mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-11-18 18:21:08 +00:00
744 lines
24 KiB
Dart
744 lines
24 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'dart:io';
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import 'package:bitbox/bitbox.dart' as bitbox;
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import 'package:bitcoindart/bitcoindart.dart' as btcdart;
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import 'package:flutter/foundation.dart';
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import 'package:fusiondart/fusiondart.dart' as fusion;
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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';
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import 'package:stackwallet/models/fusion_progress_ui_state.dart';
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import 'package:stackwallet/models/isar/models/isar_models.dart';
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import 'package:stackwallet/pages_desktop_specific/cashfusion/sub_widgets/fusion_dialog.dart';
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import 'package:stackwallet/services/coins/bitcoincash/bitcoincash_wallet.dart';
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import 'package:stackwallet/services/fusion_tor_service.dart';
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import 'package:stackwallet/utilities/bip32_utils.dart';
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import 'package:stackwallet/utilities/enums/coin_enum.dart';
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import 'package:stackwallet/utilities/logger.dart';
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import 'package:stackwallet/utilities/prefs.dart';
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import 'package:stackwallet/utilities/stack_file_system.dart';
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const String kReservedFusionAddress = "reserved_fusion_address";
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class FusionInfo {
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final String host;
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final int port;
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final bool ssl;
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/// set to 0 for continuous
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final int rounds;
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const FusionInfo({
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required this.host,
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required this.port,
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required this.ssl,
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required this.rounds,
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}) : assert(rounds >= 0);
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static const DEFAULTS = FusionInfo(
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host: "fusion.servo.cash",
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port: 8789,
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ssl: true,
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// host: "cashfusion.stackwallet.com",
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// port: 8787,
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// ssl: false,
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rounds: 0, // 0 is continuous
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);
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factory FusionInfo.fromJsonString(String jsonString) {
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final json = jsonDecode(jsonString);
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return FusionInfo(
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host: json['host'] as String,
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port: json['port'] as int,
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ssl: json['ssl'] as bool,
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rounds: json['rounds'] as int,
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);
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}
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String toJsonString() {
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return jsonEncode({
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'host': host,
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'port': port,
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'ssl': ssl,
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'rounds': rounds,
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});
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}
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@override
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String toString() {
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return toJsonString();
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}
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@override
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bool operator ==(Object other) {
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if (identical(this, other)) {
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return true;
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}
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return other is FusionInfo &&
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other.host == host &&
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other.port == port &&
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other.ssl == ssl &&
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other.rounds == rounds;
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}
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@override
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int get hashCode {
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return Object.hash(
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host.hashCode,
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port.hashCode,
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ssl.hashCode,
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rounds.hashCode,
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);
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}
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}
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/// A mixin for the BitcoinCashWallet class that adds CashFusion functionality.
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mixin FusionWalletInterface {
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// Passed in wallet data.
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late final String _walletId;
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late final Coin _coin;
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late final MainDB _db;
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late final FusionTorService _torService;
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late final Future<String?> _mnemonic;
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late final Future<String?> _mnemonicPassphrase;
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late final btcdart.NetworkType _network;
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final _prefs = Prefs.instance;
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// setting values on this should notify any listeners (the GUI)
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FusionProgressUIState? _uiState;
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FusionProgressUIState get uiState {
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if (_uiState == null) {
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throw Exception("FusionProgressUIState has not been set for $_walletId");
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}
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return _uiState!;
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}
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set uiState(FusionProgressUIState state) {
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if (_uiState != null) {
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throw Exception("FusionProgressUIState was already set for $_walletId");
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}
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_uiState = state;
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}
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// Passed in wallet functions.
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late final Future<List<Address>> Function({int numberOfAddresses})
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_getNextUnusedChangeAddresses;
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late final CachedElectrumX Function() _getWalletCachedElectrumX;
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late final Future<int> Function() _getChainHeight;
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late final Future<void> Function() _updateWalletUTXOS;
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late final String Function(String bchAddress, btcdart.NetworkType network)
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_convertToScriptHash;
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// Fusion object.
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fusion.Fusion? _mainFusionObject;
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bool _stopRequested = false;
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/// An int storing the number of successfully completed fusion rounds.
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int _completedFuseCount = 0;
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/// An int storing the number of failed fusion rounds.
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int _failedFuseCount = 0;
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/// The maximum number of consecutive failed fusion rounds before stopping.
