cache.py 文件源码

def get_cache(cache=None):
    """Return ``cache`` or the 'default' cache if ``cache`` is not specified or
    ``cache`` is not configured.

    :param cache: The name of the requested cache.
    """
    try:
        # Check for proper Redis persistent backends
        # FIXME: this logic needs to be a system sanity check
        if (not settings.DEBUG and cache in PERSISTENT_STORES and
                (cache not in settings.CACHES or 'RedisCache' not in
                 settings.CACHES[cache]['BACKEND'] or
                 settings.CACHES[cache].get('TIMEOUT', '') is not None)):
            raise ImproperlyConfigured(
                'Pootle requires a Redis-backed caching backend for %r '
                'with `TIMEOUT: None`. Please review your settings.' % cache
            )

        return caches[cache]
    except InvalidCacheBackendError:
        return default_cache