StreamController to manage Firebase Authentication - firebase

Question

I am having a hard time with the following Firebase login flow. I created a StreamController to listen primarily listen to the OnAuthStateChanged stream of Firebase, and added a data point to this stream (a User object with additional data I fetched from Firestore). My place would be to listen to that StreamController's stream elsewhere in my application in order to grab the user's full info.
My AuthService class:
import 'dart:async';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:dispatch/models/user.dart';
import 'package:firebase_auth/firebase_auth.dart';
class AuthService {
static FirebaseAuth _auth = FirebaseAuth.instance;
static Firestore _dbReference = Firestore.instance;
final authStreamController = setStreamController();
// create User, we will need to fetch more information from Firestore in the future
Future<User> _userFromFirebaseUser(FirebaseUser user) async {
//return user != null ? User(uid:user.uid) : null;
return user != null ? (await _getUserDetailsAsync(User(uid:user.uid))) : null;
}
// get user details data
Future<User> _getUserDetailsAsync(User user) async {
try {
QuerySnapshot querySnapshot = await _dbReference.collection('user-details')
.where('auth_id', isEqualTo: user.uid)
.getDocuments();
Map<String, dynamic> userInfo = querySnapshot.documents.first.data;
user.email = userInfo['email'] != null ? userInfo['email'] : null;
user.firstName = userInfo['first_name'] != null ? userInfo['first_name'] : null;
user.lastName = userInfo['last_name'] != null ? userInfo['last_name'] : null;
return user;
} catch(e) {
print(e.toString());
return null;
}
}
// define a stream controller with the OnAuthStateChanged stream as its stream
static StreamController<User> setStreamController(){
StreamController<User> authStreamController = StreamController();
Stream<User> _stream = _auth.onAuthStateChanged.map((FirebaseUser user) => User(uid: user.uid));
authStreamController.addStream(_stream);
return authStreamController;
}
// expose stream controller via a getter
StreamController<User> get streamControllerGetter {
return authStreamController;
}
// sign with email and password
Future signInWithUserAndPassword(String email, String password) async {
try {
AuthResult result = await _auth.signInWithEmailAndPassword(email: email, password: password);
FirebaseUser user = result.user;
// fetch the user's details from Cloud Firestore
// return final user
User appUser = await _userFromFirebaseUser(user);
authStreamController.sink.add(appUser);
return appUser;
} catch(e) {
print(e.toString());
return null;
}
}
// sign out
Future signOut() async {
try {
return await _auth.signOut();
} catch(e) {
print('Sign out failed:');
print(e.toString());
return null;
}
}
}
MyApp class
class MyApp extends StatelessWidget {
// wrap MaterialApp widget with Provider
return StreamProvider<User>.value(
//listening to the user change stream
value: AuthService().streamControllerGetter.stream,
child: MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: LoginWrapper(),
),
);
}
For some reason, this whole thing doesn't work, I don't seem to receive the last User object I added to the sink of the StreamController. Any ideas?