some codes don't work. i dont know why. how can i make the codes work? - firebase

Question

I wanna make Login screen in unity. I'm gonna use firebase, and followed the manual in firebase page and some youtube channel to learn how to use firebase.
and.. some codes don't work. I used the codes that firebase give, and the codes that are below login success don't work. um.. sorry for my weak English. please see the codes. thanks.
this codes don't work
authUI.ShowLoggedInPanel();// 로그인 성공 시 메인메뉴로 전환!
authUI.LoggedInUserEmail.text = newUser.Email;
I don't know what i can try..
private void TryLoginWithFirebaseAuth(string email, string password) // 기존 사용자 로그인
{
auth.SignInWithEmailAndPasswordAsync(email, password).ContinueWith(task =>
{
if (task.IsCanceled)
{
Debug.LogError("SignInWithEmailAndPasswordAsync was canceled.");
return;
}
if (task.IsFaulted)
{
Debug.LogError("SignInWithEmailAndPasswordAsync encountered an error: " + task.Exception);
return;
}
// 로그인 성공 (Maybe Login success?)
Firebase.Auth.FirebaseUser newUser = task.Result;
Debug.LogFormat("User signed in successfully: {0} ({1})",
newUser.DisplayName, newUser.UserId);
authUI.ShowLoggedInPanel();// 로그인 성공 시 메인메뉴로 전환!
authUI.LoggedInUserEmail.text = newUser.Email;
});
}
It doesn't show the error to me. but just.. it doesn't work.
Could someone help me out here.

Answer 1

I don't know Firebase well but the issue might be the threading.
All (the most) Unity API calls have to be done in the main thread. Since Firebase executes its stuff async in a background thread some calls might simply fail.
You should rather use an Action parameter in order to pass a callback to the method like e.g.
private void TryLoginWithFirebaseAuth(string email, string password, Action<Firebase.Auth.FirebaseUser> successCallback) // 기존 사용자 로그인
{
auth.SignInWithEmailAndPasswordAsync(email, password).ContinueWith(task =>
{
if (task.IsCanceled)
{
Debug.LogError("SignInWithEmailAndPasswordAsync was canceled.");
return;
}
if (task.IsFaulted)
{
Debug.LogError("SignInWithEmailAndPasswordAsync encountered an error: " + task.Exception);
return;
}
// 로그인 성공 (Maybe Login success?)
Firebase.Auth.FirebaseUser newUser = task.Result;
successCallback?Invoke(newUser);
});
}
and use it like
TryLoginWithFirebaseAuth(someName, somePassword, onSuccess =>
{
Debug.LogFormat("User signed in successfully: {0} ({1})",
onSuccess.DisplayName, onSuccess.UserId);
authUI.ShowLoggedInPanel();// 로그인 성공 시 메인메뉴로 전환!
authUI.LoggedInUserEmail.text = onSuccess.Email;
}
this makes sure it is definitely executed in the Unity main thread.

Answer 2

It's hard to definitely answer your question without more context around it (ex: are there any useful logs in the Unity console?).
Some things to note:
You have to make sure you've setup Authentication in the Firebase Console. This means clicking Authentication in your side bar and explicitly enabling the methods you want:
Similarly, you need to make sure that your applications are properly setup. Your package id/bundle id (Android/iOS) need to match what's in your console. Similarly, you need to upload the SHA1 of your signing certificate to get it to work in Android.
I'm assuming that you're just debugging for now, so you can get your debug certificate here: https://developers.google.com/android/guides/client-auth
You'll want to open up project settings:
And add your fingerprint there:
Following up on #derHugo's suggest, threading may be an issue in addition to the basic setup instructions above. I wrote a post recently on how to work with threading and Firebase in Unity here: https://firebase.googleblog.com/2019/07/firebase-and-tasks-how-to-deal-with.html
The easiest way to make your code thread safe would be to replace ContinueWith with ContinueWithOnMainThread. This is an extension method on Task provided by the Firebase plugin to make it easier to work with.
I hope that all helps!

Answer 3

This is a classic Task continuation problem in Unity using Firebase. When you use, ContinueWith it is not ensured to be called on the main Unity thread. What you're trying to do authUI.ShowLoggedInPanel();authUI.LoggedInUserEmail.text = newUser.Email; requires to be executed on the Unity main thread. If you try to access GameObjects inside ContinueWith, that will fail. The code just ghosts out without any error in the console.
The solution:
Instead of ContinueWith, use ContinueWithOnMainThread from Firebase extensions which was made exactly for this reason.