87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
from django.core.files.storage import Storage
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from django.conf import settings
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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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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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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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config = self.config[name]
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self._cache[name] = get_storage_class(config['storage'])(**config['settings'])
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return self._cache[name]
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def split(self, name):
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return name.split("/", 1)
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def _proxy(self, method, name, *args, **kwargs):
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print('PROXY', 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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print("RESULT", result)
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return result
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def _proxy_name(self, method, name, *args, **kwargs):
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print('PROXY_NAME', 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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print("RESULT", result)
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return f"{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 _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 get_valid_name(self, name):
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return self._proxy_name('get_valid_name', name)
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class BYOStorage(MultiStorage):
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''' Database driven Bring-Your-Own-Storage
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Multiple storages can
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'''
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def get_storage(self, name):
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if name not in self._cache:
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# use storage from config by default
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if name in self.config:
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return super(BYOStorage, self).get_storage(name)
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from .models import UserStorage
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obj = UserStorage.objects.get(name=name)
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self._cache[name] = obj.instance()
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return self._cache[name] |