xenadmin/XenModel/Actions/VBD/VbdEditAction.cs

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using XenAPI;


namespace XenAdmin.Actions
{
    public class VbdEditAction : AsyncAction
    {
        private readonly VBD _vbd;
        private readonly vbd_mode _vbdMode;
        private readonly bool _changeDevicePosition;
        private readonly VBD _other;
        private readonly string _devicePosition;
        private readonly int _priority;

        public VbdEditAction(VBD vbd, vbd_mode vbdMode, int priority, bool changeDevicePosition, VBD other, string devicePosition, bool suppressHistory)
            : base(vbd.Connection, string.Format(Messages.ACTION_SAVE_SETTINGS, vbd.Connection.Resolve(vbd.VDI)), string.Format(Messages.ACTION_SAVE_SETTINGS, vbd.Connection.Resolve(vbd.VDI)), suppressHistory)
        {
            _vbd = vbd;
            _priority = priority;
            VM = vbd.Connection.Resolve(vbd.VM);
            _vbdMode = vbdMode;
            _changeDevicePosition = changeDevicePosition;
            _other = other;
            _devicePosition = devicePosition;

            ApiMethodsToRoleCheck.AddRange(
                "VBD.set_mode",
                "VBD.set_qos_algorithm_params",
                "VBD.set_userdevice",
                "VBD.plug",
                "VBD.unplug");
        }

        protected override void Run()
        {
            if (_vbdMode != _vbd.mode)
                VBD.set_mode(Session, _vbd.opaque_ref, _vbdMode);

            if(_priority != _vbd.GetIoNice())
            {
                _vbd.SetIoNice(_priority);
                VBD.set_qos_algorithm_params(Session, _vbd.opaque_ref, _vbd.qos_algorithm_params );
            }
                
            if (!_changeDevicePosition)
                return;

            if (_other != null)
            {
                // We're going to have to do a swap

                SetUserDevice(Session, VM, _other, _vbd.userdevice, false);
                SetUserDevice(Session, VM, _vbd, _devicePosition, true);

                if (VM.power_state == vm_power_state.Running && _other.allowed_operations.Contains(vbd_operations.plug))
                    VBD.plug(Session, _other.opaque_ref);
            }
            else
            {
                SetUserDevice(Session, VM, _vbd, _devicePosition, false);
            }
        }

        private static void SetUserDevice(Session session, VM vm, VBD vbd, string userdevice, bool plug)
        {
            if (vm.power_state == vm_power_state.Running &&
                vbd.currently_attached &&
                vbd.allowed_operations.Contains(vbd_operations.unplug))
            {
                VBD.unplug(session, vbd.opaque_ref);
            }

            VBD.set_userdevice(session, vbd.opaque_ref, userdevice);

            if (plug && vbd.allowed_operations.Contains(vbd_operations.plug) && vm.power_state == vm_power_state.Running)
            {
                VBD.plug(session, vbd.opaque_ref);
            }
        }
    }
}