before

lib/blocs/sing_in_bloc/sign_in_bloc.dart

@@ -14,18 +14,35 @@ class SignInBloc extends Bloc<SignInEvent, SignInState> {
   SignInBloc({required UserRepository userRepository})
       : _userRepository = userRepository,
         super(SignInInitial()) {
-    on<SignInRequired>((event, emit) async {
-      emit(SignInProcess());
+    userRepository.streamUser().listen((authUser) {
       try {
-        await _userRepository.signIn(event.email, event.password);
-        emit(SignInSuccess());
+        if (authUser == null) {
+          emit(SignInFailure());
+        } else {
+          emit(SignInSuccess());
+        }
       } catch (e) {
         log(e.toString());
-        emit(const SignInFailure());
       }
     });
-    on<SignOutRequired>((event, emit) async {
-      await _userRepository.logOut();
-    });
+    on<SignInRequired>(_onSignInRequired);
+    on<SignOutRequired>(_onSignOutRequired);
+  }
+
+  void _onSignInRequired(
+      SignInRequired event, Emitter<SignInState> emit) async {
+    emit(SignInProcess());
+    try {
+      await _userRepository.signIn(event.email, event.password);
+      emit(SignInSuccess());
+    } catch (e) {
+      log(e.toString());
+      emit(const SignInFailure());
+    }
+  }
+
+  void _onSignOutRequired(
+      SignOutRequired event, Emitter<SignInState> emit) async {
+    await _userRepository.logOut();
   }
 }