mirror of
https://github.com/cake-tech/cake_wallet.git
synced 2024-11-17 01:37:40 +00:00
472 lines
14 KiB
Dart
472 lines
14 KiB
Dart
import 'dart:async';
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import 'dart:convert';
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import 'package:cake_wallet/bitcoin/address_to_output_script.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_mnemonic.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_transaction_priority.dart';
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import 'package:cake_wallet/entities/transaction_priority.dart';
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import 'package:mobx/mobx.dart';
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import 'package:flutter/foundation.dart';
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import 'package:rxdart/rxdart.dart';
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import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
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import 'package:cake_wallet/bitcoin/bitcoin_transaction_credentials.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_transaction_no_inputs_exception.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_transaction_wrong_balance_exception.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_unspent.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_wallet_keys.dart';
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import 'package:cake_wallet/bitcoin/electrum.dart';
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import 'package:cake_wallet/bitcoin/pending_bitcoin_transaction.dart';
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import 'package:cake_wallet/bitcoin/script_hash.dart';
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import 'package:cake_wallet/bitcoin/utils.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
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import 'package:cake_wallet/entities/sync_status.dart';
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import 'package:cake_wallet/entities/wallet_info.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_transaction_history.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
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import 'package:cake_wallet/bitcoin/file.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_balance.dart';
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import 'package:cake_wallet/entities/node.dart';
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import 'package:cake_wallet/core/wallet_base.dart';
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part 'bitcoin_wallet.g.dart';
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class BitcoinWallet = BitcoinWalletBase with _$BitcoinWallet;
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abstract class BitcoinWalletBase extends WalletBase<BitcoinBalance> with Store {
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BitcoinWalletBase._internal(
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{@required this.eclient,
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@required this.path,
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@required String password,
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@required WalletInfo walletInfo,
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@required List<BitcoinAddressRecord> initialAddresses,
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int accountIndex = 0,
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this.transactionHistory,
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this.mnemonic,
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BitcoinBalance initialBalance})
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: balance =
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initialBalance ?? BitcoinBalance(confirmed: 0, unconfirmed: 0),
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hd = bitcoin.HDWallet.fromSeed(mnemonicToSeedBytes(mnemonic),
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network: bitcoin.bitcoin)
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.derivePath("m/0'/0"),
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addresses = initialAddresses != null
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? ObservableList<BitcoinAddressRecord>.of(initialAddresses.toSet())
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: ObservableList<BitcoinAddressRecord>(),
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syncStatus = NotConnectedSyncStatus(),
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_password = password,
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_accountIndex = accountIndex,
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_feeRates = <int>[],
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super(walletInfo) {
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_unspent = [];
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_scripthashesUpdateSubject = {};
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}
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static BitcoinWallet fromJSON(
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{@required String password,
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@required String name,
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@required String dirPath,
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@required WalletInfo walletInfo,
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String jsonSource}) {
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final data = json.decode(jsonSource) as Map;
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final mnemonic = data['mnemonic'] as String;
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final accountIndex =
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(data['account_index'] == 'null' || data['account_index'] == null)
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? 0
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: int.parse(data['account_index'] as String);
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final _addresses = data['addresses'] as List ?? <Object>[];
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final addresses = <BitcoinAddressRecord>[];
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final balance = BitcoinBalance.fromJSON(data['balance'] as String) ??
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BitcoinBalance(confirmed: 0, unconfirmed: 0);
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_addresses.forEach((Object el) {
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if (el is String) {
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addresses.add(BitcoinAddressRecord.fromJSON(el));
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}
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});
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return BitcoinWalletBase.build(
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dirPath: dirPath,
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mnemonic: mnemonic,
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password: password,
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name: name,
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accountIndex: accountIndex,
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initialAddresses: addresses,
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initialBalance: balance,
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walletInfo: walletInfo);
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}
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static BitcoinWallet build(
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{@required String mnemonic,
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@required String password,
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@required String name,
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@required String dirPath,
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@required WalletInfo walletInfo,
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List<BitcoinAddressRecord> initialAddresses,
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BitcoinBalance initialBalance,
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int accountIndex = 0}) {
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final walletPath = '$dirPath/$name';
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final eclient = ElectrumClient();
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final history = BitcoinTransactionHistory(
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eclient: eclient, dirPath: dirPath, password: password);
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return BitcoinWallet._internal(
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eclient: eclient,
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path: walletPath,
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mnemonic: mnemonic,
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password: password,
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accountIndex: accountIndex,
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initialAddresses: initialAddresses,
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initialBalance: initialBalance,
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transactionHistory: history,
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walletInfo: walletInfo);
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}
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static int estimatedTransactionSize(int inputsCount, int outputsCounts) =>
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inputsCount * 146 + outputsCounts * 33 + 8;
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@override
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final BitcoinTransactionHistory transactionHistory;
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final String path;
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final bitcoin.HDWallet hd;
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final ElectrumClient eclient;
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final String mnemonic;
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List<BitcoinUnspent> _unspent;
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@override
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@observable
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String address;
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@override
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@observable
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BitcoinBalance balance;
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@override
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@observable
