base.py 文件源码

def shutdown_safe(sock):
    """ Shuts down the socket. This is a convenience method for
    code that wants to gracefully handle regular sockets, SSL.Connection
    sockets from PyOpenSSL and ssl.SSLSocket objects from Python 2.6
    interchangeably.  Both types of ssl socket require a shutdown() before
    close, but they have different arity on their shutdown method.

    Regular sockets don't need a shutdown before close, but it doesn't hurt.
    """
    try:
        try:
            # socket, ssl.SSLSocket
            return sock.shutdown(socket.SHUT_RDWR)
        except TypeError:
            # SSL.Connection
            return sock.shutdown()
    except socket.error as e:
        # we don't care if the socket is already closed;
        # this will often be the case in an http server context
        if get_errno(e) not in (errno.ENOTCONN, errno.EBADF):
            raise