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Ensure invalidation list does not grow unboundedly

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This commit is contained in:
Erik Johnston 2016-08-19 15:58:52 +01:00
parent c0d7d9d642
commit 45fd2c8942
4 changed files with 104 additions and 20 deletions
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20
synapse/util/caches/descriptors.py
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@ -25,6 +25,7 @@ from synapse.util.logcontext import (
from . import DEBUG_CACHES, register_cache
from twisted.internet import defer
from collections import namedtuple
import os
import functools
@ -210,16 +211,17 @@ class CacheDescriptor(object):
# whenever we are invalidated
invalidate_callback = kwargs.pop("on_invalidate", None)
# Add our own `cache_context` to argument list if the wrapped function
# has asked for one
self_context = _CacheContext(cache, None)
# Add temp cache_context so inspect.getcallargs doesn't explode
if self.add_cache_context:
kwargs["cache_context"] = self_context
kwargs["cache_context"] = None
arg_dict = inspect.getcallargs(self.orig, obj, *args, **kwargs)
cache_key = tuple(arg_dict[arg_nm] for arg_nm in self.arg_names)
self_context.key = cache_key
# Add our own `cache_context` to argument list if the wrapped function
# has asked for one
if self.add_cache_context:
kwargs["cache_context"] = _CacheContext(cache, cache_key)
try:
cached_result_d = cache.get(cache_key, callback=invalidate_callback)
@ -414,13 +416,7 @@ class CacheListDescriptor(object):
return wrapped
class _CacheContext(object):
__slots__ = ["cache", "key"]
def __init__(self, cache, key):
self.cache = cache
self.key = key
class _CacheContext(namedtuple("_CacheContext", ("cache", "key"))):
def invalidate(self):
self.cache.invalidate(self.key)