How to use the websockify.websockifyserver function in websockify

def setUp(self):
        super(ProxyRequestHandlerTestCase, self).setUp()
        self.stubs = stubout.StubOutForTesting()
        self.handler = websocketproxy.ProxyRequestHandler(
            FakeSocket(''), "127.0.0.1", FakeServer())
        self.handler.path = "https://localhost:6080/websockify?token=blah"
        self.handler.headers = None
        self.stubs.Set(websockifyserver.WebSockifyServer, 'socket',
                       staticmethod(lambda *args, **kwargs: None))

    def _get_server(self, handler_class=websockifyserver.WebSockifyRequestHandler,
                    **kwargs):
        return websockifyserver.WebSockifyServer(
            handler_class, listen_host='localhost',
            listen_port=80, key=self.tmpdir, web=self.tmpdir,
            record=self.tmpdir, **kwargs)

def test_start_server_error(self):
        server = self._get_server(daemon=False, ssl_only=1, idle_timeout=1)
        sock = server.socket('localhost')

        def fake_select(rlist, wlist, xlist, timeout=None):
            raise Exception("fake error")

        self.stubs.Set(websockifyserver.WebSockifyServer, 'socket',
                       lambda *args, **kwargs: sock)
        self.stubs.Set(websockifyserver.WebSockifyServer, 'daemonize',
                       lambda *args, **kwargs: None)
        self.stubs.Set(select, 'select', fake_select)
        server.start_server()

# Transform to absolute path as daemon may chdir
    if opts.target_cfg:
        opts.target_cfg = os.path.abspath(opts.target_cfg)

    if opts.target_cfg:
        opts.token_plugin = 'TokenFile'
        opts.token_source = opts.target_cfg

    del opts.target_cfg

    if sys.argv.count('--'):
        opts.wrap_cmd = args[1:]
    else:
        opts.wrap_cmd = None

    if not websockifyserver.ssl and opts.ssl_target:
        parser.error("SSL target requested and Python SSL module not loaded.");

    if opts.ssl_only and not os.path.exists(opts.cert):
        parser.error("SSL only and %s not found" % opts.cert)

    if opts.inetd:
        opts.listen_fd = sys.stdin.fileno()
    else:
        if len(args) < 1:
            parser.error("Too few arguments")
        arg = args.pop(0)
        # Parse host:port and convert ports to numbers
        if arg.count(':') > 0:
            opts.listen_host, opts.listen_port = arg.rsplit(':', 1)
            opts.listen_host = opts.listen_host.strip('[]')
        else:

opts.token_plugin = 'TokenFile'
        opts.token_source = opts.target_cfg

    del opts.target_cfg

    # Sanity checks
    if len(args) < 2 and not (opts.token_plugin or opts.unix_target):
        parser.error("Too few arguments")
    if sys.argv.count('--'):
        opts.wrap_cmd = args[1:]
    else:
        opts.wrap_cmd = None
        if len(args) > 2:
            parser.error("Too many arguments")

    if not websockifyserver.ssl and opts.ssl_target:
        parser.error("SSL target requested and Python SSL module not loaded.");

    if opts.ssl_only and not os.path.exists(opts.cert):
        parser.error("SSL only and %s not found" % opts.cert)

    # Parse host:port and convert ports to numbers
    if args[0].count(':') > 0:
        opts.listen_host, opts.listen_port = args[0].rsplit(':', 1)
        opts.listen_host = opts.listen_host.strip('[]')
    else:
        opts.listen_host, opts.listen_port = '', args[0]

    try:    opts.listen_port = int(opts.listen_port)
    except: parser.error("Error parsing listen port")

    if opts.wrap_cmd or opts.unix_target or opts.token_plugin:

opts.token_plugin = 'TokenFile'
        opts.token_source = opts.target_cfg

    del opts.target_cfg

    # Sanity checks
    if len(args) < 2 and not (opts.token_plugin or opts.unix_target):
        parser.error("Too few arguments")
    if sys.argv.count('--'):
        opts.wrap_cmd = args[1:]
    else:
        opts.wrap_cmd = None
        if len(args) > 2:
            parser.error("Too many arguments")

    if not websockifyserver.ssl and opts.ssl_target:
        parser.error("SSL target requested and Python SSL module not loaded.");

    if opts.ssl_only and not os.path.exists(opts.cert):
        parser.error("SSL only and %s not found" % opts.cert)

    # Parse host:port and convert ports to numbers
    if args[0].count(':') > 0:
        opts.listen_host, opts.listen_port = args[0].rsplit(':', 1)
        opts.listen_host = opts.listen_host.strip('[]')
    else:
        opts.listen_host, opts.listen_port = '', args[0]

    try:    opts.listen_port = int(opts.listen_port)
    except: parser.error("Error parsing listen port")

    if opts.wrap_cmd or opts.unix_target or opts.token_plugin: