Remove circular dependency between websocket listeners and manager

Emby.Server.Implementations/HttpServer/WebSocketManager.cs

@@ -2,9 +2,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Net.WebSockets;
 using System.Threading.Tasks;
-using Jellyfin.Data.Events;
 using MediaBrowser.Controller.Net;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Logging;
@@ -13,32 +13,23 @@ namespace Emby.Server.Implementations.HttpServer
 {
     public class WebSocketManager : IWebSocketManager
     {
-        private readonly Lazy<IEnumerable<IWebSocketListener>> _webSocketListeners;
+        private readonly IWebSocketListener[] _webSocketListeners;
         private readonly ILogger<WebSocketManager> _logger;
         private readonly ILoggerFactory _loggerFactory;
 
-        private bool _disposed = false;
-
         public WebSocketManager(
-            Lazy<IEnumerable<IWebSocketListener>> webSocketListeners,
+            IEnumerable<IWebSocketListener> webSocketListeners,
             ILogger<WebSocketManager> logger,
             ILoggerFactory loggerFactory)
         {
-            _webSocketListeners = webSocketListeners;
+            _webSocketListeners = webSocketListeners.ToArray();
             _logger = logger;
             _loggerFactory = loggerFactory;
         }
 
-        public event EventHandler<GenericEventArgs<IWebSocketConnection>> WebSocketConnected;
-
         /// <inheritdoc />
         public async Task WebSocketRequestHandler(HttpContext context)
         {
-            if (_disposed)
-            {
-                return;
-            }
-
             try
             {
                 _logger.LogInformation("WS {IP} request", context.Connection.RemoteIpAddress);
@@ -54,7 +45,13 @@ namespace Emby.Server.Implementations.HttpServer
                     OnReceive = ProcessWebSocketMessageReceived
                 };
 
-                WebSocketConnected?.Invoke(this, new GenericEventArgs<IWebSocketConnection>(connection));
+                var tasks = new Task[_webSocketListeners.Length];
+                for (var i = 0; i < _webSocketListeners.Length; ++i)
+                {
+                    tasks[i] = _webSocketListeners[i].ProcessWebSocketConnectedAsync(connection);
+                }
+
+                await Task.WhenAll(tasks).ConfigureAwait(false);
 
                 await connection.ProcessAsync().ConfigureAwait(false);
                 _logger.LogInformation("WS {IP} closed", context.Connection.RemoteIpAddress);
@@ -75,21 +72,13 @@ namespace Emby.Server.Implementations.HttpServer
         /// <param name="result">The result.</param>
         private Task ProcessWebSocketMessageReceived(WebSocketMessageInfo result)
         {
-            if (_disposed)
-            {
-                return Task.CompletedTask;
-            }
-
-            IEnumerable<Task> GetTasks()
+            var tasks = new Task[_webSocketListeners.Length];
+            for (var i = 0; i < _webSocketListeners.Length; ++i)
             {
-                var listeners = _webSocketListeners.Value;
-                foreach (var x in listeners)
-                {
-                    yield return x.ProcessMessageAsync(result);
-                }
+                tasks[i] = _webSocketListeners[i].ProcessMessageAsync(result);
             }
 
-            return Task.WhenAll(GetTasks());
+            return Task.WhenAll(tasks);
         }
     }
 }

Emby.Server.Implementations/Session/SessionWebSocketListener.cs

@@ -4,7 +4,6 @@ using System.Linq;
 using System.Net.WebSockets;
 using System.Threading;
 using System.Threading.Tasks;
-using Jellyfin.Data.Events;
 using MediaBrowser.Controller.Net;
 using MediaBrowser.Controller.Session;
 using MediaBrowser.Model.Net;
@@ -22,50 +21,48 @@ namespace Emby.Server.Implementations.Session
         /// <summary>
         /// The timeout in seconds after which a WebSocket is considered to be lost.
         /// </summary>
-        public const int WebSocketLostTimeout = 60;
+        private const int WebSocketLostTimeout = 60;
 
         /// <summary>
         /// The keep-alive interval factor; controls how often the watcher will check on the status of the WebSockets.
         /// </summary>
-        public const float IntervalFactor = 0.2f;
+        private const float IntervalFactor = 0.2f;
 
         /// <summary>
         /// The ForceKeepAlive factor; controls when a ForceKeepAlive is sent.
         /// </summary>
-        public const float ForceKeepAliveFactor = 0.75f;
+        private const float ForceKeepAliveFactor = 0.75f;
 
