utils: move hash_of_set where it's solely used

Change-Id: I5a842da34c1c2cf96eb24b2d086f5992c4990af1

ceilometer/polling/manager.py

@@ -65,6 +65,10 @@ POLLING_OPTS = [
 ]
 
 
+def hash_of_set(s):
+    return str(hash(frozenset(s)))
+
+
 class EmptyPollstersList(Exception):
     def __init__(self):
         msg = ('No valid pollsters can be loaded with the startup parameter'
@@ -95,7 +99,7 @@ class Resources(object):
 
         if self._resources:
             static_resources_group = self.agent_manager.construct_group_id(
-                utils.hash_of_set(self._resources))
+                hash_of_set(self._resources))
             return [v for v in self._resources if
                     not self.agent_manager.partition_coordinator or
                     self.agent_manager.hashrings[
@@ -334,7 +338,7 @@ class AgentManager(cotyledon.Service):
                       for d in self.discoveries])
         # let each set of statically-defined resources have its own group
         static_resource_groups = set([
-            self.construct_group_id(utils.hash_of_set(p.resources))
+            self.construct_group_id(hash_of_set(p.resources))
             for p in self.polling_manager.sources
             if p.resources
         ])

ceilometer/tests/unit/polling/test_manager.py

@@ -78,6 +78,14 @@ class TestManager(base.BaseTestCase):
         super(TestManager, self).setUp()
         self.conf = service.prepare_service([], [])
 
+    def test_hash_of_set(self):
+        x = ['a', 'b']
+        y = ['a', 'b', 'a']
+        z = ['a', 'c']
+        self.assertEqual(manager.hash_of_set(x), manager.hash_of_set(y))
+        self.assertNotEqual(manager.hash_of_set(x), manager.hash_of_set(z))
+        self.assertNotEqual(manager.hash_of_set(y), manager.hash_of_set(z))
+
     def test_load_plugins(self):
         mgr = manager.AgentManager(0, self.conf)
         self.assertIsNotNone(list(mgr.extensions))

ceilometer/tests/unit/test_utils.py

@@ -1,31 +0,0 @@
-#
-# Copyright 2012 New Dream Network, LLC (DreamHost)
-# Copyright (c) 2013 OpenStack Foundation
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-"""Tests for ceilometer/utils.py
-"""
-from oslotest import base
-
-from ceilometer import utils
-
-
-class TestUtils(base.BaseTestCase):
-
-    def test_hash_of_set(self):
-        x = ['a', 'b']
-        y = ['a', 'b', 'a']
-        z = ['a', 'c']
-        self.assertEqual(utils.hash_of_set(x), utils.hash_of_set(y))
-        self.assertNotEqual(utils.hash_of_set(x), utils.hash_of_set(z))
-        self.assertNotEqual(utils.hash_of_set(y), utils.hash_of_set(z))

ceilometer/utils.py

@@ -50,10 +50,6 @@ def execute(*cmd, **kwargs):
     return processutils.execute(*cmd, **kwargs)
 
 
-def hash_of_set(s):
-    return str(hash(frozenset(s)))
-
-
 def spawn_thread(target, *args, **kwargs):
     t = threading.Thread(target=target, args=args, kwargs=kwargs)
     t.daemon = True