ssl-handshake.py 文件源码

def _retry(self, fn, *args):
        finished = False
        while not finished:
            want_read = False
            try:
                ret = fn(*args)
            except ssl.SSLWantReadError:
                want_read = True
            except ssl.SSLWantWriteError:
                # can't happen, but if it did this would be the right way to
                # handle it anyway
                pass
            else:
                finished = True
            # do any sending
            data = self.outgoing.read()
            if data:
                self.sock.sendall(data)
            # do any receiving
            if want_read:
                data = self.sock.recv(BUFSIZE)
                if not data:
                    self.incoming.write_eof()
                else:
                    self.incoming.write(data)
            # then retry if necessary
        return ret