cake_wallet/cw_zano/lib/zano_wallet.dart

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import 'dart:async';
import 'dart:io';
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import 'package:cw_core/cake_hive.dart';
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import 'package:cw_core/crypto_currency.dart';
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import 'package:cw_core/node.dart';
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import 'package:cw_core/pathForWallet.dart';
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import 'package:cw_core/pending_transaction.dart';
import 'package:cw_core/sync_status.dart';
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import 'package:cw_core/transaction_priority.dart';
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import 'package:cw_core/wallet_base.dart';
import 'package:cw_core/wallet_credentials.dart';
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import 'package:cw_core/wallet_info.dart';
import 'package:cw_zano/api/model/create_wallet_result.dart';
import 'package:cw_zano/api/model/destination.dart';
import 'package:cw_zano/api/model/get_recent_txs_and_info_result.dart';
import 'package:cw_zano/api/model/get_wallet_status_result.dart';
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import 'package:cw_zano/api/model/transfer.dart';
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import 'package:cw_zano/model/pending_zano_transaction.dart';
import 'package:cw_zano/model/zano_asset.dart';
import 'package:cw_zano/model/zano_balance.dart';
import 'package:cw_zano/model/zano_transaction_creation_exception.dart';
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import 'package:cw_zano/model/zano_transaction_credentials.dart';
import 'package:cw_zano/model/zano_transaction_info.dart';
import 'package:cw_zano/model/zano_wallet_keys.dart';
import 'package:cw_zano/zano_formatter.dart';
import 'package:cw_zano/zano_transaction_history.dart';
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import 'package:cw_zano/zano_wallet_addresses.dart';
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import 'package:cw_zano/zano_wallet_api.dart';
import 'package:cw_zano/zano_wallet_exceptions.dart';
import 'package:cw_zano/zano_wallet_service.dart';
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import 'package:flutter/material.dart';
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import 'package:mobx/mobx.dart';
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part 'zano_wallet.g.dart';
class ZanoWallet = ZanoWalletBase with _$ZanoWallet;
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abstract class ZanoWalletBase extends WalletBase<ZanoBalance, ZanoTransactionHistory, ZanoTransactionInfo> with Store, ZanoWalletApi {
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static const int _autoSaveIntervalSeconds = 30;
static const int _pollIntervalMilliseconds = 2000;
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@override
ZanoWalletAddresses walletAddresses;
@override
@observable
SyncStatus syncStatus;
@override
@observable
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ObservableMap<CryptoCurrency, ZanoBalance> balance;
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@override
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String seed = '';
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@override
ZanoWalletKeys keys = ZanoWalletKeys(privateSpendKey: '', privateViewKey: '', publicSpendKey: '', publicViewKey: '');
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static const String zanoAssetId = 'd6329b5b1f7c0805b5c345f4957554002a2f557845f64d7645dae0e051a6498a';
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Map<String, ZanoAsset> zanoAssets = {};
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Timer? _updateSyncInfoTimer;
int _lastKnownBlockHeight = 0;
int _initialSyncHeight = 0;
int currentDaemonHeight = 0;
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bool _isTransactionUpdating;
bool _hasSyncAfterStartup;
Timer? _autoSaveTimer;
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/// index of last transaction fetched
int _lastTxIndex = 0;
/// number of transactions in each request
static const int _txChunkSize = 30;
ZanoWalletBase(WalletInfo walletInfo)
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: balance = ObservableMap.of({CryptoCurrency.zano: ZanoBalance.empty()}),
_isTransactionUpdating = false,
_hasSyncAfterStartup = false,
walletAddresses = ZanoWalletAddresses(walletInfo),
syncStatus = NotConnectedSyncStatus(),
super(walletInfo) {
transactionHistory = ZanoTransactionHistory();
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if (!CakeHive.isAdapterRegistered(ZanoAsset.typeId)) {
CakeHive.registerAdapter(ZanoAssetAdapter());
}
}
@override
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int calculateEstimatedFee(TransactionPriority priority, [int? amount = null]) => getCurrentTxFee(priority);
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@override
Future<void> changePassword(String password) async {
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setPassword(password);
}
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static Future<ZanoWallet> create({required WalletCredentials credentials}) async {
