def cache(self, fetch_func, filename, size=None, *args, **kwargs):
"""Creates image from template.
Ensures that template and image not already exists.
Ensures that base directory exists.
Synchronizes on template fetching.
:fetch_func: Function that creates the base image
Should accept `target` argument.
:filename: Name of the file in the image directory
:size: Size of created image in bytes (optional)
"""
@utils.synchronized(filename, external=True, lock_path=self.lock_path)
def fetch_func_sync(target, *args, **kwargs):
fetch_func(target=target, *args, **kwargs)
base_dir = os.path.join(CONF.instances_path,
CONF.image_cache_subdirectory_name)
if not os.path.exists(base_dir):
fileutils.ensure_tree(base_dir)
base = os.path.join(base_dir, filename)
imagecache.refresh_timestamp(base)
if not self.check_image_exists() or not os.path.exists(base):
self.create_image(fetch_func_sync, base, size,
*args, **kwargs)
if (size and self.preallocate and self._can_fallocate() and
os.access(self.path, os.W_OK)):
utils.execute('fallocate', '-n', '-l', size, self.path)
def test_cache_image_exists(self):
self.mox.StubOutWithMock(imagecache, 'refresh_timestamp')
self.mox.StubOutWithMock(os.path, 'exists')
if self.OLD_STYLE_INSTANCE_PATH:
os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
os.path.exists(self.PATH).AndReturn(True)
os.path.exists(self.TEMPLATE_PATH).AndReturn(True)
imagecache.refresh_timestamp(self.TEMPLATE_PATH)
self.mox.ReplayAll()
image = self.image_class(self.INSTANCE, self.NAME)
image.cache(None, self.TEMPLATE)
self.mox.VerifyAll()
def test_cache_template_exists(self):
image = self.image_class(self.INSTANCE, self.NAME)
self.mox.StubOutWithMock(os.path, 'exists')
self.mox.StubOutWithMock(image, 'check_image_exists')
self.mox.StubOutWithMock(imagecache, 'refresh_timestamp')
os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
image.check_image_exists().AndReturn(False)
imagecache.refresh_timestamp(self.TEMPLATE_PATH)
fn = self.mox.CreateMockAnything()
fn(target=self.TEMPLATE_PATH)
self.mox.ReplayAll()
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
self.mox.VerifyAll()
def test_cache_base_dir_exists(self):
self.mox.StubOutWithMock(imagecache, 'refresh_timestamp')
self.mox.StubOutWithMock(os.path, 'exists')
if self.OLD_STYLE_INSTANCE_PATH:
os.path.exists(self.OLD_STYLE_INSTANCE_PATH).AndReturn(False)
os.path.exists(self.TEMPLATE_DIR).AndReturn(True)
os.path.exists(self.PATH).AndReturn(False)
imagecache.refresh_timestamp(self.TEMPLATE_PATH)
fn = self.mox.CreateMockAnything()
fn(target=self.TEMPLATE_PATH)
self.mox.StubOutWithMock(imagebackend.fileutils, 'ensure_tree')
self.mox.ReplayAll()
image = self.image_class(self.INSTANCE, self.NAME)
self.mock_create_image(image)
image.cache(fn, self.TEMPLATE)
self.mox.VerifyAll()
