Move calls to obtain installers from the service onto AsyncCall.

lutris/services/base.py

@@ -186,6 +186,22 @@ class BaseService(GObject.Object):
         """Used to generate an installer from the data returned from the services"""
         return {}
 
+    def install_from_api(self, db_game, appid=None):
+        """Install a game, using the API or generate_installer() to obtain the installer."""
+        if not appid:
+            appid = db_game["appid"]
+
+        def on_installers_ready(service_installers, error):
+            if error:
+                raise error  # bounce any error off the backstop
+
+            if not service_installers:
+                service_installers = [self.generate_installer(db_game)]
+            application = Gio.Application.get_default()
+            application.show_installer_window(service_installers, service=self, appid=appid)
+
+        AsyncCall(self.get_installers_from_api, on_installers_ready, appid)
+
     def get_installer_files(self, installer, installer_file_id, selected_extras):
         """Used to obtains the content files from the service, when an 'N/A' file is left in
         the installer. This handles 'extras', and must return a tuple; first a list of

lutris/services/flathub.py

@@ -6,7 +6,6 @@ from gettext import gettext as _
 from pathlib import Path
 
 import requests
-from gi.repository import Gio
 
 from lutris import settings
 from lutris.exceptions import MissingExecutableError
@@ -108,14 +107,10 @@ class FlathubService(BaseService):
         logger.debug("Installing %s from service %s", app_id, self.id)
         # Check if Flathub repo is active on the system
         if not self.is_flathub_remote_active():
-            logger.error("Flathub is not configured on the system. Visit https://flatpak.org/setup/ for instructions.")
-            return
+            raise RuntimeError(
+                _("Flathub is not configured on the system. Visit https://flatpak.org/setup/ for instructions."))
         # Install the game
-        service_installers = self.get_installers_from_api(app_id)
-        if not service_installers:
-            service_installers = [self.generate_installer(db_game)]
-        application = Gio.Application.get_default()
-        application.show_installer_window(service_installers, service=self, appid=app_id)
+        self.install_from_api(db_game, app_id)
 
     def get_installed_apps(self):
         """Get list of installed Flathub apps"""

lutris/services/steam.py

@@ -4,8 +4,6 @@ import os
 from collections import defaultdict
 from gettext import gettext as _
 
-from gi.repository import Gio
-
 from lutris import settings
 from lutris.config import LutrisConfig, write_game_config
 from lutris.database import sql
@@ -242,8 +240,4 @@ class SteamService(BaseService):
             game = Game(existing_game.id)
             game.save()
             return
-        service_installers = self.get_installers_from_api(appid)
-        if not service_installers:
-            service_installers = [self.generate_installer(db_game)]
-        application = Gio.Application.get_default()
-        application.show_installer_window(service_installers, service=self, appid=appid)
+        self.install_from_api(db_game, appid)