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int get maxFailedFuseCount => 5;
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/// Initializes the FusionWalletInterface mixin.
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///
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/// This function must be called before any other functions in this mixin.
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Future<void> initFusionInterface({
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required String walletId,
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required Coin coin,
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required MainDB db,
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required Future<List<Address>> Function({int numberOfAddresses})
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getNextUnusedChangeAddress,
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required CachedElectrumX Function() getWalletCachedElectrumX,
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required Future<int> Function() getChainHeight,
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required Future<void> Function() updateWalletUTXOS,
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required Future<String?> mnemonic,
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required Future<String?> mnemonicPassphrase,
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required btcdart.NetworkType network,
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required final String Function(
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String bchAddress, btcdart.NetworkType network)
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convertToScriptHash,
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}) async {
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// Set passed in wallet data.
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_walletId = walletId;
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_coin = coin;
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_db = db;
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_getNextUnusedChangeAddresses = getNextUnusedChangeAddress;
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_torService = FusionTorService.sharedInstance;
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_getWalletCachedElectrumX = getWalletCachedElectrumX;
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_getChainHeight = getChainHeight;
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_updateWalletUTXOS = updateWalletUTXOS;
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_mnemonic = mnemonic;
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_mnemonicPassphrase = mnemonicPassphrase;
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_network = network;
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_convertToScriptHash = convertToScriptHash;
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}
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// callback to update the ui state object
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void _updateStatus({required fusion.FusionStatus status, String? info}) {
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switch (status) {
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case fusion.FusionStatus.connecting:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.running, info: null),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: true);
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break;
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case fusion.FusionStatus.setup:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.running, info: null),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: true);
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break;
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case fusion.FusionStatus.waiting:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.running, info: null),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: true);
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break;
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case fusion.FusionStatus.running:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.running, info: null),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.waiting, info: null),
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shouldNotify: true);
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break;
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case fusion.FusionStatus.complete:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.success, info: null),
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shouldNotify: true);
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break;
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case fusion.FusionStatus.failed:
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failCurrentUiState(info);
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break;
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case fusion.FusionStatus.exception:
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failCurrentUiState(info);
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break;
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case fusion.FusionStatus.reset:
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setFusionState(
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CashFusionState(status: CashFusionStatus.waiting, info: info),
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shouldNotify: false);
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_uiState?.setFailed(false, shouldNotify: true);
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break;
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}
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}
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void failCurrentUiState(String? info) {
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// Check each _uiState value to see if it is running. If so, set it to failed.
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if (_uiState?.connecting.status == CashFusionStatus.running) {
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_uiState?.setConnecting(
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CashFusionState(status: CashFusionStatus.failed, info: info),
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shouldNotify: true);
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return;
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}
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if (_uiState?.outputs.status == CashFusionStatus.running) {
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_uiState?.setOutputs(
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CashFusionState(status: CashFusionStatus.failed, info: info),
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shouldNotify: true);
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return;
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}
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if (_uiState?.peers.status == CashFusionStatus.running) {
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_uiState?.setPeers(
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CashFusionState(status: CashFusionStatus.failed, info: info),
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shouldNotify: true);
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return;
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}
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if (_uiState?.fusing.status == CashFusionStatus.running) {
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_uiState?.setFusing(
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CashFusionState(status: CashFusionStatus.failed, info: info),
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shouldNotify: true);
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return;
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}
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if (_uiState?.complete.status == CashFusionStatus.running) {
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_uiState?.setComplete(
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CashFusionState(status: CashFusionStatus.failed, info: info),
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shouldNotify: true);
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return;
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}
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}
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/// Returns a list of all transactions in the wallet for the given address.
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Future<List<Map<String, dynamic>>> _getTransactionsByAddress(
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String address,
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) async {
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final txidList =
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await _db.getTransactions(_walletId).txidProperty().findAll();
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final futures = txidList.map(
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(e) => _getWalletCachedElectrumX().getTransaction(
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txHash: e,
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coin: _coin,
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),
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);
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return await Future.wait(futures);
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}
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Future<Uint8List> _getPrivateKeyForPubKey(List<int> pubKey) async {
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// can't directly query for equal lists in isar so we need to fetch
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// all addresses then search in dart
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try {
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final derivationPath = (await _db
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.getAddresses(_walletId)
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.filter()
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.typeEqualTo(AddressType.p2pkh)
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.and()
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.derivationPathIsNotNull()
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.and()
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.group((q) => q
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.subTypeEqualTo(AddressSubType.receiving)
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.or()
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.subTypeEqualTo(AddressSubType.change))
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.findAll())
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.firstWhere((e) => e.publicKey.toString() == pubKey.toString())
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.derivationPath!
