Drop applicationinfo cache on logout, fixed RPC appinfo exception.

src/Discord.Net.Rest/DiscordRestClient.cs

@@ -8,6 +8,8 @@ namespace Discord.Rest
 {
     public class DiscordRestClient : BaseDiscordClient, IDiscordClient
     {
+        private RestApplication _applicationInfo;
+
         public new RestSelfUser CurrentUser => base.CurrentUser as RestSelfUser;
 
         public DiscordRestClient() : this(new DiscordRestConfig()) { }
@@ -21,10 +23,17 @@ namespace Discord.Rest
             base.CurrentUser = RestSelfUser.Create(this, ApiClient.CurrentUser);
             return Task.CompletedTask;
         }
+        protected override Task OnLogoutAsync()
+        {
+            _applicationInfo = null;
+            return Task.CompletedTask;
+        }
 
         /// <inheritdoc />
-        public Task<RestApplication> GetApplicationInfoAsync()
-            => ClientHelper.GetApplicationInfoAsync(this);
+        public async Task<RestApplication> GetApplicationInfoAsync()
+        {
+            return _applicationInfo ?? (_applicationInfo = await ClientHelper.GetApplicationInfoAsync(this));
+        }
         
         /// <inheritdoc />
         public Task<RestChannel> GetChannelAsync(ulong id)

src/Discord.Net.Rpc/DiscordRpcClient.cs

@@ -14,7 +14,7 @@ using System.Threading.Tasks;
 
 namespace Discord.Rpc
 {
-    public partial class DiscordRpcClient : BaseDiscordClient
+    public partial class DiscordRpcClient : BaseDiscordClient, IDiscordClient
     {
         private readonly Logger _rpcLogger;
         private readonly JsonSerializer _serializer;
@@ -33,7 +33,7 @@ namespace Discord.Rpc
 
         public new API.DiscordRpcApiClient ApiClient => base.ApiClient as API.DiscordRpcApiClient;
         public new RestSelfUser CurrentUser { get { return base.CurrentUser as RestSelfUser; } private set { base.CurrentUser = value; } }
-        public RestApplication CurrentApplication { get; private set; }
+        public RestApplication ApplicationInfo { get; private set; }
 
         /// <summary> Creates a new RPC discord client. </summary>
         public DiscordRpcClient(string clientId, string origin) 
@@ -393,7 +393,7 @@ namespace Discord.Rpc
                                             {
                                                 var response = await ApiClient.SendAuthenticateAsync(options).ConfigureAwait(false);
                                                 CurrentUser = RestSelfUser.Create(this, response.User);
-                                                CurrentApplication = RestApplication.Create(this, response.Application);
+                                                ApplicationInfo = RestApplication.Create(this, response.Application);
                                                 Scopes = response.Scopes;
                                                 TokenExpiresAt = response.Expires;
 
@@ -547,5 +547,8 @@ namespace Discord.Rpc
                 return;
             }
         }
+
+        //IDiscordClient
+        Task<IApplication> IDiscordClient.GetApplicationInfoAsync() => Task.FromResult<IApplication>(ApplicationInfo);
     }
 }

src/Discord.Net.WebSocket/DiscordSocketClient.cs

@@ -38,7 +38,7 @@ namespace Discord.WebSocket
         private int _nextAudioId;
         private bool _canReconnect;
         private DateTimeOffset? _statusSince;
-        private RestApplication _application;
+        private RestApplication _applicationInfo;
 
         /// <summary> Gets the shard of of this client. </summary>
         public int ShardId { get; }
@@ -124,6 +124,7 @@ namespace Discord.WebSocket
             if (ConnectionState != ConnectionState.Disconnected)
                 await DisconnectInternalAsync(null, false).ConfigureAwait(false);
 
+            _applicationInfo = null;
             _voiceRegions = ImmutableDictionary.Create<string, RestVoiceRegion>();
         }
         
@@ -336,7 +337,7 @@ namespace Discord.WebSocket
         /// <inheritdoc />
         public async Task<RestApplication> GetApplicationInfoAsync()
         { 
-            return _application ?? (_application = await ClientHelper.GetApplicationInfoAsync(this));
+            return _applicationInfo ?? (_applicationInfo = await ClientHelper.GetApplicationInfoAsync(this));
         }
 
         /// <inheritdoc />