OpenStack Networking (Neutron)
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# Copyright 2016 Red Hat, Inc.
#
# 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.
import os
import testtools
from neutron.common import utils
from neutron.tests.common.exclusive_resources import resource_allocator
from neutron.tests.functional import base
def safe_remove_file(file_path):
try:
os.remove(file_path)
except OSError:
pass
class TestResourceAllocator(base.BaseLoggingTestCase):
def setUp(self):
super(TestResourceAllocator, self).setUp()
self.ra = resource_allocator.ResourceAllocator(
utils.get_random_string(6), lambda: 42)
self.addCleanup(safe_remove_file, self.ra._state_file_path)
def test_allocate_and_release(self):
# Assert that we can allocate a resource
resource = self.ra.allocate()
self.assertEqual('42', resource)
# Assert that we cannot allocate any more resources, since we're
# using an allocator that always returns the same value
with testtools.ExpectedException(ValueError):
self.ra.allocate()
# Assert that releasing the resource and allocating again works
self.ra.release(resource)
resource = self.ra.allocate()
self.assertEqual('42', resource)
def test_file_manipulation(self):
# The file should not be created until the first allocation
self.assertFalse(os.path.exists(self.ra._state_file_path))
resource = self.ra.allocate()
self.assertTrue(os.path.exists(self.ra._state_file_path))
# Releasing the last resource should delete the file
self.ra.release(resource)
self.assertFalse(os.path.exists(self.ra._state_file_path))