
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),
network: _network,
).data;
redeemScript = null;
break;
default:
throw Exception("DerivePathType unsupported");
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}
final keyPair = ECPair.fromWIF(
wif,
network: _network,
);
sd.redeemScript = redeemScript;
sd.output = data.output;
sd.keyPair = keyPair;
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}
}
return signingData;
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} catch (e, s) {
Logging.instance
.log("fetchBuildTxData() threw: $e,\n$s", level: LogLevel.Error);
rethrow;
}
}
/// Builds and signs a transaction
Future<Map<String, dynamic>> buildTransaction({
required List<isar_models.UTXO> utxosToUse,
required List<SigningData> utxoSigningData,
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required List<String> recipients,
required List<int> satoshiAmounts,
}) async {
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final builder = bitbox.Bitbox.transactionBuilder(
testnet: coin == Coin.bitcoincashTestnet,
);
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// retrieve address' utxos from the rest api
List<bitbox.Utxo> _utxos =
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[]; // await Bitbox.Address.utxo(address) as List<Bitbox.Utxo>;
for (var element in utxosToUse) {
_utxos.add(bitbox.Utxo(
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element.txid,
element.vout,
bitbox.BitcoinCash.fromSatoshi(element.value),
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element.value,
0,
MINIMUM_CONFIRMATIONS + 1));
}
Logger.print("bch utxos: $_utxos");
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// placeholder for input signatures
final List<Map<dynamic, dynamic>> signatures = [];
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// placeholder for total input balance
// int totalBalance = 0;
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// iterate through the list of address _utxos and use them as inputs for the
// withdrawal transaction
for (var utxo in _utxos) {
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// add the utxo as an input for the transaction
builder.addInput(utxo.txid, utxo.vout);
final ec =
utxoSigningData.firstWhere((e) => e.utxo.txid == utxo.txid).keyPair!;
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final bitboxEC = bitbox.ECPair.fromWIF(ec.toWIF());
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// add a signature to the list to be used later
signatures.add({
"vin": signatures.length,
"key_pair": bitboxEC,
"original_amount": utxo.satoshis
});
// totalBalance += utxo.satoshis;
}
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// calculate the fee based on number of inputs and one expected output
// final fee =
// bitbox.BitcoinCash.getByteCount(signatures.length, recipients.length);
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// calculate how much balance will be left over to spend after the fee
// final sendAmount = totalBalance - fee;
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// add the output based on the address provided in the testing data
for (int i = 0; i < recipients.length; i++) {
String recipient = recipients[i];
int satoshiAmount = satoshiAmounts[i];
builder.addOutput(recipient, satoshiAmount);
}
// sign all inputs
for (var signature in signatures) {
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builder.sign(
signature["vin"] as int,
signature["key_pair"] as bitbox.ECPair,
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signature["original_amount"] as int);
}
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// build the transaction
final tx = builder.build();
final txHex = tx.toHex();
final vSize = tx.virtualSize();
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//todo: check if print needed
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Logger.print("bch raw hex: $txHex");
return {"hex": txHex, "vSize": vSize};
}
@override
Future<void> 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);
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// clear blockchain info
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await db.deleteWalletBlockchainData(walletId);
await _deleteDerivations();
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try {
final _mnemonic = await mnemonicString;
final _mnemonicPassphrase = await mnemonicPassphrase;
if (_mnemonicPassphrase == null) {
Logging.instance.log(
"Exception in fullRescan: mnemonic passphrase null, possible migration issue; if using internal builds, delete wallet and restore from seed, if using a release build, please file bug report",
level: LogLevel.Error);
}
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await _recoverWalletFromBIP32SeedPhrase(
mnemonic: _mnemonic!,
mnemonicPassphrase: _mnemonicPassphrase!,
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maxUnusedAddressGap: maxUnusedAddressGap,
maxNumberOfIndexesToCheck: maxNumberOfIndexesToCheck,
isRescan: true,
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);
longMutex = false;
await refresh();
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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,
),
);
longMutex = false;
Logging.instance.log("Exception rethrown from fullRescan(): $e\n$s",
level: LogLevel.Error);
rethrow;
}
}
Future<void> _deleteDerivations() async {
// P2PKH derivations
await _secureStore.delete(key: "${walletId}_receiveDerivationsP2PKH");
