Cw 528 backup wallet files (#1281)

* monero wallet backup changes

* [skipci] updates

* monero fixes

* start work for bitcoin/eth

* cleanup

* [skipci] more cleanup

* add all other coins

* merge fixes

* add corrupted test

* build for testing

* actually be able to test monero

* review fixes

* more review fixes

cw_bitcoin/lib/bitcoin_wallet_service.dart

@@ -12,10 +12,8 @@ import 'package:cw_core/wallet_type.dart';
 import 'package:hive/hive.dart';
 import 'package:collection/collection.dart';
 
-class BitcoinWalletService extends WalletService<
-    BitcoinNewWalletCredentials,
-    BitcoinRestoreWalletFromSeedCredentials,
-    BitcoinRestoreWalletFromWIFCredentials> {
+class BitcoinWalletService extends WalletService<BitcoinNewWalletCredentials,
+    BitcoinRestoreWalletFromSeedCredentials, BitcoinRestoreWalletFromWIFCredentials> {
   BitcoinWalletService(this.walletInfoSource, this.unspentCoinsInfoSource);
 
   final Box<WalletInfo> walletInfoSource;
@@ -42,28 +40,41 @@ class BitcoinWalletService extends WalletService<
 
   @override
   Future<BitcoinWallet> openWallet(String name, String password) async {
-    final walletInfo = walletInfoSource.values.firstWhereOrNull(
-        (info) => info.id == WalletBase.idFor(name, getType()))!;
-    final wallet = await BitcoinWalletBase.open(
-        password: password, name: name, walletInfo: walletInfo,
-        unspentCoinsInfo: unspentCoinsInfoSource);
-    await wallet.init();
-    return wallet;
+    final walletInfo = walletInfoSource.values
+        .firstWhereOrNull((info) => info.id == WalletBase.idFor(name, getType()))!;
+    try {
+      final wallet = await BitcoinWalletBase.open(
+          password: password,
+          name: name,
+          walletInfo: walletInfo,
+          unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      saveBackup(name);
+      return wallet;
+    } catch (_) {
+      await restoreWalletFilesFromBackup(name);
+      final wallet = await BitcoinWalletBase.open(
+          password: password,
+          name: name,
+          walletInfo: walletInfo,
+          unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      return wallet;
+    }
   }
 
   @override
   Future<void> remove(String wallet) async {
-    File(await pathForWalletDir(name: wallet, type: getType()))
-        .delete(recursive: true);
-    final walletInfo = walletInfoSource.values.firstWhereOrNull(
-        (info) => info.id == WalletBase.idFor(wallet, getType()))!;
+    File(await pathForWalletDir(name: wallet, type: getType())).delete(recursive: true);
+    final walletInfo = walletInfoSource.values
+        .firstWhereOrNull((info) => info.id == WalletBase.idFor(wallet, getType()))!;
     await walletInfoSource.delete(walletInfo.key);
   }
 
   @override
   Future<void> rename(String currentName, String password, String newName) async {
-    final currentWalletInfo = walletInfoSource.values.firstWhereOrNull(
-        (info) => info.id == WalletBase.idFor(currentName, getType()))!;
+    final currentWalletInfo = walletInfoSource.values
+        .firstWhereOrNull((info) => info.id == WalletBase.idFor(currentName, getType()))!;
     final currentWallet = await BitcoinWalletBase.open(
         password: password,
         name: currentName,
@@ -71,6 +82,7 @@ class BitcoinWalletService extends WalletService<
         unspentCoinsInfo: unspentCoinsInfoSource);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());
@@ -80,13 +92,11 @@ class BitcoinWalletService extends WalletService<
   }
 
   @override
-  Future<BitcoinWallet> restoreFromKeys(
-          BitcoinRestoreWalletFromWIFCredentials credentials) async =>
+  Future<BitcoinWallet> restoreFromKeys(BitcoinRestoreWalletFromWIFCredentials credentials) async =>
       throw UnimplementedError();
 
