cache.py 文件源码

def Decoder(self, raw):
        """Safe Unpickling.

        Unpickle only safe primitives like tuples, dicts and
        strings. Specifically does not allow arbitrary instances to be
        recovered.
        """
        now = time.time()
        unpickler = cPickle.Unpickler(cStringIO.StringIO(raw))
        unpickler.find_global = None

        try:
            decoded = unpickler.load()
        except Exception:
            raise io_manager.DecodeError("Unable to unpickle cached object")

        result = self.renderer.decoder.Decode(decoded)
        self.session.logging.debug("Decoded in %s sec.", time.time() - now)

        return result