#31734: warnings.warn() fails when looping over memcache_key_warnings()
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Reporter: Rich Rauenzahn | Owner: nobody
Type: Bug | Status: new
Component: Core (Cache system) | Version: 2.2
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Needs documentation: 0 | Needs tests: 0
Patch needs improvement: 0 | Easy pickings: 1
UI/UX: 0 |
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I think I found a bug in cache backends -- while running unit tests I was
getting:
TypeError: 'type' object cannot be interpreted as an integer
I'm not sure why that exact message, but it arises here:
{{{
> .../virtualenv-3.6.8/lib64/python3.6/site-
packages/django/core/cache/backends/base.py(250)validate_key()
248 """
249 for warning in memcache_key_warnings(key):
--> 250 warnings.warn(warning, CacheKeyWarning)
251
252 def incr_version(self, key, delta=1, version=None):
}}}
I think the problem is that for loop is receiving a list of tuples, but
they are interpreted as a list of strings:
{{{
ipdb> key
":1:<redacted but probably invalid for memcache"
# The generator returns tuples of (message, warning type)
ipdb> for x in memcache_key_warnings(key): print(x)
('Cache key contains characters that will cause errors if used with
memcached:
":1:BuildAPI._request:(\'http://buildapi.eng.vmware.com/sb/build/1895757\',
expire=10)"', <class 'django.core.cache.backends.base.CacheKeyWarning'>)
# But "warning" passed to warning.warn() is the tuple...
ipdb> warning
('Cache key contains characters that will cause errors if used with
memcached:
":1:BuildAPI._request:(\'http://buildapi.eng.vmware.com/sb/build/1895757\',
expire=10)"', <class 'django.core.cache.backends.base.CacheKeyWarning'>)
ipdb>
}}}
I think it should be passing warning.warn(warning[0], warning[1]) or
warning.warn(*warning)
Django 2.2.13 is what I am using.
--
Ticket URL: <https://code.djangoproject.com/ticket/31734>
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