a quick and dirty way to help dull django cache framework

gistfile1.py

from django.core.cache import cache

""" 
a quick and dirty way to help dull django cache framework

Stores another copy of cache value with longer timeout value.
So, this will prevent multiple instances create a new copy of cache at same time.

Usage : Import this instead of 'django.core.cache'
        and use your cache-related codes without any changes.

written by [email protected]
"""

suffix_for_backup = "__doublecached__"
suffix_for_lock = "__doublecache__lock__"
additional_timeout = 5 * 60 # 5 minutes

cache.original_get = cache.get
cache.original_set = cache.set

def get(key, default=None, version=None):
    res = cache.original_get(key, default, version)

    if res is None:
        if cache.original_get(key+suffix_for_lock):
            res = cache.original_get(key+suffix_for_backup, None, version)
        else:
            cache.original_set(key+suffix_for_lock, '1', additional_timeout)

    return res

def set(key, value, timeout=None, version=None):
    timeout_for_buffer = additional_timeout 
    if type(timeout) is int: timeout_for_buffer += timeout

    cache.original_set(key+suffix_for_backup, value, timeout_for_buffer, version)
    cache.delete(key+suffix_for_lock, version)
    return cache.original_set(key, value, timeout, version)

cache.get = get
cache.set = set