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Fixed #11675 -- Added support for the PyLibMC cache library. In order to support this, and clean up some other 1.3 caching additions, this patch also includes some changes to the way caches are defined. This means you can now have multiple caches, in the same way you have multiple databases. A huge thanks to Jacob Burch for the work on the PyLibMC backend, and to Jannis for his work on the cache definition changes. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@15005 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Russell Keith-Magee 2010-12-21 15:19:19 +00:00
parent 3cf8502d35
commit 673e6fc7fb
19 changed files with 739 additions and 247 deletions
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7
django/conf/global_settings.py
View File

@ -431,14 +431,15 @@ SESSION_FILE_PATH = None # Directory to store ses
# CACHE #
#########
# New format
CACHES = {
}
# The cache backend to use. See the docstring in django.core.cache for the
# possible values.
CACHE_BACKEND = 'locmem://'
CACHE_VERSION = 1
CACHE_KEY_PREFIX = ''
CACHE_KEY_FUNCTION = None
CACHE_MIDDLEWARE_KEY_PREFIX = ''
CACHE_MIDDLEWARE_SECONDS = 600
CACHE_MIDDLEWARE_ALIAS = 'default'
####################
# COMMENTS #

13
django/contrib/gis/db/backends/spatialite/creation.py
View File

@ -1,5 +1,7 @@
import os
from django.conf import settings
from django.core.cache import get_cache
from django.core.cache.backends.db import BaseDatabaseCache
from django.core.exceptions import ImproperlyConfigured
from django.core.management import call_command
from django.db.backends.sqlite3.creation import DatabaseCreation
@ -28,11 +30,12 @@ class SpatiaLiteCreation(DatabaseCreation):
self.load_spatialite_sql()
call_command('syncdb', verbosity=verbosity, interactive=False, database=self.connection.alias)
if settings.CACHE_BACKEND.startswith('db://'):
from django.core.cache import parse_backend_uri
_, cache_name, _ = parse_backend_uri(settings.CACHE_BACKEND)
call_command('createcachetable', cache_name)
for cache_alias in settings.CACHES:
cache = get_cache(cache_alias)
if isinstance(cache, BaseDatabaseCache):
from django.db import router
if router.allow_syncdb(self.connection.alias, cache.cache_model_class):
call_command('createcachetable', cache._table, database=self.connection.alias)
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database.
cursor = self.connection.cursor()

124
django/core/cache/__init__.py vendored
View File

@ -12,8 +12,13 @@ get_cache() function made available here. get_cache() takes a backend URI
(e.g. "memcached://127.0.0.1:11211/") and returns an instance of a backend
cache class.
See docs/cache.txt for information on the public API.
See docs/topics/cache.txt for information on the public API.
"""
from django.conf import settings
from django.core import signals
from django.core.cache.backends.base import (
InvalidCacheBackendError, CacheKeyWarning, BaseCache)
from django.utils import importlib
try:
# The mod_python version is more efficient, so try importing it first.
@ -27,10 +32,9 @@ except ImportError:
# PendingDeprecationWarning
from cgi import parse_qsl
from django.conf import settings
from django.core import signals
from django.core.cache.backends.base import InvalidCacheBackendError, CacheKeyWarning
from django.utils import importlib
__all__ = [
'get_cache', 'cache', 'DEFAULT_CACHE_ALIAS'
]
# Name for use in settings file --> name of module in "backends" directory.
# Any backend scheme that is not in this dictionary is treated as a Python
@ -43,6 +47,8 @@ BACKENDS = {
'dummy': 'dummy',
}
DEFAULT_CACHE_ALIAS = 'default'
def parse_backend_uri(backend_uri):
"""
Converts the "backend_uri" into a cache scheme ('db', 'memcached', etc), a
@ -67,32 +73,102 @@ def parse_backend_uri(backend_uri):
return scheme, host, params
def get_cache(backend_uri, key_prefix=None, version=None, key_func=None):
if key_prefix is None:
key_prefix = settings.CACHE_KEY_PREFIX
if version is None:
version = settings.CACHE_VERSION
if key_func is None:
key_func = settings.CACHE_KEY_FUNCTION
if not settings.CACHES:
import warnings
warnings.warn(
"settings.CACHE_* is deprecated; use settings.CACHES instead.",
PendingDeprecationWarning
)
# Mapping for new-style cache backend api
backend_classes = {
'memcached': 'memcached.CacheClass',
'locmem': 'locmem.LocMemCache',
'file': 'filebased.FileBasedCache',
'db': 'db.DatabaseCache',
'dummy': 'dummy.DummyCache',
}
engine, host, params = parse_backend_uri(settings.CACHE_BACKEND)
if engine in backend_classes:
engine = 'django.core.cache.backends.%s' % backend_classes[engine]
defaults = {
'BACKEND': engine,
'LOCATION': host,
}
defaults.update(params)
settings.CACHES[DEFAULT_CACHE_ALIAS] = defaults
if key_func is not None and not callable(key_func):
key_func_module_path, key_func_name = key_func.rsplit('.', 1)
key_func_module = importlib.import_module(key_func_module_path)
key_func = getattr(key_func_module, key_func_name)
if DEFAULT_CACHE_ALIAS not in settings.CACHES:
raise ImproperlyConfigured("You must define a '%s' cache" % DEFAULT_CACHE_ALIAS)
scheme, host, params = parse_backend_uri(backend_uri)
if scheme in BACKENDS:
name = 'django.core.cache.backends.%s' % BACKENDS[scheme]
def parse_backend_conf(backend, **kwargs):
"""
Helper function to parse the backend configuration
that doesn't use the URI notation.
"""
# Try to get the CACHES entry for the given backend name first
conf = settings.CACHES.get(backend, None)
if conf is not None:
args = conf.copy()
backend = args.pop('BACKEND')
location = args.pop('LOCATION', '')
return backend, location, args
else:
name = scheme
module = importlib.import_module(name)
return module.CacheClass(host, params, key_prefix=key_prefix, version=version, key_func=key_func)
# Trying to import the given backend, in case it's a dotted path
mod_path, cls_name = backend.rsplit('.', 1)
try:
mod = importlib.import_module(mod_path)
backend_cls = getattr(mod, cls_name)
except (AttributeError, ImportError):
raise InvalidCacheBackendError("Could not find backend '%s'" % backend)
location = kwargs.pop('LOCATION', '')
return backend, location, kwargs
raise InvalidCacheBackendError(
"Couldn't find a cache backend named '%s'" % backend)
cache = get_cache(settings.CACHE_BACKEND)
def get_cache(backend, **kwargs):
"""
Function to load a cache backend dynamically. This is flexible by design
to allow different use cases:
To load a backend with the old URI-based notation::
cache = get_cache('locmem://')
To load a backend that is pre-defined in the settings::
cache = get_cache('default')
To load a backend with its dotted import path,
including arbitrary options::
cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', **{
'LOCATION': '127.0.0.1:11211', 'TIMEOUT': 30,
})
"""
try:
if '://' in backend:
# for backwards compatibility
backend, location, params = parse_backend_uri(backend)
if backend in BACKENDS:
backend = 'django.core.cache.backends.%s' % BACKENDS[backend]
params.update(kwargs)
mod = importlib.import_module(backend)
backend_cls = mod.CacheClass
else:
backend, location, params = parse_backend_conf(backend, **kwargs)
mod_path, cls_name = backend.rsplit('.', 1)
mod = importlib.import_module(mod_path)
backend_cls = getattr(mod, cls_name)
except (AttributeError, ImportError), e:
raise InvalidCacheBackendError(
"Could not find backend '%s': %s" % (backend, e))
return backend_cls(location, params)
cache = get_cache(DEFAULT_CACHE_ALIAS)
# Some caches -- python-memcached in particular -- need to do a cleanup at the
# end of a request cycle. If the cache provides a close() method, wire it up
# here.
if hasattr(cache, 'close'):
signals.request_finished.connect(cache.close)

