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from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.utils.functional import cached_property
from django.utils.module_loading import import_string
class InvalidStorageError(ImproperlyConfigured):
pass
class StorageHandler:
def __init__(self, backends=None):
# backends is an optional dict of storage backend definitions
# (structured like settings.STORAGES).
self._backends = backends
self._storages = {}
@cached_property
def backends(self):
if self._backends is None:
self._backends = settings.STORAGES.copy()
return self._backends
def __getitem__(self, alias):
try:
return self._storages[alias]
except KeyError:
try:
params = self.backends[alias]
except KeyError:
raise InvalidStorageError(
f"Could not find config for '{alias}' in settings.STORAGES."
)
storage = self.create_storage(params)
self._storages[alias] = storage
return storage
def create_storage(self, params):
params = params.copy()
backend = params.pop("BACKEND")
options = params.pop("OPTIONS", {})
try:
storage_cls = import_string(backend)
except ImportError as e:
raise InvalidStorageError(f"Could not find backend {backend!r}: {e}") from e
return storage_cls(**options)
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