90 lines
2.9 KiB
Python
90 lines
2.9 KiB
Python
from django.core.files.storage import Storage, default_storage, storages
|
|
from django.conf import settings
|
|
from django.utils.deconstruct import deconstructible
|
|
from django.utils.module_loading import import_string
|
|
|
|
'''
|
|
TODO: Create a signal to remove instances from cache if modified
|
|
'''
|
|
|
|
import logging
|
|
logger = logging.getLogger(__name__)
|
|
|
|
@deconstructible
|
|
class MultiStorage(Storage):
|
|
''' Django storage class that proxies multiple storage classes.
|
|
|
|
Uses a name prefix to determine store e.g. 'images:foo/bar.jpg'
|
|
'''
|
|
|
|
DELIM = ":"
|
|
|
|
def __init__(self, config=None):
|
|
self.config = config or getattr(settings, 'BRING_YOUR_OWN_STORAGE', {})
|
|
self._cache = {}
|
|
|
|
def get_storage(self, name):
|
|
if name not in self._cache:
|
|
try:
|
|
config = self.config[name]
|
|
except KeyError:
|
|
return default_storage
|
|
klass = import_string(config.pop('storage', 'django.core.files.storage.FileSystemStorage'))
|
|
self._cache[name] = klass(**config)
|
|
return self._cache[name]
|
|
|
|
def split(self, name):
|
|
try:
|
|
storage, p = name.split(self.DELIM, 1)
|
|
return storage, p
|
|
except ValueError:
|
|
raise ValueError(f"Bad storage path [{name}]")
|
|
|
|
def join(self, storage, name):
|
|
return self.DELIM.join((storage, name))
|
|
|
|
def _proxy(self, method, name, *args, **kwargs):
|
|
storage, p = self.split(name)
|
|
result = getattr(self.get_storage(storage), method)(p, *args, **kwargs)
|
|
logger.debug("Proxy: %s(%r, *%r, **%r) => %r", method, p, args, kwargs, result)
|
|
return result
|
|
|
|
def _proxy_name(self, method, name, *args, **kwargs):
|
|
storage, p = self.split(name)
|
|
result = getattr(self.get_storage(storage), method)(p, *args, **kwargs)
|
|
logger.debug("Proxy: %s(%r, *%r, **%r) => %s:%s", method, p, args, kwargs, storage, result)
|
|
return self.join(storage, result)
|
|
|
|
def _open(self, name, mode='rb'):
|
|
return self._proxy('open', name, mode)
|
|
|
|
def path(self, name):
|
|
return self._proxy('path', name)
|
|
|
|
def save(self, name, content, max_length=None):
|
|
return self._proxy_name('save', name, content, max_length)
|
|
|
|
def exists(self, name):
|
|
return self._proxy('exists', name)
|
|
|
|
def delete(self, name):
|
|
return self._proxy('delete', name)
|
|
|
|
def url(self, name):
|
|
return self._proxy('url', name)
|
|
|
|
def get_accessed_time(self, name):
|
|
return self._proxy('get_accessed_time', name)
|
|
|
|
def get_alternative_name(self, file_root, file_ext):
|
|
return self._proxy_name('get_alternative_name', file_root, file_ext)
|
|
|
|
def get_available_name(self, name, max_length=None):
|
|
return self._proxy_name('get_available_name', name, max_length)
|
|
|
|
def get_modified_time(self, name):
|
|
return self._proxy('get_modified_time', name)
|
|
|
|
def __str__(self):
|
|
return "<MultiStorage: {0} storages>".format(len(self.config))
|