sessions.py 文件源码

def get_user_session():
    if has_request_context() and not hasattr(_request_ctx_stack.top, 'user_session'):
        # Look in the header
        user_session = get_user_session_from_header()

        # Fallback to the cookie
        if user_session is None:
            user_session = get_user_session_from_cookie()

        if user_session is not None:
            user = user_session.user

            if not user.is_enabled:
                user_session = None

        # Set the user session
        _request_ctx_stack.top.user_session = user_session

    user_session = getattr(_request_ctx_stack.top, 'user_session', None)

    if user_session is None:
        user_session = AnonymousSession()

    return user_session