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.value;
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final node = await Bip32Utils.getBip32Node(
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(await _mnemonic)!,
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(await _mnemonicPassphrase)!,
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_network,
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derivationPath,
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);
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return node.privateKey!;
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} catch (e, s) {
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Logging.instance.log("$e\n$s", level: LogLevel.Fatal);
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throw Exception("Derivation path for pubkey=$pubKey could not be found");
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}
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}
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/// Reserve an address for fusion.
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Future<List<Address>> _reserveAddresses(Iterable<Address> addresses) async {
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if (addresses.isEmpty) {
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return [];
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}
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final updatedAddresses = addresses
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.map((e) => e.copyWith(otherData: kReservedFusionAddress))
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.toList();
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await _db.isar.writeTxn(() async {
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for (final newAddress in updatedAddresses) {
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final oldAddress = await _db.getAddress(
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newAddress.walletId,
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newAddress.value,
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);
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if (oldAddress != null) {
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newAddress.id = oldAddress.id;
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await _db.isar.addresses.delete(oldAddress.id);
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}
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await _db.isar.addresses.put(newAddress);
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}
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});
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return updatedAddresses;
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}
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/// un reserve a fusion reserved address.
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/// If [address] is not reserved nothing happens
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Future<Address> _unReserveAddress(Address address) async {
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if (address.otherData != kReservedFusionAddress) {
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return address;
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}
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final updated = address.copyWith(otherData: null);
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// Make sure the address is updated in the database.
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await _db.updateAddress(address, updated);
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return updated;
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}
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/// Returns a list of unused reserved change addresses.
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///
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/// If there are not enough unused reserved change addresses, new ones are created.
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Future<List<fusion.Address>> _getUnusedReservedChangeAddresses(
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int numberOfAddresses,
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) async {
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final unusedChangeAddresses = await _getNextUnusedChangeAddresses(
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numberOfAddresses: numberOfAddresses,
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);
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// Initialize a list of unused reserved change addresses.
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final List<Address> unusedReservedAddresses = unusedChangeAddresses
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.where((e) => e.otherData == kReservedFusionAddress)
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.toList();
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unusedReservedAddresses.addAll(await _reserveAddresses(
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unusedChangeAddresses.where((e) => e.otherData == null)));
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// Return the list of unused reserved change addresses.
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return unusedReservedAddresses
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.map(
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(e) => fusion.Address(
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address: e.value,
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publicKey: e.publicKey,
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fusionReserved: true,
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derivationPath: fusion.DerivationPath(
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e.derivationPath!.value,
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),
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),
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)
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.toList();
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}
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int _torStartCount = 0;
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/// Returns the current Tor proxy address.
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Future<({InternetAddress host, int port})> _getSocksProxyAddress() async {
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if (_torStartCount > 5) {
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// something is quite broken so stop trying to recursively fetch
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// start up tor and fetch proxy info
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throw Exception(
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"Fusion interface attempted to start tor $_torStartCount times and failed!",
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);
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}
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try {
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final info = _torService.getProxyInfo();
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// reset counter before return info;
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_torStartCount = 0;
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return info;
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} catch (_) {
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// tor is probably not running so lets fix that
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final torDir = await StackFileSystem.applicationTorDirectory();
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_torService.init(torDataDirPath: torDir.path);
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// increment start attempt count
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_torStartCount++;
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await _torService.start();
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// try again to fetch proxy info
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return await _getSocksProxyAddress();
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}
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}
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Future<bool> _checkUtxoExists(
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String address,
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String prevTxid,
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int prevIndex,
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) async {
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final scriptHash = _convertToScriptHash(address, _network);
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final utxos = await _getWalletCachedElectrumX()
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.electrumXClient
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.getUTXOs(scripthash: scriptHash);
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for (final utxo in utxos) {
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if (utxo["tx_hash"] == prevTxid && utxo["tx_pos"] == prevIndex) {
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return true;
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}
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}
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return false;
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}
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// Initial attempt for CashFusion integration goes here.
