https://github.com/aio-libs/async-lru

Simple LRU cache for asyncio
https://github.com/aio-libs/async-lru

asyncio lru lru-cache

Last synced: about 2 months ago
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Simple LRU cache for asyncio

• Host: GitHub
• URL: https://github.com/aio-libs/async-lru
• Owner: aio-libs
• License: mit
• Created: 2017-02-20T14:06:47.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2024-05-19T13:42:33.000Z (4 months ago)
• Last Synced: 2024-05-19T14:44:47.800Z (4 months ago)
• Topics: asyncio, lru, lru-cache
• Language: Python
• Homepage: https://pypi.org/p/async-lru
• Size: 363 KB
• Stars: 632
• Watchers: 21
• Forks: 48
• Open Issues: 5
• Metadata Files:
  • Readme: README.rst
  • Changelog: CHANGES.rst
  • License: LICENSE

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README

        
async-lru

=========

:info: Simple lru cache for asyncio

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Installation

------------

.. code-block:: shell

    pip install async-lru

Usage

-----

This package is a port of Python's built-in `functools.lru_cache `_ function for `asyncio `_. To better handle async behaviour, it also ensures multiple concurrent calls will only result in 1 call to the wrapped function, with all ``await``\s receiving the result of that call when it completes.

.. code-block:: python

    import asyncio

    import aiohttp

    from async_lru import alru_cache

    @alru_cache(maxsize=32)

    async def get_pep(num):

        resource = 'http://www.python.org/dev/peps/pep-%04d/' % num

        async with aiohttp.ClientSession() as session:

            try:

                async with session.get(resource) as s:

                    return await s.read()

            except aiohttp.ClientError:

                return 'Not Found'

    async def main():

        for n in 8, 290, 308, 320, 8, 218, 320, 279, 289, 320, 9991:

            pep = await get_pep(n)

            print(n, len(pep))

        print(get_pep.cache_info())

        # CacheInfo(hits=3, misses=8, maxsize=32, currsize=8)

        # closing is optional, but highly recommended

        await get_pep.cache_close()

    asyncio.run(main())

TTL (time-to-live, expiration on timeout) is supported by accepting `ttl` configuration

parameter (off by default):

.. code-block:: python

    @alru_cache(ttl=5)

    async def func(arg):

        return arg * 2

The library supports explicit invalidation for specific function call by

`cache_invalidate()`:

.. code-block:: python

    @alru_cache(ttl=5)

    async def func(arg1, arg2):

        return arg1 + arg2

    func.cache_invalidate(1, arg2=2)

The method returns `True` if corresponding arguments set was cached already, `False`

otherwise.

Python 3.8+ is required

Thanks

------

The library was donated by `Ocean S.A. `_

Thanks to the company for contribution.