feat(revpiconfig): Make unit config changes asynchronous

Refactored unit enable/disable actions to run in separate threads,
ensuring non-blocking operations. This enhances performance and avoids
potential delays during systemd operations.

src/revpi_middleware/dbus_middleware1/system_config/revpi_config.py

@@ -10,6 +10,7 @@ from glob import glob
 from logging import getLogger
 from os import X_OK, access
 from os.path import exists, join
+from threading import Thread
 from typing import List, Optional
 
 from pydbus import SystemBus
@@ -665,13 +666,39 @@ def simple_systemd(action: ConfigActions, unit: str):
     systemd_manager = systemd["org.freedesktop.systemd1.Manager"]
 
     if action is ConfigActions.ENABLE:
-        systemd_manager.UnmaskUnitFiles([unit], False)
+
-        systemd_manager.EnableUnitFiles([unit], False, False)
+        def thread_unit_config():
+            """Change configuration asynchronously."""
+            # Dbus call: UnmaskUnitFiles(in as files, in b runtime, out a(sss) changes
+            lst_change_unmask = systemd_manager.UnmaskUnitFiles([unit], False)
+
+            # Dbus call: EnableUnitFiles(in as files, in b runtime, in b force,
+            #                            out b carries_install_info, out a(sss) changes
+            lst_change_enable = systemd_manager.EnableUnitFiles([unit], False, False)
+            if lst_change_unmask or lst_change_enable:
+                # Reload systemd after modified unit property
+                systemd_manager.Reload()
+
+        Thread(target=thread_unit_config, daemon=True).start()
+
+        # Dbus call: StartUnit(in s name, in s mode, out o job
         systemd_manager.StartUnit(unit, "replace")
 
     elif action is ConfigActions.DISABLE:
+
+        def thread_unit_config():
+            """Change configuration asynchronously."""
+            # Dbus call: DisableUnitFiles (in as files, in b runtime, out a(sss) changes)
+            change = systemd_manager.DisableUnitFiles([unit], False)
+            if change:
+                # Reload systemd after modified unit property
+                systemd_manager.Reload()
+
+        Thread(target=thread_unit_config, daemon=True).start()
+
+        # Dbus call: StopUnit(in s name,in s mode, out o job
         systemd_manager.StopUnit(unit, "replace")
-        systemd_manager.DisableUnitFiles([unit], False)
+
 
     elif action is ConfigActions.STATUS:
         try:
@@ -696,6 +723,8 @@ def simple_systemd(action: ConfigActions, unit: str):
     else:
         raise ValueError(f"action {action} not supported")
 
+    return None
+
 
 if __name__ == "__main__":
     rc = RevPiConfig()