37
django/core/cache/backends/base.py vendored
View File

@ -2,8 +2,10 @@
import warnings
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured, DjangoRuntimeWarning
from django.utils.encoding import smart_str
from django.utils.importlib import import_module
class InvalidCacheBackendError(ImproperlyConfigured):
pass
@ -15,38 +17,55 @@ class CacheKeyWarning(DjangoRuntimeWarning):
MEMCACHE_MAX_KEY_LENGTH = 250
def default_key_func(key, key_prefix, version):
"""Default function to generate keys.
"""
Default function to generate keys.
Constructs the key used by all other methods. By default it prepends
the `key_prefix'. CACHE_KEY_FUNCTION can be used to specify an alternate
the `key_prefix'. KEY_FUNCTION can be used to specify an alternate
function with custom key making behavior.
"""
return ':'.join([key_prefix, str(version), smart_str(key)])
def get_key_func(key_func):
"""
Function to decide which key function to use.
Defaults to ``default_key_func``.
"""
if key_func is not None:
if callable(key_func):
return key_func
else:
key_func_module_path, key_func_name = key_func.rsplit('.', 1)
key_func_module = import_module(key_func_module_path)
return getattr(key_func_module, key_func_name)
return default_key_func
class BaseCache(object):
def __init__(self, params, key_prefix='', version=1, key_func=None):
timeout = params.get('timeout', 300)
def __init__(self, params):
timeout = params.get('timeout', params.get('TIMEOUT', 300))
try:
timeout = int(timeout)
except (ValueError, TypeError):
timeout = 300
self.default_timeout = timeout
max_entries = params.get('max_entries', 300)
options = params.get('OPTIONS', {})
max_entries = params.get('max_entries', options.get('MAX_ENTRIES', 300))
try:
self._max_entries = int(max_entries)
except (ValueError, TypeError):
self._max_entries = 300
cull_frequency = params.get('cull_frequency', 3)
cull_frequency = params.get('cull_frequency', options.get('CULL_FREQUENCY', 3))
try:
self._cull_frequency = int(cull_frequency)
except (ValueError, TypeError):
self._cull_frequency = 3
self.key_prefix = smart_str(key_prefix)
self.version = version
self.key_func = key_func or default_key_func
self.key_prefix = smart_str(params.get('KEY_PREFIX', ''))
self.version = params.get('VERSION', 1)
self.key_func = get_key_func(params.get('KEY_FUNCTION', None))
def make_key(self, key, version=None):
"""Constructs the key used by all other methods. By default it

12
django/core/cache/backends/db.py vendored
View File

@ -25,16 +25,16 @@ class Options(object):
self.managed = True
self.proxy = False
class BaseDatabaseCacheClass(BaseCache):
def __init__(self, table, params, key_prefix='', version=1, key_func=None):
BaseCache.__init__(self, params, key_prefix, version, key_func)
class BaseDatabaseCache(BaseCache):
def __init__(self, table, params):
BaseCache.__init__(self, params)
self._table = table
class CacheEntry(object):
_meta = Options(table)
self.cache_model_class = CacheEntry
class CacheClass(BaseDatabaseCacheClass):
class DatabaseCache(BaseDatabaseCache):
def get(self, key, default=None, version=None):
key = self.make_key(key, version=version)
self.validate_key(key)
@ -140,3 +140,7 @@ class CacheClass(BaseDatabaseCacheClass):
table = connections[db].ops.quote_name(self._table)
cursor = connections[db].cursor()
cursor.execute('DELETE FROM %s' % table)
# For backwards compatibility
class CacheClass(DatabaseCache):
pass

6
django/core/cache/backends/dummy.py vendored
View File

@ -2,7 +2,7 @@
from django.core.cache.backends.base import BaseCache
class CacheClass(BaseCache):
class DummyCache(BaseCache):
def __init__(self, host, *args, **kwargs):
BaseCache.__init__(self, *args, **kwargs)
@ -40,3 +40,7 @@ class CacheClass(BaseCache):
def clear(self):
pass
# For backwards compatibility
class CacheClass(DummyCache):
pass

10
django/core/cache/backends/filebased.py vendored
View File

@ -11,9 +11,9 @@ except ImportError:
from django.core.cache.backends.base import BaseCache
from django.utils.hashcompat import md5_constructor
class CacheClass(BaseCache):
def __init__(self, dir, params, key_prefix='', version=1, key_func=None):
BaseCache.__init__(self, params, key_prefix, version, key_func)
class FileBasedCache(BaseCache):
def __init__(self, dir, params):
BaseCache.__init__(self, params)
self._dir = dir
if not os.path.exists(self._dir):
self._createdir()
@ -161,3 +161,7 @@ class CacheClass(BaseCache):
shutil.rmtree(self._dir)
except (IOError, OSError):
pass
# For backwards compatibility
class CacheClass(FileBasedCache):
pass

23
django/core/cache/backends/locmem.py vendored
View File

@ -9,12 +9,19 @@ except ImportError:
from django.core.cache.backends.base import BaseCache
from django.utils.synch import RWLock
class CacheClass(BaseCache):
def __init__(self, _, params, key_prefix='', version=1, key_func=None):
BaseCache.__init__(self, params, key_prefix, version, key_func)
self._cache = {}
self._expire_info = {}
self._lock = RWLock()
# Global in-memory store of cache data. Keyed by name, to provide
# multiple named local memory caches.
_caches = {}
_expire_info = {}
_locks = {}
class LocMemCache(BaseCache):
def __init__(self, name, params):
BaseCache.__init__(self, params)
global _caches, _expire_info, _locks
self._cache = _caches.setdefault(name, {})
self._expire_info = _expire_info.setdefault(name, {})
self._lock = _locks.setdefault(name, RWLock())
def add(self, key, value, timeout=None, version=None):
key = self.make_key(key, version=version)
@ -133,3 +140,7 @@ class CacheClass(BaseCache):
def clear(self):
self._cache.clear()
self._expire_info.clear()
# For backwards compatibility
class CacheClass(LocMemCache):
pass