   @override
-  Future<BitcoinWallet> restoreFromSeed(
-      BitcoinRestoreWalletFromSeedCredentials credentials) async {
+  Future<BitcoinWallet> restoreFromSeed(BitcoinRestoreWalletFromSeedCredentials credentials) async {
     if (!validateMnemonic(credentials.mnemonic)) {
       throw BitcoinMnemonicIsIncorrectException();
     }

cw_bitcoin/lib/electrum_wallet.dart

@@ -601,8 +601,6 @@ abstract class ElectrumWalletBase
           electrumClient.getHistory(scriptHash).then((history) => {scriptHash: history}));
       final historyResults = await Future.wait(histories);
 
-
-
       historyResults.forEach((history) {
         history.entries.forEach((historyItem) {
           if (historyItem.value.isNotEmpty) {
@@ -622,7 +620,6 @@ abstract class ElectrumWalletBase
         }
       }
 
-
       addressHashes.forEach((sh, addressRecord) {
         addressRecord.txCount = newTxCounts[sh] ?? 0;
       });

cw_bitcoin/lib/litecoin_wallet_service.dart

@@ -45,11 +45,22 @@ class LitecoinWalletService extends WalletService<
   Future<LitecoinWallet> openWallet(String name, String password) async {
     final walletInfo = walletInfoSource.values.firstWhereOrNull(
         (info) => info.id == WalletBase.idFor(name, getType()))!;
-    final wallet = await LitecoinWalletBase.open(
-        password: password, name: name, walletInfo: walletInfo,
-        unspentCoinsInfo: unspentCoinsInfoSource);
-    await wallet.init();
-    return wallet;
+
+    try {
+      final wallet = await LitecoinWalletBase.open(
+          password: password, name: name, walletInfo: walletInfo,
+          unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      saveBackup(name);
+      return wallet;
+    } catch (_) {
+      await restoreWalletFilesFromBackup(name);
+      final wallet = await LitecoinWalletBase.open(
+          password: password, name: name, walletInfo: walletInfo,
+          unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      return wallet;
+    }
   }
 
   @override
@@ -72,6 +83,7 @@ class LitecoinWalletService extends WalletService<
         unspentCoinsInfo: unspentCoinsInfoSource);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet_service.dart

@@ -51,11 +51,22 @@ class BitcoinCashWalletService extends WalletService<BitcoinCashNewWalletCredent
   Future<BitcoinCashWallet> openWallet(String name, String password) async {
     final walletInfo = walletInfoSource.values.firstWhereOrNull(
             (info) => info.id == WalletBase.idFor(name, getType()))!;
-    final wallet = await BitcoinCashWalletBase.open(
-        password: password, name: name, walletInfo: walletInfo,
-        unspentCoinsInfo: unspentCoinsInfoSource);
-    await wallet.init();
-    return wallet;
+
+    try {
+      final wallet = await BitcoinCashWalletBase.open(
+          password: password, name: name, walletInfo: walletInfo,
+          unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      saveBackup(name);
+      return wallet;
+    } catch(_) {
+      await restoreWalletFilesFromBackup(name);
+      final wallet = await BitcoinCashWalletBase.open(
+      password: password, name: name, walletInfo: walletInfo,
+      unspentCoinsInfo: unspentCoinsInfoSource);
+      await wallet.init();
+      return wallet;
+    }
   }
 
   @override
@@ -78,6 +89,7 @@ class BitcoinCashWalletService extends WalletService<BitcoinCashNewWalletCredent
         unspentCoinsInfo: unspentCoinsInfoSource);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());

cw_core/lib/monero_wallet_utils.dart

@@ -54,6 +54,17 @@ Future<void> restoreWalletFiles(String name) async {
   }
 }
 
+Future<void> resetCache(String name) async {
+  await removeCache(name);
+
+  final walletDirPath = await pathForWalletDir(name: name, type: WalletType.monero);
+  final cacheFilePath = '$walletDirPath/$name';
+  final backupCacheFile = File(backupFileName(cacheFilePath));
+  if (backupCacheFile.existsSync()) {
+    await backupCacheFile.copy(cacheFilePath);
+  }
+}
+
 Future<bool> backupWalletFilesExists(String name) async {
   final walletDirPath = await pathForWalletDir(name: name, type: WalletType.monero);
   final cacheFilePath = '$walletDirPath/$name';
@@ -63,9 +74,9 @@ Future<bool> backupWalletFilesExists(String name) async {
   final backupKeysFile = File(backupFileName(keysFilePath));
   final backupAddressListFile = File(backupFileName(addressListFilePath));
 