         /// <summary>
-        /// The _session manager.
+        /// Lock used for accesing the KeepAlive cancellation token.
         /// </summary>
-        private readonly ISessionManager _sessionManager;
+        private readonly object _keepAliveLock = new object();
 
         /// <summary>
-        /// The _logger.
+        /// The WebSocket watchlist.
         /// </summary>
-        private readonly ILogger<SessionWebSocketListener> _logger;
-        private readonly ILoggerFactory _loggerFactory;
-
-        private readonly IWebSocketManager _webSocketManager;
+        private readonly HashSet<IWebSocketConnection> _webSockets = new HashSet<IWebSocketConnection>();
 
         /// <summary>
-        /// The KeepAlive cancellation token.
+        /// Lock used for accessing the WebSockets watchlist.
         /// </summary>
-        private CancellationTokenSource _keepAliveCancellationToken;
+        private readonly object _webSocketsLock = new object();
 
         /// <summary>
-        /// Lock used for accesing the KeepAlive cancellation token.
+        /// The _session manager.
         /// </summary>
-        private readonly object _keepAliveLock = new object();
+        private readonly ISessionManager _sessionManager;
 
         /// <summary>
-        /// The WebSocket watchlist.
+        /// The _logger.
         /// </summary>
-        private readonly HashSet<IWebSocketConnection> _webSockets = new HashSet<IWebSocketConnection>();
+        private readonly ILogger<SessionWebSocketListener> _logger;
+        private readonly ILoggerFactory _loggerFactory;
 
         /// <summary>
-        /// Lock used for accesing the WebSockets watchlist.
+        /// The KeepAlive cancellation token.
         /// </summary>
-        private readonly object _webSocketsLock = new object();
+        private CancellationTokenSource _keepAliveCancellationToken;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="SessionWebSocketListener" /> class.
@@ -73,32 +70,42 @@ namespace Emby.Server.Implementations.Session
         /// <param name="logger">The logger.</param>
         /// <param name="sessionManager">The session manager.</param>
         /// <param name="loggerFactory">The logger factory.</param>
-        /// <param name="webSocketManager">The HTTP server.</param>
         public SessionWebSocketListener(
             ILogger<SessionWebSocketListener> logger,
             ISessionManager sessionManager,
-            ILoggerFactory loggerFactory,
-            IWebSocketManager webSocketManager)
+            ILoggerFactory loggerFactory)
         {
             _logger = logger;
             _sessionManager = sessionManager;
             _loggerFactory = loggerFactory;
-            _webSocketManager = webSocketManager;
+        }
 
-            webSocketManager.WebSocketConnected += OnServerManagerWebSocketConnected;
+        /// <inheritdoc />
+        public void Dispose()
+        {
+            StopKeepAlive();
         }
 
-        private async void OnServerManagerWebSocketConnected(object sender, GenericEventArgs<IWebSocketConnection> e)
+        /// <summary>
+        /// Processes the message.
+        /// </summary>
+        /// <param name="message">The message.</param>
+        /// <returns>Task.</returns>
+        public Task ProcessMessageAsync(WebSocketMessageInfo message)
+            => Task.CompletedTask;
+
+        /// <inheritdoc />
+        public async Task ProcessWebSocketConnectedAsync(IWebSocketConnection connection)
         {
-            var session = GetSession(e.Argument.QueryString, e.Argument.RemoteEndPoint.ToString());
+            var session = GetSession(connection.QueryString, connection.RemoteEndPoint.ToString());
             if (session != null)
             {
-                EnsureController(session, e.Argument);
-                await KeepAliveWebSocket(e.Argument).ConfigureAwait(false);
+                EnsureController(session, connection);
+                await KeepAliveWebSocket(connection).ConfigureAwait(false);
             }
             else
             {
-                _logger.LogWarning("Unable to determine session based on query string: {0}", e.Argument.QueryString);
+                _logger.LogWarning("Unable to determine session based on query string: {0}", connection.QueryString);
             }
         }
 
@@ -119,21 +126,6 @@ namespace Emby.Server.Implementations.Session
             return _sessionManager.GetSessionByAuthenticationToken(token, deviceId, remoteEndpoint);
         }
 
