def _open(self, name, mode):
if 'w' in mode or '+' in mode or 'a' in mode:
raise ValueError('FiletrackerStorage.open does not support '
'writing. Use FiletrackerStorage.save.')
path = self._make_filetracker_path(name)
reader, _version = self.client.get_stream(path)
return File(reader, FiletrackerFilename(name))
def _save(self, name, content):
path = self._make_filetracker_path(name)
if hasattr(content, 'temporary_file_path'):
filename = content.temporary_file_path()
elif getattr(content, 'file', None) \
and hasattr(content.file, 'name') \
and os.path.isfile(content.file.name):
filename = content.file.name
elif DJANGO_VERSION < (1, 11) and isinstance(getattr(content, 'file', None),
FileInFiletracker):
# This happens when used with field assignment
# We are ignoring suggested name, as copying files in filetracker
# isn't implemented
return content.file.name
elif isinstance(content, FileInFiletracker):
# This happens when file_field.save(path, file) is called
# explicitly
if DJANGO_VERSION < (1, 11):
raise NotImplementedError("Filename cannot be changed")
else:
return content.name
else:
f = tempfile.NamedTemporaryFile()
for chunk in content.chunks():
f.write(chunk)
f.flush()
filename = f.name
# If there will be only local store, filetracker will ignore
# 'to_local_store' argument.
name = self._cut_prefix(self.client.put_file(path, filename,
to_local_store=False))
name = FiletrackerFilename(name)
content.close()
return name
def filetracker_to_django_file(filetracker_path, storage=None):
"""Returns a :class:`~django.core.files.File` representing an existing
Filetracker file (usable only for assigning to a
:class:`~django.db.models.FileField`)"""
if storage is None:
storage = default_storage
prefix_len = len(storage.prefix.rstrip('/'))
if not filetracker_path.startswith(storage.prefix) or \
filetracker_path[prefix_len:prefix_len + 1] != '/':
raise ValueError('Path %s is outside of storage prefix %s' %
(filetracker_path, storage.prefix))
return FileInFiletracker(
storage, FiletrackerFilename(filetracker_path[prefix_len + 1:]))
def read_using_cache(self, name):
"""Opens a file using a cache (if it's possible)"""
path = self._make_filetracker_path(name)
reader, _version = self.client.get_stream(path, serve_from_cache=True)
return File(reader, FiletrackerFilename(name))
def __init__(self, instance, field, name):
if name is not None:
name = FiletrackerFilename(name)
super(FieldFile, self).__init__(instance, field, name)