-  return backupCacheFile.existsSync()
-    && backupKeysFile.existsSync()
-    && backupAddressListFile.existsSync();
+  return backupCacheFile.existsSync() &&
+      backupKeysFile.existsSync() &&
+      backupAddressListFile.existsSync();
 }
 
 Future<void> removeCache(String name) async {

cw_core/lib/wallet_service.dart

@@ -1,7 +1,8 @@
-import 'package:cw_core/node.dart';
+import 'dart:io';
+
+import 'package:cw_core/pathForWallet.dart';
 import 'package:cw_core/wallet_base.dart';
 import 'package:cw_core/wallet_credentials.dart';
-import 'package:cw_core/wallet_info.dart';
 import 'package:cw_core/wallet_type.dart';
 
 abstract class WalletService<N extends WalletCredentials, RFS extends WalletCredentials,
@@ -21,4 +22,22 @@ abstract class WalletService<N extends WalletCredentials, RFS extends WalletCred
   Future<void> remove(String wallet);
 
   Future<void> rename(String currentName, String password, String newName);
+
+  Future<void> restoreWalletFilesFromBackup(String name) async {
+    final backupWalletDirPath = await pathForWalletDir(name: "$name.backup", type: getType());
+    final walletDirPath = await pathForWalletDir(name: name, type: getType());
+
+    if (File(backupWalletDirPath).existsSync()) {
+      await File(backupWalletDirPath).copy(walletDirPath);
+    }
+  }
+
+  Future<void> saveBackup(String name) async {
+    final backupWalletDirPath = await pathForWalletDir(name: "$name.backup", type: getType());
+    final walletDirPath = await pathForWalletDir(name: name, type: getType());
+
+    if (File(walletDirPath).existsSync()) {
+      await File(walletDirPath).copy(backupWalletDirPath);
+    }
+  }
 }

cw_ethereum/lib/ethereum_wallet_service.dart

@@ -39,16 +39,31 @@ class EthereumWalletService extends EVMChainWalletService<EthereumWallet> {
   Future<EthereumWallet> openWallet(String name, String password) async {
     final walletInfo =
         walletInfoSource.values.firstWhere((info) => info.id == WalletBase.idFor(name, getType()));
-    final wallet = await EthereumWallet.open(
-      name: name,
-      password: password,
-      walletInfo: walletInfo,
-    );
 
-    await wallet.init();
-    await wallet.save();
+    try {
+      final wallet = await EthereumWallet.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
 
-    return wallet;
+      await wallet.init();
+      await wallet.save();
+      saveBackup(name);
+      return wallet;
+    } catch (_) {
+      
+      await restoreWalletFilesFromBackup(name);
+
+      final wallet = await EthereumWallet.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
+      await wallet.init();
+      await wallet.save();
+      return wallet;
+    }
   }
 
   @override
@@ -59,6 +74,7 @@ class EthereumWalletService extends EVMChainWalletService<EthereumWallet> {
         password: password, name: currentName, walletInfo: currentWalletInfo);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());

cw_haven/lib/haven_wallet_service.dart

@@ -163,6 +163,7 @@ class HavenWalletService extends WalletService<
     final currentWallet = HavenWallet(walletInfo: currentWalletInfo);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());

cw_monero/lib/monero_wallet.dart

@@ -36,6 +36,8 @@ import 'package:mobx/mobx.dart';
 part 'monero_wallet.g.dart';
 
 const moneroBlockSize = 1000;
+// not sure if this should just be 0 but setting it higher feels safer / should catch more cases:
+const MIN_RESTORE_HEIGHT = 1000;
 
 class MoneroWallet = MoneroWalletBase with _$MoneroWallet;
 
