cake_wallet/lib/utils/exception_handler.dart

import 'dart:io';

import 'package:cake_wallet/entities/preferences_key.dart';
import 'package:cake_wallet/generated/i18n.dart';
import 'package:cake_wallet/main.dart';
import 'package:cake_wallet/src/widgets/alert_with_two_actions.dart';
import 'package:cake_wallet/utils/show_pop_up.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter_mailer/flutter_mailer.dart';
import 'package:package_info/package_info.dart';
import 'package:path_provider/path_provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

class ExceptionHandler {
  static bool _hasError = false;
  static const _coolDownDurationInDays = 7;

  static void _saveException(String? error, StackTrace? stackTrace, {String? library}) async {
    final appDocDir = await getApplicationDocumentsDirectory();

    final file = File('${appDocDir.path}/error.txt');
    final exception = {
      "${DateTime.now()}": {
        "Error": "$error\n\n",
        "Library": "$library\n\n",
        "StackTrace": stackTrace.toString(),
      }
    };

    const String separator = '''\n\n==========================================================
      ==========================================================\n\n''';

    file.writeAsStringSync(
      "$exception $separator",
      mode: FileMode.append,
    );
  }

  static void _sendExceptionFile() async {
    try {
      final appDocDir = await getApplicationDocumentsDirectory();

      final file = File('${appDocDir.path}/error.txt');

      await _addDeviceInfo(file);

      final MailOptions mailOptions = MailOptions(
        subject: 'Mobile App Issue',
        recipients: ['support@cakewallet.com'],
        attachments: [file.path],
      );

      final result = await FlutterMailer.send(mailOptions);

      // Clear file content if the error was sent or saved.
      // On android we can't know if it was sent or saved
      if (result.name == MailerResponse.sent.name ||
          result.name == MailerResponse.saved.name ||
          result.name == MailerResponse.android.name) {
        file.writeAsString("", mode: FileMode.write);
      }
    } catch (e, s) {
      _saveException(e.toString(), s);
    }
  }

  static void onError(FlutterErrorDetails errorDetails) async {
    if (kDebugMode) {
      FlutterError.presentError(errorDetails);
      debugPrint(errorDetails.toString());
      return;
    }

    if (_ignoreError(errorDetails.exception.toString())) {
      return;
    }

    _saveException(
      errorDetails.exceptionAsString(),
      errorDetails.stack,
      library: errorDetails.library,
    );

    final sharedPrefs = await SharedPreferences.getInstance();

    final lastPopupDate =
        DateTime.tryParse(sharedPrefs.getString(PreferencesKey.lastPopupDate) ?? '') ??
            DateTime.now().subtract(Duration(days: _coolDownDurationInDays + 1));

    final durationSinceLastReport = DateTime.now().difference(lastPopupDate).inDays;

    if (_hasError || durationSinceLastReport < _coolDownDurationInDays) {
      return;
    }
    _hasError = true;

    sharedPrefs.setString(PreferencesKey.lastPopupDate, DateTime.now().toString());

    WidgetsBinding.instance.addPostFrameCallback(
      (timeStamp) async {
        await showPopUp<void>(
          context: navigatorKey.currentContext!,
          builder: (context) {
            return AlertWithTwoActions(
              isDividerExist: true,
              alertTitle: S.of(context).error,
              alertContent: S.of(context).error_dialog_content,
              rightButtonText: S.of(context).send,
              leftButtonText: S.of(context).do_not_send,
              actionRightButton: () {
                Navigator.of(context).pop();
                _sendExceptionFile();
              },
              actionLeftButton: () {
                Navigator.of(context).pop();
              },
            );
          },
        );