113
django/core/cache/backends/memcached.py vendored
View File

@ -1,26 +1,34 @@
"Memcached cache backend"
import time
from threading import local
from django.core.cache.backends.base import BaseCache, InvalidCacheBackendError
from django.utils import importlib
try:
import cmemcache as memcache
import warnings
warnings.warn(
"Support for the 'cmemcache' library has been deprecated. Please use python-memcached instead.",
DeprecationWarning
)
except ImportError:
try:
import memcache
except:
raise InvalidCacheBackendError("Memcached cache backend requires either the 'memcache' or 'cmemcache' library")
class BaseMemcachedCache(BaseCache):
def __init__(self, server, params, library, value_not_found_exception):
super(BaseMemcachedCache, self).__init__(params)
if isinstance(server, basestring):
self._servers = server.split(';')
else:
self._servers = server
class CacheClass(BaseCache):
def __init__(self, server, params, key_prefix='', version=1, key_func=None):
BaseCache.__init__(self, params, key_prefix, version, key_func)
self._cache = memcache.Client(server.split(';'))
# The exception type to catch from the underlying library for a key
# that was not found. This is a ValueError for python-memcache,
# pylibmc.NotFound for pylibmc, and cmemcache will return None without
# raising an exception.
self.LibraryValueNotFoundException = value_not_found_exception
self._lib = library
self._options = params.get('OPTIONS', None)
@property
def _cache(self):
"""
Implements transparent thread-safe access to a memcached client.
"""
return self._lib.Client(self._servers)
def _get_memcache_timeout(self, timeout):
"""
@ -79,13 +87,13 @@ class CacheClass(BaseCache):
val = self._cache.incr(key, delta)
# python-memcache responds to incr on non-existent keys by
# raising a ValueError. Cmemcache returns None. In both
# cases, we should raise a ValueError though.
except ValueError:
# raising a ValueError, pylibmc by raising a pylibmc.NotFound
# and Cmemcache returns None. In all cases,
# we should raise a ValueError though.
except self.LibraryValueNotFoundException:
val = None
if val is None:
raise ValueError("Key '%s' not found" % key)
return val
def decr(self, key, delta=1, version=None):
@ -93,10 +101,11 @@ class CacheClass(BaseCache):
try:
val = self._cache.decr(key, delta)
# python-memcache responds to decr on non-existent keys by
# raising a ValueError. Cmemcache returns None. In both
# cases, we should raise a ValueError though.
except ValueError:
# python-memcache responds to incr on non-existent keys by
# raising a ValueError, pylibmc by raising a pylibmc.NotFound
# and Cmemcache returns None. In all cases,
# we should raise a ValueError though.
except self.LibraryValueNotFoundException:
val = None
if val is None:
raise ValueError("Key '%s' not found" % key)
@ -117,3 +126,59 @@ class CacheClass(BaseCache):
def clear(self):
self._cache.flush_all()
# For backwards compatibility -- the default cache class tries a
# cascading lookup of cmemcache, then memcache.
class CacheClass(BaseMemcachedCache):
def __init__(self, server, params):
try:
import cmemcache as memcache
import warnings
warnings.warn(
"Support for the 'cmemcache' library has been deprecated. Please use python-memcached or pyblimc instead.",
DeprecationWarning
)
except ImportError:
try:
import memcache
except:
raise InvalidCacheBackendError(
"Memcached cache backend requires either the 'memcache' or 'cmemcache' library"
)
super(CacheClass, self).__init__(server, params,
library=memcache,
value_not_found_exception=ValueError)
class MemcachedCache(BaseMemcachedCache):
"An implementation of a cache binding using python-memcached"
def __init__(self, server, params):
import memcache
super(MemcachedCache, self).__init__(server, params,
library=memcache,
value_not_found_exception=ValueError)
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
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

14
django/db/backends/creation.py
View File

@ -359,12 +359,14 @@ class BaseDatabaseCreation(object):
# (unless you really ask to be flooded)
call_command('syncdb', verbosity=max(verbosity - 1, 0), interactive=False, database=self.connection.alias)
if settings.CACHE_BACKEND.startswith('db://'):
from django.core.cache import parse_backend_uri, cache
from django.db import router
if router.allow_syncdb(self.connection.alias, cache.cache_model_class):
_, cache_name, _ = parse_backend_uri(settings.CACHE_BACKEND)
call_command('createcachetable', cache_name, database=self.connection.alias)
from django.core.cache import get_cache
from django.core.cache.backends.db import BaseDatabaseCache
for cache_alias in settings.CACHES:
cache = get_cache(cache_alias)
if isinstance(cache, BaseDatabaseCache):
from django.db import router
if router.allow_syncdb(self.connection.alias, cache.cache_model_class):
call_command('createcachetable', cache._table, database=self.connection.alias)
# Get a cursor (even though we don't need one yet). This has
# the side effect of initializing the test database.

37
django/middleware/cache.py
View File

@ -49,7 +49,7 @@ More details about how the caching works:
"""
from django.conf import settings
from django.core.cache import cache
from django.core.cache import get_cache, DEFAULT_CACHE_ALIAS
from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age
class UpdateCacheMiddleware(object):
@ -65,6 +65,7 @@ class UpdateCacheMiddleware(object):
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self.cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
def process_response(self, request, response):
"""Sets the cache, if needed."""
@ -85,7 +86,7 @@ class UpdateCacheMiddleware(object):
patch_response_headers(response, timeout)
if timeout:
cache_key = learn_cache_key(request, response, timeout, self.key_prefix)
cache.set(cache_key, response, timeout)
self.cache.set(cache_key, response, timeout)
return response
class FetchFromCacheMiddleware(object):
@ -100,6 +101,7 @@ class FetchFromCacheMiddleware(object):
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
self.cache = get_cache(settings.CACHE_MIDDLEWARE_ALIAS)
def process_request(self, request):
"""
@ -124,12 +126,12 @@ class FetchFromCacheMiddleware(object):
request._cache_update_cache = True
return None # No cache information available, need to rebuild.
response = cache.get(cache_key, None)
response = self.cache.get(cache_key, None)
# if it wasn't found and we are looking for a HEAD, try looking just for that
if response is None and request.method == 'HEAD':
cache_key = get_cache_key(request, self.key_prefix, 'HEAD')
response = cache.get(cache_key, None)
response = self.cache.get(cache_key, None)
if response is None:
request._cache_update_cache = True
@ -146,14 +148,33 @@ class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
Also used as the hook point for the cache decorator, which is generated
using the decorator-from-middleware utility.
"""
def __init__(self, cache_timeout=None, key_prefix=None, cache_anonymous_only=None):
def __init__(self, cache_timeout=None, cache_anonymous_only=None, **kwargs):
self.cache_timeout = cache_timeout
if cache_timeout is None:
self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
self.key_prefix = key_prefix
if key_prefix is None:
self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
# We need to differentiate between "provided, but using default value",
# and "not provided". If the value is provided using a default, then
# we fall back to system defaults. If it is not provided at all,
# we need to use middleware defaults.
try:
cache_alias = kwargs.get('cache_alias')
if cache_alias is None:
cache_alias = DEFAULT_CACHE_ALIAS
except KeyError:
cache_alias = settings.CACHE_MIDDLEWARE_ALIAS
cache_kwargs = {}
try:
key_prefix = kwargs.get('key_prefix')
if key_prefix is not None:
cache_kwargs['KEY_PREFIX'] = key_prefix
except KeyError:
cache_kwargs['KEY_PREFIX'] = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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
self.cache = get_cache(cache_alias, **cache_kwargs)

13
django/views/decorators/cache.py
View File

@ -40,23 +40,24 @@ def cache_page(*args, **kwargs):
# We also add some asserts to give better error messages in case people are
# using other ways to call cache_page that no longer work.
cache_alias = kwargs.pop('cache', None)
key_prefix = kwargs.pop('key_prefix', None)
assert not kwargs, "The only keyword argument accepted is key_prefix"
assert not kwargs, "The only keyword arguments are cache and key_prefix"
if len(args) > 1:
assert len(args) == 2, "cache_page accepts at most 2 arguments"
if callable(args[0]):
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[1], key_prefix=key_prefix)(args[0])
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[1], cache_alias=cache_alias, key_prefix=key_prefix)(args[0])
elif callable(args[1]):
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[0], key_prefix=key_prefix)(args[1])
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[0], cache_alias=cache_alias, key_prefix=key_prefix)(args[1])
else:
assert False, "cache_page must be passed a view function if called with two arguments"
elif len(args) == 1:
if callable(args[0]):
return decorator_from_middleware_with_args(CacheMiddleware)(key_prefix=key_prefix)(args[0])
return decorator_from_middleware_with_args(CacheMiddleware)(cache_alias=cache_alias, key_prefix=key_prefix)(args[0])
else:
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[0], key_prefix=key_prefix)
return decorator_from_middleware_with_args(CacheMiddleware)(cache_timeout=args[0], cache_alias=cache_alias, key_prefix=key_prefix)
else:
return decorator_from_middleware_with_args(CacheMiddleware)(key_prefix=key_prefix)
return decorator_from_middleware_with_args(CacheMiddleware)(cache_alias=cache_alias, key_prefix=key_prefix)
def cache_control(**kwargs):

2
docs/internals/contributing.txt
View File

@ -940,7 +940,7 @@ dependencies:
* gettext_ (:ref:`gettext_on_windows`)
If you want to test the memcached cache backend, you will also need to define
a :setting:`CACHE_BACKEND` setting that points at your memcached instance.
a :setting:`CACHES` setting that points at your memcached instance.
Each of these dependencies is optional. If you're missing any of them, the
associated tests will be skipped.

