Lower the amount of running tasks

Emby.Server.Implementations/HttpServer/HttpListenerHost.cs

@@ -11,7 +11,6 @@ using System.Threading;
 using System.Threading.Tasks;
 using Emby.Server.Implementations.Net;
 using Emby.Server.Implementations.Services;
-using Emby.Server.Implementations.SocketSharp;
 using MediaBrowser.Common.Extensions;
 using MediaBrowser.Common.Net;
 using MediaBrowser.Controller;
@@ -823,19 +822,15 @@ namespace Emby.Server.Implementations.HttpServer
 
             Logger.LogDebug("Websocket message received: {0}", result.MessageType);
 
-            var tasks = _webSocketListeners.Select(i => Task.Run(async () =>
+            IEnumerable<Task> GetTasks()
             {
-                try
-                {
-                    await i.ProcessMessage(result).ConfigureAwait(false);
-                }
-                catch (Exception ex)
+                foreach (var x in _webSocketListeners)
                 {
-                    Logger.LogError(ex, "{0} failed processing WebSocket message {1}", i.GetType().Name, result.MessageType ?? string.Empty);
+                    yield return x.ProcessMessageAsync(result);
                 }
-            }));
+            }
 
-            return Task.WhenAll(tasks);
+            return Task.WhenAll(GetTasks());
         }
 
         public void Dispose()

Emby.Server.Implementations/Session/SessionWebSocketListener.cs

@@ -89,10 +89,8 @@ namespace Emby.Server.Implementations.Session
         /// </summary>
         /// <param name="message">The message.</param>
         /// <returns>Task.</returns>
-        public Task ProcessMessage(WebSocketMessageInfo message)
-        {
-            return Task.CompletedTask;
-        }
+        public Task ProcessMessageAsync(WebSocketMessageInfo message)
+            => Task.CompletedTask;
 
         private void EnsureController(SessionInfo session, IWebSocketConnection connection)
         {

Emby.Server.Implementations/SocketSharp/RequestMono.cs

@@ -86,8 +86,7 @@ namespace Emby.Server.Implementations.SocketSharp
                     else
                     {
                         // We use a substream, as in 2.x we will support large uploads streamed to disk,
-                        var sub = new HttpPostedFile(e.Filename, e.ContentType, input, e.Start, e.Length);
-                        files[e.Name] = sub;
+                        files[e.Name] = new HttpPostedFile(e.Filename, e.ContentType, input, e.Start, e.Length);
                     }
                 }
             }
@@ -374,7 +373,7 @@ namespace Emby.Server.Implementations.SocketSharp
 
                 var elem = new Element();
                 ReadOnlySpan<char> header;
-                while ((header = ReadHeaders().AsSpan()) != null)
+                while ((header = ReadLine().AsSpan()).Length != 0)
                 {
                     if (header.StartsWith("Content-Disposition:".AsSpan(), StringComparison.OrdinalIgnoreCase))
                     {
@@ -513,17 +512,6 @@ namespace Emby.Server.Implementations.SocketSharp
                 return false;
             }
 
-            private string ReadHeaders()
-            {
-                string s = ReadLine();
-                if (s.Length == 0)
-                {
-                    return null;
-                }
-
-                return s;
-            }
-
             private static bool CompareBytes(byte[] orig, byte[] other)
             {
                 for (int i = orig.Length - 1; i >= 0; i--)

Emby.Server.Implementations/SocketSharp/WebSocketSharpRequest.cs

@@ -3,8 +3,8 @@ using System.Collections.Generic;
 using System.Globalization;
 using System.IO;
 using System.Net;
+using System.Linq;
 using System.Text;
-using MediaBrowser.Model.Services;
 using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Http.Extensions;
 using Microsoft.Extensions.Logging;
@@ -474,27 +474,28 @@ namespace Emby.Server.Implementations.SocketSharp
         {
             get
             {
-                if (httpFiles == null)
+                if (httpFiles != null)
                 {
-                    if (files == null)
-                    {
-                        return httpFiles = Array.Empty<IHttpFile>();
-                    }
+                    return httpFiles;
+                }
 
-                    httpFiles = new IHttpFile[files.Count];
-                    var i = 0;
-                    foreach (var pair in files)
+                if (files == null)
+                {
+                    return httpFiles = Array.Empty<IHttpFile>();
+                }
+
+                var values = files.Values;
+                httpFiles = new IHttpFile[values.Count];
+                for (int i = 0; i < values.Count; i++)
+                {
+                    var reqFile = values.ElementAt(i);
+                    httpFiles[i] = new HttpFile
                     {
-                        var reqFile = pair.Value;
-                        httpFiles[i] = new HttpFile
-                        {
-                            ContentType = reqFile.ContentType,
-                            ContentLength = reqFile.ContentLength,
-                            FileName = reqFile.FileName,
-                            InputStream = reqFile.InputStream,
-                        };
-                        i++;
-                    }
+                        ContentType = reqFile.ContentType,
+                        ContentLength = reqFile.ContentLength,
+                        FileName = reqFile.FileName,
+                        InputStream = reqFile.InputStream,
+                    };
                 }
 
                 return httpFiles;

Jellyfin.Server/Program.cs

@@ -37,7 +37,7 @@ namespace Jellyfin.Server
         private static bool _restartOnShutdown;
         private static IConfiguration appConfig;
 
-        public static async Task Main(string[] args)
+        public static Task Main(string[] args)
         {
             // For backwards compatibility.
             // Modify any input arguments now which start with single-hyphen to POSIX standard
@@ -51,8 +51,8 @@ namespace Jellyfin.Server
             }
 