final wallet = ZanoWallet(credentials.walletInfo!);
await wallet.connectToNode(node: Node());
final path = await pathForWallet(name: credentials.name, type: credentials.walletInfo!.type);
final createWalletResult = await wallet.createWallet(path, credentials.password!);
await _parseCreateWalletResult(createWalletResult, wallet);
await wallet.init(createWalletResult.wi.address);
return wallet;
}
static Future<ZanoWallet> restore({required ZanoRestoreWalletFromSeedCredentials credentials}) async {
final wallet = ZanoWallet(credentials.walletInfo!);
await wallet.connectToNode(node: Node());
final path = await pathForWallet(name: credentials.name, type: credentials.walletInfo!.type);
final createWalletResult = await wallet.restoreWalletFromSeed(path, credentials.password!, credentials.mnemonic);
await _parseCreateWalletResult(createWalletResult, wallet);
await wallet.init(createWalletResult.wi.address);
return wallet;
}
static Future<ZanoWallet> open({required String name, required String password, required WalletInfo walletInfo}) async {
final path = await pathForWallet(name: name, type: walletInfo.type);
final wallet = ZanoWallet(walletInfo);
await wallet.connectToNode(node: Node());
final createWalletResult = await wallet.loadWallet(path, password);
await _parseCreateWalletResult(createWalletResult, wallet);
await wallet.init(createWalletResult.wi.address);
return wallet;
}
static Future<void> _parseCreateWalletResult(CreateWalletResult result, ZanoWallet wallet) async {
wallet.hWallet = result.walletId;
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ZanoWalletApi.info('setting hWallet = ${result.walletId}');
wallet.walletAddresses.address = result.wi.address;
for (final item in result.wi.balances) {
if (item.assetInfo.assetId == zanoAssetId) {
wallet.balance[CryptoCurrency.zano] = ZanoBalance(
total: item.total,
unlocked: item.unlocked,
);
}
}
if (result.recentHistory.history != null) {
final transfers = result.recentHistory.history!;
final transactions = Transfer.makeMap(transfers, wallet.zanoAssets, wallet.currentDaemonHeight);
wallet.transactionHistory.addMany(transactions);
await wallet.transactionHistory.save();
}
}
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@override
void close() {
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closeWallet();
_updateSyncInfoTimer?.cancel();
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_autoSaveTimer?.cancel();
}
@override
Future<void> connectToNode({required Node node}) async {
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syncStatus = ConnectingSyncStatus();
await setupNode();
syncStatus = ConnectedSyncStatus();
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}
@override
Future<PendingTransaction> createTransaction(Object credentials) async {
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credentials as ZanoTransactionCredentials;
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final isZano = credentials.currency == CryptoCurrency.zano;
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final outputs = credentials.outputs;
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final hasMultiDestination = outputs.length > 1;
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final unlockedBalanceZano = BigInt.from(balance[CryptoCurrency.zano]?.unlocked ?? 0);
final unlockedBalanceCurrency = BigInt.from(balance[credentials.currency]?.unlocked ?? 0);
final fee = BigInt.from(calculateEstimatedFee(credentials.priority));
late BigInt totalAmount;
void checkForEnoughBalances() {
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if (isZano) {
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if (totalAmount + fee > unlockedBalanceZano) {
throw ZanoTransactionCreationException(
"You don't have enough coins (required: ${ZanoFormatter.bigIntAmountToString(totalAmount + fee)} ZANO, unlocked ${ZanoFormatter.bigIntAmountToString(unlockedBalanceZano)} ZANO).");
}
} else {
if (fee > unlockedBalanceZano) {
throw ZanoTransactionCreationException(
"You don't have enough coins (required: ${ZanoFormatter.bigIntAmountToString(fee)} ZANO, unlocked ${ZanoFormatter.bigIntAmountToString(unlockedBalanceZano)} ZANO).");
}
if (totalAmount > unlockedBalanceCurrency) {
throw ZanoTransactionCreationException(
"You don't have enough coins (required: ${ZanoFormatter.bigIntAmountToString(totalAmount)} ${credentials.currency.title}, unlocked ${ZanoFormatter.bigIntAmountToString(unlockedBalanceZano)} ${credentials.currency.title}).");
}
}
}
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final assetId = isZano ? zanoAssetId : (credentials.currency as ZanoAsset).assetId;
late List<Destination> destinations;
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if (hasMultiDestination) {
if (outputs.any((output) => output.sendAll || (output.formattedCryptoAmount ?? 0) <= 0)) {
throw ZanoTransactionCreationException("You don't have enough coins.");
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}
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totalAmount = outputs.fold(BigInt.zero, (acc, value) => acc + BigInt.from(value.formattedCryptoAmount ?? 0));
checkForEnoughBalances();
destinations = outputs
.map((output) => Destination(
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amount: BigInt.from(output.formattedCryptoAmount ?? 0),
