Best practice awaiting an async GetxService initialization

[wottpal]

Hey there,

I have a (singleton) service with an async init() function. I would like it to be awaited before other services are initialized.

First I tried overwriting the onInit() function asynchronously, which compiled fine but didn't await the execution. Then I used the putAsync function which works fine so far but I'm wondering if that's the best practice as it looks like a lot of boilerplate when doing it with a lot of services.

  await Get.putAsync(() async {
    final instance = UserGameService();
    await instance.init();
    return instance;
  }, permanent: true);

[maares]

I'm also interested in hearing best practices for this subject. I can share example what I currently use in my project.

Basically before running app I raise up any async dependency for services or helpers and then init app, in particular the FireBase dependencies for background Messages when app is closed, but you can extend to any service needed.

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await ServicesSer().dependencies(); <--- here

  runApp(
    GetMaterialApp.router(
      title: "Yaguarete",
      debugShowCheckedModeBanner: false,
      theme: ThemeData.light(),
      darkTheme: ThemeData.dark(),
      themeMode: ThemeMode.light,
      locale: TranslationService.locale,
      fallbackLocale: TranslationService.fallbackLocale,
      translations: TranslationService(),
      initialBinding: BindingsBuilder(
        () {
          Get.put(AppHelperCtrl(), permanent: true);
          Get.put(StorageCtrl(), permanent: true);
          Get.put(FirebaseStorageSer(), permanent: true);
          Get.put(TranslationService(), permanent: true);
          Get.put(WebSessionStorage(), permanent: true);
        },
      ),
      getPages: AppPages.routes,
    ),
  );
}

class ServicesSer extends Bindings {
  @override
  Future<void> dependencies() async {
    if (GetPlatform.isWeb) {
      FacebookAuth.instance.webInitialize(
        appId: "XXXX",
        cookie: true,
        xfbml: true,
        version: "v9.0",
      );
    }

    //init firebase dependencies
    await Get.putAsync<FirebaseAuthSer>(() async {
      final firebaseAuthSer = FirebaseAuthSer();
      await firebaseAuthSer.firebaseAuthSerInit();
      return firebaseAuthSer;
    }, permanent: true);

    await GetStorage.init();

    /// other services

    print('ServicesSer has finished');
  }
}