Some cleanup and better error handling

Author: lfkellogg

firebase-appdistribution/src/main/java/com/google/firebase/appdistribution/FirebaseAppDistributionLifecycleNotifier.java

@@ -83,6 +83,13 @@ interface OnActivityDestroyedListener {
     void onDestroyed(Activity activity);
   }
 
+  /**
+   * Get a {@link Task} that will succeed with a result of the app's foregrounded {@link Activity},
+   * when one is available.
+   *
+   * <p>The returned task will never fail. It will instead remain pending indefinitely until some
+   * activity comes to the foreground.
+   */
   Task<Activity> getForegroundActivity() {
     synchronized (lock) {
       if (currentActivity != null) {

firebase-appdistribution/src/main/java/com/google/firebase/appdistribution/TesterSignInManager.java

@@ -15,7 +15,6 @@
 package com.google.firebase.appdistribution;
 
 import static com.google.firebase.appdistribution.FirebaseAppDistributionException.Status.AUTHENTICATION_CANCELED;
-import static com.google.firebase.appdistribution.FirebaseAppDistributionException.Status.AUTHENTICATION_FAILURE;
 import static com.google.firebase.appdistribution.TaskUtils.combineWithResultOf;
 import static com.google.firebase.appdistribution.TaskUtils.safeSetTaskException;
 import static com.google.firebase.appdistribution.TaskUtils.safeSetTaskResult;
@@ -29,11 +28,13 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.VisibleForTesting;
 import androidx.browser.customtabs.CustomTabsIntent;
+import com.google.android.gms.tasks.OnFailureListener;
 import com.google.android.gms.tasks.Task;
 import com.google.android.gms.tasks.TaskCompletionSource;
 import com.google.android.gms.tasks.Tasks;
 import com.google.firebase.FirebaseApp;
 import com.google.firebase.appdistribution.Constants.ErrorMessages;
+import com.google.firebase.appdistribution.FirebaseAppDistributionException.Status;
 import com.google.firebase.appdistribution.internal.InstallActivity;
 import com.google.firebase.appdistribution.internal.LogWrapper;
 import com.google.firebase.appdistribution.internal.SignInResultActivity;
@@ -120,7 +121,6 @@ void onActivityStarted(Activity activity) {
 
   @NonNull
   public Task<Void> signInTester() {
-
     if (signInStorage.getSignInStatus()) {
       LogWrapper.getInstance().v(TAG + "Tester is already signed in.");
       return Tasks.forResult(null);
@@ -140,6 +140,7 @@ public Task<Void> signInTester() {
       firebaseInstallationsApiProvider
           .get()
           .getId()
+          .addOnFailureListener(handleTaskFailure(ErrorMessages.AUTHENTICATION_ERROR, Status.AUTHENTICATION_FAILURE))
           .onSuccessTask(combineWithResultOf(lifecycleNotifier.getForegroundActivity()))
           .addOnSuccessListener(
               fidAndActivity -> {
@@ -148,18 +149,22 @@ public Task<Void> signInTester() {
                   hasBeenSentToBrowserForCurrentTask = true;
                 }
               })
-          .addOnFailureListener(
-              e -> {
-                LogWrapper.getInstance().e(TAG + "Fid retrieval failed.", e);
-                setSignInTaskCompletionError(
-                    new FirebaseAppDistributionException(
-                        ErrorMessages.AUTHENTICATION_ERROR, AUTHENTICATION_FAILURE, e));
-              });
+          // No failures expected here, since getForegroundActivity() will wait indefinitely for a
+          // foreground activity, but catch any unexpected failures to be safe.
+          .addOnFailureListener(handleTaskFailure(ErrorMessages.UNKNOWN_ERROR, Status.UNKNOWN));
 
       return signInTaskCompletionSource.getTask();
     }
   }
 
+  private OnFailureListener handleTaskFailure(String message, Status status) {
+    return e -> {
+      LogWrapper.getInstance().e(TAG + message, e);
+      setSignInTaskCompletionError(
+          new FirebaseAppDistributionException(message, status, e));
+    };
+  }
+
   private boolean awaitingResultFromBrowser() {
     synchronized (signInTaskLock) {
       return signInTaskCompletionSource != null
@@ -168,15 +173,15 @@ private boolean awaitingResultFromBrowser() {
     }
   }
 
-  private void setSuccessfulSignInResult() {
+  private void setSignInTaskCompletionError(FirebaseAppDistributionException e) {
     synchronized (signInTaskLock) {
-      safeSetTaskResult(signInTaskCompletionSource, null);
+      safeSetTaskException(signInTaskCompletionSource, e);
     }
   }
 
-  private void setSignInTaskCompletionError(FirebaseAppDistributionException e) {
+  private void setSuccessfulSignInResult() {
     synchronized (signInTaskLock) {
-      safeSetTaskException(signInTaskCompletionSource, e);
+      safeSetTaskResult(signInTaskCompletionSource, null);
     }
   }