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74 lines
2.7 KiB
Python
74 lines
2.7 KiB
Python
#
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# managers.py -- Model managers for siteconfig objects
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#
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# Copyright (c) 2008-2009 Christian Hammond
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#
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from django.contrib.sites.models import Site
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from django.db import models
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_SITECONFIG_CACHE = {}
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class SiteConfigurationManager(models.Manager):
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"""
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A Manager that provides a get_current function for retrieving the
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SiteConfiguration for this particular running site.
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"""
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def get_current(self):
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"""
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Returns the site configuration on the active site.
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"""
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from djblets.siteconfig.models import SiteConfiguration
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global _SITECONFIG_CACHE
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# This will handle raising a ImproperlyConfigured if not set up
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# properly.
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site = Site.objects.get_current()
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if site.id not in _SITECONFIG_CACHE:
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_SITECONFIG_CACHE[site.id] = \
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SiteConfiguration.objects.get(site=site)
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return _SITECONFIG_CACHE[site.id]
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def clear_cache(self):
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global _SITECONFIG_CACHE
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_SITECONFIG_CACHE = {}
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def check_expired(self):
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"""
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Checks each cached SiteConfiguration to find out if its settings
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have expired. This should be called on each request to ensure that
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the copy of the settings is up-to-date in case another web server
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worker process modifies the settings in the database.
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"""
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global _SITECONFIG_CACHE
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for key, siteconfig in _SITECONFIG_CACHE.copy().iteritems():
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if siteconfig.is_expired():
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try:
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# This is stale. Get rid of it so we can load it next time.
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del _SITECONFIG_CACHE[key]
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except KeyError:
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pass
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