openpolitics.com

python-redis-lock

Lock context manager implemented via redis SETNX/BLPOP

.. You would write your functions like this:

from django.core.cache import cache

def function():
    val = cache.get(key)
    if val:
        return val
    else:
        with cache.lock(key):
            val = cache.get(key)
            if val:
                return val
            else:
                # DO EXPENSIVE WORK
                val = ...

                cache.set(key, value)
                return val