Improve resiliance of FCM fetch.

app/src/main/java/org/thoughtcrime/securesms/gcm/FcmFetchManager.kt

@@ -40,8 +40,11 @@ object FcmFetchManager {
   @Volatile
   private var startedForeground = false
 
+  /**
+   * @return True if a service was successfully started, otherwise false.
+   */
   @JvmStatic
-  fun enqueue(context: Context, foreground: Boolean) {
+  fun enqueue(context: Context, foreground: Boolean): Boolean {
     synchronized(this) {
       try {
         if (foreground) {
@@ -63,8 +66,11 @@ object FcmFetchManager {
         }
       } catch (e: IllegalStateException) {
         Log.w(TAG, "Failed to start service!", e)
+        return false
       }
     }
+
+    return true
   }
 
   private fun fetch(context: Context) {

app/src/main/java/org/thoughtcrime/securesms/gcm/FcmReceiveService.java

@@ -78,18 +78,25 @@ public class FcmReceiveService extends FirebaseMessagingService {
   }
 
   private static void handleReceivedNotification(Context context, @Nullable RemoteMessage remoteMessage) {
+    boolean enqueueSuccessful;
+
     try {
       long timeSinceLastRefresh = System.currentTimeMillis() - SignalStore.misc().getLastFcmForegroundServiceTime();
       Log.d(TAG, String.format(Locale.US, "[handleReceivedNotification] API: %s, FeatureFlag: %s, RemoteMessagePriority: %s, TimeSinceLastRefresh: %s ms", Build.VERSION.SDK_INT, FeatureFlags.useFcmForegroundService(), remoteMessage != null ? remoteMessage.getPriority() : "n/a", timeSinceLastRefresh));
 
       if (FeatureFlags.useFcmForegroundService() && Build.VERSION.SDK_INT >= 31 && remoteMessage != null && remoteMessage.getPriority() == RemoteMessage.PRIORITY_HIGH && timeSinceLastRefresh > FCM_FOREGROUND_INTERVAL) {
-        FcmFetchManager.enqueue(context, true);
+        enqueueSuccessful = FcmFetchManager.enqueue(context, true);
         SignalStore.misc().setLastFcmForegroundServiceTime(System.currentTimeMillis());
       } else {
-        FcmFetchManager.enqueue(context, false);
+        enqueueSuccessful = FcmFetchManager.enqueue(context, false);
       }
     } catch (Exception e) {
-      Log.w(TAG, "Failed to start service. Falling back to legacy approach.", e);
+      Log.w(TAG, "Failed to start service.", e);
+      enqueueSuccessful = false;
+    }
+
+    if (!enqueueSuccessful) {
+      Log.w(TAG, "Failed to start service. Falling back to legacy approach.");
       FcmFetchManager.retrieveMessages(context);
     }
   }

app/src/main/java/org/thoughtcrime/securesms/jobs/FcmRefreshJob.java

@@ -56,8 +56,8 @@ public class FcmRefreshJob extends BaseJob {
     this(new Job.Parameters.Builder()
                            .setQueue("FcmRefreshJob")
                            .addConstraint(NetworkConstraint.KEY)
-                           .setMaxAttempts(1)
+                           .setMaxAttempts(3)
-                           .setLifespan(TimeUnit.MINUTES.toMillis(5))
+                           .setLifespan(TimeUnit.HOURS.toMillis(6))
                            .setMaxInstancesForFactory(1)
                            .build());
   }
@@ -109,7 +109,7 @@ public class FcmRefreshJob extends BaseJob {
 
   @Override
   public void onFailure() {
-    Log.w(TAG, "GCM reregistration failed after retry attempt exhaustion!");
+    Log.w(TAG, "FCM reregistration failed after retry attempt exhaustion!");
   }
 
   @Override