volume-visualization/visualization/memcached.py

from django.core.cache.backends.memcached import BaseMemcachedCache

import memcache
DEFAULT_MAX_VALUE_LENGTH = 1024 * 1024 * 15


class MemcachedCache(BaseMemcachedCache):
    def __init__(self, server, params):
        self._options = params.get("OPTIONS", {})
        memcache.SERVER_MAX_VALUE_LENGTH = self._options.get('SERVER_MAX_VALUE_LENGTH', DEFAULT_MAX_VALUE_LENGTH)

        super(MemcachedCache, self).__init__(
            server,
            params,
            library=memcache,
            value_not_found_exception=ValueError
        )

    @property
    def _cache(self):
        if getattr(self, '_client', None) is None:
            server_max_value_length = memcache.SERVER_MAX_VALUE_LENGTH
            '''
            one could optionally send more parameters here through the options settings,
            I simplified here for brevity
            '''
            self._client = self._lib.Client(
                self._servers,
                server_max_value_length=server_max_value_length
            )

        return self._client