def test_both_clean_up(self, mock_stat, mock_image_service, mock_statvfs,
cache_cleanup_list_mock):
# Not enough space, clean up of both caches required
mock_stat.return_value.st_dev = 1
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.side_effect = [
mock.Mock(f_frsize=1, f_bavail=1),
mock.Mock(f_frsize=1, f_bavail=2),
mock.Mock(f_frsize=1, f_bavail=1024)
]
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_with('master_dir')
self.assertEqual(3, mock_statvfs.call_count)
self.mock_first_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 1))
self.mock_second_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 2))
mock_stat_calls_expected = [mock.call('master_dir'),
mock.call('first_cache_dir'),
mock.call('second_cache_dir')]
mock_statvfs_calls_expected = [mock.call('master_dir'),
mock.call('master_dir'),
mock.call('master_dir')]
self.assertEqual(mock_stat_calls_expected, mock_stat.mock_calls)
self.assertEqual(mock_statvfs_calls_expected, mock_statvfs.mock_calls)
def test_one_clean_up(self, mock_stat, mock_image_service, mock_statvfs,
cache_cleanup_list_mock):
# Not enough space, first cache clean up is enough
mock_stat.return_value.st_dev = 1
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.side_effect = [
mock.Mock(f_frsize=1, f_bavail=1),
mock.Mock(f_frsize=1, f_bavail=1024)
]
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_with('master_dir')
self.assertEqual(2, mock_statvfs.call_count)
self.mock_first_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 1))
self.assertFalse(self.mock_second_cache.return_value.clean_up.called)
# Since we are using generator expression in clean_up_caches, stat on
# second cache wouldn't be called if we got enough free space on
# cleaning up the first cache.
mock_stat_calls_expected = [mock.call('master_dir'),
mock.call('first_cache_dir')]
mock_statvfs_calls_expected = [mock.call('master_dir'),
mock.call('master_dir')]
self.assertEqual(mock_stat_calls_expected, mock_stat.mock_calls)
self.assertEqual(mock_statvfs_calls_expected, mock_statvfs.mock_calls)
def test_clean_up_another_fs(self, mock_stat, mock_image_service,
mock_statvfs, cache_cleanup_list_mock):
# Not enough space, need to cleanup second cache
mock_stat.side_effect = [mock.Mock(st_dev=1),
mock.Mock(st_dev=2),
mock.Mock(st_dev=1)]
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.side_effect = [
mock.Mock(f_frsize=1, f_bavail=1),
mock.Mock(f_frsize=1, f_bavail=1024)
]
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_with('master_dir')
self.assertEqual(2, mock_statvfs.call_count)
self.mock_second_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 1))
self.assertFalse(self.mock_first_cache.return_value.clean_up.called)
# Since first cache exists on a different partition, it wouldn't be
# considered for cleanup.
mock_stat_calls_expected = [mock.call('master_dir'),
mock.call('first_cache_dir'),
mock.call('second_cache_dir')]
mock_statvfs_calls_expected = [mock.call('master_dir'),
mock.call('master_dir')]
self.assertEqual(mock_stat_calls_expected, mock_stat.mock_calls)
self.assertEqual(mock_statvfs_calls_expected, mock_statvfs.mock_calls)
def test_no_clean_up(self, mock_image_service, mock_statvfs,
cache_cleanup_list_mock):
# Enough space found - no clean up
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.return_value = mock.Mock(f_frsize=1, f_bavail=1024)
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_once_with('master_dir')
self.assertFalse(self.mock_first_cache.return_value.clean_up.called)
self.assertFalse(self.mock_second_cache.return_value.clean_up.called)
mock_statvfs.assert_called_once_with('master_dir')
def fetch_images(ctx, cache, images_info):
"""Check for available disk space and fetch images using ImageCache.
