def test_file(self):
# Tag should accept an :class:`ImageFieldFile` as its argument.
storage_path = self.create_image('100x100.png')
adjusted = AdjustedImage()
adjusted.adjusted = storage_path
helper = AdjustmentHelper([storage_path], generate=False)
helper.adjust('fit', width=50, height=50)
t = Template("{% load daguerre %}{% adjust image 'fit' width=50 "
"height=50 as adj %}{{ adj }}")
c = Context({'image': adjusted.adjusted})
self.assertEqual(t.render(c), escape(helper[0][1]['url']))
def _generate(self, storage_path):
# May raise IOError if the file doesn't exist or isn't a valid image.
# If we're here, we can assume that the adjustment doesn't already
# exist. Try to create one from the storage path. Raises IOError if
# something goes wrong.
kwargs = {
'requested': self.requested,
'storage_path': storage_path
}
with default_storage.open(storage_path, 'rb') as im_file:
im = Image.open(im_file)
try:
im.verify()
except (IndexError, struct.error, SyntaxError):
# Raise an IOError if the image isn't valid.
raise IOError
im_file.seek(0)
im = Image.open(im_file)
im.load()
format = im.format if im.format in KEEP_FORMATS else DEFAULT_FORMAT
if self.adjust_uses_areas:
areas = self.get_areas(storage_path)
else:
areas = None
for adjustment in self.adjustments:
im = adjustment.adjust(im, areas=areas)
adjusted = AdjustedImage(**kwargs)
f = adjusted._meta.get_field('adjusted')
args = (six.text_type(kwargs), datetime.datetime.now().isoformat())
filename = '.'.join((make_hash(*args, step=2), format.lower()))
storage_path = f.generate_filename(adjusted, filename)
final_path = save_image(im, storage_path, format=format,
storage=default_storage)
# Try to handle race conditions gracefully.
try:
adjusted = AdjustedImage.objects.filter(**kwargs
).only('adjusted')[:1][0]
except IndexError:
adjusted.adjusted = final_path
adjusted.save()
else:
default_storage.delete(final_path)
return adjusted
