xenadmin/XenAdmin/Diagnostics/Hotfixing/SingleHotfix.cs

/* Copyright (c) Citrix Systems, Inc. 
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 *     following disclaimer. 
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using XenAdmin.Core;
using XenAPI;

namespace XenAdmin.Diagnostics.Hotfixing
{

    internal class SingleHotfix : Hotfix
    {
        public override string UUID { get; set; }
        public override string Filename { get; set; }

        public sealed override void Apply(Host host, Session session)
        {
            bool elyOrGreater = Helpers.ElyOrGreater(host);
            if (elyOrGreater)
                UploadAndApplyUpdate(host, session);
            else
                UploadAndApplyPatch(host, session);

            IXenObject patch;
            int numberRetries = 0;
            do
            {
                Thread.Sleep(500);
                patch = elyOrGreater
                    ? (IXenObject)host.Connection.Cache.Find_By_Uuid<Pool_update>(UUID)
                    : host.Connection.Cache.Find_By_Uuid<Pool_patch>(UUID);
                numberRetries++;

            } while (patch == null && numberRetries < 10);
        }

        private void UploadAndApplyPatch(Host host, Session session)
        {
            var patch = host.Connection.Cache.Find_By_Uuid<Pool_patch>(UUID);
            if (patch == null)
            {
                var master = Helpers.GetMaster(host.Connection);
                var filePath = Path.Combine(Program.AssemblyDir, String.Format("{0}.{1}", Filename, Branding.Update));
                var action = new Actions.UploadPatchAction(master.Connection, filePath);
                action.RunExternal(session);
                patch = action.PatchRefs[master];
            }
            Pool_patch.apply(session, patch.opaque_ref, host.opaque_ref);
        }

        private void UploadAndApplyUpdate(Host host, Session session)
        {
            var update = host.Connection.Cache.Find_By_Uuid<Pool_update>(UUID);
            if (update == null)
            {
                var master = Helpers.GetMaster(host.Connection);
                var filePath = Path.Combine(Program.AssemblyDir, String.Format("{0}.{1}", Filename, Branding.UpdateIso));
                var action = new Actions.UploadSupplementalPackAction(master.Connection, new List<Host>() { master }, filePath, true);
                action.RunExternal(session);
                update = action.PoolUpdate;
            }
            Pool_update.apply(session, update.opaque_ref, host.opaque_ref);
        }
        
        public override bool ShouldBeAppliedTo(Host host)
        {
            if (Helpers.ElyOrGreater(host))
            {
                var updates = host.Connection.ResolveAll(host.updates);
                return !updates.Any(update => UUID.ToLowerInvariant().Contains(update.uuid.ToLowerInvariant()));
            }
            var patches = host.Connection.ResolveAll(host.patches);
            var poolPatches = patches.Select(hostPatch => hostPatch.Connection.Resolve(hostPatch.pool_patch));
            return !poolPatches.Any(patch => UUID.ToLowerInvariant().Contains(patch.uuid.ToLowerInvariant()));
        }
    }

}