Source code for flask_iiif.cache.simple

# -*- coding: utf-8 -*-
# This file is part of Flask-IIIF
# Copyright (C) 2014, 2015, 2016, 2017 CERN.
# Flask-IIIF is free software; you can redistribute it and/or modify
# it under the terms of the Revised BSD License; see LICENSE file for
# more details.

"""Implement a simple cache."""

from __future__ import absolute_import

from datetime import datetime

from cachelib.simple import SimpleCache

from .cache import ImageCache

[docs]class ImageSimpleCache(ImageCache): """Simple image cache.""" def __init__(self, app=None): """Initialize the cache.""" super(ImageSimpleCache, self).__init__(app=app) self.cache = SimpleCache()
[docs] def get(self, key): """Return the key value. :param key: the object's key :return: the stored object :rtype: `BytesIO` object """ return self.cache.get(key)
[docs] def set(self, key, value, timeout=None): """Cache the object. :param key: the object's key :param value: the stored object :type value: `BytesIO` object :param timeout: the cache timeout in seconds """ timeout = timeout or self.timeout self.cache.set(key, value, timeout) self.set_last_modification(key, timeout=timeout)
[docs] def get_last_modification(self, key): """Get last modification of cached file. :param key: the file object's key """ return self.get(self._last_modification_key_name(key))
[docs] def set_last_modification(self, key, last_modification=None, timeout=None): """Set last modification of cached file. :param key: the file object's key :param last_modification: Last modification date of file represented by the key :type last_modification: datetime.datetime :param timeout: the cache timeout in seconds """ if not last_modification: last_modification = datetime.utcnow().replace(microsecond=0) timeout = timeout or self.timeout self.cache.set( self._last_modification_key_name(key), last_modification, timeout )
[docs] def delete(self, key): """Delete the specific key.""" self.cache.delete(key) self.cache.delete(self._last_modification_key_name(key))
[docs] def flush(self): """Flush the cache.""" self.cache.clear()