address: output.isParsedAddress ? output.extractedAddress! : output.address,
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assetId: assetId,
))
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.toList();
} else {
final output = outputs.first;
if (output.sendAll) {
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if (isZano) {
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totalAmount = unlockedBalanceZano - fee;
} else {
totalAmount = unlockedBalanceCurrency;
}
} else {
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totalAmount = BigInt.from(output.formattedCryptoAmount!);
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}
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checkForEnoughBalances();
destinations = [
Destination(
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amount: totalAmount,
address: output.isParsedAddress ? output.extractedAddress! : output.address,
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assetId: assetId,
)
];
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}
return PendingZanoTransaction(
zanoWallet: this,
destinations: destinations,
fee: fee,
comment: outputs.first.note ?? '',
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assetId: assetId,
ticker: credentials.currency.title,
decimalPoint: credentials.currency.decimals,
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amount: totalAmount,
);
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}
@override
Future<Map<String, ZanoTransactionInfo>> fetchTransactions() async {
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try {
final transfers = <Transfer>[];
late GetRecentTxsAndInfoResult result;
do {
result = await getRecentTxsAndInfo(offset: _lastTxIndex, count: _txChunkSize);
_lastTxIndex += result.transfers.length;
transfers.addAll(result.transfers);
} while (result.lastItemIndex + 1 < result.totalTransfers);
return Transfer.makeMap(transfers, zanoAssets, currentDaemonHeight);
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} catch (e) {
print(e);
return {};
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}
}
Future<void> init(String address) async {
await walletAddresses.init();
await walletAddresses.updateAddress(address);
await updateTransactions();
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_autoSaveTimer = Timer.periodic(Duration(seconds: _autoSaveIntervalSeconds), (_) async => await save());
}
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@override
Future<void> renameWalletFiles(String newWalletName) async {
final currentWalletPath = await pathForWallet(name: name, type: type);
final currentCacheFile = File(currentWalletPath);
final currentKeysFile = File('$currentWalletPath.keys');
final currentAddressListFile = File('$currentWalletPath.address.txt');
final newWalletPath = await pathForWallet(name: newWalletName, type: type);
// Copies current wallet files into new wallet name's dir and files
if (currentCacheFile.existsSync()) {
await currentCacheFile.copy(newWalletPath);
}
if (currentKeysFile.existsSync()) {
await currentKeysFile.copy('$newWalletPath.keys');
}
if (currentAddressListFile.existsSync()) {
await currentAddressListFile.copy('$newWalletPath.address.txt');
}
// Delete old name's dir and files
await Directory(currentWalletPath).delete(recursive: true);
}
@override
Future<void> rescan({required int height}) => throw UnimplementedError();
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@override
Future<void> save() async {
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try {
await store();
await walletAddresses.updateAddressesInBox();
} catch (e) {
print('Error while saving Zano wallet file ${e.toString()}');
}
}
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@override
Future<void> startSync() async {
try {
syncStatus = AttemptingSyncStatus();
_lastKnownBlockHeight = 0;
_initialSyncHeight = 0;
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_updateSyncInfoTimer ??= Timer.periodic(Duration(milliseconds: _pollIntervalMilliseconds), (_) async {
final walletStatus = await getWalletStatus();
currentDaemonHeight = walletStatus.currentDaemonHeight;
_updateSyncProgress(walletStatus);
// we can call getWalletInfo ONLY if getWalletStatus returns NOT is in long refresh and wallet state is 2 (ready)
if (!walletStatus.isInLongRefresh && walletStatus.walletState == 2) {
final walletInfo = await getWalletInfo();
seed = walletInfo.wiExtended.seed;
keys = ZanoWalletKeys(
privateSpendKey: walletInfo.wiExtended.spendPrivateKey,
privateViewKey: walletInfo.wiExtended.viewPrivateKey,
publicSpendKey: walletInfo.wiExtended.spendPublicKey,
publicViewKey: walletInfo.wiExtended.viewPublicKey,
);
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final assets = await getAssetsWhitelist();
zanoAssets = {};
for (final asset in assets) {
final newAsset = ZanoAsset.copyWith(asset,
icon: _getIconPath(asset.title), enabled: walletInfo.wi.balances.any((element) => element.assetId == asset.assetId));
zanoAssets.putIfAbsent(asset.assetId, () => newAsset);
}
// matching balances and whitelists
// 1. show only balances available in whitelists
// 2. set whitelists available in balances as 'enabled' ('disabled' by default)
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for (final b in walletInfo.wi.balances) {
