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Re-implement DEBUG_CACHES flag

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This commit is contained in:
Erik Johnston 2015-08-06 14:01:05 +01:00
parent 2efb93af52
commit 433314cc34
1 changed files with 17 additions and 2 deletions
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19
synapse/storage/_base.py
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@ -178,8 +178,23 @@ class CacheDescriptor(object):
arg_dict = inspect.getcallargs(self.orig, obj, *args, **kwargs)
keyargs = [arg_dict[arg_nm] for arg_nm in self.arg_names]
try:
cached_result = cache.get(*keyargs)
return cached_result.observe()
cached_result_d = cache.get(*keyargs)
if DEBUG_CACHES:
@defer.inlineCallbacks
def check_result(cached_result):
actual_result = yield self.function_to_call(obj, *args, **kwargs)
if actual_result != cached_result:
logger.error(
"Stale cache entry %s%r: cached: %r, actual %r",
self.orig.__name__, keyargs,
cached_result, actual_result,
)
raise ValueError("Stale cache entry")
cached_result_d.observe().addCallback(check_result)
return cached_result_d.observe()
except KeyError:
# Get the sequence number of the cache before reading from the
# database so that we can tell if the cache is invalidated