Documentation

Full documentation with examples and references: http://ring-cache.readthedocs.io/

• Function/method support.

• asyncio support.

• Django support.

• Bulk access support.

Function cache

import ring
import memcache
import requests

mc = memcache.Client(['127.0.0.1:11211'])

# working for mc, expire in 60sec
@ring.memcache(mc, time=60)
def get_url(url):
    return requests.get(url).content

# normal way - it is cached
data = get_url('http://example.com')

It is a normal smart cache flow.

But ring is different when you want to explicitly control it.

# delete the cache
get_url.delete('http://example.com')
# get cached data or None
data_or_none = get_url.get('http://example.com')

# get internal cache key
key = get_url.key('http://example.com')
# and access directly to the backend
direct_data = mc.get(key)

Method cache

import ring
import redis

rc = redis.StrictRedis()

class User(dict):
    def __ring_key__(self):
        return self['id']

    # working for rc, no expiration
    # using json coder for non-bytes cache data
    @ring.redis(rc, coder='json')
    def data(self):
        return self.copy()

    # parameters are also ok!
    @ring.redis(rc, coder='json')
    def child(self, child_id):
        return {'user_id': self['id'], 'child_id': child_id}

user = User(id=42, name='Ring')

# create and get cache
user_data = user.data()  # cached
user['name'] = 'Ding'
# still cached
cached_data = user.data()
assert user_data == cached_data
# refresh
updated_data = user.data.update()
assert user_data != updated_data

# id is the cache key so...
user2 = User(id=42)
# still hitting the same cache
assert updated_data == user2.data()

Installation

PyPI is the recommended way.

$ pip install ring

To browse versions and tarballs, visit:

https://pypi.python.org/pypi/ring/

To use memcached or redis, don’t forget to install related libraries. For example: python-memcached, python3-memcached, pylibmc, redis-py, Django etc

It may require to install and run related services on your system too. Look for memcached and redis for your system.

Contributors

See contributors list on:

https://github.com/youknowone/ring/graphs/contributors