Implemented missing chef.purge_user() and connected it to a signal.

Author: mboersma

api/models.py

@@ -15,6 +15,7 @@
 from django.conf import settings
 from django.contrib.auth.models import User
 from django.db import models
+from django.db.models.signals import post_delete
 from django.db.models.signals import post_save
 from django.dispatch import receiver
 from django.dispatch.dispatcher import Signal
@@ -818,10 +819,15 @@ def _user_publish(self):
     CM.publish_user(self.flat(), self.calculate())
 
 
+def _user_purge(self):
+    CM.purge_user(self.flat())
+
+
 # attach to built-in django user
 User.flat = _user_flat
 User.calculate = _user_calculate
 User.publish = _user_publish
+User.purge = _user_purge
 
 # define update/delete callbacks for synchronizing
 # models with the configuration management backend
@@ -836,8 +842,14 @@ def _publish_user_to_cm(**kwargs):
         return
     kwargs['instance'].publish()
 
+
+def _purge_user_from_cm(**kwargs):
+    kwargs['instance'].purge()
+
+
 # use django signals to synchronize database updates with
 # the configuration management backend
 post_save.connect(_publish_to_cm, sender=App, dispatch_uid='api.models')
 post_save.connect(_publish_to_cm, sender=Formation, dispatch_uid='api.models')
 post_save.connect(_publish_user_to_cm, sender=User, dispatch_uid='api.models')
+post_delete.connect(_purge_user_from_cm, sender=User, dispatch_uid='api.models')

cm/chef.py

@@ -236,6 +236,17 @@ def publish_user(user, data):
     _publish('deis-users', user['username'], data)
 
 
+def purge_user(user):
+    """
+    Purge a user from configuration management.
+
+    :param app: a dict containing the username of the user
+    :returns: a tuple of (body, status) from the underlying HTTP response
+    :raises: RuntimeError
+    """
+    _purge('deis-users', user['username'])
+
+
 def publish_app(app, data):
     """
     Publish an app to configuration management.