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# Copyright 2011 Justin Santa Barbara
#
# 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 errno
import os
from unittest import mock
import nova.privsep.utils
from nova import test
class SupportDirectIOTestCase(test.NoDBTestCase):
def setUp(self):
super(SupportDirectIOTestCase, self).setUp()
# O_DIRECT is not supported on all Python runtimes, so on platforms
# where it's not supported (e.g. Mac), we can still test the code-path
# by stubbing out the value.
if not hasattr(os, 'O_DIRECT'):
# `mock` seems to have trouble stubbing an attr that doesn't
# originally exist, so falling back to stubbing out the attribute
# directly.
os.O_DIRECT = 16384
self.addCleanup(delattr, os, 'O_DIRECT')
self.einval = OSError()
self.einval.errno = errno.EINVAL
self.enoent = OSError()
self.enoent.errno = errno.ENOENT
self.test_path = os.path.join('.', '.directio.test.123')
self.io_flags = os.O_CREAT | os.O_WRONLY | os.O_DIRECT
open_patcher = mock.patch('os.open')
write_patcher = mock.patch('os.write')
close_patcher = mock.patch('os.close')
unlink_patcher = mock.patch('os.unlink')
random_string_patcher = mock.patch(
'nova.privsep.utils.generate_random_string', return_value='123')
self.addCleanup(open_patcher.stop)
self.addCleanup(write_patcher.stop)
self.addCleanup(close_patcher.stop)
self.addCleanup(unlink_patcher.stop)
self.addCleanup(random_string_patcher.stop)
self.mock_open = open_patcher.start()
self.mock_write = write_patcher.start()
self.mock_close = close_patcher.start()
self.mock_unlink = unlink_patcher.start()
random_string_patcher.start()
def test_supports_direct_io(self):
self.mock_open.return_value = 3
self.assertTrue(nova.privsep.utils.supports_direct_io('.'))
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_called_once_with(3, mock.ANY)
# ensure unlink(filepath) will actually remove the file by deleting
# the remaining link to it in close(fd)
self.mock_close.assert_called_once_with(3)
self.mock_unlink.assert_called_once_with(self.test_path)
def test_supports_direct_io_with_exception_in_write(self):
self.mock_open.return_value = 3
self.mock_write.side_effect = ValueError()
self.assertRaises(ValueError, nova.privsep.utils.supports_direct_io,
'.')
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_called_once_with(3, mock.ANY)
# ensure unlink(filepath) will actually remove the file by deleting
# the remaining link to it in close(fd)
self.mock_close.assert_called_once_with(3)
self.mock_unlink.assert_called_once_with(self.test_path)
def test_supports_direct_io_with_exception_in_open(self):
self.mock_open.side_effect = ValueError()
self.assertRaises(ValueError, nova.privsep.utils.supports_direct_io,
'.')
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_not_called()
self.mock_close.assert_not_called()
self.mock_unlink.assert_called_once_with(self.test_path)
def test_supports_direct_io_with_oserror_in_write(self):
self.mock_open.return_value = 3
self.mock_write.side_effect = self.einval
self.assertFalse(nova.privsep.utils.supports_direct_io('.'))
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_called_once_with(3, mock.ANY)
# ensure unlink(filepath) will actually remove the file by deleting
# the remaining link to it in close(fd)
self.mock_close.assert_called_once_with(3)
self.mock_unlink.assert_called_once_with(self.test_path)
def test_supports_direct_io_with_oserror_in_open_einval(self):
self.mock_open.side_effect = self.einval
self.assertFalse(nova.privsep.utils.supports_direct_io('.'))
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_not_called()
self.mock_close.assert_not_called()
self.mock_unlink.assert_called_once_with(self.test_path)
def test_supports_direct_io_with_oserror_in_open_enoent(self):
self.mock_open.side_effect = self.enoent
self.assertFalse(nova.privsep.utils.supports_direct_io('.'))
self.mock_open.assert_called_once_with(self.test_path, self.io_flags)
self.mock_write.assert_not_called()
self.mock_close.assert_not_called()
self.mock_unlink.assert_called_once_with(self.test_path)
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