Do not require user or project argument for event query

When we query for events by resource we do not need to
provide a user or project because the resource is only
owned by one entity.

Change-Id: I32b3d8a6ed9f1d9de58565b13c9de12f3658326d
Signed-off-by: Doug Hellmann <doug.hellmann@dreamhost.com>

ceilometer/storage/__init__.py

@@ -96,5 +96,3 @@ class EventFilter(object):
         self.resource = resource
         self.meter = meter
         self.source = source
-        if not (self.user or self.project):
-            raise RuntimeError('Must provide one of "user" or "project".')

ceilometer/storage/impl_mongodb.py

@@ -96,11 +96,6 @@ def make_query_from_filter(event_filter, require_meter=True):
         q['user_id'] = event_filter.user
     elif event_filter.project:
         q['project_id'] = event_filter.project
-    else:
-        # NOTE(dhellmann): The EventFilter class should have detected
-        # this case already, but just in case someone passes something
-        # that isn't actually an EventFilter instance...
-        raise RuntimeError('One of "user" or "project" is required')
 
     if event_filter.meter:
         q['counter_name'] = event_filter.meter

tests/storage/test_impl_mongodb.py

@@ -391,13 +391,3 @@ class SumTest(MongoDBEngineTestBase):
                       for r in results)
         assert counts['resource-id'] == 1
         assert set(counts.keys()) == set(['resource-id'])
-
-
-def test_make_query_without_user_or_project():
-    f = storage.EventFilter(user='set')
-    f.user = None  # to bypass the check in the filter class
-    try:
-        impl_mongodb.make_query_from_filter(f)
-    except RuntimeError as err:
-        assert '"user"' in str(err)
-        assert '"project"' in str(err)