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/// Fuse the wallet's UTXOs.
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///
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/// This function is called when the user taps the "Fuse" button in the UI.
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Future<void> fuse({
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required FusionInfo fusionInfo,
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|
}) async {
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// Initial attempt for CashFusion integration goes here.
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|
|
|
try {
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|
_updateStatus(status: fusion.FusionStatus.reset);
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|
_updateStatus(
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|
status: fusion.FusionStatus.connecting,
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|
info: "Connecting to the CashFusion server.",
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|
);
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|
|
|
// Use server host and port which ultimately come from text fields.
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|
fusion.FusionParams serverParams = fusion.FusionParams(
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serverHost: fusionInfo.host,
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serverPort: fusionInfo.port,
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serverSsl: fusionInfo.ssl,
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|
genesisHashHex:
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_coin.isTestNet ? GENESIS_HASH_TESTNET : GENESIS_HASH_MAINNET,
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|
enableDebugPrint: kDebugMode,
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|
torForOvert: _prefs.useTor,
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|
mode: fusion.FusionMode.normal,
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|
);
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|
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// Instantiate a Fusion object with custom parameters.
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_mainFusionObject = fusion.Fusion(serverParams);
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|
|
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// Pass wallet functions to the Fusion object
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await _mainFusionObject!.initFusion(
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getTransactionsByAddress: _getTransactionsByAddress,
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|
getUnusedReservedChangeAddresses: _getUnusedReservedChangeAddresses,
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|
getSocksProxyAddress: _getSocksProxyAddress,
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|
getChainHeight: _getChainHeight,
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|
updateStatusCallback: _updateStatus,
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|
checkUtxoExists: _checkUtxoExists,
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|
getTransactionJson: (String txid) async =>
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|
await _getWalletCachedElectrumX().getTransaction(
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|
coin: _coin,
|
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txHash: txid,
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|
),
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|
getPrivateKeyForPubKey: _getPrivateKeyForPubKey,
|
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broadcastTransaction: (String txHex) => _getWalletCachedElectrumX()
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.electrumXClient
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.broadcastTransaction(rawTx: txHex),
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unReserveAddresses: (List<fusion.Address> addresses) async {
|
|
final List<Future<void>> futures = [];
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|
for (final addr in addresses) {
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|
futures.add(
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|
_db.getAddress(_walletId, addr.address).then(
|
|
(address) async {
|
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if (address == null) {
|
|
// matching address not found in db so cannot mark as unreserved
|
|
// just ignore I guess. Should never actually happen in practice.
|
|
// Might be useful check in debugging cases?
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|
return;
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} else {
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await _unReserveAddress(address);
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|
}
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|
},
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|
),
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|
);
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|
}
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|
await Future.wait(futures);
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},
|
|
);
|
|
|
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// Reset internal and UI counts and flag.
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_completedFuseCount = 0;
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_uiState?.fusionRoundsCompleted = 0;
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_failedFuseCount = 0;
|
|
_uiState?.fusionRoundsFailed = 0;
|
|
_stopRequested = false;
|
|
|
|
bool shouldFuzeAgain() {
|
|
if (fusionInfo.rounds <= 0) {
|
|
// ignore count if continuous
|
|
return !_stopRequested;
|
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} else {
|
|
// not continuous
|
|
// check to make sure we aren't doing more fusions than requested
|
|
return !_stopRequested && _completedFuseCount < fusionInfo.rounds;
|
|
}
|
|
}
|
|
|
|
while (shouldFuzeAgain()) {
|
|
if (_completedFuseCount > 0 || _failedFuseCount > 0) {
|
|
_updateStatus(status: fusion.FusionStatus.reset);
|
|
_updateStatus(
|
|
status: fusion.FusionStatus.connecting,
|
|
info: "Connecting to the CashFusion server.",
|
|
);
|
|
}
|
|
|
|
// refresh wallet utxos
|
|
await _updateWalletUTXOS();
|
|
|
|
// Add unfrozen stack UTXOs.
|
|
final List<UTXO> walletUtxos = await _db
|
|
.getUTXOs(_walletId)
|
|
.filter()
|
|
.isBlockedEqualTo(false)
|
|
.and()
|
|
.addressIsNotNull()
|
|
.findAll();
|
|
|
|
final List<fusion.UtxoDTO> coinList = [];
|
|
// Loop through UTXOs, checking and adding valid ones.
