from django.contrib.sessions.backends.base import SessionBase

class SessionStore(SessionBase):

    """

    A simple cookie-based session storage implementation.

    The session key is actually the session data, pickled and encoded.

    This means that saving the session will change the session key.

    """

    def __init__(self, session_key=None):

        super().__init__(session_key)

    def exists(self, session_key):

        return False

    def create(self):

        self._session_key = self.encode({})

    def save(self, must_create=False):

        self._session_key = self.encode(self._session)

    def delete(self, session_key=None):

        self._session_key = self.encode({})

    def load(self):

        try:

            return self.decode(self.session_key)

        except Exception:

            self.modified = True

            return {}