150
docs/ref/settings.txt
View File

@ -127,21 +127,63 @@ Default: Not defined
The site-specific user profile model used by this site. See
:ref:`auth-profiles`.
.. setting:: CACHE_BACKEND
.. setting:: CACHES
CACHE_BACKEND
-------------
CACHES
------
Default: ``'locmem://'``
.. versionadded:: 1.3
The cache backend to use. See :doc:`/topics/cache`.
Default::
.. setting:: CACHE_KEY_FUNCTION
{
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
}
}
CACHE_KEY_FUNCTION
------------------
A dictionary containing the settings for all caches to be used with
Django. It is a nested dictionary whose contents maps cache aliases
to a dictionary containing the options for an individual cache.
Default: ``None``
The :setting:`CACHES` setting must configure a ``default`` cache;
any number of additional caches may also be specified. If you
are using a cache backend other than the local memory cache, or
you need to define multiple caches, other options will be required.
The following cache options are available.
.. setting:: CACHES-BACKEND
BACKEND
~~~~~~~
Default: ``''`` (Empty string)
The cache backend to use. The built-in cache backends are:
* ``'django.core.cache.backends.db.DatabaseCache'``
* ``'django.core.cache.backends.dummy.DummyCache'``
* ``'django.core.cache.backends.filebased.FileBasedCache'``
* ``'django.core.cache.backends.locmem.LocMemCache'``
* ``'django.core.cache.backends.memcached.MemcachedCache'``
* ``'django.core.cache.backends.memcached.PyLibMCCache'``
You can use a cache backend that doesn't ship with Django by setting
:setting:`BACKEND <CACHE-BACKEND>` to a fully-qualified path of a cache
backend class (i.e. ``mypackage.backends.whatever.WhateverCache``).
Writing a whole new cache backend from scratch is left as an exercise
to the reader; see the other backends for examples.
.. note::
Prior to Django 1.3, you could use a URI based version of the backend
name to reference the built-in cache backends (e.g., you could use
``'db://tablename'`` to refer to the database backend). This format has
been deprecated, and will be removed in Django 1.5.
.. setting:: CACHES-KEY_FUNCTION
KEY_FUNCTION
~~~~~~~~~~~~
A string containing a dotted path to a function that defines how to
compose a prefix, version and key into a final cache key. The default
@ -155,10 +197,10 @@ argument signature.
See the :ref:`cache documentation <cache_key_transformation>` for more information.
.. setting:: CACHE_KEY_PREFIX
.. setting:: CACHES-KEY_PREFIX
CACHE_KEY_PREFIX
----------------
KEY_PREFIX
~~~~~~~~~~
Default: ``''`` (Empty string)
@ -167,6 +209,67 @@ all cache keys used by the Django server.
See the :ref:`cache documentation <cache_key_prefixing>` for more information.
.. setting:: CACHES-LOCATION
LOCATION
~~~~~~~~
Default: ``''`` (Empty string)
The location of the cache to use. This might be the directory for a
file system cache, a host and port for a memcache server, or simply an
identifying name for a local memory cache. e.g.::
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
'LOCATION': '/var/tmp/django_cache',
}
}
.. setting:: CACHES-OPTIONS
OPTIONS
~~~~~~~
Default: None
Extra parameters to pass to the cache backend. Available parameters
vary depending on your cache backend.
Some information on available parameters can be found in the
:doc:`Cache Backends </topics/cache>` documentation. For more information,
consult your backend module's own documentation.
.. setting:: CACHES-TIMEOUT
TIMEOUT
~~~~~~~
Default: 300
The number of seconds before a cache entry is considered stale.
.. setting:: CACHES-VERSION
VERSION
~~~~~~~
Default: ``1``
The default version number for cache keys generated by the Django server.
See the :ref:`cache documentation <cache_versioning>` for more information.
.. setting:: CACHE_MIDDLEWARE_ALIAS
CACHE_MIDDLEWARE_ALIAS
----------------------
Default: ``default``
The cache connection to use for the cache middleware.
.. setting:: CACHE_MIDDLEWARE_ANONYMOUS_ONLY
CACHE_MIDDLEWARE_ANONYMOUS_ONLY
@ -206,18 +309,6 @@ The default number of seconds to cache a page when the caching middleware or
See :doc:`/topics/cache`.
.. setting:: CACHE_VERSION
CACHE_VERSION
-------------
Default: ``1``
The default version number for cache keys generated by the Django server.
See the :ref:`cache documentation <cache_versioning>` for more information.
.. setting:: CSRF_COOKIE_DOMAIN
CSRF_COOKIE_DOMAIN
@ -293,7 +384,7 @@ SQLite. This can be configured using the following::
For other database backends, or more complex SQLite configurations, other options
will be required. The following inner options are available.
.. setting:: ENGINE
.. setting:: DATABASE-ENGINE
ENGINE
~~~~~~
@ -1896,6 +1987,15 @@ See :tfilter:`allowed date format strings <date>`. See also ``DATE_FORMAT``,
Deprecated settings
===================
.. setting:: CACHE_BACKEND
CACHE_BACKEND
-------------
.. deprecated:: 1.3
This setting has been replaced by :setting:`BACKEND <CACHES-BACKEND>` in
:setting:`CACHES`.
.. setting:: DATABASE_ENGINE
DATABASE_ENGINE

27
docs/releases/1.3.txt
View File

@ -154,6 +154,29 @@ it is needed, later in the response process.
For more details, see the :ref:`documentation </ref/template-response>`
on the :class:`~django.template.TemplateResponse` class.
Caching changes
~~~~~~~~~~~~~~~
Django 1.3 sees the introduction of several improvements to the
Django's caching infrastructure.
Firstly, Django now supports multiple named caches. In the same way
that Django 1.2 introduced support for multiple database connections,
Django 1.3 allows you to use the new :setting:`CACHES` setting to
define multiple named cache connections.
Secondly, :ref:`Versioning <cache_versioning>`, :ref:`site-wide
prefixing <cache_key_prefixing>` and :ref:`transformation
<cache_key_transformation>` has been added to the cache API.
Lastly, support for pylibmc_ has been added to the memcached cache
backend.
For more details, see the :ref:`documentation on
caching in Django<topics/cache>`.
.. _pylibmc: http://sendapatch.se/projects/pylibmc/
Everything else
~~~~~~~~~~~~~~~
@ -176,10 +199,6 @@ requests. These include:
:meth:`~django.test.client.Client.assertNumQueries` -- making it
easier to test the database activity associated with a view.
* :ref:`Versioning <cache_versioning>`, :ref:`site-wide prefixing
<cache_key_prefixing>` and :ref:`transformation
<cache_key_transformation>` has been added to the cache API.
* Support for lookups spanning relations in admin's ``list_filter``.
* Support for _HTTPOnly cookies.

