Implement an locker with Django Cache Framework (https://docs.djangoproject.com/en/1.9/topics/cache/)

locker.py

# -*- coding: utf-8 -*-

# This code is inspired by: 
# 1. http://docs.celeryproject.org/en/latest/tutorials/task-cookbook.html
# 2. http://loose-bits.com/2010/10/distributed-task-locking-in-celery.html

from django.core.cache import caches

class Locker(object):
    """
    This class handling a basic lock using Django cache
    """
    def __init__(self, lock_id, lock_expire):
        """
        Initialize object Locker

        Args:
            lock_id (string): Any unique identificator;
            lock_expire (float): Expire key in X seconds.
        """
        self.lock_id = lock_id
        self.lock_expire = lock_expire
        self.cache = caches['database']
        self.id = id(self)

    def __enter__(self, *args, **kwargs):
        """
        Create 2 keys in cache:
            - first key: {<lockid> : True}
                represents an lock

            - second key: {<id of object> : "owner"}
                represents owner of lock, only owner object has power
                to release locker
        """
        status = self.cache.add(self.lock_id, True, self.lock_expire)
        if status:
            self.cache.add(self.id, "owner", self.lock_expire)
        return status

    def __exit__(self, *args, **kwargs):
        """
        Delete keys
        """
        # if this is owner of lock then release lock
        if self.cache.get(self.id):
            self.cache.delete(self.lock_id)
            self.cache.delete(self.id)
        return True

settings.py

# .... lines ommited here

# To configure your cache read https://docs.djangoproject.com/en/1.9/topics/cache/
# Cache
CACHES = {
    'default': {
        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
        'LOCATION': 'cache_default',
    },
    'database': {
        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
        'LOCATION': 'cache',
    }
}
# .... lines ommited here