class NfeRepositorio:

    def __init__(self, db_session: sessionmaker):
        self.session_factory = scoped_session(db_session)
        self._session = None

    def __enter__(self):
        return self

    def __exit__(self, ex_type, ex_value, ex_traceback):
        self.session_factory.remove()

    @property
    def session(self):
        if not self._session:x
            self._session = self.session_factory()
        return self._session

orm_engine = create_engine(
    get_config().ORM_ENGINE_TEMPLATE.format(
        get_config().DB_PROTOCOL,
        get_config().DB_USERNAME,
        get_config().DB_PASSWORD,
        get_config().DB_HOST,
        get_config().DB_NAME
    ),
    echo=get_config().ORM_ECHO,
    pool_recycle=3600
)