283
docs/topics/cache.txt
View File

@ -47,9 +47,16 @@ where your cached data should live -- whether in a database, on the filesystem
or directly in memory. This is an important decision that affects your cache's
performance; yes, some cache types are faster than others.
Your cache preference goes in the :setting:`CACHE_BACKEND` setting in your
Your cache preference goes in the :setting:`CACHES` setting in your
settings file. Here's an explanation of all available values for
:setting:`CACHE_BACKEND`.
:setting:`CACHES`.
.. versionchanged:: 1.3
The settings used to configure caching changed in Django 1.3. In
Django 1.2 and earlier, you used a single string-based
:setting:`CACHE_BACKEND` setting to configure caches. This has
been replaced with the new dictionary-based :setting:`CACHES`
setting.
Memcached
---------
@ -66,9 +73,12 @@ fast interface for adding, retrieving and deleting arbitrary data in the cache.
All data is stored directly in memory, so there's no overhead of database or
filesystem usage.
After installing Memcached itself, you'll need to install
``python-memcached``, which provides Python bindings to Memcached.
This is available at ftp://ftp.tummy.com/pub/python-memcached/
After installing Memcached itself, you'll need to install a memcached
binding. There are several python memcached bindings available; the
two most common are `python-memcached`_ and `pylibmc`_.
.. _`python-memcached`: ftp://ftp.tummy.com/pub/python-memcached/
.. _`pylibmc`: http://sendapatch.se/projects/pylibmc/
.. versionchanged:: 1.2
In Django 1.0 and 1.1, you could also use ``cmemcache`` as a binding.
@ -76,31 +86,64 @@ This is available at ftp://ftp.tummy.com/pub/python-memcached/
a lack of maintenance on the ``cmemcache`` library itself. Support for
``cmemcache`` will be removed completely in Django 1.4.
To use Memcached with Django, set :setting:`CACHE_BACKEND` to
``memcached://ip:port/``, where ``ip`` is the IP address of the Memcached
daemon and ``port`` is the port on which Memcached is running.
.. versionchanged:: 1.3
Support for ``pylibmc`` was added.
In this example, Memcached is running on localhost (127.0.0.1) port 11211::
To use Memcached with Django:
CACHE_BACKEND = 'memcached://127.0.0.1:11211/'
* Set :setting:`BACKEND <CACHES-BACKEND>` to
``django.core.cache.backends.memcached.MemcachedCache`` or
``django.core.cache.backends.memcached.PyLibMCCache`` (depending
on your chosen memcached binding)
* Set :setting:`LOCATION <CACHES-LOCATION>` to ``ip:port`` values,
where ``ip`` is the IP address of the Memcached daemon and
``port`` is the port on which Memcached is running.
In this example, Memcached is running on localhost (127.0.0.1) port 11211, using
the ``python-memcached`` binding::
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': '127.0.0.1:11211',
}
}
One excellent feature of Memcached is its ability to share cache over multiple
servers. This means you can run Memcached daemons on multiple machines, and the
program will treat the group of machines as a *single* cache, without the need
to duplicate cache values on each machine. To take advantage of this feature,
include all server addresses in :setting:`CACHE_BACKEND`, separated by
semicolons.
include all server addresses in :setting:`BACKEND <CACHES-BACKEND>`, either
separated by semicolons or as a list.
In this example, the cache is shared over Memcached instances running on IP
address 172.19.26.240 and 172.19.26.242, both on port 11211::
CACHE_BACKEND = 'memcached://172.19.26.240:11211;172.19.26.242:11211/'
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': [
'172.19.26.240:11211',
'172.19.26.242:11211',
]
}
}
In the following example, the cache is shared over Memcached instances running
on the IP addresses 172.19.26.240 (port 11211), 172.19.26.242 (port 11212), and
172.19.26.244 (port 11213)::
CACHE_BACKEND = 'memcached://172.19.26.240:11211;172.19.26.242:11212;172.19.26.244:11213/'
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.memcached.MemcachedCache',
'LOCATION': [
'172.19.26.240:11211',
'172.19.26.242:11211',
'172.19.26.244:11213',
]
}
}
A final point about Memcached is that memory-based caching has one
disadvantage: Because the cached data is stored in memory, the data will be
@ -125,12 +168,19 @@ not already being used in your database.) This command creates a single table
in your database that is in the proper format that Django's database-cache
system expects.
Once you've created that database table, set your :setting:`CACHE_BACKEND`
setting to ``"db://tablename"``, where ``tablename`` is the name of the
database table. In this example, the cache table's name is
``my_cache_table``::
Once you've created that database table, set your
:setting:`BACKEND <CACHES-BACKEND>` setting to
``"django.core.cache.backends.db.DatabaseCache"``, and
:setting:`LOCATION <CACHES-LOCATION>` to ``tablename`` -- the name of the
database table. In this example, the cache table's name is ``my_cache_table``::
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
'LOCATION': 'my_cache_table',
}
}
CACHE_BACKEND = 'db://my_cache_table'
The database caching backend uses the same database as specified in your
settings file. You can't use a different database backend for your cache table.
@ -183,18 +233,28 @@ model.
Filesystem caching
------------------
To store cached items on a filesystem, use the ``"file://"`` cache type for
:setting:`CACHE_BACKEND`. For example, to store cached data in
To store cached items on a filesystem, use
``"django.core.cache.backends.filebased.FileBasedCache"`` for
:setting:`BACKEND <CACHES-BACKEND>`. For example, to store cached data in
``/var/tmp/django_cache``, use this setting::
CACHE_BACKEND = 'file:///var/tmp/django_cache'
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
'LOCATION': '/var/tmp/django_cache',
}
}
Note that there are three forward slashes toward the beginning of that example.
The first two are for ``file://``, and the third is the first character of the
directory path, ``/var/tmp/django_cache``. If you're on Windows, put the
drive letter after the ``file://``, like this::
file://c:/foo/bar
If you're on Windows, put the drive letter at the beginning of the path,
like this::
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
'LOCATION': 'c:/foo/bar',
}
}
The directory path should be absolute -- that is, it should start at the root
of your filesystem. It doesn't matter whether you put a slash at the end of the
@ -215,10 +275,22 @@ Local-memory caching
If you want the speed advantages of in-memory caching but don't have the
capability of running Memcached, consider the local-memory cache backend. This
cache is multi-process and thread-safe. To use it, set :setting:`CACHE_BACKEND`
to ``"locmem://"``. For example::
cache is multi-process and thread-safe. To use it, set
:setting:`BACKEND <CACHES-BACKEND>` to
``"django.core.cache.backends.locmem.LocMemCache"``. For example::
CACHE_BACKEND = 'locmem://'
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
'LOCATION': 'unique-snowflake'
}
}
The cache :setting:`LOCATION <CACHES-LOCATION>` is used to identify individual
memory stores. If you only have one locmem cache, you can omit the
:setting:`LOCATION <CACHES-LOCATION>`; however, if you have more that one local
memory cache, you will need to assign a name to at least one of them in
order to keep them separate.
Note that each process will have its own private cache instance, which means no
cross-process caching is possible. This obviously also means the local memory
@ -234,9 +306,13 @@ just implements the cache interface without doing anything.
This is useful if you have a production site that uses heavy-duty caching in
various places but a development/test environment where you don't want to cache
and don't want to have to change your code to special-case the latter. To
activate dummy caching, set :setting:`CACHE_BACKEND` like so::
activate dummy caching, set :setting:`BACKEND <CACHES-BACKEND>` like so::
CACHE_BACKEND = 'dummy://'
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.dummy.DummyCache',
}
}
Using a custom cache backend
----------------------------
@ -245,10 +321,14 @@ Using a custom cache backend
While Django includes support for a number of cache backends out-of-the-box,
sometimes you might want to use a customized cache backend. To use an external
cache backend with Django, use a Python import path as the scheme portion (the
part before the initial colon) of the :setting:`CACHE_BACKEND` URI, like so::
cache backend with Django, use the Python import path as the
:setting:`BACKEND <CACHES-BACKEND>` of the :setting:`CACHES` setting, like so::
CACHE_BACKEND = 'path.to.backend://'
CACHES = {
'default': {
'BACKEND': 'path.to.backend',
}
}
If you're building your own backend, you can use the standard cache backends
as reference implementations. You'll find the code in the
@ -258,35 +338,77 @@ Note: Without a really compelling reason, such as a host that doesn't support
them, you should stick to the cache backends included with Django. They've
been well-tested and are easy to use.
CACHE_BACKEND arguments
