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from django.core.cache import cache
from django.utils import crypto
GENERATION_KEY_NAME = "metric:generation"
def generation_key(timeout=60 * 60 * 24 * 365):
"""
A random key to be used in cache calls that allows
invalidating all values created with it. Use it with
the version parameter of cache.get/set.
"""
generation = cache.get(GENERATION_KEY_NAME)
if generation is None:
generation = crypto.get_random_string(length=12)
cache.set(GENERATION_KEY_NAME, generation, timeout)
return generation
def reset_generation_key():
"""
Invalidate all cache entries created with the generation key.
"""
cache.delete(GENERATION_KEY_NAME)
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