@@ -79,7 +81,7 @@ abstract class MoneroWalletBase
 
   Box<UnspentCoinsInfo> unspentCoinsInfo;
 
-  void Function(FlutterErrorDetails)? _onError;
+  void Function(FlutterErrorDetails)? onError;
 
   @override
   late MoneroWalletAddresses walletAddresses;
@@ -171,7 +173,26 @@ abstract class MoneroWalletBase
   Future<void> startSync() async {
     try {
       _setInitialHeight();
-    } catch (_) {}
+    } catch (_) {
+      // our restore height wasn't correct, so lets see if using the backup works:
+      try {
+        await resetCache(name);
+        _setInitialHeight();
+      } catch (e) {
+        // we still couldn't get a valid height from the backup?!:
+        // try to use the date instead:
+        try {
+          _setHeightFromDate();
+        } catch (e, s) {
+          // we still couldn't get a valid sync height :/
+          onError?.call(FlutterErrorDetails(
+            exception: e,
+            stack: s,
+            library: this.runtimeType.toString(),
+          ));
+        }
+      }
+    }
 
     try {
       syncStatus = AttemptingSyncStatus();
@@ -339,6 +360,8 @@ abstract class MoneroWalletBase
       if (currentAddressListFile.existsSync()) {
         await currentAddressListFile.rename('$newWalletPath.address.txt');
       }
+
+      await backupWalletFiles(newWalletName);
     } catch (e) {
       final currentWalletPath = await pathForWallet(name: name, type: type);
 
@@ -402,9 +425,7 @@ abstract class MoneroWalletBase
         if (coin.spent == 0) {
           final unspent = MoneroUnspent.fromCoinsInfoRow(coin);
           if (unspent.hash.isNotEmpty) {
-            unspent.isChange = transaction_history
-                .getTransaction(unspent.hash)
-                .direction == 1;
+            unspent.isChange = transaction_history.getTransaction(unspent.hash).direction == 1;
           }
           unspentCoins.add(unspent);
         }
@@ -418,7 +439,7 @@ abstract class MoneroWalletBase
       if (unspentCoins.isNotEmpty) {
         unspentCoins.forEach((coin) {
           final coinInfoList = unspentCoinsInfo.values.where((element) =>
-          element.walletId.contains(id) &&
+              element.walletId.contains(id) &&
               element.accountIndex == walletAddresses.account!.id &&
               element.keyImage!.contains(coin.keyImage!));
 
@@ -438,7 +459,7 @@ abstract class MoneroWalletBase
       _askForUpdateBalance();
     } catch (e, s) {
       print(e.toString());
-      _onError?.call(FlutterErrorDetails(
+      onError?.call(FlutterErrorDetails(
         exception: e,
         stack: s,
         library: this.runtimeType.toString(),
@@ -534,18 +555,36 @@ abstract class MoneroWalletBase
     _listener = monero_wallet.setListeners(_onNewBlock, _onNewTransaction);
   }
 
+  // check if the height is correct:
   void _setInitialHeight() {
     if (walletInfo.isRecovery) {
       return;
     }
 
-    final currentHeight = monero_wallet.getCurrentHeight();
+    final height = monero_wallet.getCurrentHeight();
 
-    if (currentHeight <= 1) {
-      final height = _getHeightByDate(walletInfo.date);
+    if (height > MIN_RESTORE_HEIGHT) {
+      // the restore height is probably correct, so we do nothing:
+      return;
+    }
+
+    throw Exception("height isn't > $MIN_RESTORE_HEIGHT!");
+  }
+
+  void _setHeightFromDate() {
+    if (walletInfo.isRecovery) {
+      return;
+    }
+
+    final height = _getHeightByDate(walletInfo.date);
+
+    if (height > MIN_RESTORE_HEIGHT) {
       monero_wallet.setRecoveringFromSeed(isRecovery: true);
       monero_wallet.setRefreshFromBlockHeight(height: height);
+      return;
     }
+
+    throw Exception("height isn't > $MIN_RESTORE_HEIGHT!");
   }
 
   int _getHeightDistance(DateTime date) {
@@ -561,7 +600,8 @@ abstract class MoneroWalletBase
     final heightDistance = _getHeightDistance(date);
 
     if (nodeHeight <= 0) {
-      return 0;
+      // the node returned 0 (an error state), so lets just restore from cache:
+      throw Exception("nodeHeight is <= 0!");
     }
 
     return nodeHeight - heightDistance;
@@ -650,7 +690,7 @@ abstract class MoneroWalletBase
   }
 
