î ªÍXjã@s­dZddlmZddlmZmZddlmZmZm Z m Z m Z ddl m Z Gdd„de ƒZGdd „d e ƒZGd d „d eeƒZd S) aÙ 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. é)Úsettings)ÚDEFAULT_CACHE_ALIASÚcaches)Ú get_cache_keyÚ get_max_ageÚhas_vary_headerÚlearn_cache_keyÚpatch_response_headers)ÚMiddlewareMixinc@s=eZdZdZddd„Zdd„Zdd„ZdS) ÚUpdateCacheMiddlewarea6 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) rÚCACHE_MIDDLEWARE_SECONDSÚ cache_timeoutÚCACHE_MIDDLEWARE_KEY_PREFIXÚ key_prefixÚCACHE_MIDDLEWARE_ALIASÚ cache_aliasrÚcacheÚ get_response)Úselfr©rúE/home/ubuntu/projects/ifolica/build/django/django/middleware/cache.pyÚ__init__@s    zUpdateCacheMiddleware.__init__cCst|dƒo|jS)NÚ_cache_update_cache)Úhasattrr)rÚrequestÚresponserrrÚ_should_update_cacheGsz*UpdateCacheMiddleware._should_update_cachecsˆj||ƒs|S|js.|jdkr2|S|j rX|jrXt|dƒrX|St|ƒ‰ˆdkr|ˆj‰nˆdkrŒ|St|ˆƒˆrt ||ˆˆj dˆj ƒ‰t |dƒrt |jƒr|j‡‡‡fdd†ƒqˆj jˆ|ˆƒn|S) zSets the cache, if needed.éÈÚCookieNrrÚrendercsˆjjˆ|ˆƒS)N)rÚset)Úr)Ú cache_keyrÚtimeoutrrÚfsz8UpdateCacheMiddleware.process_response..)rZ streamingÚ status_codeZCOOKIESÚcookiesrrr r rrrrÚcallablerZadd_post_render_callbackr )rrrr)r"rr#rÚprocess_responseJs&"     !z&UpdateCacheMiddleware.process_response)Ú__name__Ú __module__Ú __qualname__Ú__doc__rrr(rrrrr 7s  r c@s1eZdZdZddd„Zdd„ZdS)ÚFetchFromCacheMiddlewarea! 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)rrrrrrus  z!FetchFromCacheMiddleware.__init__cCsÙ|jdkrd|_dSt||jdd|jƒ}|dkrSd|_dS|jj|ƒ}|dkr³|jdkr³t||jdd|jƒ}|jj|ƒ}n|dkrÌd|_dSd|_|S)zp Checks whether the page is already cached and returns the cached version if available. ÚGETÚHEADFNrT)zGETzHEAD)ÚmethodrrrrÚget)rrr"rrrrÚprocess_request{s       z(FetchFromCacheMiddleware.process_request)r)r*r+r,rr2rrrrr-ms r-c@s(eZdZdZdddd„ZdS)ÚCacheMiddlewarezÌ 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. NcKsÒ||_y#|d}|dkr+d}nWntk rItj}YnX||_y#|d}|dkrut}nWntk r“tj}YnX||_|dkrµtj}n||_ t |j|_ dS)NrÚr) rÚKeyErrorrrrrrrr r rr)rrr ÚkwargsrrrrrrŸs&              zCacheMiddleware.__init__)r)r*r+r,rrrrrr3˜s r3N)r,Z django.confrZdjango.core.cacherrZdjango.utils.cacherrrrr Zdjango.utils.deprecationr r r-r3rrrrÚ,s(6+