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Fixed #21012 -- New API to access cache backends. 

Thanks Curtis Malony and Florian Apolloner.

Squashed commit of the following:

commit 3380495e93
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 14:18:07 2013 +0100

    Looked up the template_fragments cache at runtime.

commit 905a74f52b
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 14:19:48 2013 +0100

    Removed all uses of create_cache.

    Refactored the cache tests significantly.

    Made it safe to override the CACHES setting.

commit 35e289fe92
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 12:23:57 2013 +0100

    Removed create_cache function.

commit 8e274f747a
Author: Aymeric Augustin <aymeric.augustin@m4x.org>
Date:   Sat Nov 23 12:04:52 2013 +0100

    Updated docs to describe a simplified cache backend API.

commit ee7eb0f73e
Author: Curtis Maloney <curtis@tinbrain.net>
Date:   Sat Oct 19 09:49:24 2013 +1100

    Fixed #21012 -- Thread-local caches, like databases.
This commit is contained in:
Curtis Maloney 2013-10-19 09:49:24 +11:00 committed by Aymeric Augustin
parent 3ca0815c0b
commit ffc37e2343
16 changed files with 729 additions and 606 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
django/contrib/sessions/backends/cache.py
View File

@ -1,6 +1,6 @@
from django.conf import settings
from django.contrib.sessions.backends.base import SessionBase, CreateError
from django.core.cache import get_cache
from django.core.cache import caches
from django.utils.six.moves import xrange
KEY_PREFIX = "django.contrib.sessions.cache"
@ -11,7 +11,7 @@ class SessionStore(SessionBase):
A cache-based session store.
"""
def __init__(self, session_key=None):
self._cache = get_cache(settings.SESSION_CACHE_ALIAS)
self._cache = caches[settings.SESSION_CACHE_ALIAS]
super(SessionStore, self).__init__(session_key)
@property

4
django/contrib/sessions/backends/cached_db.py
View File

@ -6,7 +6,7 @@ import logging
from django.conf import settings
from django.contrib.sessions.backends.db import SessionStore as DBStore
from django.core.cache import get_cache
from django.core.cache import caches
from django.core.exceptions import SuspiciousOperation
from django.utils import timezone
from django.utils.encoding import force_text
@ -20,7 +20,7 @@ class SessionStore(DBStore):
"""
def __init__(self, session_key=None):
self._cache = get_cache(settings.SESSION_CACHE_ALIAS)
self._cache = caches[settings.SESSION_CACHE_ALIAS]
super(SessionStore, self).__init__(session_key)
@property

11
django/contrib/sessions/tests.py
View File

@ -15,7 +15,7 @@ from django.contrib.sessions.backends.file import SessionStore as FileSession
from django.contrib.sessions.backends.signed_cookies import SessionStore as CookieSession
from django.contrib.sessions.models import Session
from django.contrib.sessions.middleware import SessionMiddleware
from django.core.cache import get_cache
from django.core.cache import caches
from django.core.cache.backends.base import InvalidCacheBackendError
from django.core import management
from django.core.exceptions import ImproperlyConfigured
@ -140,7 +140,7 @@ class SessionTestsMixin(object):
self.assertTrue(self.session.modified)
def test_save(self):
if (hasattr(self.session, '_cache') and'DummyCache' in
if (hasattr(self.session, '_cache') and 'DummyCache' in
settings.CACHES[settings.SESSION_CACHE_ALIAS]['BACKEND']):
raise unittest.SkipTest("Session saving tests require a real cache backend")
self.session.save()
@ -481,7 +481,7 @@ class CacheSessionTests(SessionTestsMixin, unittest.TestCase):
def test_default_cache(self):
self.session.save()
self.assertNotEqual(get_cache('default').get(self.session.cache_key), None)
self.assertNotEqual(caches['default'].get(self.session.cache_key), None)
@override_settings(CACHES={
'default': {
@ -489,6 +489,7 @@ class CacheSessionTests(SessionTestsMixin, unittest.TestCase):
},
'sessions': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'session',
},
}, SESSION_CACHE_ALIAS='sessions')
def test_non_default_cache(self):
@ -496,8 +497,8 @@ class CacheSessionTests(SessionTestsMixin, unittest.TestCase):
self.session = self.backend()
self.session.save()
self.assertEqual(get_cache('default').get(self.session.cache_key), None)
self.assertNotEqual(get_cache('sessions').get(self.session.cache_key), None)
self.assertEqual(caches['default'].get(self.session.cache_key), None)
self.assertNotEqual(caches['sessions'].get(self.session.cache_key), None)
class SessionMiddlewareTests(unittest.TestCase):

