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# -*- coding: utf-8 -*-
import time
import logging
from hashlib import md5
# also see: https://djangosnippets.org/snippets/2242/
class RateLimiterFilter(logging.Filter):
def filter(self, record):
from django.conf import settings
from django.core.cache import cache
# Rate is specified as 1 messages logged per N seconds. (aka cache timeout)
rate = getattr(settings, 'RATE_LIMITER_FILTER_RATE', 10)
prefix = getattr(settings, 'RATE_LIMITER_FILTER_PREFIX', 'ratelimiterfilter')
subject = record.getMessage()
cache_key = "%s:%s" % (prefix, md5(subject).hexdigest())
cache_count_key = "%s:count" % cache_key
result = cache.get_many([cache_key, cache_count_key])
value = result.get(cache_key)
cntr = result.get(cache_count_key)
if not cntr:
cntr = 1
cache.set(cache_count_key, cntr, rate + 60)
if value:
cache.incr(cache_count_key)
return False
record.msg = "[%sx] %s" % (cntr, record.msg)
cache.set(cache_key, time.time(), rate)
return True
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