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# Copyright (c) 2010-2023 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 swift.common.utils.libc"""
import ctypes
import os
import platform
import tempfile
import unittest
from unittest import mock
from swift.common.utils import libc
from test.debug_logger import debug_logger
class Test_LibcWrapper(unittest.TestCase):
def test_available_function(self):
# This should pretty much always exist
getpid_wrapper = libc._LibcWrapper('getpid')
self.assertTrue(getpid_wrapper.available)
self.assertEqual(getpid_wrapper(), os.getpid())
def test_unavailable_function(self):
# This won't exist
no_func_wrapper = libc._LibcWrapper('diffractively_protectorship')
self.assertFalse(no_func_wrapper.available)
self.assertRaises(NotImplementedError, no_func_wrapper)
def test_argument_plumbing(self):
lseek_wrapper = libc._LibcWrapper('lseek')
with tempfile.TemporaryFile() as tf:
tf.write(b"abcdefgh")
tf.flush()
lseek_wrapper(tf.fileno(),
ctypes.c_uint64(3),
# 0 is SEEK_SET
0)
self.assertEqual(tf.read(100), b"defgh")
class TestModifyPriority(unittest.TestCase):
def test_modify_priority(self):
pid = os.getpid()
logger = debug_logger()
called = {}
def _fake_setpriority(*args):
called['setpriority'] = args
def _fake_syscall(*args):
called['syscall'] = args
# Test if current architecture supports changing of priority
try:
libc.NR_ioprio_set()
except OSError as e:
raise unittest.SkipTest(e)
with mock.patch('swift.common.utils.libc._libc_setpriority',
_fake_setpriority), \
mock.patch('swift.common.utils.libc._posix_syscall',
_fake_syscall):
called = {}
# not set / default
libc.modify_priority({}, logger)
self.assertEqual(called, {})
called = {}
# just nice
libc.modify_priority({'nice_priority': '1'}, logger)
self.assertEqual(called, {'setpriority': (0, pid, 1)})
called = {}
# just ionice class uses default priority 0
libc.modify_priority({'ionice_class': 'IOPRIO_CLASS_RT'}, logger)
architecture = os.uname()[4]
arch_bits = platform.architecture()[0]
if architecture == 'x86_64' and arch_bits == '64bit':
self.assertEqual(called, {'syscall': (251, 1, pid, 1 << 13)})
elif architecture == 'aarch64' and arch_bits == '64bit':
self.assertEqual(called, {'syscall': (30, 1, pid, 1 << 13)})
else:
self.fail("Unexpected call: %r" % called)
called = {}
# just ionice priority is ignored
libc.modify_priority({'ionice_priority': '4'}, logger)
self.assertEqual(called, {})
called = {}
# bad ionice class
libc.modify_priority({'ionice_class': 'class_foo'}, logger)
self.assertEqual(called, {})
called = {}
# ionice class & priority
libc.modify_priority({
'ionice_class': 'IOPRIO_CLASS_BE',
'ionice_priority': '4',
}, logger)
if architecture == 'x86_64' and arch_bits == '64bit':
self.assertEqual(called, {
'syscall': (251, 1, pid, 2 << 13 | 4)
})
elif architecture == 'aarch64' and arch_bits == '64bit':
self.assertEqual(called, {
'syscall': (30, 1, pid, 2 << 13 | 4)
})
else:
self.fail("Unexpected call: %r" % called)
called = {}
# all
libc.modify_priority({
'nice_priority': '-15',
'ionice_class': 'IOPRIO_CLASS_IDLE',
'ionice_priority': '6',
}, logger)
if architecture == 'x86_64' and arch_bits == '64bit':
self.assertEqual(called, {
'setpriority': (0, pid, -15),
'syscall': (251, 1, pid, 3 << 13 | 6),
})
elif architecture == 'aarch64' and arch_bits == '64bit':
self.assertEqual(called, {
'setpriority': (0, pid, -15),
'syscall': (30, 1, pid, 3 << 13 | 6),
})
else:
self.fail("Unexpected call: %r" % called)
def test__NR_ioprio_set(self):
with mock.patch('os.uname', return_value=('', '', '', '', 'x86_64')), \
mock.patch('platform.architecture',
return_value=('64bit', '')):
self.assertEqual(251, libc.NR_ioprio_set())
with mock.patch('os.uname', return_value=('', '', '', '', 'x86_64')), \
mock.patch('platform.architecture',
return_value=('32bit', '')):
self.assertRaises(OSError, libc.NR_ioprio_set)
with mock.patch('os.uname',
return_value=('', '', '', '', 'aarch64')), \
mock.patch('platform.architecture',
return_value=('64bit', '')):
self.assertEqual(30, libc.NR_ioprio_set())
with mock.patch('os.uname',
return_value=('', '', '', '', 'aarch64')), \
mock.patch('platform.architecture',
return_value=('32bit', '')):
self.assertRaises(OSError, libc.NR_ioprio_set)
with mock.patch('os.uname', return_value=('', '', '', '', 'alpha')), \
mock.patch('platform.architecture',
return_value=('64bit', '')):
self.assertRaises(OSError, libc.NR_ioprio_set)
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