-----------------------
Cache arguments
---------------
Each cache backend may take arguments. They're given in query-string style on
the :setting:`CACHE_BACKEND` setting. Valid arguments are as follows:
In addition to the defining the engine and name of the each cache
backend, each cache backend can be given additional arguments to
control caching behavior. These arguments are provided as additional
keys in the :setting:`CACHES` setting. Valid arguments are as follows:
* ``timeout``: The default timeout, in seconds, to use for the cache.
This argument defaults to 300 seconds (5 minutes).
* :setting:`TIMEOUT <CACHES-TIMEOUT>`: The default timeout, in
seconds, to use for the cache. This argument defaults to 300
seconds (5 minutes).
* ``max_entries``: For the ``locmem``, ``filesystem`` and ``database``
backends, the maximum number of entries allowed in the cache before old
values are deleted. This argument defaults to 300.
* :setting:`OPTIONS <CACHES-OPTIONS>`: Any options that should be
passed to cache backend. The list options understood by each
backend vary with each backend.
* ``cull_frequency``: The fraction of entries that are culled when
``max_entries`` is reached. The actual ratio is ``1/cull_frequency``, so
set ``cull_frequency=2`` to cull half of the entries when ``max_entries``
is reached.
Cache backends that implement their own culling strategy (i.e.,
the ``locmem``, ``filesystem`` and ``database`` backends) will
honor the following options:
A value of ``0`` for ``cull_frequency`` means that the entire cache will
be dumped when ``max_entries`` is reached. This makes culling *much*
faster at the expense of more cache misses.
* ``MAX_ENTRIES``: the maximum number of entries allowed in
the cache before old values are deleted. This argument
defaults to ``300``.
In this example, ``timeout`` is set to ``60``::
* ``CULL_FREQUENCY``: The fraction of entries that are culled
when ``MAX_ENTRIES`` is reached. The actual ratio is
``1/CULL_FREQUENCY``, so set ``CULL_FREQUENCY``: to ``2`` to
cull half of the entries when ``MAX_ENTRIES`` is reached.
CACHE_BACKEND = "memcached://127.0.0.1:11211/?timeout=60"
A value of ``0`` for ``CULL_FREQUENCY`` means that the
entire cache will be dumped when ``MAX_ENTRIES`` is reached.
This makes culling *much* faster at the expense of more
cache misses.
In this example, ``timeout`` is ``30`` and ``max_entries`` is ``400``::
Cache backends backed by a third-party library will pass their
options directly to the underlying cache library. As a result,
the list of valid options depends on the library in use.
CACHE_BACKEND = "locmem://?timeout=30&max_entries=400"
* :setting:`KEY_PREFIX <CACHES-KEY_PREFIX>`: A string that will be
automatically included (prepended by default) to all cache keys
used by the Django server.
See the :ref:`cache documentation <cache_key_prefixing>` for
more information.
* :setting:`VERSION <CACHES-VERSION>`: The default version number
for cache keys generated by the Django server.
See the :ref:`cache documentation <cache_versioning>` for more
information.
* :setting:`KEY_FUNCTION <CACHES-KEY_FUNCTION>`
A string containing a dotted path to a function that defines how
to compose a prefix, version and key into a final cache key.
See the :ref:`cache documentation <cache_key_transformation>`
for more information.
In this example, a filesystem backend is being configured with a timeout
of 60 seconds, and a maximum capacity of 1000 items::
CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.filebased.FileCache',
'LOCATION': '127.0.0.1:11211',
'TIMEOUT': 60,
'OPTIONS': {
'MAX_ENTRIES': 1000
}
}
}
Invalid arguments are silently ignored, as are invalid values of known
arguments.
@ -318,6 +440,7 @@ entire site. You'll need to add
Then, add the following required settings to your Django settings file:
* :setting:`CACHE_MIDDLEWARE_ALIAS` -- The cache alias to use for storage.
* :setting:`CACHE_MIDDLEWARE_SECONDS` -- The number of seconds each page should
be cached.
* :setting:`CACHE_MIDDLEWARE_KEY_PREFIX` -- If the cache is shared across
@ -408,7 +531,17 @@ then requests to ``/foo/1/`` and ``/foo/23/`` will be cached separately, as
you may expect. But once a particular URL (e.g., ``/foo/23/``) has been
requested, subsequent requests to that URL will use the cache.
``cache_page`` can also take an optional keyword argument, ``key_prefix``,
``cache_page`` can also take an optional keyword argument, ``cache``,
which directs the decorator to use a specific cache alias when caching view
results. By default, the ``default`` alias will be used, but you can specify
any cache alias you want::
@cache_page(60 * 15, cache="special_cache")
def my_view(request):
...
You can also override the cache prefix on a per-view basis. ``cache_page``
takes an optional keyword argument, ``key_prefix``,
which works in the same way as the :setting:`CACHE_MIDDLEWARE_KEY_PREFIX`
setting for the middleware. It can be used like this::
@ -416,6 +549,10 @@ setting for the middleware. It can be used like this::
def my_view(request):
...
The two settings can also be combined. If you specify a ``cache`` *and*
a ``key_prefix``, you will get all the settings of the requested cache
alias, but with the key_prefix overridden.
Specifying per-view cache in the URLconf
----------------------------------------
@ -535,7 +672,8 @@ can be pickled; refer to the Python documentation for more information about
pickling.)
The cache module, ``django.core.cache``, has a ``cache`` object that's
automatically created from the :setting:`CACHE_BACKEND` setting::
automatically created from the ``'default'`` entry in the :setting:`CACHES`
setting::
>>> from django.core.cache import cache
@ -546,8 +684,9 @@ The basic interface is ``set(key, value, timeout)`` and ``get(key)``::
'hello, world!'
The ``timeout`` argument is optional and defaults to the ``timeout``
argument in the :setting:`CACHE_BACKEND` setting (explained above). It's the
number of seconds the value should be stored in the cache.
argument of the ``'default'`` backend in :setting:`CACHES` setting
(explained above). It's the number of seconds the value should be stored
in the cache.
If the object doesn't exist in the cache, ``cache.get()`` returns ``None``::
@ -665,10 +804,10 @@ diagnose problems.
To prevent this, Django provides the ability to prefix all cache keys
used by a server. When a particular cache key is saved or retrieved,
Django will automatically prefix the cache key with the value of the
:setting:`CACHE_KEY_PREFIX` setting.
:setting:`KEY_PREFIX <CACHES-KEY_PREFIX>` cache setting.
By ensuring each Django instance has a different
:setting:`CACHE_KEY_PREFIX`, you can ensure that there will be no
:setting:`KEY_PREFIX <CACHES-KEY_PREFIX>`, you can ensure that there will be no
collisions in cache values.
.. _cache_versioning:
@ -685,9 +824,9 @@ that are still valid and useful.
Django provides a better way to target individual cache values.
Django's cache framework has a system-wide version identifier,
specified using the :setting:`CACHE_VERSION` setting. The value of
this setting is automatically combined with the cache prefix and the
user-provided cache key to obtain the final cache key.
specified using the :setting:`VERSION <CACHES-VERSION>` cache setting.
The value of this setting is automatically combined with the cache
prefix and the user-provided cache key to obtain the final cache key.
By default, any key request will automatically include the site
default cache key version. However, the primitive cache functions all
@ -739,10 +878,10 @@ If you want to combine the parts in different ways, or apply other
processing to the final key (e.g., taking a hash digest of the key
parts), you can provide a custom key function.
The setting :setting:`CACHE_KEY_FUNCTION` specifies a dotted-path to
a function matching the prototype of :func:`make_key()` above. If
provided, this custom key function will be used instead of the default
key combining function.
The :setting:`KEY_FUNCTION <CACHES-KEY_FUNCTION>` cache setting
specifies a dotted-path to a function matching the prototype of
:func:`make_key()` above. If provided, this custom key function will
be used instead of the default key combining function.
Cache key warnings
------------------
@ -773,15 +912,15 @@ built-in backends, you can subclass it, override just the ``validate_key``
method, and follow the instructions for `using a custom cache backend`_. For
instance, to do this for the ``locmem`` backend, put this code in a module::
from django.core.cache.backends.locmem import CacheClass as LocMemCacheClass
from django.core.cache.backends.locmem import LocMemCache
class CacheClass(LocMemCacheClass):
class CustomLocMemCache(LocMemCache):
def validate_key(self, key):
"""Custom validation, raising exceptions or warnings as needed."""
# ...
...and use the dotted Python path to this module as the scheme portion of your
:setting:`CACHE_BACKEND`.
...and use the dotted Python path to this class in the
:setting:`BACKEND <CACHES-BACKEND>` portion of your :setting:`CACHES` setting.
Upstream caches
===============

