Cache the current application on DiscordSocketClient

src/Discord.Net.Commands/Attributes/Preconditions/RequireOwnerAttribute.cs

@@ -13,12 +13,9 @@ namespace Discord.Commands
     [AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false, Inherited = true)]
     public class RequireOwnerAttribute : PreconditionAttribute
     {
-        private IApplication application;
-
         public override async Task<PreconditionResult> CheckPermissions(CommandContext context, CommandInfo command, IDependencyMap map)
         {
-            if (application == null)
-                application = await context.Client.GetApplicationInfoAsync();
+            var application = await context.Client.GetApplicationInfoAsync();
             if (context.User.Id == application.Owner.Id) return PreconditionResult.FromSuccess();
             return PreconditionResult.FromError("Command can only be run by the owner of the bot");
         }

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -38,6 +38,7 @@ namespace Discord.WebSocket
         private int _nextAudioId;
         private bool _canReconnect;
         private DateTimeOffset? _statusSince;
+        private RestApplication _application;
 
         /// <summary> Gets the shard of of this client. </summary>
         public int ShardId { get; }
@@ -333,8 +334,10 @@ namespace Discord.WebSocket
         }
 
         /// <inheritdoc />
-        public Task<RestApplication> GetApplicationInfoAsync()
-            => ClientHelper.GetApplicationInfoAsync(this);
+        public async Task<RestApplication> GetApplicationInfoAsync()
+        { 
+            return _application ?? (_application = await ClientHelper.GetApplicationInfoAsync(this));
+        }
 
         /// <inheritdoc />
         public SocketGuild GetGuild(ulong id)