mirror of
https://github.com/jazzband/django-constance.git
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b44f5f5409
* Add Django 1.8 to test environments in tox.ini * Update python versions supported by Django master in tox.ini * Don't load 'url' from template library 'future' - it is no longer available in Django master, and is not needed in Django 1.4 and later, which is as far back as django-constance tests * get_cache dropped from Django master * post_syncdb signal dropped * django.utils.importlib dropped There are still errors on some environments that I didn't try to address: * coverage seems broken on py32 * django-master seems currently broken on py27 (non-ASCII character somewhere, I expect django-master will be fixed soon since they still claim py27 support) * django14 seems broken: "NoReverseMatch: u"'admin" is not a registered namespace"
100 lines
3.5 KiB
Python
100 lines
3.5 KiB
Python
from django.core.exceptions import ImproperlyConfigured
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from django.db.models.signals import post_save
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try:
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from django.core.cache import get_cache
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except ImportError:
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from django.core.cache import caches
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def get_cache(name):
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return caches[name]
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try:
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from django.core.cache.backends.locmem import LocMemCache
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except ImportError:
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from django.core.cache.backends.locmem import CacheClass as LocMemCache
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from .. import Backend
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from ... import settings
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class DatabaseBackend(Backend):
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def __init__(self):
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from .models import Constance
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self._model = Constance
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self._prefix = settings.DATABASE_PREFIX
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self._autofill_timeout = settings.DATABASE_CACHE_AUTOFILL_TIMEOUT
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self._autofill_cachekey = 'autofilled'
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if not self._model._meta.installed:
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raise ImproperlyConfigured(
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"The constance.backends.database app isn't installed "
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"correctly. Make sure it's in your INSTALLED_APPS setting.")
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if settings.DATABASE_CACHE_BACKEND:
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self._cache = get_cache(settings.DATABASE_CACHE_BACKEND)
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if isinstance(self._cache, LocMemCache):
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raise ImproperlyConfigured(
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"The CONSTANCE_DATABASE_CACHE_BACKEND setting refers to a "
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"subclass of Django's local-memory backend (%r). Please set "
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"it to a backend that supports cross-process caching."
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% settings.DATABASE_CACHE_BACKEND)
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else:
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self._cache = None
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self.autofill()
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# Clear simple cache.
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post_save.connect(self.clear, sender=self._model)
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def add_prefix(self, key):
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return "%s%s" % (self._prefix, key)
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def autofill(self):
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if not self._autofill_timeout or not self._cache:
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return
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full_cachekey = self.add_prefix(self._autofill_cachekey)
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if self._cache.get(full_cachekey):
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return
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autofill_values = {}
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autofill_values[full_cachekey] = 1
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for key, value in self.mget(settings.CONFIG.keys()):
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autofill_values[self.add_prefix(key)] = value
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self._cache.set_many(autofill_values, timeout=self._autofill_timeout)
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def mget(self, keys):
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if not keys:
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return
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keys = dict((self.add_prefix(key), key) for key in keys)
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stored = self._model._default_manager.filter(key__in=keys.keys())
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for const in stored:
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yield keys[const.key], const.value
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def get(self, key):
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key = self.add_prefix(key)
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if self._cache:
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value = self._cache.get(key)
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else:
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value = None
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if value is None:
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try:
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value = self._model._default_manager.get(key=key).value
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except self._model.DoesNotExist:
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pass
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else:
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if self._cache:
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self._cache.add(key, value)
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return value
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def set(self, key, value):
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constance, created = self._model._default_manager.get_or_create(
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key=self.add_prefix(key), defaults={'value': value}
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)
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if not created:
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constance.value = value
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constance.save()
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def clear(self, sender, instance, created, **kwargs):
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if self._cache and not created:
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keys = [self.add_prefix(k)
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for k in settings.CONFIG.keys()]
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keys.append(self.add_prefix(self._autofill_cachekey))
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self._cache.delete_many(keys)
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self.autofill()
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