:param ctx: context
:param cache: ImageCache instance to use for fetching
:param images_info: list of tuples (image uuid, destination path)
:raises: InstanceDeployFailure if unable to find enough disk space
"""
try:
image_cache.clean_up_caches(ctx, cache.master_dir, images_info)
except exception.InsufficientDiskSpace as e:
raise exception.InstanceDeployFailure(reason=e)
# NOTE(dtantsur): This code can suffer from race condition,
# if disk space is used between the check and actual download.
# This is probably unavoidable, as we can't control other
# (probably unrelated) processes
for uuid, path in images_info:
cache.fetch_image(uuid, path, ctx=ctx)
def fetch_images(ctx, cache, images_info, force_raw=True):
"""Check for available disk space and fetch images using ImageCache.
:param ctx: context
:param cache: ImageCache instance to use for fetching
:param images_info: list of tuples (image href, destination path)
:param force_raw: boolean value, whether to convert the image to raw
format
:raises: InstanceDeployFailure if unable to find enough disk space
"""
try:
image_cache.clean_up_caches(ctx, cache.master_dir, images_info)
except exception.InsufficientDiskSpace as e:
raise exception.InstanceDeployFailure(reason=e)
# NOTE(dtantsur): This code can suffer from race condition,
# if disk space is used between the check and actual download.
# This is probably unavoidable, as we can't control other
# (probably unrelated) processes
for href, path in images_info:
cache.fetch_image(href, path, ctx=ctx, force_raw=force_raw)
def test_clean_up_another_fs(self, mock_stat, mock_image_service,
mock_statvfs, cache_cleanup_list_mock):
# Not enough space, need to cleanup second cache
mock_stat.side_effect = [
mock.Mock(st_dev=1),
mock.Mock(st_dev=2),
mock.Mock(st_dev=1)
]
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.side_effect = [
mock.Mock(f_frsize=1, f_bavail=1),
mock.Mock(f_frsize=1, f_bavail=1024)
]
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_with('master_dir')
self.assertEqual(2, mock_statvfs.call_count)
self.mock_second_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 1))
self.assertFalse(self.mock_first_cache.return_value.clean_up.called)
# Since first cache exists on a different partition, it wouldn't be
# considered for cleanup.
mock_stat_calls_expected = [
mock.call('master_dir'),
mock.call('first_cache_dir'),
mock.call('second_cache_dir')
]
mock_statvfs_calls_expected = [
mock.call('master_dir'),
mock.call('master_dir')
]
self.assertEqual(mock_stat_calls_expected, mock_stat.mock_calls)
self.assertEqual(mock_statvfs_calls_expected, mock_statvfs.mock_calls)
def test_one_clean_up(self, mock_stat, mock_image_service, mock_statvfs,
cache_cleanup_list_mock):
# Not enough space, first cache clean up is enough
mock_stat.return_value.st_dev = 1
mock_show = mock_image_service.return_value.show
mock_show.return_value = dict(size=42)
mock_statvfs.side_effect = [
mock.MagicMock(f_frsize=1,
f_bavail=1,
spec_set=['f_frsize', 'f_bavail']),
mock.MagicMock(f_frsize=1,
f_bavail=1024,
spec_set=['f_frsize', 'f_bavail'])
]
cache_cleanup_list_mock.__iter__.return_value = self.cache_cleanup_list
image_cache.clean_up_caches(None, 'master_dir', [('uuid', 'path')])
mock_show.assert_called_once_with('uuid')
mock_statvfs.assert_called_with('master_dir')
self.assertEqual(2, mock_statvfs.call_count)
self.mock_first_cache.return_value.clean_up.assert_called_once_with(
amount=(42 - 1))
self.assertFalse(self.mock_second_cache.return_value.clean_up.called)
# Since we are using generator expression in clean_up_caches, stat on
# second cache wouldn't be called if we got enough free space on
# cleaning up the first cache.
mock_stat_calls_expected = [
mock.call('master_dir'),
mock.call('first_cache_dir')
]
mock_statvfs_calls_expected = [
mock.call('master_dir'),
mock.call('master_dir')
]
self.assertEqual(mock_stat_calls_expected, mock_stat.mock_calls)
self.assertEqual(mock_statvfs_calls_expected, mock_statvfs.mock_calls)