"""passbook policy signals"""
from django.core.cache import cache
from django.db.models.signals import post_save
from django.dispatch import receiver
from structlog import get_logger
LOGGER = get_logger()
@receiver(post_save)
# pylint: disable=unused-argument
def invalidate_policy_cache(sender, instance, **_):
"""Invalidate Policy cache when policy is updated"""
from passbook.policies.models import Policy, PolicyBinding
if isinstance(instance, Policy):
total = 0
for binding in PolicyBinding.objects.filter(policy=instance):
prefix = (
f"policy_{binding.policy_binding_uuid.hex}_{binding.policy.pk.hex}*"
)
keys = cache.keys(prefix)
total += len(keys)
cache.delete_many(keys)
LOGGER.debug("Invalidating policy cache", policy=instance, keys=total)