   @override
-  void setExceptionHandler(void Function(FlutterErrorDetails) onError) => _onError = onError;
+  void setExceptionHandler(void Function(FlutterErrorDetails) e) => onError = e;
 
   @override
   String signMessage(String message, {String? address}) {

cw_monero/lib/monero_wallet_service.dart

@@ -11,11 +11,13 @@ import 'package:cw_core/get_height_by_date.dart';
 import 'package:cw_monero/api/exceptions/wallet_opening_exception.dart';
 import 'package:cw_monero/api/wallet_manager.dart' as monero_wallet_manager;
 import 'package:cw_monero/monero_wallet.dart';
+import 'package:flutter/widgets.dart';
 import 'package:hive/hive.dart';
 import 'package:polyseed/polyseed.dart';
 
 class MoneroNewWalletCredentials extends WalletCredentials {
-  MoneroNewWalletCredentials({required String name, required this.language, required this.isPolyseed, String? password})
+  MoneroNewWalletCredentials(
+      {required String name, required this.language, required this.isPolyseed, String? password})
       : super(name: name, password: password);
 
   final String language;
@@ -52,10 +54,8 @@ class MoneroRestoreWalletFromKeysCredentials extends WalletCredentials {
   final String spendKey;
 }
 
-class MoneroWalletService extends WalletService<
-    MoneroNewWalletCredentials,
-    MoneroRestoreWalletFromSeedCredentials,
-    MoneroRestoreWalletFromKeysCredentials> {
+class MoneroWalletService extends WalletService<MoneroNewWalletCredentials,
+    MoneroRestoreWalletFromSeedCredentials, MoneroRestoreWalletFromKeysCredentials> {
   MoneroWalletService(this.walletInfoSource, this.unspentCoinsInfoSource);
 
   final Box<WalletInfo> walletInfoSource;
@@ -112,6 +112,7 @@ class MoneroWalletService extends WalletService<
 
   @override
   Future<MoneroWallet> openWallet(String name, String password) async {
+    MoneroWallet? wallet;
     try {
       final path = await pathForWallet(name: name, type: getType());
 
@@ -119,11 +120,10 @@ class MoneroWalletService extends WalletService<
         await repairOldAndroidWallet(name);
       }
 
-      await monero_wallet_manager
-          .openWalletAsync({'path': path, 'password': password});
-      final walletInfo = walletInfoSource.values.firstWhere(
-          (info) => info.id == WalletBase.idFor(name, getType()));
-      final wallet = MoneroWallet(walletInfo: walletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
+      await monero_wallet_manager.openWalletAsync({'path': path, 'password': password});
+      final walletInfo = walletInfoSource.values
+          .firstWhere((info) => info.id == WalletBase.idFor(name, getType()));
+      wallet = MoneroWallet(walletInfo: walletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
       final isValid = wallet.walletAddresses.validate();
 
       if (!isValid) {
@@ -135,7 +135,7 @@ class MoneroWalletService extends WalletService<
       await wallet.init();
 
       return wallet;
-    } catch (e) {
+    } catch (e, s) {
       // TODO: Implement Exception for wallet list service.
 
       final bool isBadAlloc = e.toString().contains('bad_alloc') ||
@@ -156,16 +156,18 @@ class MoneroWalletService extends WalletService<
       final bool invalidSignature = e.toString().contains('invalid signature') ||
           (e is WalletOpeningException && e.message.contains('invalid signature'));
 
