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https://mau.dev/maunium/synapse.git
synced 2024-08-22 02:05:24 +00:00
Fix ExpiringCache.__len__ to be accurate
It used to try and produce an estimate, which was sometimes negative. This caused metrics to be sad, so lets always just calculate it from scratch.
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parent
5230bc1471
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19dc676d1a
@ -16,7 +16,7 @@
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import logging
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import logging
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from collections import OrderedDict
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from collections import OrderedDict
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from six import iteritems
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from six import iteritems, itervalues
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.metrics.background_process_metrics import run_as_background_process
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from synapse.util.caches import register_cache
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from synapse.util.caches import register_cache
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@ -59,8 +59,6 @@ class ExpiringCache(object):
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self.iterable = iterable
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self.iterable = iterable
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self._size_estimate = 0
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self.metrics = register_cache("expiring", cache_name, self)
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self.metrics = register_cache("expiring", cache_name, self)
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if not self._expiry_ms:
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if not self._expiry_ms:
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@ -79,16 +77,11 @@ class ExpiringCache(object):
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now = self._clock.time_msec()
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now = self._clock.time_msec()
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self._cache[key] = _CacheEntry(now, value)
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self._cache[key] = _CacheEntry(now, value)
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if self.iterable:
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self._size_estimate += len(value)
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# Evict if there are now too many items
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# Evict if there are now too many items
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while self._max_len and len(self) > self._max_len:
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while self._max_len and len(self) > self._max_len:
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_key, value = self._cache.popitem(last=False)
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_key, value = self._cache.popitem(last=False)
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if self.iterable:
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if self.iterable:
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removed_len = len(value.value)
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self.metrics.inc_evictions(len(value.value))
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self.metrics.inc_evictions(removed_len)
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self._size_estimate -= removed_len
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else:
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else:
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self.metrics.inc_evictions()
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self.metrics.inc_evictions()
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@ -111,7 +104,9 @@ class ExpiringCache(object):
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return default
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return default
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if self.iterable:
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if self.iterable:
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self._size_estimate -= len(value.value)
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self.metrics.inc_evictions(len(value.value))
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else:
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self.metrics.inc_evictions()
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return value
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return value
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@ -149,7 +144,9 @@ class ExpiringCache(object):
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for k in keys_to_delete:
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for k in keys_to_delete:
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value = self._cache.pop(k)
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value = self._cache.pop(k)
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if self.iterable:
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if self.iterable:
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self._size_estimate -= len(value.value)
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self.metrics.inc_evictions(len(value.value))
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else:
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self.metrics.inc_evictions()
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logger.debug(
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logger.debug(
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"[%s] _prune_cache before: %d, after len: %d",
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"[%s] _prune_cache before: %d, after len: %d",
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@ -158,7 +155,7 @@ class ExpiringCache(object):
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def __len__(self):
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def __len__(self):
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if self.iterable:
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if self.iterable:
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return self._size_estimate
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return sum(len(entry.value) for entry in itervalues(self._cache))
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else:
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else:
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return len(self._cache)
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return len(self._cache)
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