refactor(dbus): D-Bus interface management with cleanup support.

Introduced a `DbusInterface` base class with a `cleanup` method to
standardize resource cleanup for D-Bus interfaces. Modified
`InterfacePiControl` to inherit from it and implemented `cleanup` logic
for proper watchdog resource handling. Adjusted `BusProvider` to manage
multiple interfaces and ensure cleanup on shutdown.

src/revpi_middleware/dbus_middleware1/bus_provider.py

@@ -34,10 +34,19 @@ class BusProvider(Thread):
     def run(self):
         log.debug("enter BusProvider.run")
 
+        # The 2nd, 3rd, ... arguments can be objects or tuples of a path and an object
+        #   Example(),
+        #   ("Subdir1", Example()),
+        #   ("Subdir2", Example()),
+        #   ("Subdir2/Whatever", Example())
+        lst_interfaces = [
+            InterfacePiControl(self.picontrol_device, self.config_rsc),
+        ]
+
         try:
             self._bus.publish(
                 REVPI_DBUS_NAME,
-                InterfacePiControl(self.picontrol_device, self.config_rsc),
+                *lst_interfaces,
             )
         except Exception as e:
             log.error(f"can not publish dbus {REVPI_DBUS_NAME}: {e}")
@@ -47,6 +56,12 @@ class BusProvider(Thread):
         except Exception as e:
             log.error(f"can not run dbus mainloop: {e}")
 
+        # Clean up all interfaces
+        for interface in lst_interfaces:
+            if type(interface) is tuple:
+                _, interface = interface
+            interface.cleanup()
+
         log.debug("leave BusProvider.run")
 
     def stop(self):

src/revpi_middleware/dbus_middleware1/dbus_helper.py

@@ -11,6 +11,18 @@ REVPI_DBUS_NAME = "com.revolutionpi.middleware1"
 REVPI_DBUS_BASE_PATH = "/com/revolutionpi/middleware1"
 
 
+class DbusInterface:
+
+    def cleanup(self):
+        """
+        Represents a method responsible for performing cleanup operations. This method is executed to properly
+        release resources, close connections, or perform other necessary finalization tasks.
+
+        This method does not take any arguments or return a value.
+        """
+        pass
+
+
 def extend_interface(*args) -> str:
     """
     Extends an interface name by appending additional segments to a pre-defined base name.

src/revpi_middleware/dbus_middleware1/process_image/interface_picontrol.py

@@ -7,11 +7,12 @@ from logging import getLogger
 from pydbus.generic import signal
 
 from .process_image_helper import PiControlIoctl, ResetDriverWatchdog
+from ..dbus_helper import DbusInterface
 
 log = getLogger(__name__)
 
 
-class InterfacePiControl:
+class InterfacePiControl(DbusInterface):
     """
     <node>
         <interface name='com.revolutionpi.middleware1.picontrol'>
@@ -32,6 +33,9 @@ class InterfacePiControl:
         self.wd_reset_driver = ResetDriverWatchdog(self.picontrol_device)
         self.wd_reset_driver.register_call(self.notify_reset_driver)
 
+    def cleanup(self):
+        self.wd_reset_driver.stop()
+
     def notify_reset_driver(self):
         self.NotifyDriverReset()