-      if (isBadAlloc ||
-          doesNotCorrespond ||
-          isMissingCacheFilesIOS ||
-          isMissingCacheFilesAndroid ||
-          invalidSignature) {
-        await restoreOrResetWalletFiles(name);
-        return openWallet(name, password);
+      if (!isBadAlloc &&
+          !doesNotCorrespond &&
+          !isMissingCacheFilesIOS &&
+          !isMissingCacheFilesAndroid &&
+          !invalidSignature &&
+          wallet != null &&
+          wallet.onError != null) {
+        wallet.onError!(FlutterErrorDetails(exception: e, stack: s));
       }
 
-      rethrow;
+      await restoreOrResetWalletFiles(name);
+      return openWallet(name, password);
     }
   }
 
@@ -185,10 +187,9 @@ class MoneroWalletService extends WalletService<
   }
 
   @override
-  Future<void> rename(
-      String currentName, String password, String newName) async {
-    final currentWalletInfo = walletInfoSource.values.firstWhere(
-        (info) => info.id == WalletBase.idFor(currentName, getType()));
+  Future<void> rename(String currentName, String password, String newName) async {
+    final currentWalletInfo = walletInfoSource.values
+        .firstWhere((info) => info.id == WalletBase.idFor(currentName, getType()));
     final currentWallet =
         MoneroWallet(walletInfo: currentWalletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
 
@@ -202,8 +203,7 @@ class MoneroWalletService extends WalletService<
   }
 
   @override
-  Future<MoneroWallet> restoreFromKeys(
-      MoneroRestoreWalletFromKeysCredentials credentials) async {
+  Future<MoneroWallet> restoreFromKeys(MoneroRestoreWalletFromKeysCredentials credentials) async {
     try {
       final path = await pathForWallet(name: credentials.name, type: getType());
       await monero_wallet_manager.restoreFromKeys(
@@ -227,9 +227,7 @@ class MoneroWalletService extends WalletService<
   }
 
   @override
-  Future<MoneroWallet> restoreFromSeed(
-      MoneroRestoreWalletFromSeedCredentials credentials) async {
-
+  Future<MoneroWallet> restoreFromSeed(MoneroRestoreWalletFromSeedCredentials credentials) async {
     // Restore from Polyseed
     if (Polyseed.isValidSeed(credentials.mnemonic)) {
       return restoreFromPolyseed(credentials);
@@ -254,14 +252,16 @@ class MoneroWalletService extends WalletService<
     }
   }
 
-  Future<MoneroWallet> restoreFromPolyseed(MoneroRestoreWalletFromSeedCredentials credentials) async {
+  Future<MoneroWallet> restoreFromPolyseed(
+      MoneroRestoreWalletFromSeedCredentials credentials) async {
     try {
       final path = await pathForWallet(name: credentials.name, type: getType());
       final polyseedCoin = PolyseedCoin.POLYSEED_MONERO;
       final lang = PolyseedLang.getByPhrase(credentials.mnemonic);
       final polyseed = Polyseed.decode(credentials.mnemonic, lang, polyseedCoin);
 
-      return _restoreFromPolyseed(path, credentials.password!, polyseed, credentials.walletInfo!, lang);
+      return _restoreFromPolyseed(
+          path, credentials.password!, polyseed, credentials.walletInfo!, lang);
     } catch (e) {
       // TODO: Implement Exception for wallet list service.
       print('MoneroWalletsManager Error: $e');
@@ -269,11 +269,11 @@ class MoneroWalletService extends WalletService<
     }
   }
 
-  Future<MoneroWallet> _restoreFromPolyseed(String path, String password, Polyseed polyseed,
-      WalletInfo walletInfo, PolyseedLang lang,
+  Future<MoneroWallet> _restoreFromPolyseed(
+      String path, String password, Polyseed polyseed, WalletInfo walletInfo, PolyseedLang lang,
       {PolyseedCoin coin = PolyseedCoin.POLYSEED_MONERO, int? overrideHeight}) async {
-    final height = overrideHeight ?? getMoneroHeigthByDate(
-        date: DateTime.fromMillisecondsSinceEpoch(polyseed.birthday * 1000));
+    final height = overrideHeight ??
+        getMoneroHeigthByDate(date: DateTime.fromMillisecondsSinceEpoch(polyseed.birthday * 1000));
     final spendKey = polyseed.generateKey(coin, 32).toHexString();
     final seed = polyseed.encode(lang, coin);
 