|
|
for (final utxo in walletUtxos) {
|
|
final String addressString = utxo.address!;
|
|
final List<String> possibleAddresses = [addressString];
|
|
|
|
if (bitbox.Address.detectFormat(addressString) ==
|
|
bitbox.Address.formatCashAddr) {
|
|
possibleAddresses
|
|
.add(bitbox.Address.toLegacyAddress(addressString));
|
|
} else {
|
|
possibleAddresses.add(bitbox.Address.toCashAddress(addressString));
|
|
}
|
|
|
|
// Fetch address to get pubkey
|
|
final addr = await _db
|
|
.getAddresses(_walletId)
|
|
.filter()
|
|
.anyOf<String,
|
|
QueryBuilder<Address, Address, QAfterFilterCondition>>(
|
|
possibleAddresses, (q, e) => q.valueEqualTo(e))
|
|
.and()
|
|
.group((q) => q
|
|
.subTypeEqualTo(AddressSubType.change)
|
|
.or()
|
|
.subTypeEqualTo(AddressSubType.receiving))
|
|
.and()
|
|
.typeEqualTo(AddressType.p2pkh)
|
|
.findFirst();
|
|
|
|
// depending on the address type in the query above this can be null
|
|
if (addr == null) {
|
|
// A utxo object should always have a non null address.
|
|
// If non found then just ignore the UTXO (aka don't fuse it)
|
|
Logging.instance.log(
|
|
"Ignoring utxo=$utxo for address=\"$addressString\" while selecting UTXOs for Fusion",
|
|
level: LogLevel.Info,
|
|
);
|
|
continue;
|
|
}
|
|
|
|
final dto = fusion.UtxoDTO(
|
|
txid: utxo.txid,
|
|
vout: utxo.vout,
|
|
value: utxo.value,
|
|
address: utxo.address!,
|
|
pubKey: addr.publicKey,
|
|
);
|
|
|
|
// Add UTXO to coinList.
|
|
coinList.add(dto);
|
|
}
|
|
|
|
// Fuse UTXOs.
|
|
try {
|
|
await _mainFusionObject!.fuse(
|
|
inputsFromWallet: coinList,
|
|
network: _coin.isTestNet
|
|
? fusion.Utilities.testNet
|
|
: fusion.Utilities.mainNet,
|
|
);
|
|
|
|
// Increment the number of successfully completed fusion rounds.
|
|
_completedFuseCount++;
|
|
|
|
// Do the same for the UI state. This also resets the failed count (for
|
|
// the UI state only).
|
|
_uiState?.incrementFusionRoundsCompleted();
|
|
|
|
// Also reset the failed count here.
|
|
_failedFuseCount = 0;
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"$e\n$s",
|
|
level: LogLevel.Error,
|
|
);
|
|
// just continue on attempt failure
|
|
|
|
// Increment the number of failed fusion rounds.
|
|
_failedFuseCount++;
|
|
|
|
// Do the same for the UI state.
|
|
_uiState?.incrementFusionRoundsFailed();
|
|
|
|
// If we fail too many times in a row, stop trying.
|
|
if (_failedFuseCount >= maxFailedFuseCount) {
|
|
_updateStatus(
|
|
status: fusion.FusionStatus.failed,
|
|
info: "Failed $maxFailedFuseCount times in a row, stopping.");
|
|
_stopRequested = true;
|
|
_uiState?.setFailed(true, shouldNotify: true);
|
|
}
|
|
}
|
|
}
|
|
} catch (e, s) {
|
|
Logging.instance.log(
|
|
"$e\n$s",
|
|
level: LogLevel.Error,
|
|
);
|
|
|
|
// Stop the fusion process and update the UI state.
|
|
await _mainFusionObject?.stop();
|
|
_mainFusionObject = null;
|
|
_uiState?.setRunning(false, shouldNotify: true);
|
|
}
|
|
}
|
|
|
|
/// Stop the fusion process.
|
|
///
|
|
/// This function is called when the user taps the "Cancel" button in the UI
|
|
/// or closes the fusion progress dialog.
|
|
Future<void> stop() async {
|
|
_stopRequested = true;
|
|
await _mainFusionObject?.stop();
|
|
}
|
|
}
|