From 6efd22a3d22f8d87ad17da3a1e47ca26c5bb09f2 Mon Sep 17 00:00:00 2001
From: LukePulverenti <luke.pulverenti@gmail.com>
Date: Tue, 26 Feb 2013 11:10:55 -0500
Subject: added a shutdown api method, font size fix and other decouplings

---
 .../Server/WebSocketConnection.cs                  | 225 +++++++++++++++++++++
 1 file changed, 225 insertions(+)
 create mode 100644 MediaBrowser.Common.Implementations/Server/WebSocketConnection.cs

(limited to 'MediaBrowser.Common.Implementations/Server/WebSocketConnection.cs')

diff --git a/MediaBrowser.Common.Implementations/Server/WebSocketConnection.cs b/MediaBrowser.Common.Implementations/Server/WebSocketConnection.cs
new file mode 100644
index 000000000..b8766523c
--- /dev/null
+++ b/MediaBrowser.Common.Implementations/Server/WebSocketConnection.cs
@@ -0,0 +1,225 @@
+using MediaBrowser.Common.Net;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.Serialization;
+using System;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Common.Implementations.Server
+{
+    /// <summary>
+    /// Class WebSocketConnection
+    /// </summary>
+    public class WebSocketConnection : IWebSocketConnection
+    {
+        /// <summary>
+        /// The _socket
+        /// </summary>
+        private readonly IWebSocket _socket;
+
+        /// <summary>
+        /// The _remote end point
+        /// </summary>
+        public string RemoteEndPoint { get; private set; }
+
+        /// <summary>
+        /// The _cancellation token source
+        /// </summary>
+        private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
+
+        /// <summary>
+        /// The _send semaphore
+        /// </summary>
+        private readonly SemaphoreSlim _sendSemaphore = new SemaphoreSlim(1,1);
+
+        /// <summary>
+        /// The logger
+        /// </summary>
+        private readonly ILogger _logger;
+
+        /// <summary>
+        /// The _json serializer
+        /// </summary>
+        private readonly IJsonSerializer _jsonSerializer;
+
+        /// <summary>
+        /// Gets or sets the receive action.
+        /// </summary>
+        /// <value>The receive action.</value>
+        public Action<WebSocketMessageInfo> OnReceive { get; set; }
+
+        /// <summary>
+        /// Initializes a new instance of the <see cref="WebSocketConnection" /> class.
+        /// </summary>
+        /// <param name="socket">The socket.</param>
+        /// <param name="remoteEndPoint">The remote end point.</param>
+        /// <param name="jsonSerializer">The json serializer.</param>
+        /// <param name="logger">The logger.</param>
+        /// <exception cref="System.ArgumentNullException">socket</exception>
+        public WebSocketConnection(IWebSocket socket, string remoteEndPoint, IJsonSerializer jsonSerializer, ILogger logger)
+        {
+            if (socket == null)
+            {
+                throw new ArgumentNullException("socket");
+            }
+            if (string.IsNullOrEmpty(remoteEndPoint))
+            {
+                throw new ArgumentNullException("remoteEndPoint");
+            }
+            if (jsonSerializer == null)
+            {
+                throw new ArgumentNullException("jsonSerializer");
+            }
+            if (logger == null)
+            {
+                throw new ArgumentNullException("logger");
+            }
+
+            _jsonSerializer = jsonSerializer;
+            _socket = socket;
+            _socket.OnReceiveDelegate = OnReceiveInternal;
+            RemoteEndPoint = remoteEndPoint;
+            _logger = logger;
+        }
+
+        /// <summary>
+        /// Called when [receive].
+        /// </summary>
+        /// <param name="bytes">The bytes.</param>
+        private void OnReceiveInternal(byte[] bytes)
+        {
+            if (OnReceive == null)
+            {
+                return;
+            }
+            try
+            {
+                WebSocketMessageInfo info;
+
+                using (var memoryStream = new MemoryStream(bytes))
+                {
+                    info = (WebSocketMessageInfo)_jsonSerializer.DeserializeFromStream(memoryStream, typeof(WebSocketMessageInfo));
+                }
+
+                info.Connection = this;
+
+                OnReceive(info);
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error processing web socket message", ex);
+            }
+        }
+
+        /// <summary>
+        /// Sends a message asynchronously.
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="message">The message.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        /// <exception cref="System.ArgumentNullException">message</exception>
+        public Task SendAsync<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
+        {
+            if (message == null)
+            {
+                throw new ArgumentNullException("message");
+            }
+
+            var bytes = _jsonSerializer.SerializeToBytes(message);
+
+            return SendAsync(bytes, cancellationToken);
+        }
+
+        /// <summary>
+        /// Sends a message asynchronously.
+        /// </summary>
+        /// <param name="buffer">The buffer.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        public Task SendAsync(byte[] buffer, CancellationToken cancellationToken)
+        {
+            return SendAsync(buffer, WebSocketMessageType.Text, cancellationToken);
+        }
+
+        /// <summary>
+        /// Sends a message asynchronously.
+        /// </summary>
+        /// <param name="buffer">The buffer.</param>
+        /// <param name="type">The type.</param>
+        /// <param name="cancellationToken">The cancellation token.</param>
+        /// <returns>Task.</returns>
+        /// <exception cref="System.ArgumentNullException">buffer</exception>
+        public async Task SendAsync(byte[] buffer, WebSocketMessageType type, CancellationToken cancellationToken)
+        {
+            if (buffer == null)
+            {
+                throw new ArgumentNullException("buffer");
+            }
+
+            if (cancellationToken == null)
+            {
+                throw new ArgumentNullException("cancellationToken");
+            }
+            
+            cancellationToken.ThrowIfCancellationRequested();
+
+            // Per msdn docs, attempting to send simultaneous messages will result in one failing.
+            // This should help us workaround that and ensure all messages get sent
+            await _sendSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
+
+            try
+            {
+                await _socket.SendAsync(buffer, type, true, cancellationToken);
+            }
+            catch (OperationCanceledException)
+            {
+                _logger.Info("WebSocket message to {0} was cancelled", RemoteEndPoint);
+
+                throw;
+            }
+            catch (Exception ex)
+            {
+                _logger.ErrorException("Error sending WebSocket message {0}", ex, RemoteEndPoint);
+
+                throw;
+            }
+            finally
+            {
+                _sendSemaphore.Release();
+            }
+        }
+
+        /// <summary>
+        /// Gets the state.
+        /// </summary>
+        /// <value>The state.</value>
+        public WebSocketState State
+        {
+            get { return _socket.State; }
+        }
+
+        /// <summary>
+        /// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
+        /// </summary>
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        /// <summary>
+        /// Releases unmanaged and - optionally - managed resources.
+        /// </summary>
+        /// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
+        protected virtual void Dispose(bool dispose)
+        {
+            if (dispose)
+            {
+                _cancellationTokenSource.Dispose();
+                _socket.Dispose();
+            }
+        }
+    }
+}
-- 
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