xenadmin/XenModel/Actions/WLB/DisableWLBAction.cs

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using System;
using XenAdmin.Core;
using XenAdmin.Wlb;
using XenAPI;


namespace XenAdmin.Actions.Wlb
{
    public class DisableWLBAction : AsyncAction
    {
        private static readonly log4net.ILog log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
        private readonly bool _deconfigure;
        private static string OPTIMIZINGPOOL = "wlb_optimizing_pool";

        public DisableWLBAction(Pool pool, bool deconfigure)
            : base(pool.Connection, string.Format(Messages.DISABLING_WLB_ON, Helpers.GetName(pool).Ellipsise(50)), Messages.DISABLING_WLB, false)
        {
            Pool = pool;
            _deconfigure = deconfigure;

            if (deconfigure)
            {
                Title = string.Format(Messages.DECONFIGURING_WLB_ON, Helpers.GetName(pool).Ellipsise(50));
                Description = Messages.DECONFIGURING_WLB;
            }

            #region RBAC Dependencies
            ApiMethodsToRoleCheck.AddRange("pool.set_wlb_enabled", "pool.deconfigure_wlb");
            #endregion
        }

        protected override void Run()
        {
            if (_deconfigure)
            {
                try
                {
                    if (!Pool.wlb_enabled)
                    {
                        log.Debug("Resuming WLB (prior to disconnecting) for pool " + Pool.Name());
                        Pool.set_wlb_enabled(Session, Pool.opaque_ref, true);
                        log.Debug("Success resuming WLB on pool " + Pool.Name());
                    }

                    log.Debug($"Disconnecting Workload Balancing from pool {Pool.Name()} and removing all pool data");
                    Pool.deconfigure_wlb(Session);
                    log.Debug("Success disconnecting Workload Balancing on pool " + Pool.Name());

                    WlbServerState.SetState(Session, Pool, WlbServerState.ServerState.NotConfigured);
                    Description = Messages.COMPLETED;
                }
                catch (Failure f)
                {
                    Pool.set_wlb_enabled(Session, Pool.opaque_ref, false);
                    WlbServerState.SetState(Session, Pool, WlbServerState.ServerState.ConnectionError, f);
                    log.Debug($"Disconnecting  Workload Balancing failed on pool {Pool.Name()}. Workload Balancing has been paused.", f);

                    throw new Exception(string.Format(Messages.ACTION_WLB_DECONFIGURE_FAILED, Pool.Name(), f));
                }
            }
            else
            {
                try
                {
                    log.Debug("Pausing Workload Balancing on pool " + Pool.Name());
                    Pool.set_wlb_enabled(Session, Pool.opaque_ref, false); 
                    log.Debug("Success pausing Workload Balancing on pool " + Pool.Name());

                    Connection.WaitFor(() => !Pool.wlb_enabled, null);
                    WlbServerState.SetState(Session, Pool, WlbServerState.ServerState.Disabled);
                    Description = Messages.COMPLETED;
                }
                catch (Failure f)
                {
                    WlbServerState.SetState(Session, Pool, WlbServerState.ServerState.ConnectionError, f);
                    throw;
                }
            }
        }

        protected override void Clean()
        {
             //Clear the Optimizing Pool flag in case it was left behind
             Helpers.SetOtherConfig(Session, Pool, OPTIMIZINGPOOL, string.Empty);
        }
    }
}