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SyncStatus syncStatus;
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ObservableList<BitcoinAddressRecord> addresses;
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List<String> get scriptHashes =>
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addresses.map((addr) => scriptHash(addr.address)).toList();
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String get xpub => hd.base58;
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@override
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String get seed => mnemonic;
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@override
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BitcoinWalletKeys get keys => BitcoinWalletKeys(
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wif: hd.wif, privateKey: hd.privKey, publicKey: hd.pubKey);
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final String _password;
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List<int> _feeRates;
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int _accountIndex;
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Map<String, BehaviorSubject<Object>> _scripthashesUpdateSubject;
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Future<void> init() async {
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if (addresses.isEmpty || addresses.length < 33) {
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final addressesCount = 33 - addresses.length;
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await generateNewAddresses(addressesCount, startIndex: addresses.length);
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}
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address = addresses[_accountIndex].address;
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transactionHistory.wallet = this;
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await transactionHistory.init();
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}
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@action
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void nextAddress() async {
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_accountIndex += 1;
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if (_accountIndex >= addresses.length) {
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_accountIndex = 0;
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}
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address = addresses[_accountIndex].address;
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await save();
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}
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Future<BitcoinAddressRecord> generateNewAddress() async {
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_accountIndex += 1;
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final address = BitcoinAddressRecord(_getAddress(index: _accountIndex),
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index: _accountIndex);
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addresses.add(address);
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await save();
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return address;
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}
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Future<List<BitcoinAddressRecord>> generateNewAddresses(int count,
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{int startIndex = 0}) async {
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final list = <BitcoinAddressRecord>[];
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for (var i = startIndex; i < count + startIndex; i++) {
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final address = BitcoinAddressRecord(_getAddress(index: i), index: i);
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list.add(address);
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}
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addresses.addAll(list);
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await save();
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return list;
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}
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Future<void> updateAddress(String address) async {
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for (final addr in addresses) {
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if (addr.address == address) {
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await save();
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break;
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}
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}
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}
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@action
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@override
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Future<void> startSync() async {
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try {
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syncStatus = StartingSyncStatus();
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transactionHistory.updateAsync(onFinished: () {
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print('transactionHistory update finished!');
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transactionHistory.save();
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});
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_subscribeForUpdates();
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await _updateBalance();
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await _updateUnspent();
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_feeRates = await eclient.feeRates();
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Timer.periodic(const Duration(minutes: 1),
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(timer) async => _feeRates = await eclient.feeRates());
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syncStatus = SyncedSyncStatus();
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} catch (e) {
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print(e.toString());
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syncStatus = FailedSyncStatus();
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}
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}
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@action
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@override
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Future<void> connectToNode({@required Node node}) async {
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try {
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syncStatus = ConnectingSyncStatus();
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await eclient.connectToUri(node.uri);
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eclient.onConnectionStatusChange = (bool isConnected) {
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if (!isConnected) {
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syncStatus = LostConnectionSyncStatus();
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}
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};
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syncStatus = ConnectedSyncStatus();
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} catch (e) {
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print(e.toString());
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syncStatus = FailedSyncStatus();
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}
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}
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@override
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Future<PendingBitcoinTransaction> createTransaction(
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Object credentials) async {
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const minAmount = 546;
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final transactionCredentials = credentials as BitcoinTransactionCredentials;
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final inputs = <BitcoinUnspent>[];
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final allAmountFee =
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calculateEstimatedFee(transactionCredentials.priority, null);
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final allAmount = balance.confirmed - allAmountFee;
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var fee = 0;
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final credentialsAmount = transactionCredentials.amount != null
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? stringDoubleToBitcoinAmount(transactionCredentials.amount)
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: 0;
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final amount = transactionCredentials.amount == null ||
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allAmount - credentialsAmount < minAmount
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? allAmount
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: credentialsAmount;
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final txb = bitcoin.TransactionBuilder(network: bitcoin.bitcoin);
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final changeAddress = address;
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var leftAmount = amount;
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var totalInputAmount = 0;
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if (_unspent.isEmpty) {
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await _updateUnspent();
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}
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for (final utx in _unspent) {
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leftAmount = leftAmount - utx.value;
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totalInputAmount += utx.value;
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inputs.add(utx);
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if (leftAmount <= 0) {
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break;
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}
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}
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if (inputs.isEmpty) {
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throw BitcoinTransactionNoInputsException();
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}
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final totalAmount = amount + fee;
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fee = transactionCredentials.amount != null
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? feeAmountForPriority(transactionCredentials.priority, inputs.length,
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amount == allAmount ? 1 : 2)
