ó TR¹Nc@s‘dZddlmZddlmZddlmZmZmZm Z de fd„ƒYZ de fd„ƒYZ d e e fd „ƒYZ d S( sæ Cache middleware. If enabled, each Django-powered page will be cached based on URL. The canonical way to enable cache middleware is to set ``UpdateCacheMiddleware`` as your first piece of middleware, and ``FetchFromCacheMiddleware`` as the last:: MIDDLEWARE_CLASSES = [ 'django.middleware.cache.UpdateCacheMiddleware', ... 'django.middleware.cache.FetchFromCacheMiddleware' ] This is counter-intuitive, but correct: ``UpdateCacheMiddleware`` needs to run last during the response phase, which processes middleware bottom-up; ``FetchFromCacheMiddleware`` needs to run last during the request phase, which processes middleware top-down. The single-class ``CacheMiddleware`` can be used for some simple sites. However, if any other piece of middleware needs to affect the cache key, you'll need to use the two-part ``UpdateCacheMiddleware`` and ``FetchFromCacheMiddleware``. This'll most often happen when you're using Django's ``LocaleMiddleware``. More details about how the caching works: * Only parameter-less GET or HEAD-requests with status code 200 are cached. * The number of seconds each page is stored for is set by the "max-age" section of the response's "Cache-Control" header, falling back to the CACHE_MIDDLEWARE_SECONDS setting if the section was not found. * If CACHE_MIDDLEWARE_ANONYMOUS_ONLY is set to True, only anonymous requests (i.e., those not made by a logged-in user) will be cached. This is a simple and effective way of avoiding the caching of the Django admin (and any other user-specific content). * This middleware expects that a HEAD request is answered with a response exactly like the corresponding GET request. * When a hit occurs, a shallow copy of the original response object is returned from process_request. * Pages will be cached based on the contents of the request headers listed in the response's "Vary" header. * This middleware also sets ETag, Last-Modified, Expires and Cache-Control headers on the response object. iÿÿÿÿ(tsettings(tcache(t get_cache_keytlearn_cache_keytpatch_response_headerst get_max_agetUpdateCacheMiddlewarecBs eZdZd„Zd„ZRS(s> Response-phase cache middleware that updates the cache if the response is cacheable. Must be used as part of the two-part update/fetch cache middleware. UpdateCacheMiddleware must be the first piece of middleware in MIDDLEWARE_CLASSES so that it'll get called last during the response phase. cCs1tj|_tj|_ttdtƒ|_dS(NtCACHE_MIDDLEWARE_ANONYMOUS_ONLY(RtCACHE_MIDDLEWARE_SECONDSt cache_timeouttCACHE_MIDDLEWARE_KEY_PREFIXt key_prefixtgetattrtFalsetcache_anonymous_only(tself((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyt__init__@s  cCs½t|dƒ s|j r|S|jdkr1|S|jdksD|St|ƒ}|dkrh|j}n|dkrx|St||ƒ|r¹t||||j ƒ}t j |||ƒn|S(sSets the cache, if needed.t_cache_update_cachetGETiÈiN( thasattrRtmethodt status_codeRtNoneR RRR Rtset(Rtrequesttresponsettimeoutt cache_key((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pytprocess_responseEs      (t__name__t __module__t__doc__RR(((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyR7s tFetchFromCacheMiddlewarecBs eZdZd„Zd„ZRS(s) Request-phase cache middleware that fetches a page from the cache. Must be used as part of the two-part update/fetch cache middleware. FetchFromCacheMiddleware must be the last piece of middleware in MIDDLEWARE_CLASSES so that it'll get called last during the request phase. cCs1tj|_tj|_ttdtƒ|_dS(NR(RRR R R R R R(R((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyRis  cCsÑ|jr$t|dƒs$td‚n|jdks<|jrIt|_dS|jrn|jj ƒrnt|_dSt ||j ƒ}|dkr™t |_dSt j|dƒ}|dkrÄt |_dSt|_|S(sp Checks whether the page is already cached and returns the cached version if available. tusersþThe 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.RtHEAD(sGETsHEADN(RRtAssertionErrorRRR RRR!tis_authenticatedRR tTrueRtget(RRRR((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pytprocess_requestns$        (RRRRR'(((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyR as tCacheMiddlewarecBs eZdZdddd„ZRS(sÌ Cache middleware that provides basic behavior for many simple sites. Also used as the hook point for the cache decorator, which is generated using the decorator-from-middleware utility. cCsy||_|dkr$tj|_n||_|dkrHtj|_n|dkrlttdtƒ|_n ||_dS(NR( R RRRR R R R R(RR R R((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyR’s     N(RRRRR(((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyR(‹sN(Rt django.confRtdjango.core.cacheRtdjango.utils.cacheRRRRtobjectRR R((((sD/home/panlixing/Python_Projects/gaeseries/django/middleware/cache.pyt1s "**