if (b.assetId == zanoAssetId) {
balance[CryptoCurrency.zano] = ZanoBalance(total: b.total, unlocked: b.unlocked);
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} else {
final asset = zanoAssets[b.assetId];
if (asset == null) {
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ZanoWalletApi.error('balance for an unknown asset ${b.assetInfo.assetId}');
continue;
}
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if (balance.keys.any((element) => element is ZanoAsset && element.assetId == b.assetInfo.assetId)) {
balance[balance.keys.firstWhere((element) => element is ZanoAsset && element.assetId == b.assetInfo.assetId)] =
ZanoBalance(total: b.total, unlocked: b.unlocked, decimalPoint: asset.decimalPoint);
} else {
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balance[asset] = ZanoBalance(total: b.total, unlocked: b.unlocked, decimalPoint: asset.decimalPoint);
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}
}
}
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// removing balances for assets missing in wallet info balances
balance.removeWhere(
(key, _) => key != CryptoCurrency.zano && !walletInfo.wi.balances.any((element) => element.assetId == (key as ZanoAsset).assetId),
);
}
});
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} catch (e) {
syncStatus = FailedSyncStatus();
print(e);
rethrow;
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}
}
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@override
Future<void>? updateBalance() => null;
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Future<void> updateTransactions() async {
try {
if (_isTransactionUpdating) {
return;
}
_isTransactionUpdating = true;
final transactions = await fetchTransactions();
transactionHistory.addMany(transactions);
await transactionHistory.save();
_isTransactionUpdating = false;
} catch (e) {
print(e);
_isTransactionUpdating = false;
}
}
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Future<CryptoCurrency> addZanoAssetById(String assetId) async {
if (zanoAssets.containsKey(assetId)) {
throw ZanoWalletException('zano asset with id $assetId already added');
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}
final assetDescriptor = await addAssetsWhitelist(assetId);
if (assetDescriptor == null) {
throw ZanoWalletException("there's no zano asset with id $assetId");
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}
final asset = ZanoAsset.copyWith(assetDescriptor, icon: _getIconPath(assetDescriptor.title), assetId: assetId, enabled: true);
zanoAssets[asset.assetId] = asset;
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balance[asset] = ZanoBalance.empty(decimalPoint: asset.decimalPoint);
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return asset;
}
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String? _getIconPath(String title) {
try {
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return CryptoCurrency.all.firstWhere((element) => element.title.toUpperCase() == title.toUpperCase()).iconPath;
} catch (_) {}
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return null;
}
Future<void> changeZanoAssetAvailability(ZanoAsset asset) async {
if (asset.enabled) {
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final assetDescriptor = await addAssetsWhitelist(asset.assetId);
if (assetDescriptor == null) {
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print('Error adding zano asset');
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}
} else {
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final result = await removeAssetsWhitelist(asset.assetId);
if (result == false) {
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print('Error removing zano asset');
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}
}
}
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Future<void> deleteZanoAsset(ZanoAsset asset) async {
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final _ = await removeAssetsWhitelist(asset.assetId);
}
Future<ZanoAsset?> getZanoAsset(String assetId) async {
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return await getAssetInfo(assetId);
}
Future<void> _askForUpdateTransactionHistory() async => await updateTransactions();
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void _onNewBlock(int height, int blocksLeft, double ptc) async {
try {
if (blocksLeft < 1000) {
await _askForUpdateTransactionHistory();
syncStatus = SyncedSyncStatus();
if (!_hasSyncAfterStartup) {
_hasSyncAfterStartup = true;
await save();
}
} else {
syncStatus = SyncingSyncStatus(blocksLeft, ptc);
}
} catch (e) {
print(e.toString());
}
}
void _updateSyncProgress(GetWalletStatusResult walletStatus) {
final syncHeight = walletStatus.currentWalletHeight;
if (_initialSyncHeight <= 0) {
_initialSyncHeight = syncHeight;
}
final bchHeight = walletStatus.currentDaemonHeight;
if (_lastKnownBlockHeight == syncHeight) {
return;
}
_lastKnownBlockHeight = syncHeight;
final track = bchHeight - _initialSyncHeight;
final diff = track - (bchHeight - syncHeight);
final ptc = diff <= 0 ? 0.0 : diff / track;
final left = bchHeight - syncHeight;
if (syncHeight < 0 || left < 0) {
return;
}
// 1. Actual new height; 2. Blocks left to finish; 3. Progress in percents;
_onNewBlock.call(syncHeight, left, ptc);
}
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}