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using MediaBrowser.Common.Net;
using MediaBrowser.Model.Logging;
using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
using WebSocketMessageType = MediaBrowser.Model.Net.WebSocketMessageType;
using WebSocketState = MediaBrowser.Model.Net.WebSocketState;
namespace MediaBrowser.Server.Implementations.HttpServer
{
/// <summary>
/// Class NativeWebSocket
/// </summary>
public class NativeWebSocket : IWebSocket
{
/// <summary>
/// The logger
/// </summary>
private readonly ILogger _logger;
/// <summary>
/// Gets or sets the web socket.
/// </summary>
/// <value>The web socket.</value>
private System.Net.WebSockets.WebSocket WebSocket { get; set; }
/// <summary>
/// Initializes a new instance of the <see cref="NativeWebSocket" /> class.
/// </summary>
/// <param name="socket">The socket.</param>
/// <param name="logger">The logger.</param>
/// <exception cref="System.ArgumentNullException">socket</exception>
public NativeWebSocket(System.Net.WebSockets.WebSocket socket, ILogger logger)
{
if (socket == null)
{
throw new ArgumentNullException("socket");
}
if (logger == null)
{
throw new ArgumentNullException("logger");
}
_logger = logger;
WebSocket = socket;
Receive();
}
/// <summary>
/// Gets or sets the state.
/// </summary>
/// <value>The state.</value>
public WebSocketState State
{
get
{
WebSocketState commonState;
if (!Enum.TryParse(WebSocket.State.ToString(), true, out commonState))
{
_logger.Warn("Unrecognized WebSocketState: {0}", WebSocket.State.ToString());
}
return commonState;
}
}
/// <summary>
/// Receives this instance.
/// </summary>
private async void Receive()
{
while (true)
{
byte[] bytes;
try
{
bytes = await ReceiveBytesAsync(CancellationToken.None).ConfigureAwait(false);
}
catch (WebSocketException ex)
{
_logger.ErrorException("Error receiving web socket message", ex);
break;
}
if (bytes == null)
{
// Connection closed
break;
}
if (OnReceiveBytes != null)
{
OnReceiveBytes(bytes);
}
}
}
/// <summary>
/// Receives the async.
/// </summary>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task{WebSocketMessageInfo}.</returns>
/// <exception cref="System.Net.WebSockets.WebSocketException">Connection closed</exception>
private async Task<byte[]> ReceiveBytesAsync(CancellationToken cancellationToken)
{
var bytes = new byte[4096];
var buffer = new ArraySegment<byte>(bytes);
var result = await WebSocket.ReceiveAsync(buffer, cancellationToken).ConfigureAwait(false);
if (result.CloseStatus.HasValue)
{
_logger.Info("Web socket connection closed by client.");
return null;
}
return buffer.Array;
}
/// <summary>
/// Sends the async.
/// </summary>
/// <param name="bytes">The bytes.</param>
/// <param name="type">The type.</param>
/// <param name="endOfMessage">if set to <c>true</c> [end of message].</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
public Task SendAsync(byte[] bytes, WebSocketMessageType type, bool endOfMessage, CancellationToken cancellationToken)
{
System.Net.WebSockets.WebSocketMessageType nativeType;
if (!Enum.TryParse(type.ToString(), true, out nativeType))
{
_logger.Warn("Unrecognized WebSocketMessageType: {0}", type.ToString());
}
return WebSocket.SendAsync(new ArraySegment<byte>(bytes), nativeType, true, cancellationToken);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
}
/// <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)
{
WebSocket.Dispose();
}
}
/// <summary>
/// Gets or sets the receive action.
/// </summary>
/// <value>The receive action.</value>
public Action<byte[]> OnReceiveBytes { get; set; }
/// <summary>
/// Gets or sets the on receive.
/// </summary>
/// <value>The on receive.</value>
public Action<string> OnReceive { get; set; }
}
}
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