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240 lines
7.9 KiB
C#
240 lines
7.9 KiB
C#
using MediaBrowser.Common.Events;
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using MediaBrowser.Controller.Net;
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using MediaBrowser.Model.Logging;
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using System;
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using System.Net.WebSockets;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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using WebSocketMessageType = MediaBrowser.Model.Net.WebSocketMessageType;
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using WebSocketState = MediaBrowser.Model.Net.WebSocketState;
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namespace MediaBrowser.Server.Implementations.HttpServer
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{
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/// <summary>
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/// Class NativeWebSocket
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/// </summary>
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public class NativeWebSocket : IWebSocket
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{
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/// <summary>
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/// The logger
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/// </summary>
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private readonly ILogger _logger;
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public event EventHandler<EventArgs> Closed;
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/// <summary>
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/// Gets or sets the web socket.
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/// </summary>
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/// <value>The web socket.</value>
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private System.Net.WebSockets.WebSocket WebSocket { get; set; }
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private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
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/// <summary>
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/// Initializes a new instance of the <see cref="NativeWebSocket" /> class.
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/// </summary>
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/// <param name="socket">The socket.</param>
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/// <param name="logger">The logger.</param>
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/// <exception cref="System.ArgumentNullException">socket</exception>
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public NativeWebSocket(WebSocket socket, ILogger logger)
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{
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if (socket == null)
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{
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throw new ArgumentNullException("socket");
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}
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if (logger == null)
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{
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throw new ArgumentNullException("logger");
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}
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_logger = logger;
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WebSocket = socket;
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Receive();
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}
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/// <summary>
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/// Gets or sets the state.
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/// </summary>
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/// <value>The state.</value>
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public WebSocketState State
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{
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get
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{
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WebSocketState commonState;
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if (!Enum.TryParse(WebSocket.State.ToString(), true, out commonState))
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{
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_logger.Warn("Unrecognized WebSocketState: {0}", WebSocket.State.ToString());
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}
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return commonState;
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}
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}
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/// <summary>
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/// Receives this instance.
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/// </summary>
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private async void Receive()
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{
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while (true)
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{
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byte[] bytes;
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try
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{
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bytes = await ReceiveBytesAsync(_cancellationTokenSource.Token).ConfigureAwait(false);
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}
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catch (OperationCanceledException)
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{
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break;
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}
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catch (WebSocketException ex)
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{
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_logger.ErrorException("Error receiving web socket message", ex);
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break;
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}
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if (bytes == null)
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{
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// Connection closed
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EventHelper.FireEventIfNotNull(Closed, this, EventArgs.Empty, _logger);
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break;
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}
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if (OnReceiveBytes != null)
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{
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OnReceiveBytes(bytes);
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}
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}
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}
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/// <summary>
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/// Receives the async.
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/// </summary>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task{WebSocketMessageInfo}.</returns>
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/// <exception cref="System.Net.WebSockets.WebSocketException">Connection closed</exception>
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private async Task<byte[]> ReceiveBytesAsync(CancellationToken cancellationToken)
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{
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var bytes = new byte[4096];
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var buffer = new ArraySegment<byte>(bytes);
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var result = await WebSocket.ReceiveAsync(buffer, cancellationToken).ConfigureAwait(false);
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if (result.CloseStatus.HasValue)
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{
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_logger.Info("Web socket connection closed by client. Reason: {0}", result.CloseStatus.Value);
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return null;
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}
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return buffer.Array;
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}
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/// <summary>
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/// Sends the async.
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/// </summary>
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/// <param name="bytes">The bytes.</param>
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/// <param name="type">The type.</param>
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/// <param name="endOfMessage">if set to <c>true</c> [end of message].</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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public Task SendAsync(byte[] bytes, WebSocketMessageType type, bool endOfMessage, CancellationToken cancellationToken)
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{
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System.Net.WebSockets.WebSocketMessageType nativeType;
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if (!Enum.TryParse(type.ToString(), true, out nativeType))
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{
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_logger.Warn("Unrecognized WebSocketMessageType: {0}", type.ToString());
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}
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var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _cancellationTokenSource.Token);
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return WebSocket.SendAsync(new ArraySegment<byte>(bytes), nativeType, true, linkedTokenSource.Token);
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}
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public Task SendAsync(byte[] bytes, bool endOfMessage, CancellationToken cancellationToken)
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{
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var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _cancellationTokenSource.Token);
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return WebSocket.SendAsync(new ArraySegment<byte>(bytes), System.Net.WebSockets.WebSocketMessageType.Binary, true, linkedTokenSource.Token);
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}
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public Task SendAsync(string text, bool endOfMessage, CancellationToken cancellationToken)
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{
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var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _cancellationTokenSource.Token);
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var bytes = Encoding.UTF8.GetBytes(text);
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return WebSocket.SendAsync(new ArraySegment<byte>(bytes), System.Net.WebSockets.WebSocketMessageType.Text, true, linkedTokenSource.Token);
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}
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/// <summary>
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/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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}
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/// <summary>
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/// Releases unmanaged and - optionally - managed resources.
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/// </summary>
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/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
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protected virtual void Dispose(bool dispose)
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{
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if (dispose)
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{
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_cancellationTokenSource.Cancel();
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WebSocket.Dispose();
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}
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}
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/// <summary>
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/// Gets or sets the receive action.
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/// </summary>
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/// <value>The receive action.</value>
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public Action<byte[]> OnReceiveBytes { get; set; }
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/// <summary>
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/// Gets or sets the on receive.
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/// </summary>
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/// <value>The on receive.</value>
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public Action<string> OnReceive { get; set; }
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/// <summary>
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/// The _supports native web socket
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/// </summary>
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private static bool? _supportsNativeWebSocket;
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/// <summary>
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/// Gets a value indicating whether [supports web sockets].
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/// </summary>
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/// <value><c>true</c> if [supports web sockets]; otherwise, <c>false</c>.</value>
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public static bool IsSupported
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{
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get
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{
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if (!_supportsNativeWebSocket.HasValue)
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{
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try
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{
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new ClientWebSocket();
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_supportsNativeWebSocket = true;
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}
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catch (PlatformNotSupportedException)
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{
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_supportsNativeWebSocket = false;
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}
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}
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return _supportsNativeWebSocket.Value;
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}
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}
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}
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}
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