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import mock
from django.conf import settings
from hashlib import md5
from imagekit.cachefiles import ImageCacheFile, LazyImageCacheFile
from imagekit.cachefiles.backends import Simple
from imagekit.lib import force_bytes
from nose.tools import raises, eq_
from .imagegenerators import TestSpec
from .utils import (assert_file_is_truthy, assert_file_is_falsy,
DummyAsyncCacheFileBackend, get_unique_image_file,
get_image_file)
def test_no_source_falsiness():
"""
Ensure cache files generated from sourceless specs are falsy.
"""
spec = TestSpec(source=None)
file = ImageCacheFile(spec)
assert_file_is_falsy(file)
def test_sync_backend_truthiness():
"""
Ensure that a cachefile with a synchronous cache file backend (the default)
is truthy.
"""
spec = TestSpec(source=get_unique_image_file())
file = ImageCacheFile(spec)
assert_file_is_truthy(file)
def test_async_backend_falsiness():
"""
Ensure that a cachefile with an asynchronous cache file backend is falsy.
"""
spec = TestSpec(source=get_unique_image_file())
file = ImageCacheFile(spec, cachefile_backend=DummyAsyncCacheFileBackend())
assert_file_is_falsy(file)
@raises(TestSpec.MissingSource)
def test_no_source_error():
spec = TestSpec(source=None)
file = ImageCacheFile(spec)
file.generate()
def test_repr_does_not_send_existence_required():
"""
Ensure that `__repr__` method does not send `existance_required` signal
Cachefile strategy may be configured to generate file on
`existance_required`.
To generate images, backend passes `ImageCacheFile` instance to worker.
Both celery and RQ calls `__repr__` method for each argument to enque call.
And if `__repr__` of object will send this signal, we will get endless
recursion
"""
with mock.patch('imagekit.cachefiles.existence_required') as signal:
# import here to apply mock
from imagekit.cachefiles import ImageCacheFile
spec = TestSpec(source=get_unique_image_file())
file = ImageCacheFile(
spec,
cachefile_backend=DummyAsyncCacheFileBackend()
)
file.__repr__()
eq_(signal.send.called, False)
def test_memcached_cache_key():
"""
Ensure the default cachefile backend is sanitizing its cache key for
memcached by default.
"""
class MockFile(object):
def __init__(self, name):
self.name = name
backend = Simple()
extra_char_count = len('state-') + len(settings.IMAGEKIT_CACHE_PREFIX)
length = 199 - extra_char_count
filename = '1' * length
file = MockFile(filename)
eq_(backend.get_key(file), '%s%s-state' %
(settings.IMAGEKIT_CACHE_PREFIX, file.name))
length = 200 - extra_char_count
filename = '1' * length
file = MockFile(filename)
eq_(backend.get_key(file), '%s%s:%s' % (
settings.IMAGEKIT_CACHE_PREFIX,
'1' * (200 - len(':') - 32 - len(settings.IMAGEKIT_CACHE_PREFIX)),
md5(force_bytes('%s%s-state' % (settings.IMAGEKIT_CACHE_PREFIX, filename))).hexdigest()))
def test_lazyfile_stringification():
file = LazyImageCacheFile('testspec', source=None)
eq_(str(file), '')
eq_(repr(file), '<ImageCacheFile: None>')
source_file = get_image_file()
file = LazyImageCacheFile('testspec', source=source_file)
file.name = 'a.jpg'
eq_(str(file), 'a.jpg')
eq_(repr(file), '<ImageCacheFile: a.jpg>')
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