xenadmin/XenModel/Actions/Updates/CheckForCdnUpdatesAction.cs

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using Newtonsoft.Json;
using System;
using System.IO;
using XenAdmin.Core;
using XenAdmin.Network;
using XenAPI;


namespace XenAdmin.Actions
{
    public class CheckForCdnUpdatesAction : AsyncAction
    {
        public CheckForCdnUpdatesAction(IXenConnection connection)
            : base(connection, string.Empty)
        {
            Title = Description = string.Format(Messages.YUM_REPO_ACTION_CHECK_FOR_UPDATES, connection.Name);
            ApiMethodsToRoleCheck.Add("http/get_updates");
        }

        public CdnPoolUpdateInfo Updates { get; set; }

        protected override void Run()
        {
            var coordinator = Connection.Resolve(Helpers.GetPoolOfOne(Connection)?.master);
            if (coordinator == null)
                return;

            if (Session == null)
                return;

            UriBuilder builder = new UriBuilder
            {
                Scheme = coordinator.Connection.UriScheme,
                Host = coordinator.address,
                Port = coordinator.Connection.Port,
                Path = "updates",
                Query = $"session_id={Uri.EscapeDataString(Session.opaque_ref)}"
            };

            string json;

            using (Stream httpStream = HTTPHelper.GET(builder.Uri, Connection, true))
            {
                using (var streamReader = new StreamReader(httpStream))
                    json = streamReader.ReadToEnd();
            }

            Updates = JsonConvert.DeserializeObject<CdnPoolUpdateInfo>(json);
        }
    }
}