app/django/middleware/cache.py
author Sverre Rabbelier <srabbelier@gmail.com>
Tue, 02 Dec 2008 20:10:23 +0000
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permissions -rw-r--r--
Finish Program Added some fields, and made TinyMCE the editor for the description field. Also updated the public page to show these new fields. We really need generic public views... Patch by: Sverre Rabbelier
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"""
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Cache middleware. If enabled, each Django-powered page will be cached based on
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URL. The canonical way to enable cache middleware is to set
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``UpdateCacheMiddleware`` as your first piece of middleware, and
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``FetchFromCacheMiddleware`` as the last::
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    MIDDLEWARE_CLASSES = [
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        'django.middleware.cache.UpdateCacheMiddleware',
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        ...
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        'django.middleware.cache.FetchFromCacheMiddleware'
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    ]
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This is counter-intuitive, but correct: ``UpdateCacheMiddleware`` needs to run
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last during the response phase, which processes middleware bottom-up;
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``FetchFromCacheMiddleware`` needs to run last during the request phase, which
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processes middleware top-down.
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The single-class ``CacheMiddleware`` can be used for some simple sites.
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However, if any other piece of middleware needs to affect the cache key, you'll
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need to use the two-part ``UpdateCacheMiddleware`` and
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``FetchFromCacheMiddleware``. This'll most often happen when you're using
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Django's ``LocaleMiddleware``.
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More details about how the caching works:
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* Only parameter-less GET or HEAD-requests with status code 200 are cached.
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* The number of seconds each page is stored for is set by the "max-age" section
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  of the response's "Cache-Control" header, falling back to the
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  CACHE_MIDDLEWARE_SECONDS setting if the section was not found.
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* If CACHE_MIDDLEWARE_ANONYMOUS_ONLY is set to True, only anonymous requests
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  (i.e., those not made by a logged-in user) will be cached. This is a simple
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  and effective way of avoiding the caching of the Django admin (and any other
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  user-specific content).
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* This middleware expects that a HEAD request is answered with a response
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  exactly like the corresponding GET request.
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* When a hit occurs, a shallow copy of the original response object is returned
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  from process_request.
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* Pages will be cached based on the contents of the request headers listed in
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  the response's "Vary" header.
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* This middleware also sets ETag, Last-Modified, Expires and Cache-Control
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  headers on the response object.
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"""
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from django.conf import settings
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from django.core.cache import cache
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from django.utils.cache import get_cache_key, learn_cache_key, patch_response_headers, get_max_age
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class UpdateCacheMiddleware(object):
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    """
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    Response-phase cache middleware that updates the cache if the response is
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    cacheable.
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    Must be used as part of the two-part update/fetch cache middleware.
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    UpdateCacheMiddleware must be the first piece of middleware in
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    MIDDLEWARE_CLASSES so that it'll get called last during the response phase.
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    """
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    def __init__(self):
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        self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
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        self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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        self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
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    def process_response(self, request, response):
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        """Sets the cache, if needed."""
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        if not hasattr(request, '_cache_update_cache') or not request._cache_update_cache:
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            # We don't need to update the cache, just return.
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            return response
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        if request.method != 'GET':
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            # This is a stronger requirement than above. It is needed
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            # because of interactions between this middleware and the
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            # HTTPMiddleware, which throws the body of a HEAD-request
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            # away before this middleware gets a chance to cache it.
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            return response
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        if not response.status_code == 200:
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            return response
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        # Try to get the timeout from the "max-age" section of the "Cache-
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        # Control" header before reverting to using the default cache_timeout
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        # length.
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        timeout = get_max_age(response)
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        if timeout == None:
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            timeout = self.cache_timeout
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        elif timeout == 0:
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            # max-age was set to 0, don't bother caching.
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            return response
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        patch_response_headers(response, timeout)
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        if timeout:
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            cache_key = learn_cache_key(request, response, timeout, self.key_prefix)
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            cache.set(cache_key, response, timeout)
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        return response
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class FetchFromCacheMiddleware(object):
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    """
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    Request-phase cache middleware that fetches a page from the cache.
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    Must be used as part of the two-part update/fetch cache middleware.
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    FetchFromCacheMiddleware must be the last piece of middleware in
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    MIDDLEWARE_CLASSES so that it'll get called last during the request phase.
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    """
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    def __init__(self):
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        self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
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        self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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        self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
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    def process_request(self, request):
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        """
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        Checks whether the page is already cached and returns the cached
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        version if available.
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        """
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        if self.cache_anonymous_only:
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            assert hasattr(request, 'user'), "The Django cache middleware with CACHE_MIDDLEWARE_ANONYMOUS_ONLY=True requires authentication middleware to be installed. Edit your MIDDLEWARE_CLASSES setting to insert 'django.contrib.auth.middleware.AuthenticationMiddleware' before the CacheMiddleware."
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        if not request.method in ('GET', 'HEAD') or request.GET:
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            request._cache_update_cache = False
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            return None # Don't bother checking the cache.
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        if self.cache_anonymous_only and request.user.is_authenticated():
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            request._cache_update_cache = False
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            return None # Don't cache requests from authenticated users.
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        cache_key = get_cache_key(request, self.key_prefix)
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        if cache_key is None:
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            request._cache_update_cache = True
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            return None # No cache information available, need to rebuild.
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        response = cache.get(cache_key, None)
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        if response is None:
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            request._cache_update_cache = True
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            return None # No cache information available, need to rebuild.
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        request._cache_update_cache = False
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        return response
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class CacheMiddleware(UpdateCacheMiddleware, FetchFromCacheMiddleware):
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    """
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    Cache middleware that provides basic behavior for many simple sites.
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    Also used as the hook point for the cache decorator, which is generated
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    using the decorator-from-middleware utility.
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    """
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    def __init__(self, cache_timeout=None, key_prefix=None, cache_anonymous_only=None):
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        self.cache_timeout = cache_timeout
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        if cache_timeout is None:
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            self.cache_timeout = settings.CACHE_MIDDLEWARE_SECONDS
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        self.key_prefix = key_prefix
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        if key_prefix is None:
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            self.key_prefix = settings.CACHE_MIDDLEWARE_KEY_PREFIX
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        if cache_anonymous_only is None:
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            self.cache_anonymous_only = getattr(settings, 'CACHE_MIDDLEWARE_ANONYMOUS_ONLY', False)
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        else:
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            self.cache_anonymous_only = cache_anonymous_only