Add source to Resource API object

This change add the source the resource API object

Fixes bug #1243651

Change-Id: I4489d34c83d3af7818d3f94afaa31b493df7549d

ceilometer/api/controllers/v2.py

@@ -897,6 +897,9 @@ class Resource(_Base):
     links = [Link]
     "A list containing a self link and associated meter links"
 
+    source = wtypes.text
+    "The source where the resource come from"
+
     def __init__(self, metadata={}, **kwds):
         metadata = _flatten_metadata(metadata)
         super(Resource, self).__init__(metadata=metadata, **kwds)
@@ -907,6 +910,7 @@ class Resource(_Base):
                    project_id='35b17138-b364-4e6a-a131-8f3099c5be68',
                    user_id='efd87807-12d2-4b38-9c70-5f5c2ac427ff',
                    timestamp=datetime.datetime.utcnow(),
+                   source="openstack",
                    metadata={'name1': 'value1',
                              'name2': 'value2'},
                    links=[Link(href=('http://localhost:8777/v2/resources/'

tests/api/v2/test_list_resources_scenarios.py

@@ -201,6 +201,8 @@ class TestListResources(FunctionalTest,
                                                }])
         ids = [r['resource_id'] for r in data]
         self.assertEqual(['resource-id'], ids)
+        sources = [r['source'] for r in data]
+        self.assertEqual(['test_list_resources'], sources)
 
     def test_with_invalid_resource_id(self):
         sample1 = sample.Sample(