Adding in cancel notifications

endpoints/notificationevent.py

@@ -358,3 +358,38 @@ class BuildFailureEvent(BaseBuildEvent):
   def get_summary(self, event_data, notification_data):
     return 'Build failure ' + _build_summary(event_data)
 
+
+class BuildCancelledEvent(BaseBuildEvent):
+  @classmethod
+  def event_name(cls):
+    return 'build_cancelled'
+
+  def get_level(self, event_data, notification_data):
+    return 'info'
+
+  def get_sample_data(self, notification):
+    build_uuid = 'fake-build-id'
+
+    # TODO(jzelinskie): remove when more endpoints have been converted to using
+    # interfaces
+    repo = AttrDict({
+      'namespace_name': notification.repository.namespace_user.username,
+      'name': notification.repository.name,
+    })
+    return build_event_data(repo, {
+      'build_id': build_uuid,
+      'build_name': 'some-fake-build',
+      'docker_tags': ['latest', 'foo', 'bar'],
+      'trigger_id': '1245634',
+      'trigger_kind': 'GitHub',
+      'trigger_metadata': {
+        "default_branch": "master",
+        "ref": "refs/heads/somebranch",
+        "commit": "42d4a62c53350993ea41069e9f2cfdefb0df097d"
+      },
+      'image_id': '1245657346'
+    }, subpage='/build/%s' % build_uuid)
+
+  def get_summary(self, event_data, notification_data):
+    return 'Build cancelled ' + _build_summary(event_data)
+