#26888: RegexURLResolver doesn't work in threaded environments -------------------------------------------+------------------------- Reporter: MarkusH | Owner: MarkusH Type: Uncategorized | Status: new Component: Core (URLs) | Version: 1.10 Severity: Release blocker | Keywords: Triage Stage: Accepted | Has patch: 0 Needs documentation: 0 | Needs tests: 0 Patch needs improvement: 0 | Easy pickings: 0 UI/UX: 0 | -------------------------------------------+------------------------- As reported on [https://groups.google.com/forum/#!topic/django- developers/D_bIeinKHjE django-developers]:
I'm using django (1, 10, 0, u'beta', 1). When I try to reverse url in shell everything goes fine. When under nginx/uwsgi with many concurrent request I get {{{#!python ... /local/lib/python2.7/site-packages/django/urls/resolvers.py", line 241, in reverse_dict return self._reverse_dict[language_code] KeyError: 'it' }}} After a wile I figured out that RegexURLResolver is memoized by `get_resolver` and so it acts like a singleton for a certain number of requests. Analyzing the code of RegexURLResolver I found that the method `_poupulate` will return directly if it has been called before and not yet finished. {{{#!python ... def _populate(self): if self._populating: return self._populating = True ... }}} if used for recursive call in a single thread this will not hurt, but in my case in uwsgi multi thread mode I got the error. here is my quick and dirty fix: {{{#!python class RegexURLResolver(LocaleRegexProvider): def __init__(self, regex, urlconf_name, default_kwargs=None, app_name=None, namespace=None): ... self._populating = False self.RLock = threading.RLock() ... def _populate(self): if self._populating: self.RLock.acquire() self.RLock.release() return self._populating = True self.RLock.acquire() ... self._populating = False self.RLock.release() }}} -- Ticket URL: <https://code.djangoproject.com/ticket/26888> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To post to this group, send email to django-updates@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/050.be37cb4a04b79a8c21cbd19a074c7b06%40djangoproject.com. For more options, visit https://groups.google.com/d/optout.