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# Copyright (C) 2016-2017 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""File caches."""
from public import public
from zope.interface import Interface
@public
class ICacheManager(Interface):
"""Manager for managing cached files."""
def add(key, contents, lifetime=None):
"""Add the contents to the cache, indexed by the key.
If there is already some contents cached under the given key, the old
contents are overwritten with the new contents.
:param key: The key to use when storing the contents.
:type name: str
:param contents: The contents to store in the cache. If this is a
bytes object, it will be stored on disk in binary. If it's a str,
it will be stored in UTF-8. Either way, the manager will remember
the type and return it when you access the file.
:type contents: bytes or str
:param lifetime: How long should the file be cached for, before it
expires (leading to its eventual eviction)? If not given, the
system default lifetime is used.
:type lifetime: datetime.timedelta
:return: The SHA256 hash under which the file contents are stored.
:rtype: str
"""
def get(key, *, expunge=False):
"""Return the contents cached under the given key.
:param key: The key identifying the contents you want to retrieve.
:type key: str
:param expunge: A flag indicating whether the file contents should
also be removed from the cache.
:type expunge: bool
:return: The contents of the cached file or None if the given id isn't
in the cache (or it's already expired).
:rtype: bytes or str, depending on the original contents.
"""
def evict():
"""Evict all files which have expired."""
def clear():
"""Clear the entire cache of files."""
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