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from django.core.cache.backends import filebased
from django_prometheus.cache.metrics import (
django_cache_get_total,
django_cache_hits_total,
django_cache_misses_total,
)
class FileBasedCache(filebased.FileBasedCache):
"""Inherit filebased cache to add metrics about hit/miss ratio"""
def get(self, key, default=None, version=None):
django_cache_get_total.labels(backend="filebased").inc()
cached = super().get(key, default=None, version=version)
if cached is not None:
django_cache_hits_total.labels(backend="filebased").inc()
else:
django_cache_misses_total.labels(backend="filebased").inc()
return cached or default
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