38 lines
1.4 KiB
Python
38 lines
1.4 KiB
Python
"""passbook flow signals"""
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from django.core.cache import cache
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from django.db.models.signals import post_save
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from django.dispatch import receiver
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from structlog import get_logger
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LOGGER = get_logger()
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def delete_cache_prefix(prefix: str) -> int:
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"""Delete keys prefixed with `prefix` and return count of deleted keys."""
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keys = cache.keys(prefix)
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cache.delete_many(keys)
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return len(keys)
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@receiver(post_save)
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# pylint: disable=unused-argument
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def invalidate_flow_cache(sender, instance, **_):
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"""Invalidate flow cache when flow is updated"""
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from passbook.flows.models import Flow, FlowStageBinding, Stage
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from passbook.flows.planner import cache_key
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if isinstance(instance, Flow):
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total = delete_cache_prefix(f"{cache_key(instance)}*")
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LOGGER.debug("Invalidating Flow cache", flow=instance, len=total)
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if isinstance(instance, FlowStageBinding):
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total = delete_cache_prefix(f"{cache_key(instance.flow)}*")
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LOGGER.debug(
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"Invalidating Flow cache from FlowStageBinding", binding=instance, len=total
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)
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if isinstance(instance, Stage):
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total = 0
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for binding in FlowStageBinding.objects.filter(stage=instance):
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prefix = cache_key(binding.flow)
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total += delete_cache_prefix(f"{prefix}*")
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LOGGER.debug("Invalidating Flow cache from Stage", stage=instance, len=total)
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