        _hasError = false;
      },
    );
  }

  /// Ignore User related errors or system errors
  static bool _ignoreError(String error) =>
      _ignoredErrors.any((element) => error.contains(element));

  static const List<String> _ignoredErrors = const [
    "errno = 9", // SocketException: Bad file descriptor
    "errno = 28", // OS Error: No space left on device
    "errno = 32", // SocketException: Write failed (OS Error: Broken pipe)
    "errno = 49", // SocketException: Can't assign requested address
    "errno = 54", // SocketException: Connection reset by peer
    "errno = 57", // SocketException: Read failed (OS Error: Socket is not connected)
    "errno = 60", // SocketException: Operation timed out
    "errno = 65", // SocketException: No route to host
    "errno = 103", // SocketException: Software caused connection abort
    "errno = 104", // SocketException: Connection reset by peer
    "errno = 110", // SocketException: Connection timed out
    "Connection reset by peer",
    "Connection closed before full header was received",
    "Connection terminated during handshake",
    "PERMISSION_NOT_GRANTED",
  ];

  static Future<void> _addDeviceInfo(File file) async {
    final packageInfo = await PackageInfo.fromPlatform();
    final currentVersion = packageInfo.version;

    final deviceInfoPlugin = DeviceInfoPlugin();
    Map<String, dynamic> deviceInfo = {};

    if (Platform.isAndroid) {
      deviceInfo = _readAndroidBuildData(await deviceInfoPlugin.androidInfo);
      deviceInfo["Platform"] = "Android";
    } else if (Platform.isIOS) {
      deviceInfo = _readIosDeviceInfo(await deviceInfoPlugin.iosInfo);
      deviceInfo["Platform"] = "iOS";
    } else if (Platform.isLinux) {
      deviceInfo = _readLinuxDeviceInfo(await deviceInfoPlugin.linuxInfo);
      deviceInfo["Platform"] = "Linux";
    } else if (Platform.isMacOS) {
      deviceInfo = _readMacOsDeviceInfo(await deviceInfoPlugin.macOsInfo);
      deviceInfo["Platform"] = "MacOS";
    } else if (Platform.isWindows) {
      deviceInfo = _readWindowsDeviceInfo(await deviceInfoPlugin.windowsInfo);
      deviceInfo["Platform"] = "Windows";
    }

    await file.writeAsString(
      "App Version: $currentVersion\n\nDevice Info $deviceInfo\n\n",
      mode: FileMode.append,
    );
  }

  static Map<String, dynamic> _readAndroidBuildData(AndroidDeviceInfo build) {
    return <String, dynamic>{
      'brand': build.brand,
      'device': build.device,
      'manufacturer': build.manufacturer,
      'model': build.model,
      'product': build.product,
    };
  }

  static Map<String, dynamic> _readIosDeviceInfo(IosDeviceInfo data) {
    return <String, dynamic>{
      'systemName': data.systemName,
      'systemVersion': data.systemVersion,
      'model': data.model,
      'localizedModel': data.localizedModel,
      'isPhysicalDevice': data.isPhysicalDevice,
    };
  }

  static Map<String, dynamic> _readLinuxDeviceInfo(LinuxDeviceInfo data) {
    return <String, dynamic>{
      'name': data.name,
      'version': data.version,
      'versionCodename': data.versionCodename,
      'versionId': data.versionId,
      'prettyName': data.prettyName,
      'buildId': data.buildId,
      'variant': data.variant,
      'variantId': data.variantId,
    };
  }

  static Map<String, dynamic> _readMacOsDeviceInfo(MacOsDeviceInfo data) {
    return <String, dynamic>{
      'arch': data.arch,
      'model': data.model,
      'kernelVersion': data.kernelVersion,
      'osRelease': data.osRelease,
    };
  }

  static Map<String, dynamic> _readWindowsDeviceInfo(WindowsDeviceInfo data) {
    return <String, dynamic>{
      'majorVersion': data.majorVersion,
      'minorVersion': data.minorVersion,
      'buildNumber': data.buildNumber,
      'productType': data.productType,
      'productName': data.productName,
    };
  }
}