Added checksum method to AbstractConfig

django_netjsonconfig/models/device.py

@@ -1,4 +1,5 @@
 import json
+import hashlib
 import collections
 
 from django.db import models
@@ -80,6 +81,11 @@ def get_backend_instance(self, config=None, template_instances=None):
             kwargs['templates'] = [t.config for t in template_instances]
         return backend(**kwargs)
 
+    @property
+    def checksum(self):
+        """ returns checksum of configuration """
+        return hashlib.md5(self.json().encode()).hexdigest()
+
     def json(self, dict=False, **kwargs):
         config = self.backend_instance.config
         if dict:

django_netjsonconfig/tests/test_device.py

@@ -27,7 +27,7 @@ def test_backend_class(self):
         self.assertIs(d.backend_class, OpenWrt)
 
     def test_backend_instance(self):
-        config = {'general':{'hostname':'device'}}
+        config = {'general': {'hostname': 'device'}}
         d = Device(name='test', backend='netjsonconfig.OpenWrt', config=config)
         self.assertIsInstance(d.backend_instance, OpenWrt)
 
@@ -46,7 +46,7 @@ def test_json(self):
         radio = Template.objects.get(name='radio0')
         d = Device(name='test',
                    backend='netjsonconfig.OpenWrt',
-                   config={'general':{'hostname':'json-test'}},
+                   config={'general': {'hostname': 'json-test'}},
                    key=self.TEST_KEY)
         d.full_clean()
         d.save()
@@ -55,7 +55,7 @@ def test_json(self):
         full_config = {
             'type': 'DeviceConfiguration',
             'general': {
-                'hostname':'json-test'
+                'hostname': 'json-test'
             },
             "interfaces": [
                 {
@@ -128,7 +128,7 @@ def test_m2m_validation(self):
     def test_key_validation(self):
         d = Device(name='test',
                    backend='netjsonconfig.OpenWrt',
-                   config={'general':{'hostname':'json-test'}})
+                   config={'general': {'hostname': 'json-test'}})
         d.key = 'key/key'
         with self.assertRaises(ValidationError):
             d.full_clean()
@@ -140,3 +140,12 @@ def test_key_validation(self):
             d.full_clean()
         d.key = self.TEST_KEY
         d.full_clean()
+
+    def test_checksum(self):
+        d = Device(name='test',
+                   backend='netjsonconfig.OpenWrt',
+                   config={'general': {'hostname': 'json-test'}},
+                   key=self.TEST_KEY)
+        d.full_clean()
+        d.save()
+        self.assertEqual(len(d.checksum), 32)