4
django/contrib/staticfiles/storage.py
View File

@ -7,7 +7,7 @@ import posixpath
import re
from django.conf import settings
from django.core.cache import (get_cache, InvalidCacheBackendError,
from django.core.cache import (caches, InvalidCacheBackendError,
cache as default_cache)
from django.core.exceptions import ImproperlyConfigured
from django.core.files.base import ContentFile
@ -56,7 +56,7 @@ class CachedFilesMixin(object):
def __init__(self, *args, **kwargs):
super(CachedFilesMixin, self).__init__(*args, **kwargs)
try:
self.cache = get_cache('staticfiles')
self.cache = caches['staticfiles']
except InvalidCacheBackendError:
# Use the default backend
self.cache = default_cache

76
django/core/cache/__init__.py vendored
View File

@ -6,14 +6,15 @@ In a nutshell, a cache is a set of values -- which can be any object that
may be pickled -- identified by string keys. For the complete API, see
the abstract BaseCache class in django.core.cache.backends.base.
Client code should not access a cache backend directly; instead it should
either use the "cache" variable made available here, or it should use the
get_cache() function made available here. get_cache() takes a CACHES alias or a
backend path and config parameters, and returns an instance of a backend cache
class.
Client code should use the `cache` variable defined here to access the default
cache backend and look up non-default cache backends in the `caches` dict-like
object.
See docs/topics/cache.txt for information on the public API.
"""
from threading import local
import warnings
from django.conf import settings
from django.core import signals
from django.core.cache.backends.base import (
@ -35,14 +36,14 @@ if DEFAULT_CACHE_ALIAS not in settings.CACHES:
def get_cache(backend, **kwargs):
"""
Function to load a cache backend dynamically. This is flexible by design
Function to create a cache backend dynamically. This is flexible by design
to allow different use cases:
To load a backend that is pre-defined in the settings::
cache = get_cache('default')
To load a backend with its dotted import path,
To create a backend with its dotted import path,
including arbitrary options::
cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', **{
@ -50,6 +51,12 @@ def get_cache(backend, **kwargs):
})
"""
warnings.warn("'get_cache' is deprecated in favor of 'caches'.",
PendingDeprecationWarning, stacklevel=2)
return _create_cache(backend, **kwargs)
def _create_cache(backend, **kwargs):
try:
# Try to get the CACHES entry for the given backend name first
try:
@ -79,4 +86,57 @@ def get_cache(backend, **kwargs):
signals.request_finished.connect(cache.close)
return cache
cache = get_cache(DEFAULT_CACHE_ALIAS)
class CacheHandler(object):
"""
A Cache Handler to manage access to Cache instances.
Ensures only one instance of each alias exists per thread.
"""
def __init__(self):
self._caches = local()
def __getitem__(self, alias):
try:
return getattr(self._caches, alias)
except AttributeError:
pass
if alias not in settings.CACHES:
raise InvalidCacheBackendError(
"Could not find config for '%s' in settings.CACHES" % alias
)
cache = _create_cache(alias)
setattr(self._caches, alias, cache)
return cache
caches = CacheHandler()
class DefaultCacheProxy(object):
"""
Proxy access to the default Cache object's attributes.
This allows the legacy `cache` object to be thread-safe using the new
``caches`` API.
"""
def __getattr__(self, name):
return getattr(caches[DEFAULT_CACHE_ALIAS], name)
def __setattr__(self, name, value):
return setattr(caches[DEFAULT_CACHE_ALIAS], name, value)
def __delattr__(self, name):
return delattr(caches[DEFAULT_CACHE_ALIAS], name)
def __contains__(self, key):
return key in caches[DEFAULT_CACHE_ALIAS]
def __eq__(self, other):
return caches[DEFAULT_CACHE_ALIAS] == other
def __ne__(self, other):
return caches[DEFAULT_CACHE_ALIAS] != other
cache = DefaultCacheProxy()

