o ]f@sndZddlZddlZddlmZddlmZedj Z GdddeeZGdd d eZ Gd d d e Z dS) z flask_caching.backends.memcache ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The memcache caching backend. :copyright: (c) 2018 by Peter Justin. :copyright: (c) 2010 by Thadeus Burgess. :license: BSD, see LICENSE for more details. N)MemcachedCache) BaseCachez[^\x00-\x21\xff]{1,250}$c@sBeZdZdZdddZeddZdd Zdd d Zdd dZ dS)raA cache that uses memcached as backend. The first argument can either be an object that resembles the API of a :class:`memcache.Client` or a tuple/list of server addresses. In the event that a tuple/list is passed, Werkzeug tries to import the best available memcache library. This cache looks into the following packages/modules to find bindings for memcached: - ``pylibmc`` - ``google.appengine.api.memcached`` - ``memcached`` - ``libmc`` Implementation notes: This cache backend works around some limitations in memcached to simplify the interface. For example unicode keys are encoded to utf-8 on the fly. Methods such as :meth:`~BaseCache.get_dict` return the keys in the same format as passed. Furthermore all get methods silently ignore key errors to not cause problems when untrusted user data is passed to the get methods which is often the case in web applications. :param servers: a list or tuple of server addresses or alternatively a :class:`memcache.Client` or a compatible client. :param default_timeout: the default timeout that is used if no timeout is specified on :meth:`~BaseCache.set`. A timeout of 0 indicates that the cache never expires. :param key_prefix: a prefix that is added before all keys. This makes it possible to use the same memcached server for different applications. Keep in mind that :meth:`~BaseCache.clear` will also clear keys with a different prefix. N,cCs$tj||dtj||||ddS)Ndefault_timeout)serversr key_prefix)r__init__CachelibMemcachedCache)selfrrrr X/home/ubuntu/webapp/venv/lib/python3.10/site-packages/flask_caching/backends/memcache.pyr :s zMemcachedCache.__init__cCs0||d|t|dd||i|S)NCACHE_MEMCACHED_SERVERSCACHE_KEY_PREFIX)rappendupdatedictclsappconfigargskwargsr r r factoryCszMemcachedCache.factorycGs6g}|D]}||}t|r||q|j|SN)_normalize_key_test_memcached_keyr_client delete_multi)r keysnew_keyskeyr r r delete_manyIs   zMemcachedCache.delete_manycC||}|j||Sr)rrincrr r"deltar r r incQ zMemcachedCache.inccCr%r)rrdecrr'r r r decUr*zMemcachedCache.dec)NrN)r$) __name__ __module__ __qualname____doc__r classmethodrr#r)r,r r r r rs "  rcs4eZdZ     dfdd ZeddZZS)SASLMemcachedCacheNrc sJtj|d|durdg}ddl}|j|f||dd||_||_dS)Nrz127.0.0.1:11211rT)usernamepasswordbinary)superr pylibmcClientrr)r rrrr3r4rr7 __class__r r r [s  zSASLMemcachedCache.__init__cCs<||d|t|d|d|dd||i|SNrCACHE_MEMCACHED_USERNAMECACHE_MEMCACHED_PASSWORDr)r3r4rrrr r r rqszSASLMemcachedCache.factory)NrNNN)r-r.r/r r1r __classcell__r r r9r r2Zsr2csveZdZdZfddZeddZfddZdfd d Zdfd d Z dfdd Z ddZ fddZ Z S)SpreadSASLMemcachedCachezSimple Subclass of SASLMemcached client that will spread the value across multiple keys if they are bigger than a given threshold. Spreading requires using pickle to store the value, which can significantly impact the performance. cs2|dd|_|dd|_tj|i|dS)z Kwargs: chunksize (int): max length of a pickled object that can fit in memcached (memcache has an upper limit of 1MB for values, default: 1048448) chunksizeimaxchunk N)getr@rAr6r )r rrr9r r r sz!SpreadSASLMemcachedCache.__init__cCsB||d|t|d|d|dd||i|Sr;)rrrrCrr r r rsz SpreadSASLMemcachedCache.factorycs ||D]}t|qdSr)_genkeysr6delete)r r"skeyr9r r rEszSpreadSASLMemcachedCache.deleteNTcs&|r |j|||dStj|||dS)a4Set a value in cache, potentially spreading it across multiple key. :param key: The cache key. :param value: The value to cache. :param timeout: The timeout after which the cache will be invalidated. :param chunk: If set to `False`, then spreading across multiple keys is disabled. This can be faster, but it will fail if the value is bigger than the chunks. It requires you to get back the object by specifying that it is not spread. )timeout)_setr6set)r r"valuerGchunkr9r r rIs zSpreadSASLMemcachedCache.setc st|d}i}t|}td||j}t||jkr!td|j|D]}||||j||d||j<q#t||dS)Nrz'Cannot store value in less than %s keys.) pickledumpslenranger@rA ValueErrorr6set_many) r r"rJrG serializedvalueslen_serchksir9r r rHs (zSpreadSASLMemcachedCache._setcs|r||St|S)zGet a cached value. :param chunk: If set to ``False``, it will return a cached value that is spread across multiple keys. )_getr6rC)r r"rKr9r r rCs  zSpreadSASLMemcachedCache.getcsfddt|jDS)Ncg|] }d|qSrMr .0rXr"r r z5SpreadSASLMemcachedCache._genkeys..)rQrA)r r"r r^r rDsz!SpreadSASLMemcachedCache._genkeyscsJfddt|jD}tj|}ddd|D}|s dSt|S)NcrZr[r r\r^r r r_r`z1SpreadSASLMemcachedCache._get..css|] }|dur|VqdSrr )r]vr r r sz0SpreadSASLMemcachedCache._get..)rQrAr6get_manyjoinrNloads)r r"to_getresultrTr9r^r rYs   zSpreadSASLMemcachedCache._get)NTr)T)r-r.r/r0r r1rrErIrHrCrDrYr>r r r9r r?~s    r?) r0rNrecachelibrr flask_caching.backends.basercompilematchrr2r?r r r r s    C$