4
tests/regressiontests/cache/liberal_backend.py vendored
View File

@ -1,9 +1,9 @@
from django.core.cache.backends.locmem import CacheClass as LocMemCacheClass
from django.core.cache.backends.locmem import LocMemCache
class LiberalKeyValidationMixin(object):
def validate_key(self, key):
pass
class CacheClass(LiberalKeyValidationMixin, LocMemCacheClass):
class CacheClass(LiberalKeyValidationMixin, LocMemCache):
pass

107
tests/regressiontests/cache/tests.py vendored
View File

@ -11,7 +11,7 @@ import warnings
from django.conf import settings
from django.core import management
from django.core.cache import get_cache
from django.core.cache import get_cache, DEFAULT_CACHE_ALIAS
from django.core.cache.backends.base import InvalidCacheBackendError, CacheKeyWarning
from django.http import HttpResponse, HttpRequest
from django.middleware.cache import FetchFromCacheMiddleware, UpdateCacheMiddleware
@ -33,7 +33,7 @@ class DummyCacheTests(unittest.TestCase):
# The Dummy cache backend doesn't really behave like a test backend,
# so it has different test requirements.
def setUp(self):
self.cache = get_cache('dummy://')
self.cache = get_cache('django.core.cache.backends.dummy.DummyCache')
def test_simple(self):
"Dummy cache backend ignores cache set calls"
@ -429,9 +429,6 @@ class BaseCacheTests(object):
self.assertEqual(self.cache.get('answer1', version=2), None)
self.assertEqual(self.v2_cache.get('answer1'), None)
# print '---'
# print 'c1',self.cache._cache
# print 'v2',self.v2_cache._cache
self.assertEqual(self.v2_cache.get('answer1', version=1), 42)
self.assertEqual(self.v2_cache.get('answer1', version=2), None)
@ -704,11 +701,11 @@ class DBCacheTests(unittest.TestCase, BaseCacheTests):
# Spaces are used in the table name to ensure quoting/escaping is working
self._table_name = 'test cache table'
management.call_command('createcachetable', self._table_name, verbosity=0, interactive=False)
self.cache = get_cache('db://%s?max_entries=30' % self._table_name)
self.prefix_cache = get_cache('db://%s' % self._table_name, key_prefix='cacheprefix')
self.v2_cache = get_cache('db://%s' % self._table_name, version=2)
self.custom_key_cache = get_cache('db://%s' % self._table_name, key_func=custom_key_func)
self.custom_key_cache2 = get_cache('db://%s' % self._table_name, key_func='regressiontests.cache.tests.custom_key_func')
self.cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
from django.db import connection
@ -719,16 +716,20 @@ class DBCacheTests(unittest.TestCase, BaseCacheTests):
self.perform_cull_test(50, 29)
def test_zero_cull(self):
self.cache = get_cache('django.core.cache.backends.db.DatabaseCache', LOCATION=self._table_name, OPTIONS={'MAX_ENTRIES': 30, 'CULL_FREQUENCY': 0})
self.perform_cull_test(50, 18)
def test_old_initialization(self):
self.cache = get_cache('db://%s?max_entries=30&cull_frequency=0' % self._table_name)
self.perform_cull_test(50, 18)
class LocMemCacheTests(unittest.TestCase, BaseCacheTests):
def setUp(self):
self.cache = get_cache('locmem://?max_entries=30')
self.prefix_cache = get_cache('locmem://', key_prefix='cacheprefix')
self.v2_cache = get_cache('locmem://', version=2)
self.custom_key_cache = get_cache('locmem://?max_entries=30', key_func=custom_key_func)
self.custom_key_cache2 = get_cache('locmem://?max_entries=30', key_func='regressiontests.cache.tests.custom_key_func')
self.cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30}, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30}, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
# LocMem requires a hack to make the other caches
# share a data store with the 'normal' cache.
@ -744,24 +745,32 @@ class LocMemCacheTests(unittest.TestCase, BaseCacheTests):
self.custom_key_cache2._cache = self.cache._cache
self.custom_key_cache2._expire_info = self.cache._expire_info
def tearDown(self):
self.cache.clear()
def test_cull(self):
self.perform_cull_test(50, 29)
def test_zero_cull(self):
self.cache = get_cache('django.core.cache.backends.locmem.LocMemCache', OPTIONS={'MAX_ENTRIES': 30, 'CULL_FREQUENCY': 0})
self.perform_cull_test(50, 19)
def test_old_initialization(self):
self.cache = get_cache('locmem://?max_entries=30&cull_frequency=0')
self.perform_cull_test(50, 19)
# memcached backend isn't guaranteed to be available.
# To check the memcached backend, the test settings file will
# need to contain a CACHE_BACKEND setting that points at
# need to contain a cache backend setting that points at
# your memcache server.
class MemcachedCacheTests(unittest.TestCase, BaseCacheTests):
def setUp(self):
self.cache = get_cache(settings.CACHE_BACKEND)
self.prefix_cache = get_cache(settings.CACHE_BACKEND, key_prefix='cacheprefix')
self.v2_cache = get_cache(settings.CACHE_BACKEND, version=2)
self.custom_key_cache = get_cache(settings.CACHE_BACKEND, key_func=custom_key_func)
self.custom_key_cache2 = get_cache(settings.CACHE_BACKEND, key_func='regressiontests.cache.tests.custom_key_func')
name = settings.CACHES[DEFAULT_CACHE_ALIAS]['LOCATION']
self.cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name)
self.prefix_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.memcached.MemcachedCache', LOCATION=name, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
self.cache.clear()
@ -781,7 +790,7 @@ class MemcachedCacheTests(unittest.TestCase, BaseCacheTests):
# memcached limits key length to 250
self.assertRaises(Exception, self.cache.set, 'a' * 251, 'value')
MemcachedCacheTests = unittest.skipUnless(settings.CACHE_BACKEND.startswith('memcached://'), "memcached not available")(MemcachedCacheTests)
MemcachedCacheTests = unittest.skipUnless(settings.CACHES[DEFAULT_CACHE_ALIAS]['BACKEND'].startswith('django.core.cache.backends.memcached.'), "memcached not available")(MemcachedCacheTests)
class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
"""
@ -789,11 +798,11 @@ class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
"""
def setUp(self):
self.dirname = tempfile.mkdtemp()
self.cache = get_cache('file://%s?max_entries=30' % self.dirname)
