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