"Memcached cache backend"

from django.core.cache.backends.base import BaseCache, InvalidCacheBackendError

from django.utils.encoding import smart_unicode, smart_str

try:

    import cmemcache as memcache

except ImportError:

    try:

        import memcache

    except:

        raise InvalidCacheBackendError("Memcached cache backend requires either the 'memcache' or 'cmemcache' library")

class CacheClass(BaseCache):

    def __init__(self, server, params):

        BaseCache.__init__(self, params)

        self._cache = memcache.Client(server.split(';'))

    def add(self, key, value, timeout=0):

        if isinstance(value, unicode):

            value = value.encode('utf-8')

        return self._cache.add(smart_str(key), value, timeout or self.default_timeout)

    def get(self, key, default=None):

        val = self._cache.get(smart_str(key))

        if val is None:

            return default

        else:

            if isinstance(val, basestring):

                return smart_unicode(val)

            else:

                return val

    def set(self, key, value, timeout=0):

        if isinstance(value, unicode):

            value = value.encode('utf-8')

        self._cache.set(smart_str(key), value, timeout or self.default_timeout)

    def delete(self, key):

        self._cache.delete(smart_str(key))

    def get_many(self, keys):

        return self._cache.get_multi(map(smart_str,keys))

    def close(self, **kwargs):

        self._cache.disconnect_all()

    def incr(self, key, delta=1):

        return self._cache.incr(key, delta)

    def decr(self, key, delta=1):

        return self._cache.decr(key, delta)