self.prefix_cache = get_cache('file://%s' % self.dirname, key_prefix='cacheprefix')
self.v2_cache = get_cache('file://%s' % self.dirname, version=2)
self.custom_key_cache = get_cache('file://%s' % self.dirname, key_func=custom_key_func)
self.custom_key_cache2 = get_cache('file://%s' % self.dirname, key_func='regressiontests.cache.tests.custom_key_func')
self.cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, OPTIONS={'MAX_ENTRIES': 30})
self.prefix_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_PREFIX='cacheprefix')
self.v2_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, VERSION=2)
self.custom_key_cache = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_FUNCTION=custom_key_func)
self.custom_key_cache2 = get_cache('django.core.cache.backends.filebased.FileBasedCache', LOCATION=self.dirname, KEY_FUNCTION='regressiontests.cache.tests.custom_key_func')
def tearDown(self):
self.cache.clear()
@ -824,6 +833,10 @@ class FileBasedCacheTests(unittest.TestCase, BaseCacheTests):
def test_cull(self):
self.perform_cull_test(50, 29)
def test_old_initialization(self):
self.cache = get_cache('file://%s?max_entries=30' % self.dirname)
self.perform_cull_test(50, 29)
class CustomCacheKeyValidationTests(unittest.TestCase):
"""
Tests for the ability to mixin a custom ``validate_key`` method to
@ -911,28 +924,35 @@ class CacheUtils(unittest.TestCase):
class PrefixedCacheUtils(CacheUtils):
def setUp(self):
super(PrefixedCacheUtils, self).setUp()
self.old_cache_key_prefix = settings.CACHE_KEY_PREFIX
settings.CACHE_KEY_PREFIX = 'cacheprefix'
self.old_cache_key_prefix = settings.CACHES['default'].get('KEY_PREFIX', None)
settings.CACHES['default']['KEY_PREFIX'] = 'cacheprefix'
def tearDown(self):
super(PrefixedCacheUtils, self).tearDown()
settings.CACHE_KEY_PREFIX = self.old_cache_key_prefix
if self.old_cache_key_prefix is None:
del settings.CACHES['default']['KEY_PREFIX']
else:
settings.CACHES['default']['KEY_PREFIX'] = self.old_cache_key_prefix
class CacheHEADTest(unittest.TestCase):
def setUp(self):
self.orig_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.orig_cache_backend = settings.CACHE_BACKEND
self.orig_caches = settings.CACHES
settings.CACHE_MIDDLEWARE_SECONDS = 60
settings.CACHE_MIDDLEWARE_KEY_PREFIX = 'test'
settings.CACHE_BACKEND = 'locmem:///'
settings.CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
}
}
self.path = '/cache/test/'
def tearDown(self):
settings.CACHE_MIDDLEWARE_SECONDS = self.orig_cache_middleware_seconds
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
settings.CACHE_BACKEND = self.orig_cache_backend
settings.CACHES = self.orig_caches
def _get_request(self, method):
request = HttpRequest()
@ -981,7 +1001,7 @@ class CacheI18nTest(unittest.TestCase):
def setUp(self):
self.orig_cache_middleware_seconds = settings.CACHE_MIDDLEWARE_SECONDS
self.orig_cache_middleware_key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
self.orig_cache_backend = settings.CACHE_BACKEND
self.orig_caches = settings.CACHES
self.orig_use_i18n = settings.USE_I18N
self.orig_languages = settings.LANGUAGES
settings.LANGUAGES = (
@ -994,7 +1014,7 @@ class CacheI18nTest(unittest.TestCase):
def tearDown(self):
settings.CACHE_MIDDLEWARE_SECONDS = self.orig_cache_middleware_seconds
settings.CACHE_MIDDLEWARE_KEY_PREFIX = self.orig_cache_middleware_key_prefix
settings.CACHE_BACKEND = self.orig_cache_backend
settings.CACHES = self.orig_caches
settings.USE_I18N = self.orig_use_i18n
settings.LANGUAGES = self.orig_languages
translation.deactivate()
@ -1046,8 +1066,12 @@ class CacheI18nTest(unittest.TestCase):
return UpdateCacheMiddleware().process_response(request, response)
settings.CACHE_MIDDLEWARE_SECONDS = 60
settings.CACHE_MIDDLEWARE_KEY_PREFIX="test"
settings.CACHE_BACKEND='locmem:///'
settings.CACHE_MIDDLEWARE_KEY_PREFIX = "test"
settings.CACHES = {
'default': {
'BACKEND': 'django.core.cache.backends.locmem.LocMemCache'
}
}
settings.USE_ETAGS = True
settings.USE_I18N = True
en_message ="Hello world!"
@ -1083,12 +1107,15 @@ class CacheI18nTest(unittest.TestCase):
class PrefixedCacheI18nTest(CacheI18nTest):
def setUp(self):
super(PrefixedCacheI18nTest, self).setUp()
self.old_cache_key_prefix = settings.CACHE_KEY_PREFIX
settings.CACHE_KEY_PREFIX = 'cacheprefix'
self.old_cache_key_prefix = settings.CACHES['default'].get('KEY_PREFIX', None)
settings.CACHES['default']['KEY_PREFIX'] = 'cacheprefix'
def tearDown(self):
super(PrefixedCacheI18nTest, self).tearDown()
settings.CACHE_KEY_PREFIX = self.old_cache_key_prefix
if self.old_cache_key_prefix is not None:
del settings.CACHES['default']['KEY_PREFIX']
else:
settings.CACHES['default']['KEY_PREFIX'] = self.old_cache_key_prefix
if __name__ == '__main__':
unittest.main()

4
tests/regressiontests/templates/tests.py
View File

@ -1453,8 +1453,6 @@ class Templates(unittest.TestCase):
'url-asvar03': ('{% load url from future %}{% url "no_such_view" as url %}{{ url }}', {}, ''),
### CACHE TAG ######################################################
'cache01': ('{% load cache %}{% cache -1 test %}cache01{% endcache %}', {}, 'cache01'),
'cache02': ('{% load cache %}{% cache -1 test %}cache02{% endcache %}', {}, 'cache02'),
'cache03': ('{% load cache %}{% cache 2 test %}cache03{% endcache %}', {}, 'cache03'),
'cache04': ('{% load cache %}{% cache 2 test %}cache04{% endcache %}', {}, 'cache03'),
'cache05': ('{% load cache %}{% cache 2 test foo %}cache05{% endcache %}', {'foo': 1}, 'cache05'),
@ -1463,8 +1461,6 @@ class Templates(unittest.TestCase):
# Allow first argument to be a variable.
'cache08': ('{% load cache %}{% cache time test foo %}cache08{% endcache %}', {'foo': 2, 'time': 2}, 'cache06'),
'cache09': ('{% load cache %}{% cache time test foo %}cache09{% endcache %}', {'foo': 3, 'time': -1}, 'cache09'),
'cache10': ('{% load cache %}{% cache time test foo %}cache10{% endcache %}', {'foo': 3, 'time': -1}, 'cache10'),
# Raise exception if we don't have at least 2 args, first one integer.
'cache11': ('{% load cache %}{% cache %}{% endcache %}', {}, template.TemplateSyntaxError),