Fix output of datetime objects in API

We accidentally changed formats in the v2 API in a previous
commit.

This forces all text representations of datetime objects to be
'%Y-%m-%dT%H:%M:%S.%f'

Change-Id: I2a4b55804d7ed2084d8705844ca63e41ed626bf2
Closes-Bug: #1579844

designate/objects/adapters/base.py

@@ -11,11 +11,13 @@
 #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 #    License for the specific language governing permissions and limitations
 #    under the License.
+import datetime
 
 from oslo_log import log
 import six
 
 from designate import objects
+from designate import utils
 from designate import exceptions
 from designate.i18n import _LE
 from designate.i18n import _LI
@@ -91,6 +93,18 @@ class DesignateAdapter(object):
 
     @classmethod
     def _render_object(cls, object, *args, **kwargs):
+
+        # We need to findout the type of field sometimes - these are helper
+        # methods for that.
+
+        def _is_datetime_field(object, key):
+            field = object.FIELDS.get(key, {})
+            return field.get('schema', {}).get('format', '') == 'date-time'
+
+        def _format_datetime_field(obj):
+            return datetime.datetime.strftime(
+                    obj, utils.DATETIME_FORMAT)
+
         # The dict we will return to be rendered to JSON / output format
         r_obj = {}
         # Loop over all fields that are supposed to be output
@@ -116,6 +130,10 @@ class DesignateAdapter(object):
                     cls.ADAPTER_FORMAT,
                     object.FIELDS[obj_key].get('relation_cls')).render(
                         cls.ADAPTER_FORMAT, obj, *args, **kwargs)
+            elif _is_datetime_field(object, obj_key) and obj is not None:
+                # So, we now have a datetime object to render correctly
+                # see bug #1579844
+                r_obj[key] = _format_datetime_field(obj)
             else:
                 # Just attach the damn item if there is no weird edge cases
                 r_obj[key] = obj

designate/tests/unit/test_objects/test_adapters.py

@@ -13,10 +13,12 @@
 # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 # License for the specific language governing permissions and limitations
 # under the License.
+import datetime
 
 from mock import Mock
 from oslo_log import log as logging
 import oslotest.base
+from oslo_utils import timeutils
 
 from designate import objects
 from designate.objects import adapters
@@ -35,6 +37,25 @@ class DesignateTestAdapter(adapters.DesignateAdapter):
     }
 
 
+class DesignateTestPersistantObject(
+        objects.DesignateObject, objects.base.PersistentObjectMixin):
+    pass
+
+
+class DesignateDateTimeAdaptor(adapters.DesignateAdapter):
+    ADAPTER_OBJECT = DesignateTestPersistantObject
+    ADAPTER_FORMAT = 'TEST_API'
+
+    MODIFICATIONS = {
+        'fields': {
+            "id": {},
+            "created_at": {},
+            "updated_at": {},
+        },
+        'options': {}
+    }
+
+
 class DesignateAdapterTest(oslotest.base.BaseTestCase):
     def test_get_object_adapter(self):
         adapters.DesignateAdapter.get_object_adapter(
@@ -43,6 +64,16 @@ class DesignateAdapterTest(oslotest.base.BaseTestCase):
     def test_object_render(self):
         adapters.DesignateAdapter.render('TEST_API', objects.DesignateObject())
 
+    def test_datetime_format(self):
+        test_obj = DesignateTestPersistantObject()
+        test_obj.created_at = timeutils.utcnow()
+
+        test_dict = adapters.DesignateAdapter.render('TEST_API', test_obj)
+
+        datetime.datetime.strptime(
+            test_dict['created_at'],
+            '%Y-%m-%dT%H:%M:%S.%f')
+
 
 class RecordSetAPIv2AdapterTest(oslotest.base.BaseTestCase):
     def test_get_path(self):

designate/utils.py

@@ -68,6 +68,11 @@ DEFAULT_AGENT_PORT = 5358
 DEFAULT_MDNS_PORT = 5354
 
 
+# Default datetime format
+
+DATETIME_FORMAT = '%Y-%m-%dT%H:%M:%S.%f'
+
+
 def find_config(config_path):
     """
     Find a configuration file using the given hint.