use primitive fields instead of models for tasks

- modify osusers.tasks and osusers.models to avoid serialization of full
  models for celery tasks and use the required fields only

gnuviechadmin/osusers/models.py

@@ -53,7 +53,7 @@ class Group(TimeStampedModel, models.Model):
 
     def save(self, *args, **kwargs):
         super(Group, self).save(*args, **kwargs)
-        create_ldap_group.delay(self)
+        create_ldap_group.delay(self.groupname, self.gid, self.descr)
         return self
 
     def delete(self, *args, **kwargs):
@@ -94,7 +94,7 @@ class UserManager(models.Manager):
             password = generate_password()
         homedir = os.path.join(settings.OSUSER_HOME_BASEPATH, username)
         group = Group.objects.create(groupname=username, gid=gid)
-        create_ldap_group.delay(group)
+        create_ldap_group.delay(group.groupname, group.gid, group.descr)
         user = self.create(username=username, group=group, uid=uid,
                            homedir=homedir,
                            shell=settings.OSUSER_DEFAULT_SHELL)
@@ -126,10 +126,16 @@ class User(TimeStampedModel, models.Model):
         return '{0} ({1})'.format(self.username, self.uid)
 
     def set_password(self, password):
-        create_ldap_user.delay(self, password)
+        create_ldap_user.delay(
+            self.username, self.uid, self.group.id, self.gecos, self.homedir,
+            self.shell, password
+        )
 
     def save(self, *args, **kwargs):
-        create_ldap_user.delay(self, password=None)
+        create_ldap_user.delay(
+            self.username, self.uid, self.group.id, self.gecos, self.homedir,
+            self.shell, password=None
+        )
         return super(User, self).save(*args, **kwargs)
 
     def delete(self, *args, **kwargs):
@@ -137,7 +143,7 @@ class User(TimeStampedModel, models.Model):
             ag.group for ag in AdditionalGroup.objects.filter(user=self)
         ]:
             remove_ldap_user_from_group.delay(self.username, group.groupname)
-        delete_ldap_user.delay(self)
+        delete_ldap_user.delay(self.username)
         delete_ldap_group_if_empty.delay(self.group.groupname)
         self.group.delete()
         super(User, self).delete(*args, **kwargs)

gnuviechadmin/osusers/tasks.py

@@ -14,13 +14,13 @@ class LdapRouter(object):
 
 
 @shared_task
-def create_ldap_group(group):
-    return group.groupname
+def create_ldap_group(groupname, gid, descr):
+    pass
 
 
 @shared_task
-def create_ldap_user(user, password):
-    return user.username
+def create_ldap_user(username, uid, gid, gecos, homedir, shell, password):
+    pass
 
 
 @shared_task
@@ -34,7 +34,7 @@ def remove_ldap_user_from_group(username, groupname):
 
 
 @shared_task
-def delete_ldap_user(user):
+def delete_ldap_user(username):
     pass