await _secureStore.delete(key: "${walletId}_changeDerivationsP2PKH");
// P2SH derivations
await _secureStore.delete(key: "${walletId}_receiveDerivationsP2SH");
await _secureStore.delete(key: "${walletId}_changeDerivationsP2SH");
}
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@override
set isFavorite(bool markFavorite) {
_isFavorite = markFavorite;
updateCachedIsFavorite(markFavorite);
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}
@override
bool get isFavorite => _isFavorite ??= getCachedIsFavorite();
bool? _isFavorite;
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@override
bool get isRefreshing => refreshMutex;
bool isActive = false;
@override
void Function(bool)? get onIsActiveWalletChanged =>
(isActive) => this.isActive = isActive;
@override
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Future<Amount> estimateFeeFor(Amount amount, int feeRate) async {
final available = balance.spendable;
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if (available == amount) {
return amount - (await sweepAllEstimate(feeRate));
} else if (amount <= Amount.zero || amount > available) {
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return roughFeeEstimate(1, 2, feeRate);
}
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Amount runningBalance = Amount(
rawValue: BigInt.zero,
fractionDigits: coin.decimals,
);
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int inputCount = 0;
for (final output in (await utxos)) {
if (!output.isBlocked) {
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runningBalance += Amount(
rawValue: BigInt.from(output.value),
fractionDigits: coin.decimals,
);
inputCount++;
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if (runningBalance > amount) {
break;
}
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}
}
final oneOutPutFee = roughFeeEstimate(inputCount, 1, feeRate);
final twoOutPutFee = roughFeeEstimate(inputCount, 2, feeRate);
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if (runningBalance - amount > oneOutPutFee) {
if (runningBalance - amount > oneOutPutFee + DUST_LIMIT) {
final change = runningBalance - amount - twoOutPutFee;
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if (change > DUST_LIMIT &&
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runningBalance - amount - change == twoOutPutFee) {
return runningBalance - amount - change;
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} else {
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return runningBalance - amount;
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}
} else {
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return runningBalance - amount;
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}
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} else if (runningBalance - amount == oneOutPutFee) {
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return oneOutPutFee;
} else {
return twoOutPutFee;
}
}
// TODO: correct formula for bch?
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Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) {
return Amount(
rawValue: BigInt.from(((181 * inputCount) + (34 * outputCount) + 10) *
(feeRatePerKB / 1000).ceil()),
fractionDigits: coin.decimals,
);
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}
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Future<Amount> sweepAllEstimate(int feeRate) async {
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int available = 0;
int inputCount = 0;
for (final output in (await utxos)) {
if (!output.isBlocked &&
output.isConfirmed(storedChainHeight, MINIMUM_CONFIRMATIONS)) {
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available += output.value;
inputCount++;
}
}
// transaction will only have 1 output minus the fee
final estimatedFee = roughFeeEstimate(inputCount, 1, feeRate);
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return Amount(
rawValue: BigInt.from(available),
fractionDigits: coin.decimals,
) -
estimatedFee;
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}
@override
Future<bool> generateNewAddress() async {
try {
final currentReceiving = await _currentReceivingAddress;
final newReceivingIndex = currentReceiving.derivationIndex + 1;
// Use new index to derive a new receiving address
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final newReceivingAddress = await _generateAddressForChain(
0, newReceivingIndex, DerivePathTypeExt.primaryFor(coin));
// Add that new receiving address
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await db.putAddress(newReceivingAddress);
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return true;
} catch (e, s) {
Logging.instance.log(
"Exception rethrown from generateNewAddress(): $e\n$s",
level: LogLevel.Error);
return false;
}
}
@override
Future<String> get xpub async {
final node = await Bip32Utils.getBip32Root(
(await mnemonic).join(" "),
await mnemonicPassphrase ?? "",
_network,
);
return node.neutered().toBase58();
}
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}
// Bitcoincash Network
final bitcoincash = NetworkType(
messagePrefix: '\x18Bitcoin Signed Message:\n',
bech32: 'bc',
bip32: Bip32Type(public: 0x0488b21e, private: 0x0488ade4),
pubKeyHash: 0x00,
scriptHash: 0x05,
wif: 0x80);
final bitcoincashtestnet = NetworkType(
messagePrefix: '\x18Bitcoin Signed Message:\n',
bech32: 'tb',
bip32: Bip32Type(public: 0x043587cf, private: 0x04358394),
pubKeyHash: 0x6f,
scriptHash: 0xc4,
wif: 0xef);