[ Not yet provided token to Request Interceptor || OK in debug NOK in release ]

[Gobmichet]

Hi,

We have a "wierd" problem we can't reproduce in debug mode but that does appear in release.

• We do have on servers' logs an "error 500 : no-header" for a specific WS call when it is called on BG/FG.
• ONLY the authorization header is concerned, the "app-version" is ALWAYS here !
• This very call is well done when happening just after the user's login.
• This very call is "always" well done when in debug mode ! (i tried but can't reproduce it on emulator AND physical device when launched from AndroidStudio)

I'm convinced (look at the interceptor's code below) that the only thing that can happen is that the userDao used to retrieve the token isn't correctly provided at the time it is used by the request interceptor and therefore passes into the following code from interceptor :
print(">> Authorization token NULL ! <<");

Additionnal infos :
We use :

• Retrofit over Dio for WS calls
• Hive for database (NoSql)

Here is the relevant code used :

Request Interceptor (Dio) :

import 'package:provider/src/provider.dart';
import '../model/entities/user.dart';

late BuildContext _mainContext;
void init(BuildContext c) => _mainContext = c;

class TokenInterceptor extends Interceptor {

  UserDao _userDao = _mainContext.read();
  User? _currUser;

  @override
  Future<void> onRequest(RequestOptions options, RequestInterceptorHandler handler) async {
    final info = await PackageInfo.fromPlatform();
    options.headers["App-Version"] = info.version;
    await _userDao.getCurrentUser().then((value) => _currUser = value);
    if (_currUser != null) {
      options.headers["Authorization"] =  _currUser.accessToken;
    } else {
      print(">> Authorization token NULL ! <<");
    }
    super.onRequest(options, handler);
  }

  @override
  void onError(DioError err, ErrorInterceptorHandler handler) {
    super.onError(err, handler);
  }

  @override
  void onResponse(Response response, ResponseInterceptorHandler handler) {
    super.onResponse(response, handler);
  }
}

triggered into the homepage.dart like following :

@override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    switch (state) {
      case AppLifecycleState.resumed:
        if (_isLogged) {
              _userController.MajUserInfos(context);
        }
        break;
      default:
        // nothing
    }
  }

Is there a way to WAIT for the provided resource in our dart code ? (we use the "late" word when declaring the UserDao)
So that we'd be sure that the interceptor really got the userDao in order to retrieve the user and it's token ?
'Cause the userDao should never be null since it is initialized in the main.dart as this :

@override
  Widget build(BuildContext context) {
    return MultiProvider(
      providers: [
        [...]
        Provider(create: (c) => UserDao() ),
        [...]
      ],

and that the code is only triggered if the user is logged...

Thanks in advance for your help !
We're quite disappointed to be honnest.