B CVvg# @s~dZddlmZddlmZmZddlmZmZm Z m Z m Z ddl m Z Gddde ZGdd d e ZGd d d eeZd S) a 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 = [ '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 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. * This middleware expects that a HEAD request is answered with the same response headers 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. )settings)DEFAULT_CACHE_ALIAScaches) get_cache_key get_max_agehas_vary_headerlearn_cache_keypatch_response_headers)MiddlewareMixincs2eZdZdZd fdd ZddZddZZS) UpdateCacheMiddlewarea6 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 so that it'll get called last during the response phase. Ncs:t|tj|_d|_tj|_tj|_ t |j |_ dS)N) super__init__rZCACHE_MIDDLEWARE_SECONDS cache_timeout page_timeoutCACHE_MIDDLEWARE_KEY_PREFIX key_prefixCACHE_MIDDLEWARE_ALIAS cache_aliasrcache)self get_response) __class__;/tmp/pip-install-o3oxmrkh/Django/django/middleware/cache.pyr Bs  zUpdateCacheMiddleware.__init__cCst|do|jS)N_cache_update_cache)hasattrr)rrequestresponserrr_should_update_cacheJsz*UpdateCacheMiddleware._should_update_cachecs||s|S|js |jdkr$|S|js>|jr>t|dr>|Sd|ddkrR|Sjdkrt|dkrxj n dkr|St |r|jdkrt ||j j d t|d rt|jr|fd d nj ||S) zSet the cache, if needed.)i0CookieZprivatez Cache-ControlrNrr)rrendercsj|S)N)rset)r) cache_keyrtimeoutrrpz8UpdateCacheMiddleware.process_response..)rZ streaming status_codeZCOOKIEScookiesrgetrrrr rrrrcallabler!Zadd_post_render_callbackr")rrrr)r$rr%rprocess_responseMs.  z&UpdateCacheMiddleware.process_response)N)__name__ __module__ __qualname____doc__r rr, __classcell__rr)rrr 7sr cs*eZdZdZdfdd ZddZZS)FetchFromCacheMiddlewarea! 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 so that it'll get called last during the request phase. Ncs,t|tj|_tj|_t|j|_dS)N) r r rrrrrrr)rr)rrrr s z!FetchFromCacheMiddleware.__init__cCs|jdkrd|_dSt||jd|jd}|dkr:d|_dS|j|}|dkrx|jdkrxt||jd|jd}|j|}|dkrd|_dSd|_|S)zn Check whether the page is already cached and return the cached version if available. )GETHEADFNr3)rTr4)methodrrrrr*)rrr$rrrrprocess_requests    z(FetchFromCacheMiddleware.process_request)N)r-r.r/r0r r6r1rr)rrr2wsr2cs"eZdZdZdfdd ZZS)CacheMiddlewarez 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. Nc st|y|d}|dkr"d}||_Wntk r>YnXy*|d}|dkrVt}||_t|j|_Wntk r~YnX|dk r||_||_ dS)Nrr) r r rKeyErrorrrrrrr)rrrrkwargsrr)rrrr s&  zCacheMiddleware.__init__)NNN)r-r.r/r0r r1rr)rrr7sr7N)r0Z django.confrZdjango.core.cacherrZdjango.utils.cacherrrrr Zdjango.utils.deprecationr r r2r7rrrr,s  @-