-        /// <inheritdoc />
-        public void Dispose()
-        {
-            _webSocketManager.WebSocketConnected -= OnServerManagerWebSocketConnected;
-            StopKeepAlive();
-        }
-
-        /// <summary>
-        /// Processes the message.
-        /// </summary>
-        /// <param name="message">The message.</param>
-        /// <returns>Task.</returns>
-        public Task ProcessMessageAsync(WebSocketMessageInfo message)
-            => Task.CompletedTask;
-
         private void EnsureController(SessionInfo session, IWebSocketConnection connection)
         {
             var controllerInfo = session.EnsureController<WebSocketController>(

Jellyfin.Api/WebSocketListeners/ActivityLogWebSocketListener.cs

@@ -58,7 +58,7 @@ namespace Jellyfin.Api.WebSocketListeners
 
         private void OnEntryCreated(object? sender, GenericEventArgs<ActivityLogEntry> e)
         {
-            SendData(true);
+            SendData(true).GetAwaiter().GetResult();
         }
     }
 }

Jellyfin.Server/CoreAppHost.cs

@@ -82,13 +82,11 @@ namespace Jellyfin.Server
             ServiceCollection.AddSingleton<IUserManager, UserManager>();
             ServiceCollection.AddSingleton<IDisplayPreferencesManager, DisplayPreferencesManager>();
 
-            ServiceCollection.AddScoped<IWebSocketListener, SessionWebSocketListener>();
-            ServiceCollection.AddScoped<IWebSocketListener, ActivityLogWebSocketListener>();
-            ServiceCollection.AddScoped<IWebSocketListener, ScheduledTasksWebSocketListener>();
-            ServiceCollection.AddScoped<IWebSocketListener, SessionInfoWebSocketListener>();
-
-            // TODO fix circular dependency on IWebSocketManager
-            ServiceCollection.AddScoped(serviceProvider => new Lazy<IEnumerable<IWebSocketListener>>(serviceProvider.GetRequiredService<IEnumerable<IWebSocketListener>>));
+            // TODO search the assemblies instead of adding them manually?
+            ServiceCollection.AddSingleton<IWebSocketListener, SessionWebSocketListener>();
+            ServiceCollection.AddSingleton<IWebSocketListener, ActivityLogWebSocketListener>();
+            ServiceCollection.AddSingleton<IWebSocketListener, ScheduledTasksWebSocketListener>();
+            ServiceCollection.AddSingleton<IWebSocketListener, SessionInfoWebSocketListener>();
 
             base.RegisterServices();
         }

MediaBrowser.Controller/Net/BasePeriodicWebSocketListener.cs

@@ -92,6 +92,8 @@ namespace MediaBrowser.Controller.Net
             return Task.CompletedTask;
         }
 
+        public Task ProcessWebSocketConnectedAsync(IWebSocketConnection connection) => Task.CompletedTask;
+
         /// <summary>
         /// Starts sending messages over a web socket.
         /// </summary>

MediaBrowser.Controller/Net/IWebSocketListener.cs

@@ -3,7 +3,7 @@ using System.Threading.Tasks;
 namespace MediaBrowser.Controller.Net
 {
     /// <summary>
-    ///This is an interface for listening to messages coming through a web socket connection.
+    /// Interface for listening to messages coming through a web socket connection.
     /// </summary>
     public interface IWebSocketListener
     {
@@ -13,5 +13,12 @@ namespace MediaBrowser.Controller.Net
         /// <param name="message">The message.</param>
         /// <returns>Task.</returns>
         Task ProcessMessageAsync(WebSocketMessageInfo message);
+
+        /// <summary>
+        /// Processes a new web socket connection.
+        /// </summary>
+        /// <param name="connection">An instance of the <see cref="IWebSocketConnection"/> interface.</param>
+        /// <returns>Task.</returns>
+        Task ProcessWebSocketConnectedAsync(IWebSocketConnection connection);
     }
 }

MediaBrowser.Controller/Net/IWebSocketManager.cs

@@ -1,7 +1,4 @@
-using System;
-using System.Collections.Generic;
 using System.Threading.Tasks;
-using Jellyfin.Data.Events;
 using Microsoft.AspNetCore.Http;
 
 namespace MediaBrowser.Controller.Net
@@ -11,11 +8,6 @@ namespace MediaBrowser.Controller.Net
     /// </summary>
     public interface IWebSocketManager
     {
-        /// <summary>
-        /// Occurs when [web socket connected].
-        /// </summary>
-        event EventHandler<GenericEventArgs<IWebSocketConnection>> WebSocketConnected;
-
         /// <summary>
         /// The HTTP request handler.
         /// </summary>