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: allAmountFee;
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if (totalAmount > balance.confirmed) {
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throw BitcoinTransactionWrongBalanceException();
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}
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if (amount <= 0 || totalInputAmount < amount) {
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throw BitcoinTransactionWrongBalanceException();
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}
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txb.setVersion(1);
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inputs.forEach((input) {
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if (input.isP2wpkh) {
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final p2wpkh = bitcoin
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.P2WPKH(
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data: generatePaymentData(hd: hd, index: input.address.index),
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network: bitcoin.bitcoin)
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.data;
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txb.addInput(input.hash, input.vout, null, p2wpkh.output);
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} else {
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txb.addInput(input.hash, input.vout);
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}
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});
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txb.addOutput(
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addressToOutputScript(transactionCredentials.address), amount);
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final estimatedSize = estimatedTransactionSize(inputs.length, 2);
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final feeAmount = feeRate(transactionCredentials.priority) * estimatedSize;
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final changeValue = totalInputAmount - amount - feeAmount;
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if (changeValue > minAmount) {
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txb.addOutput(changeAddress, changeValue);
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}
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for (var i = 0; i < inputs.length; i++) {
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final input = inputs[i];
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final keyPair = generateKeyPair(hd: hd, index: input.address.index);
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final witnessValue = input.isP2wpkh ? input.value : null;
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txb.sign(vin: i, keyPair: keyPair, witnessValue: witnessValue);
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}
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return PendingBitcoinTransaction(txb.build(),
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eclient: eclient, amount: amount, fee: fee)
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..addListener((transaction) async {
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transactionHistory.addOne(transaction);
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await _updateBalance();
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});
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}
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String toJSON() => json.encode({
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'mnemonic': mnemonic,
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'account_index': _accountIndex.toString(),
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'addresses': addresses.map((addr) => addr.toJSON()).toList(),
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'balance': balance?.toJSON()
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});
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int feeRate(TransactionPriority priority) {
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if (priority is BitcoinTransactionPriority) {
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return _feeRates[priority.raw];
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}
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return 0;
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}
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int feeAmountForPriority(BitcoinTransactionPriority priority, int inputsCount,
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int outputsCount) =>
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feeRate(priority) * estimatedTransactionSize(inputsCount, outputsCount);
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@override
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int calculateEstimatedFee(TransactionPriority priority, int amount) {
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if (priority is BitcoinTransactionPriority) {
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int inputsCount = 0;
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if (amount != null) {
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int totalValue = 0;
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for (final input in _unspent) {
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if (totalValue >= amount) {
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break;
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}
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totalValue += input.value;
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inputsCount += 1;
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}
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} else {
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inputsCount = _unspent.length;
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}
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// If send all, then we have no change value
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return feeAmountForPriority(
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priority, inputsCount, amount != null ? 2 : 1);
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}
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return 0;
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}
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@override
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Future<void> save() async {
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await write(path: path, password: _password, data: toJSON());
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await transactionHistory.save();
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}
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bitcoin.ECPair keyPairFor({@required int index}) =>
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generateKeyPair(hd: hd, index: index);
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@override
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Future<void> rescan({int height}) async {
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// FIXME: Unimplemented
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}
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@override
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void close() async {
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await eclient.close();
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}
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Future<void> _updateUnspent() async {
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final unspent = await Future.wait(addresses.map((address) => eclient
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.getListUnspentWithAddress(address.address)
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.then((unspent) => unspent
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.map((unspent) => BitcoinUnspent.fromJSON(address, unspent)))));
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_unspent = unspent.expand((e) => e).toList();
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}
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void _subscribeForUpdates() {
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scriptHashes.forEach((sh) async {
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await _scripthashesUpdateSubject[sh]?.close();
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_scripthashesUpdateSubject[sh] = eclient.scripthashUpdate(sh);
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_scripthashesUpdateSubject[sh].listen((event) async {
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try {
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await _updateBalance();
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await _updateUnspent();
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transactionHistory.updateAsync();
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} catch (e) {
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print(e.toString());
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}
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});
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});
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}
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Future<BitcoinBalance> _fetchBalances() async {
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final balances = await Future.wait(
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scriptHashes.map((sHash) => eclient.getBalance(sHash)));
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final balance = balances.fold(
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BitcoinBalance(confirmed: 0, unconfirmed: 0),
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(BitcoinBalance acc, val) => BitcoinBalance(
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confirmed: (val['confirmed'] as int ?? 0) + (acc.confirmed ?? 0),
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unconfirmed:
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(val['unconfirmed'] as int ?? 0) + (acc.unconfirmed ?? 0)));
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return balance;
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}
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Future<void> _updateBalance() async {
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balance = await _fetchBalances();
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await save();
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}
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String _getAddress({@required int index}) =>
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generateAddress(hd: hd, index: index);
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}
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