[feature] Added "config_deactivating" signal

openwisp_controller/config/apps.py

@@ -23,6 +23,7 @@
 from .signals import (
     config_backend_changed,
     config_deactivated,
+    config_deactivating,
     config_modified,
     device_group_changed,
     device_name_changed,
@@ -310,6 +311,10 @@ def enable_cache_invalidation(self):
             DeviceChecksumView.invalidate_get_device_cache_on_config_deactivated,
             dispatch_uid='config_deactivated_invalidate_get_device_cache',
         )
+        config_deactivating.connect(
+            DeviceChecksumView.invalidate_get_device_cache_on_config_deactivated,
+            dispatch_uid='config_deactivated_invalidate_get_device_cache',
+        )
         config_modified.connect(
             DeviceChecksumView.invalidate_checksum_cache,
             dispatch_uid='invalidate_checksum_cache',

openwisp_controller/config/base/config.py

@@ -17,6 +17,7 @@
 from ..signals import (
     config_backend_changed,
     config_deactivated,
+    config_deactivating,
     config_modified,
     config_status_changed,
 )
@@ -111,6 +112,7 @@ def __init__(self, *args, **kwargs):
         self._initial_status = self.status
         self._send_config_modified_after_save = False
         self._send_config_deactivated = False
+        self._send_config_deactivating = False
         self._send_config_status_changed = False
 
     def __str__(self):
@@ -493,6 +495,8 @@ def save(self, *args, **kwargs):
         if self._send_config_status_changed:
             self._send_config_status_changed_signal()
             self._send_config_status_changed = False
+        if self._send_config_deactivating and self.is_deactivating():
+            self._send_config_deactivating_signal()
         if self._send_config_deactivated and self.is_deactivated():
             self._send_config_deactivated_signal()
         self._initial_status = self.status
@@ -544,6 +548,16 @@ def _send_config_modified_signal(self, action):
             device=self.device,
         )
 
+    def _send_config_deactivating_signal(self):
+        """
+        Emits ``config_deactivating`` signal.
+        """
+        config_deactivating.send(
+            sender=self.__class__,
+            instance=self,
+            previous_status=self._initial_status,
+        )
+
     def _send_config_deactivated_signal(self):
         """
         Emits ``config_deactivated`` signal.
@@ -604,6 +618,7 @@ def set_status_deactivating(self, save=True):
         clears configuration and templates.
         """
         self.config = {}
+        self._send_config_deactivating = True
         self._set_status('deactivating', save, extra_update_fields=['config'])
         self.templates.clear()
 

openwisp_controller/config/signals.py

@@ -21,6 +21,10 @@
 config_deactivated.__doc__ = """
 Providing arguments: ['instance', 'previous_status']
 """
+config_deactivating = Signal()
+config_deactivating.__doc__ = """
+Providing arguments: ['instance', 'previous_status']
+"""
 device_registered = Signal()
 device_registered.__doc__ = """
 Providing arguments: ['instance', 'is_new']

openwisp_controller/connection/apps.py

@@ -11,7 +11,7 @@
 
 from openwisp_utils.admin_theme.menu import register_menu_subitem
 
-from ..config.signals import config_modified
+from ..config.signals import config_deactivating, config_modified
 from .signals import is_working_changed
 
 _TASK_NAME = 'openwisp_controller.connection.tasks.update_config'
@@ -44,6 +44,9 @@ def ready(self):
         config_modified.connect(
             self.config_modified_receiver, dispatch_uid='connection.update_config'
         )
+        config_deactivating.connect(
+            self.config_modified_receiver, dispatch_uid='connection.update_config'
+        )
 
         post_save.connect(
             Credentials.auto_add_credentials_to_device,