14
django/core/cache/backends/memcached.py vendored
View File

@ -2,13 +2,13 @@
import time
import pickle
from threading import local
from django.core.cache.backends.base import BaseCache, DEFAULT_TIMEOUT
from django.utils import six
from django.utils.deprecation import RenameMethodsBase
from django.utils.encoding import force_str
from django.utils.functional import cached_property
class BaseMemcachedCacheMethods(RenameMethodsBase):
@ -177,24 +177,14 @@ class PyLibMCCache(BaseMemcachedCache):
"An implementation of a cache binding using pylibmc"
def __init__(self, server, params):
import pylibmc
self._local = local()
super(PyLibMCCache, self).__init__(server, params,
library=pylibmc,
value_not_found_exception=pylibmc.NotFound)
@property
@cached_property
def _cache(self):
# PylibMC uses cache options as the 'behaviors' attribute.
# It also needs to use threadlocals, because some versions of
# PylibMC don't play well with the GIL.
client = getattr(self._local, 'client', None)
if client:
return client
client = self._lib.Client(self._servers)
if self._options:
client.behaviors = self._options
self._local.client = client
return client

4
django/core/management/commands/createcachetable.py
View File

@ -1,7 +1,7 @@
from optparse import make_option
from django.conf import settings
from django.core.cache import get_cache
from django.core.cache import caches
from django.core.cache.backends.db import BaseDatabaseCache
from django.core.management.base import BaseCommand, CommandError
from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
@ -30,7 +30,7 @@ class Command(BaseCommand):
self.create_table(db, tablename)
else:
for cache_alias in settings.CACHES:
cache = get_cache(cache_alias)
cache = caches[cache_alias]
if isinstance(cache, BaseDatabaseCache):
self.create_table(db, cache._table)

50
django/middleware/cache.py
View File

@ -46,7 +46,7 @@ More details about how the caching works:
import warnings
from django.conf import settings
from django.core.cache import get_cache, DEFAULT_CACHE_ALIAS
from django.core.cache import caches, DEFAULT_CACHE_ALIAS
from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age
@ -64,7 +64,7 @@ class UpdateCacheMiddleware(object):
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache = get_cache(self.cache_alias)
self.cache = caches[self.cache_alias]
def _session_accessed(self, request):
try:
@ -122,10 +122,9 @@ class FetchFromCacheMiddleware(object):
MIDDLEWARE_CLASSES so that it'll get called last during the request phase.
"""
def __init__(self):
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache = get_cache(self.cache_alias)
self.cache = caches[self.cache_alias]
def process_request(self, request):
"""
@ -169,39 +168,32 @@ class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
# we fall back to system defaults. If it is not provided at all,
# we need to use middleware defaults.
cache_kwargs = {}
try:
key_prefix = kwargs['key_prefix']
if key_prefix is None:
key_prefix = ''
except KeyError:
key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.key_prefix = key_prefix
try:
self.key_prefix = kwargs['key_prefix']
if self.key_prefix is not None:
cache_kwargs['KEY_PREFIX'] = self.key_prefix
else:
self.key_prefix = ''
cache_alias = kwargs['cache_alias']
if cache_alias is None:
cache_alias = DEFAULT_CACHE_ALIAS
except KeyError:
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
cache_kwargs['KEY_PREFIX'] = self.key_prefix
cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
self.cache_alias = cache_alias
try:
self.cache_alias = kwargs['cache_alias']
if self.cache_alias is None:
self.cache_alias = DEFAULT_CACHE_ALIAS
if cache_timeout is not None:
cache_kwargs['TIMEOUT'] = cache_timeout
except KeyError:
self.cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
if cache_timeout is None:
cache_kwargs['TIMEOUT'] = settings.CACHE_MIDDLEWARE_SECONDS
else:
cache_kwargs['TIMEOUT'] = cache_timeout
if cache_timeout is None:
cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.cache_timeout = cache_timeout
if cache_anonymous_only is None:
self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
else:
self.cache_anonymous_only = cache_anonymous_only
cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self.cache_anonymous_only = cache_anonymous_only
if self.cache_anonymous_only:
msg = "CACHE_MIDDLEWARE_ANONYMOUS_ONLY has been deprecated and will be removed in Django 1.8."
warnings.warn(msg, DeprecationWarning, stacklevel=1)
self.cache = get_cache(self.cache_alias, **cache_kwargs)
self.cache_timeout = self.cache.default_timeout
self.cache = caches[self.cache_alias]

