v^)@sdZddlmZddlmZmZddlmZmZm 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)MiddlewareMixinc@s=eZdZdZdddZddZddZdS) 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. NcCsAtj|_tj|_tj|_t|j|_||_ dS)N) rCACHE_MIDDLEWARE_SECONDS cache_timeoutCACHE_MIDDLEWARE_KEY_PREFIX key_prefixCACHE_MIDDLEWARE_ALIAS cache_aliasrcache get_response)selfrr9/tmp/pip-build-8lau8j11/django/django/middleware/cache.py__init__@s    zUpdateCacheMiddleware.__init__cCst|do|jS)N_cache_update_cache)hasattrr)rrequestresponserrr_should_update_cacheGsz*UpdateCacheMiddleware._should_update_cachecsEj||s|S|js.|jd kr2|S|j rX|jrXt|drX|Sd|jdfkrt|St|dkrjndkr|St |rA|jdkrAt ||j dj t |d r+t|jr+|jfd d nj j||S) zSet the cache, if needed.0CookieZprivatez Cache-ControlNrrrendercsjj|S)N)rset)r) cache_keyrtimeoutrrjsz8UpdateCacheMiddleware.process_response..)rr)rZ streaming status_codeZCOOKIEScookiesrgetrr r rrrrcallabler Zadd_post_render_callbackr!)rrrr)r#rr$rprocess_responseJs*"     !z&UpdateCacheMiddleware.process_response)__name__ __module__ __qualname____doc__rrr*rrrrr 7s  r c@s1eZdZdZdddZddZdS)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. NcCs5tj|_tj|_t|j|_||_dS)N)rrrrrrrr)rrrrrrys  z!FetchFromCacheMiddleware.__init__cCs|jdkrd|_dSt||jdd|j}|dkrSd|_dS|jj|}|dkr|jdkrt||jdd|j}|jj|}|dkrd|_dSd|_|S)zn Check whether the page is already cached and return the cached version if available. GETHEADFNrT)zGETzHEAD)methodrrrrr()rrr#rrrrprocess_requests       z(FetchFromCacheMiddleware.process_request)r+r,r-r.rr3rrrrr/qs r/c@s(eZdZdZddddZdS)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. NcKs||_y |d}|dkr(d}Wntk rFtj}YnX||_y |d}|dkrot}Wntk rtj}YnX||_|dkrtj}||_ t |j|_ dS)Nrr) rKeyErrorrrrrrrr r rr)rrr kwargsrrrrrrs&              zCacheMiddleware.__init__)r+r,r-r.rrrrrr4s r4N)r.Z django.confrZdjango.core.cacherrZdjango.utils.cacherrrrr Zdjango.utils.deprecationr r r/r4rrrr,s(:+