xenadmin/XenAdmin/Diagnostics/Checks/UpgradeRequiresEUA.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using XenAdmin.Core;
using XenAPI;
using XenAdmin.Diagnostics.Problems;
using XenAdmin.Diagnostics.Problems.UtilityProblem;
using XenAdmin.Diagnostics.Hotfixing;
using XenAdmin.Diagnostics.Problems.HostProblem;

namespace XenAdmin.Diagnostics.Checks
{
    internal class UpgradeRequiresEua : UpgradeCheck
    {
        private static readonly log4net.ILog Log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod()?.DeclaringType);

        private readonly Uri _targetUri;
        private readonly Control _control;
        private readonly HashSet<string> _euas;
        private readonly HashSet<IXenObject> _hostsFailedToFetchEua;
        private readonly Dictionary<string, string> _installMethodConfig;

        public UpgradeRequiresEua(Control control, List<Host> hosts, Dictionary<string, string> installMethodConfig)
            : base(hosts)
        {
            if (installMethodConfig == null || !installMethodConfig.TryGetValue("url", out var uriText))
                return;

            _installMethodConfig = installMethodConfig;
            _control = control;

            try
            {
                _targetUri = new Uri(uriText);
            }
            catch (Exception ex)
            {
                Log.Error(ex);
            }

            _euas = new HashSet<string>();
            _hostsFailedToFetchEua = new HashSet<IXenObject>();
        }

        public override bool CanRun() => _targetUri != null;

        private void FetchHostEua(Host host)
        {
            string eua = null;
            if (Helpers.YangtzeOrGreater(host) && !Helpers.TryLoadHostEua(host, _targetUri?.OriginalString, out eua))
            {
                Log.Warn($"Could not fetch EUA file for {host.Name()}");
                lock (_hostsFailedToFetchEua)
                {
                    _hostsFailedToFetchEua.Add(host);
                }
                return;
            }

            lock (_euas)
            {
                _euas.Add(eua);
            }
        }

        protected override Problem RunCheck()
        {
            if (Hosts.Count == 0)
            {
                return null;
            }

            foreach (var host in Hosts)
            {
                var hotfix = HotfixFactory.Hotfix(host);
                if (hotfix != null && hotfix.ShouldBeAppliedTo(host))
                    return new HostDoesNotHaveHotfixWarning(this, host);
            }

            string upgradePlatformVersion = null;
            if (_installMethodConfig != null)
                Host.TryGetUpgradeVersion(Hosts.FirstOrDefault(), _installMethodConfig, out upgradePlatformVersion, out _);

            // There's no EUA for Pre-82X versions
            if (!Helpers.NileOrGreater(upgradePlatformVersion))
            {
                return null;
            }

            Hosts.AsParallel().ForAll(FetchHostEua);
            lock (_hostsFailedToFetchEua)
            {
                if (_hostsFailedToFetchEua.Count > 0)
                {
                    return new EuaNotFoundProblem(this, _hostsFailedToFetchEua.ToList());
                }
            }
            lock (_euas)
            {
                return new EuaNotAcceptedProblem( _control, this, _euas.Where(eua => eua != null).ToList());
            }
        }

        public override string Description => Messages.ACCEPT_EUA_CHECK_DESCRIPTION;

        public override bool Equals(object obj)
        {
            if (!(obj is UpgradeRequiresEua item))
            {
                return false;
            }

            // if the number of hosts that failed to fetch the EUA is not zero, we 
            // never consider the Checks equal. This is because this Check is used as a
            // permanent check
            lock (_hostsFailedToFetchEua)
            {
                if (_hostsFailedToFetchEua != null)
                {
                    if (_hostsFailedToFetchEua.Count > 0)
                    {
                        return false;
                    }

                    lock (item._hostsFailedToFetchEua)
                    {
                        if (item._hostsFailedToFetchEua != null && item._hostsFailedToFetchEua.Count > 0)
                        {
                            return false;
                        }
                    }
                }
            }

            return _targetUri.Equals(item._targetUri) && base.Equals(obj);
        }

        public override int GetHashCode()
        {
            return _targetUri.GetHashCode() ^ base.GetHashCode();
        }
    }
}