Firebase为什么偶尔登录不认证？

Question

So I have a weird bug that I can't seem to track down. I'm using firebase functions on the backend and SwiftUI. My login flow goes like this:

User logs in from loginView. The loginView then uses a callback to pass a user to move on to the next View after a user logs in.

After this a user is passed to the View where it calls the firebase functions.

The problem is that every once in a while a user fails authentication. This doesn't happen every time and usually happens when a user has not logged in for 12 hours or more. I thought it may have been a race condition at first but after further investigation decided that it wasn't given the fact that it's using a callback.

Has anyone else experienced anything similar? If so is there any way to fix this?

I have tried making my firebase function stay warm by setting minimum instances to 1 because I initially thought it may be a cold start issue but this hasn't helped.

Any help would be greatly appreciated. Thanks.

On the frontend the code is pulling like so:

        FirebaseAuthService().signIn(email: email, password: password) { result, error in
        if (error?.occurred) != nil {
            self.errorMessage = error!.details
            self.state = .failed
            self.showErrorAlert = true
            return
        }
        
        if (localAuthEnabled) {
          ...... This piece of code works

        FirebaseFirestoreService().fetchUser(userID: result?.user.uid ?? "", completion: { user, error 

               ....... This piece of code works.
            }
        })
    }

User is then taken to another view AFTER logging in

This view pulls from 5 or so firebase functions asynchronously (but the user is already logged in by this point). The function that it fails at is as follows

   self.function.httpsCallable("api-report").call() { (result, error) in
       ... It is at times it gives me an auth error inside of this function.
           
  }

I am using this to log out whenever a user put the app in the background or hits the log out button:

    func signOut() -> Bool {
    do {
        try Auth.auth().signOut()
        self.session = nil
        return true
    } catch let err as NSError {
        print("Error signing out: %@", err)
        return false
    }
}

on the backend the report call does the following with the report. This is a large function. I have only added the call to show whats going on.

exports.handler = async (data, context) => {
    if (!context.auth) {
        console.log("report error context");
        console.log(context);
        throw new functions.https.HttpsError('failed-precondition', 'The function must be called ' +
            'by authenticated users.', 'User must be authenticated');
    }
}

Answer 1

It seems the call to your backend may be happening just as/after the user is logged out, or their token is being refreshed. If it's the token being refreshed, the client should just retry the call in cases such as this.

You could also check whether the token is about to expire, and force a refresh when that is the case, or delay calling the Cloud Function until the token has refreshed.