def set_state(name, backend, state, socket=DEFAULT_SOCKET_URL):
    '''
    Force a server's administrative state to a new state. This can be useful to
    disable load balancing and/or any traffic to a server. Setting the state to
    "ready" puts the server in normal mode, and the command is the equivalent of
    the "enable server" command. Setting the state to "maint" disables any traffic
    to the server as well as any health checks. This is the equivalent of the
    "disable server" command. Setting the mode to "drain" only removes the server
    from load balancing but still allows it to be checked and to accept new
    persistent connections. Changes are propagated to tracking servers if any.

    name
        Server name

    backend
        haproxy backend

    state
        A string of the state to set. Must be 'ready', 'drain', or 'maint'

    socket
        haproxy stats socket, default ``/var/run/haproxy.sock``

    CLI Example:

    .. code-block:: bash

        salt '*' haproxy.set_state my_proxy_server my_backend ready

    '''
    # Pulling this in from the latest 0.5 release which is not yet in PyPi.
    # https://github.com/neurogeek/haproxyctl
    class setServerState(haproxy.cmds.Cmd):
        """Set server state command."""
        cmdTxt = "set server %(backend)s/%(server)s state %(value)s\r\n"
        p_args = ['backend', 'server', 'value']
        helpTxt = "Force a server's administrative state to a new state."

    ha_conn = _get_conn(socket)
    ha_cmd = setServerState(server=name, backend=backend, value=state)
    return ha_conn.sendCmd(ha_cmd)