19
django/templatetags/cache.py
View File

@ -1,16 +1,11 @@
from __future__ import unicode_literals
from django.core.cache import get_cache, InvalidCacheBackendError
from django.core.cache import cache, caches, InvalidCacheBackendError
from django.core.cache.utils import make_template_fragment_key
from django.template import Library, Node, TemplateSyntaxError, VariableDoesNotExist
register = Library()
try:
default_cache = get_cache('template_fragments')
except InvalidCacheBackendError:
from django.core.cache import cache as default_cache
class CacheNode(Node):
def __init__(self, nodelist, expire_time_var, fragment_name, vary_on, cache_name):
@ -35,17 +30,21 @@ class CacheNode(Node):
except VariableDoesNotExist:
raise TemplateSyntaxError('"cache" tag got an unknown variable: %r' % self.cache_name.var)
try:
cache = get_cache(cache_name)
fragment_cache = caches[cache_name]
except InvalidCacheBackendError:
raise TemplateSyntaxError('Invalid cache name specified for cache tag: %r' % cache_name)
else:
cache = default_cache
try:
fragment_cache = caches['template_fragments']
except InvalidCacheBackendError:
fragment_cache = caches['default']
vary_on = [var.resolve(context) for var in self.vary_on]
cache_key = make_template_fragment_key(self.fragment_name, vary_on)
value = cache.get(cache_key)
value = fragment_cache.get(cache_key)
if value is None:
value = self.nodelist.render(context)
cache.set(cache_key, value, expire_time)
fragment_cache.set(cache_key, value, expire_time)
return value

8
django/test/signals.py
View File

@ -1,5 +1,6 @@
import os
import time
import threading
import warnings
from django.conf import settings
@ -19,6 +20,13 @@ setting_changed = Signal(providing_args=["setting", "value", "enter"])
COMPLEX_OVERRIDE_SETTINGS = set(['DATABASES'])
@receiver(setting_changed)
def clear_cache_handlers(**kwargs):
if kwargs['setting'] == 'CACHES':
from django.core.cache import caches
caches._caches = threading.local()
@receiver(setting_changed)
def update_connections_time_zone(**kwargs):
if kwargs['setting'] == 'TIME_ZONE':

6
django/utils/cache.py
View File

@ -23,7 +23,7 @@ import re
import time
from django.conf import settings
from django.core.cache import get_cache
from django.core.cache import caches
from django.utils.encoding import iri_to_uri, force_bytes, force_text
from django.utils.http import http_date
from django.utils.timezone import get_current_timezone_name
@ -219,7 +219,7 @@ def get_cache_key(request, key_prefix=None, method='GET', cache=None):
key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
cache_key = _generate_cache_header_key(key_prefix, request)
if cache is None:
cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
headerlist = cache.get(cache_key, None)
if headerlist is not None:
return _generate_cache_key(request, method, headerlist, key_prefix)
@ -246,7 +246,7 @@ def learn_cache_key(request, response, cache_timeout=None, key_prefix=None, cach
cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
cache_key = _generate_cache_header_key(key_prefix, request)
if cache is None:
cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
cache = caches[settings.CACHE_MIDDLEWARE_ALIAS]
if response.has_header('Vary'):
is_accept_language_redundant = settings.USE_I18N or settings.USE_L10N
# If i18n or l10n are used, the generated cache key will be suffixed

5
docs/internals/deprecation.txt
View File

@ -114,7 +114,7 @@ these changes.
no longer appears to be actively maintained & does not work on Python 3.
You are advised to install `Pillow`_, which should be used instead.
.. _`Pillow`: https://pypi.python.org/pypi/Pillow
.. _`Pillow`: https://pypi.python.org/pypi/Pillow
* The following private APIs will be removed:
@ -215,6 +215,9 @@ these changes.
* The internal ``django.utils.functional.memoize`` will be removed.
* ``django.core.cache.get_cache`` will be removed. Add suitable entries
to :setting:`CACHES` and use :data:`django.core.cache.caches` instead.
2.0
---

18
docs/releases/1.7.txt
View File

@ -269,6 +269,18 @@ Minor features
allowing the ``published`` element to be included in the feed (which
relies on ``pubdate``).
Cache
^^^^^
* Access to caches configured in :setting:`CACHES` is now available via
:data:`django.core.cache.caches`. This dict-like object provides a different
instance per thread. It supersedes :func:`django.core.cache.get_cache` which
is now deprecated.
* If you instanciate cache backends directly, be aware that they aren't
thread-safe any more, as :data:`django.core.cache.caches` now yields
differend instances per thread.
Email
^^^^^
@ -643,6 +655,12 @@ Miscellaneous
Features deprecated in 1.7
==========================
``django.core.cache.get_cache``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:func:`django.core.cache.get_cache` has been supplanted by
:data:`django.core.cache.caches`.
``django.utils.dictconfig``/``django.utils.importlib``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

52
docs/topics/cache.txt
View File

@ -703,22 +703,50 @@ pickling.)
Accessing the cache
-------------------
.. data:: django.core.cache.caches
.. versionadded:: 1.7
You can access the caches configured in the :setting:`CACHES` setting
through a dict-like object: ``django.core.cache.caches``. Repeated
requests for the same alias in the same thread will return the same
object.
>>> from django.core.cache import caches
>>> cache1 = caches['myalias']
>>> cache2 = caches['myalias']
>>> cache1 is cache2
True
If the named key does not exist, ``InvalidCacheBackendError`` will be
raised.
To provide thread-safety, a different instance of the cache backend will
be returned for each thread.
.. data:: django.core.cache.cache
As a shortcut, the default cache is available as
``django.core.cache.cache``::
>>> from django.core.cache import cache
This object is equivalent to ``caches['default']``.
.. function:: django.core.cache.get_cache(backend, **kwargs)
The cache module, ``django.core.cache``, has a ``cache`` object that's
automatically created from the ``'default'`` entry in the :setting:`CACHES`
setting::
.. deprecated:: 1.7
This function has been deprecated in favour of
:data:`~django.core.cache.caches`.
>>> from django.core.cache import cache
If you have multiple caches defined in :setting:`CACHES`, then you can use
:func:`django.core.cache.get_cache` to retrieve a cache object for any key::
>>> from django.core.cache import get_cache
>>> cache = get_cache('alternate')
If the named key does not exist, ``InvalidCacheBackendError`` will be raised.
Before Django 1.7 this function was the canonical way to obtain a cache
instance. It could also be used to create a new cache instance with a
different configuration.
>>> from django.core.cache import get_cache
>>> get_cache('default')
>>> get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION='127.0.0.2')
>>> get_cache('default', TIMEOUT=300)
Basic usage
-----------

1058
tests/cache/tests.py vendored
View File

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2
tests/template_tests/tests.py
View File

@ -514,7 +514,7 @@ class TemplateRegressionTests(TestCase):
o2 = t2.render(ctx)
self.assertEqual(o1, 'foo')
self.assertNotEqual(o1, o2)
self.assertEqual(o2, 'bar')
def test_cache_missing_backend(self):
"""