Synnefo

        fqdn = get_server_fqdn(vm)

        d["SNF:fqdn"] = fqdn

        d["SNF:port_forwarding"] = get_server_port_forwarding(vm, fqdn)

def get_server_port_forwarding(vm, fqdn):

    """Create API 'port_forwarding' attribute from corresponding setting.

    Create the 'port_forwarding' API vm attribute based on the corresponding

    setting (CYCLADES_PORT_FORWARDING), which can be either a tuple

    of the form (host, port) or a callable object returning such tuple. In

    case of callable object, must be called with the following arguments:

    * ip_address

    * server_id

    * fqdn

    * owner UUID

    """

    port_forwarding = {}

    for dport, to_dest in settings.CYCLADES_PORT_FORWARDING.items():

        if hasattr(to_dest, "__call__"):

            public_nics = vm.nics.filter(network__public=True, state="ACTIVE")\

                                 .exclude(ipv4=None).order_by('index')

            if public_nics:

                vm_ipv4 = public_nics[0].ipv4

            else:

                vm_ipv4 = None

            to_dest = to_dest(vm_ipv4, vm.id, fqdn, vm.userid)

        msg = ("Invalid setting: CYCLADES_PORT_FOWARDING."

               " Value must be a tuple of two elements (host, port).")

        if to_dest is None:

            continue

        if not isinstance(to_dest, tuple) or len(to_dest) != 2:

                raise faults.InternalServerError(msg)

        else:

            try:

                host, port = to_dest

            except (TypeError, ValueError):

                raise faults.InternalServerError(msg)

        port_forwarding[dport] = {"host": host, "port": str(port)}

    return port_forwarding