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python38
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cachecontrol
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cache.py
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# SPDX-FileCopyrightText: 2015 Eric Larson # # SPDX-License-Identifier: Apache-2.0 """ The cache object API for implementing caches. The default is a thread safe in-memory dictionary. """ from threading import Lock class BaseCache(object): def get(self, key): raise NotImplementedError() def set(self, key, value, expires=None): raise NotImplementedError() def delete(self, key): raise NotImplementedError() def close(self): pass class DictCache(BaseCache): def __init__(self, init_dict=None): self.lock = Lock() self.data = init_dict or {} def get(self, key): return self.data.get(key, None) def set(self, key, value, expires=None): with self.lock: self.data.update({key: value}) def delete(self, key): with self.lock: if key in self.data: self.data.pop(key) class SeparateBodyBaseCache(BaseCache): """ In this variant, the body is not stored mixed in with the metadata, but is passed in (as a bytes-like object) in a separate call to ``set_body()``. That is, the expected interaction pattern is:: cache.set(key, serialized_metadata) cache.set_body(key) Similarly, the body should be loaded separately via ``get_body()``. """ def set_body(self, key, body): raise NotImplementedError() def get_body(self, key): """ Return the body as file-like object. """ raise NotImplementedError()