server.py 文件源码

def run(self):
        # XXX: why does self.server_bind() fail???
        ## import pdb; pdb.set_trace()

        try:
            # bind and activate the server
            self.server_bind()
            self.server_activate()

        except:
            # close the server
            self.server_close()

            # propagate the error
            raise

        try:
            # join the multicast group
            self.socket.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, self._group_member)

            # process requests until stopped
            self.serve_forever()

        finally:
            # leave the multicast group
            self.socket.setsockopt(socket.IPPROTO_IP, socket.IP_DROP_MEMBERSHIP, self._group_member)

            # close the server
            self.server_close()