chore: Better error handling for push notifications

lib/pages/chat_list/chat_list.dart

@@ -15,6 +15,7 @@ import 'package:receive_sharing_intent/receive_sharing_intent.dart';
 import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/pages/chat_list/chat_list_view.dart';
+import 'package:fluffychat/utils/error_reporter.dart';
 import 'package:fluffychat/utils/localized_exception_extension.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions/matrix_locals.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
@@ -420,6 +421,8 @@ class ChatListController extends State<ChatList>
 
     _checkTorBrowser();
 
+    ErrorReporter(context).consumeTemporaryErrorLogFile();
+
     super.initState();
   }
 

lib/utils/error_reporter.dart

@@ -1,9 +1,13 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 import 'package:flutter_highlighter/flutter_highlighter.dart';
 import 'package:flutter_highlighter/themes/shades-of-purple.dart';
 import 'package:matrix/matrix.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
 import 'package:url_launcher/url_launcher.dart';
 
 import 'package:fluffychat/config/app_config.dart';
@@ -11,16 +15,44 @@ import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/widgets/adaptive_dialogs/adaptive_dialog_action.dart';
 
 class ErrorReporter {
-  final BuildContext context;
+  final BuildContext? context;
   final String? message;
 
   const ErrorReporter(this.context, [this.message]);
 
-  void onErrorCallback(Object error, [StackTrace? stackTrace]) async {
+  Future<File> _getTemporaryErrorLogFile() async {
+    final tempDir = await getTemporaryDirectory();
+    return File(path.join(tempDir.path, 'error_log.txt'));
+  }
+
+  Future<void> writeToTemporaryErrorLogFile(
+    Object error, [
+    StackTrace? stackTrace,
+  ]) async {
+    final file = await _getTemporaryErrorLogFile();
+    if (await file.exists()) await file.delete();
+    await file.writeAsString(
+      '[${DateTime.now().toIso8601String()}] $message -  $error\n$stackTrace',
+    );
+  }
+
+  Future<void> consumeTemporaryErrorLogFile() async {
+    final file = await _getTemporaryErrorLogFile();
+    if (!(await file.exists())) return;
+    final content = await file.readAsString();
+
+    _onErrorCallback(content);
+  }
+
+  void onErrorCallback(Object error, [StackTrace? stackTrace]) {
     Logs().e(message ?? 'Error caught', error, stackTrace);
     final text = '$error\n${stackTrace ?? ''}';
+    return _onErrorCallback(text);
+  }
+
+  void _onErrorCallback(String text) async {
     await showAdaptiveDialog(
-      context: context,
+      context: context!,
       builder: (context) => AlertDialog.adaptive(
         title: Text(L10n.of(context).reportErrorDescription),
         content: SizedBox(

lib/utils/push_helper.dart

@@ -14,6 +14,7 @@ import 'package:fluffychat/config/app_config.dart';
 import 'package:fluffychat/l10n/l10n.dart';
 import 'package:fluffychat/utils/client_download_content_extension.dart';
 import 'package:fluffychat/utils/client_manager.dart';
+import 'package:fluffychat/utils/error_reporter.dart';
 import 'package:fluffychat/utils/matrix_sdk_extensions/matrix_locals.dart';
 import 'package:fluffychat/utils/platform_infos.dart';
 
@@ -35,7 +36,10 @@ Future<void> pushHelper(
       flutterLocalNotificationsPlugin: flutterLocalNotificationsPlugin,
     );
   } catch (e, s) {
-    Logs().v('Push Helper has crashed!', e, s);
+    Logs().e('Push Helper has crashed! Writing into temporary file', e, s);
+
+    const ErrorReporter(null, 'Push Helper has crashed!')
+        .writeToTemporaryErrorLogFile(e, s);
 
     l10n ??= await lookupL10n(const Locale('en'));
     flutterLocalNotificationsPlugin.show(