cookie.py 文件源码

def _store(self, messages, response, remove_oldest=True, *args, **kwargs):
        """
        Stores the messages to a cookie, returning a list of any messages which
        could not be stored.

        If the encoded data is larger than ``max_cookie_size``, removes
        messages until the data fits (these are the messages which are
        returned), and add the not_finished sentinel value to indicate as much.
        """
        unstored_messages = []
        encoded_data = self._encode(messages)
        if self.max_cookie_size:
            # data is going to be stored eventually by SimpleCookie, which
            # adds its own overhead, which we must account for.
            cookie = SimpleCookie()  # create outside the loop

            def stored_length(val):
                return len(cookie.value_encode(val)[1])

            while encoded_data and stored_length(encoded_data) > self.max_cookie_size:
                if remove_oldest:
                    unstored_messages.append(messages.pop(0))
                else:
                    unstored_messages.insert(0, messages.pop())
                encoded_data = self._encode(messages + [self.not_finished],
                                            encode_empty=unstored_messages)
        self._update_cookie(encoded_data, response)
        return unstored_messages