             // Parse the command line arguments and either start the app or exit indicating error
-            await Parser.Default.ParseArguments<StartupOptions>(args)
-                .MapResult(StartApp, _ => Task.CompletedTask).ConfigureAwait(false);
+            return Parser.Default.ParseArguments<StartupOptions>(args)
+                .MapResult(StartApp, _ => Task.CompletedTask);
         }
 
         public static void Shutdown()

MediaBrowser.Api/Library/LibraryService.cs

@@ -988,19 +988,16 @@ namespace MediaBrowser.Api.Library
         /// Posts the specified request.
         /// </summary>
         /// <param name="request">The request.</param>
-        public void Post(RefreshLibrary request)
+        public async Task Post(RefreshLibrary request)
         {
-            Task.Run(() =>
+            try
             {
-                try
-                {
-                    _libraryManager.ValidateMediaLibrary(new SimpleProgress<double>(), CancellationToken.None);
-                }
-                catch (Exception ex)
-                {
-                    Logger.LogError(ex, "Error refreshing library");
-                }
-            });
+                await _libraryManager.ValidateMediaLibrary(new SimpleProgress<double>(), CancellationToken.None).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                Logger.LogError(ex, "Error refreshing library");
+            }
         }
 
         /// <summary>

MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs

@@ -57,7 +57,7 @@ namespace MediaBrowser.Controller.Net
         /// </summary>
         /// <param name="message">The message.</param>
         /// <returns>Task.</returns>
-        public Task ProcessMessage(WebSocketMessageInfo message)
+        public Task ProcessMessageAsync(WebSocketMessageInfo message)
         {
             if (message == null)
             {
@@ -74,7 +74,7 @@ namespace MediaBrowser.Controller.Net
                 Stop(message);
             }
 
-            return Task.FromResult(true);
+            return Task.CompletedTask;
         }
 
         protected readonly CultureInfo UsCulture = new CultureInfo("en-US");

MediaBrowser.Controller/Net/IWebSocketListener.cs

@@ -12,6 +12,6 @@ namespace MediaBrowser.Controller.Net
         /// </summary>
         /// <param name="message">The message.</param>
         /// <returns>Task.</returns>
-        Task ProcessMessage(WebSocketMessageInfo message);
+        Task ProcessMessageAsync(WebSocketMessageInfo message);
     }
 }

RSSDP/HttpParserBase.cs

@@ -23,8 +23,6 @@ namespace Rssdp.Infrastructure
 
         #region Public Methods
 
-        private static byte[] EmptyByteArray = new byte[]{};
-
         /// <summary>
         /// Parses the <paramref name="data"/> provided into either a <see cref="HttpRequestMessage"/> or <see cref="HttpResponseMessage"/> object.
         /// </summary>
@@ -46,7 +44,7 @@ namespace Rssdp.Infrastructure
             if (data.Length == 0) throw new ArgumentException("data cannot be an empty string.", nameof(data));
             if (!LineTerminators.Any(data.Contains)) throw new ArgumentException("data is not a valid request, it does not contain any CRLF/LF terminators.", nameof(data));
 
-            using (var retVal = new ByteArrayContent(EmptyByteArray))
+            using (var retVal = new ByteArrayContent(Array.Empty<byte>()))
             {
                 var lines = data.Split(LineTerminators, StringSplitOptions.None);
 
@@ -209,4 +207,4 @@ namespace Rssdp.Infrastructure
         #endregion
 
     }
-}
+}

RSSDP/SsdpCommunicationsServer.cs

@@ -355,7 +355,7 @@ namespace Rssdp.Infrastructure
         {
             var socket = _SocketFactory.CreateUdpMulticastSocket(SsdpConstants.MulticastLocalAdminAddress, _MulticastTtl, SsdpConstants.MulticastPort);
 
-            ListenToSocket(socket);
+            _ = ListenToSocketInternal(socket);
 
             return socket;
         }
@@ -389,19 +389,12 @@ namespace Rssdp.Infrastructure
 
             foreach (var socket in sockets)
             {
-                ListenToSocket(socket);
+                _ = ListenToSocketInternal(socket);
             }
 
             return sockets;
         }
 
-        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1804:RemoveUnusedLocals", MessageId = "t", Justification = "Capturing task to local variable removes compiler warning, task is not otherwise required.")]
-        private void ListenToSocket(ISocket socket)
-        {
-            // Tasks are captured to local variables even if we don't use them just to avoid compiler warnings.
-            var t = Task.Run(() => ListenToSocketInternal(socket));
-        }
-
         private async Task ListenToSocketInternal(ISocket socket)
         {
             var cancelled = false;
@@ -448,10 +441,10 @@ namespace Rssdp.Infrastructure
 
         private void ProcessMessage(string data, IpEndPointInfo endPoint, IpAddressInfo receivedOnLocalIpAddress)
         {
-            //Responses start with the HTTP version, prefixed with HTTP/ while
-            //requests start with a method which can vary and might be one we haven't
-            //seen/don't know. We'll check if this message is a request or a response
-            //by checking for the HTTP/ prefix on the start of the message.
+            // Responses start with the HTTP version, prefixed with HTTP/ while
+            // requests start with a method which can vary and might be one we haven't
+            // seen/don't know. We'll check if this message is a request or a response
+            // by checking for the HTTP/ prefix on the start of the message.
             if (data.StartsWith("HTTP/", StringComparison.OrdinalIgnoreCase))
             {
                 HttpResponseMessage responseMessage = null;
@@ -465,7 +458,9 @@ namespace Rssdp.Infrastructure
                 }
 
                 if (responseMessage != null)
+                {
                     OnResponseReceived(responseMessage, endPoint, receivedOnLocalIpAddress);
+                }
             }
             else
             {