Disk and file-based cache
Project description
Rationale: file-based cache in Django is essentially broken. Culling files is too costly. Large caches are forced to scan lots of files and do lots of deletes on some operations. Takes too long in the request/response cycle.
Solution: Each operation, “set” and “del” should delete at most two to ten expired keys.
Each “get” needs only check expiry and delete if needed. Make it speedy.
If only we had some kind of file-based database… we do! It’s called SQLite. For metadata and small stuff, use SQLite and for bigger things use files.
Features
Pure-Python
Developed on Python 2.7
Tested on CPython 2.6, 2.7, 3.3, 3.4, 3.5 and PyPy, PyPy3
Get full_path reference to value.
Allow storing raw data.
Small values stored in database.
Leverages SQLite native types: int, float, unicode, blob.
Thread-safe and process-safe.
Multiple eviction policies - Least-Recently-Store - Least-Recently-Used - Least-Frequently-Used
Stampede barrier decorator.
Metadata support for “tag” to evict a group of keys at once.
Quickstart
Installing DiskCache is simple with pip:
$ pip install diskcache
You can access documentation in the interpreter with Python’s built-in help function:
>>> from diskcache import DjangoCache >>> help(DjangoCache)
Caveats
Types matter in key equality comparisons. Comparisons like 1 == 1.0 and b'abc' == u'abc' return False.
Tutorial
TODO
Reference and Indices
License
Copyright 2016 Grant Jenks
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
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