xenadmin/XenAdmin/Wizards/PatchingWizard/PlanActions/RestartHostPlanAction.cs

/* Copyright (c) Citrix Systems, Inc. 
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using System.Collections.Generic;
using System.Text;
using XenAdmin.Core;
using XenAPI;


namespace XenAdmin.Wizards.PatchingWizard.PlanActions
{
    public class RestartHostPlanAction : RebootPlanAction
    {
        private readonly List<XenRef<VM>> _vms;
        public bool EnableOnly { get; set; }
        private readonly bool _restartAgentFallback;

        public RestartHostPlanAction(Host host, List<XenRef<VM>> vms, bool enableOnly = false, bool restartAgentFallback = false)
            : base(host, string.Empty)
        {
            _vms = vms;
            EnableOnly = enableOnly;
            _restartAgentFallback = restartAgentFallback;
        }

        protected override void RunWithSession(ref Session session)
        {
            var hostObj = GetResolvedHost();

            if (Helpers.ElyOrGreater(hostObj))
            {
                log.DebugFormat("Checking host.patches_requiring_reboot now on '{0}'.", hostObj);

                if (hostObj.updates_requiring_reboot.Count > 0)
                {
                    log.DebugFormat("Found {0} patches requiring reboot (live patching failed)."
                                    + "Initiating evacuate-reboot-bringbabiesback process.",
                        hostObj.updates_requiring_reboot.Count);
                }
                else if (_restartAgentFallback)
                {
                    log.Debug("Live patching succeeded. Restarting agent.");
                    Visible = true;
                    Title = ProgressDescription = string.Format(Messages.UPDATES_WIZARD_RESTARTING_AGENT, hostObj.Name());
                    WaitForReboot(ref session, Host.AgentStartTime, s => Host.async_restart_agent(s, HostXenRef.opaque_ref));
                    return;
                }
                else
                {
                    log.Debug("Did not find patches requiring reboot (live patching succeeded)."
                              + " Skipping scheduled restart.");
                    return;
                }
            }

            Visible = true;
            var sb = new StringBuilder();
            
            var vms = hostObj.GetRunningVMs();
            if (vms.Count > 0)
            {
                sb.Append(string.Format(Messages.PLANACTION_VMS_MIGRATING, hostObj.Name()));
                ProgressDescription = sb.ToString();
                EvacuateHost(ref session);
                sb.AppendLine(Messages.DONE);
            }

            sb.AppendIndented(string.Format(Messages.UPDATES_WIZARD_REBOOTING, hostObj.Name()), sb.Length > 0 ? 2 : 0);
            ProgressDescription = sb.ToString();
            RebootHost(ref session);
            sb.AppendLine(Messages.DONE);

            sb.AppendIndented(string.Format(Messages.UPDATES_WIZARD_EXITING_MAINTENANCE_MODE, hostObj.Name()));
            ProgressDescription = sb.ToString();
            BringBabiesBack(ref session, _vms, EnableOnly);
        }
    }
}