@@ -288,8 +288,7 @@ class MoneroWalletService extends WalletService<
         restoreHeight: height,
         spendKey: spendKey);
 
-    final wallet = MoneroWallet(
-        walletInfo: walletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
+    final wallet = MoneroWallet(walletInfo: walletInfo, unspentCoinsInfo: unspentCoinsInfoSource);
     await wallet.init();
 
     return wallet;
@@ -301,16 +300,14 @@ class MoneroWalletService extends WalletService<
         return;
       }
 
-      final oldAndroidWalletDirPath =
-          await outdatedAndroidPathForWalletDir(name: name);
+      final oldAndroidWalletDirPath = await outdatedAndroidPathForWalletDir(name: name);
       final dir = Directory(oldAndroidWalletDirPath);
 
       if (!dir.existsSync()) {
         return;
       }
 
-      final newWalletDirPath =
-          await pathForWalletDir(name: name, type: getType());
+      final newWalletDirPath = await pathForWalletDir(name: name, type: getType());
 
       dir.listSync().forEach((f) {
         final file = File(f.path);

cw_nano/lib/nano_wallet_service.dart

@@ -69,6 +69,7 @@ class NanoWalletService extends WalletService<NanoNewWalletCredentials,
         NanoWallet(walletInfo: currentWalletInfo, password: password, mnemonic: randomWords);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());
@@ -150,14 +151,29 @@ class NanoWalletService extends WalletService<NanoNewWalletCredentials,
   Future<NanoWallet> openWallet(String name, String password) async {
     final walletInfo =
         walletInfoSource.values.firstWhere((info) => info.id == WalletBase.idFor(name, getType()));
-    final wallet = await NanoWalletBase.open(
-      name: name,
-      password: password,
-      walletInfo: walletInfo,
-    );
 
-    await wallet.init();
-    await wallet.save();
-    return wallet;
+    try {
+      final wallet = await NanoWalletBase.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
+
+      await wallet.init();
+      await wallet.save();
+      saveBackup(name);
+      return wallet;
+    } catch (_) {
+      await restoreWalletFilesFromBackup(name);
+      final wallet = await NanoWalletBase.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
+
+      await wallet.init();
+      await wallet.save();
+      return wallet;
+    }
   }
 }

cw_polygon/lib/polygon_wallet_service.dart

@@ -42,16 +42,31 @@ class PolygonWalletService extends EVMChainWalletService<PolygonWallet> {
   Future<PolygonWallet> openWallet(String name, String password) async {
     final walletInfo =
         walletInfoSource.values.firstWhere((info) => info.id == WalletBase.idFor(name, getType()));
-    final wallet = await PolygonWallet.open(
-      name: name,
-      password: password,
-      walletInfo: walletInfo,
-    );
 
-    await wallet.init();
-    await wallet.save();
+    try {
+      final wallet = await PolygonWallet.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
 
-    return wallet;
+      await wallet.init();
+      await wallet.save();
+      saveBackup(name);
+      return wallet;
+    } catch (_) {
+      await restoreWalletFilesFromBackup(name);
+
+      final wallet = await PolygonWallet.open(
+        name: name,
+        password: password,
+        walletInfo: walletInfo,
+      );
+      
+      await wallet.init();
+      await wallet.save();
+      return wallet;
+    }
   }
 
   @override
@@ -100,6 +115,7 @@ class PolygonWalletService extends EVMChainWalletService<PolygonWallet> {
         password: password, name: currentName, walletInfo: currentWalletInfo);
 
     await currentWallet.renameWalletFiles(newName);
+    await saveBackup(newName);
 
     final newWalletInfo = currentWalletInfo;
     newWalletInfo.id = WalletBase.idFor(newName, getType());