option.py 文件源码

def _setDNSCache():
    """
    Makes a cached version of socket._getaddrinfo to avoid subsequent DNS requests.
    """

    def _getaddrinfo(*args, **kwargs):
        if args in kb.cache:
            return kb.cache[args]

        else:
            kb.cache[args] = socket._getaddrinfo(*args, **kwargs)
            return kb.cache[args]

    if not hasattr(socket, '_getaddrinfo'):
        socket._getaddrinfo = socket.getaddrinfo
        socket.getaddrinfo = _getaddrinfo