storage: add stubs for restore functionality

circle/storage/models.py

@@ -189,6 +189,16 @@ class Disk(TimeStampedModel):
         local_tasks.remove.apply_async(args=[self, user],
                                        queue='localhost.man')
 
+    def restore(self, user=None, task_uuid=None):
+        """Restore removed disk.
+        """
+        # TODO
+        pass
+
+    def restore_async(self, user=None):
+        local_tasks.restore.apply_async(args=[self, user],
+                                        queue='localhost.man')
+
 
 class DiskActivity(TimeStampedModel):
     activity_code = CharField(verbose_name=_('activity_code'), max_length=100)

circle/storage/tasks/local_tasks.py

@@ -9,3 +9,8 @@ def deploy(disk, user):
 @celery.task
 def remove(disk, user):
     disk.remove(task_uuid=remove.request.id, user=user)
+
+
+@celery.task
+def restore(disk, user):
+    disk.restore(task_uuid=restore.request.id, user=user)