2013-02-24 19:13:45 -05:00
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Common.Net
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{
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/// <summary>
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/// Class WebSocketConnection
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/// </summary>
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public class WebSocketConnection : IDisposable
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{
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/// <summary>
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/// The _socket
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/// </summary>
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private readonly IWebSocket _socket;
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/// <summary>
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/// The _remote end point
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/// </summary>
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public readonly string RemoteEndPoint;
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/// <summary>
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/// The _cancellation token source
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/// </summary>
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private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
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/// <summary>
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/// The _send semaphore
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/// </summary>
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private readonly SemaphoreSlim _sendSemaphore = new SemaphoreSlim(1,1);
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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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/// <summary>
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/// The _json serializer
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/// </summary>
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private readonly IJsonSerializer _jsonSerializer;
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/// <summary>
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/// Initializes a new instance of the <see cref="WebSocketConnection" /> class.
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/// </summary>
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/// <param name="socket">The socket.</param>
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/// <param name="remoteEndPoint">The remote end point.</param>
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/// <param name="receiveAction">The receive action.</param>
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/// <param name="jsonSerializer">The json serializer.</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 WebSocketConnection(IWebSocket socket, string remoteEndPoint, Action<WebSocketMessageInfo> receiveAction, IJsonSerializer jsonSerializer, 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 (string.IsNullOrEmpty(remoteEndPoint))
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{
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throw new ArgumentNullException("remoteEndPoint");
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}
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if (receiveAction == null)
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{
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throw new ArgumentNullException("receiveAction");
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}
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if (jsonSerializer == null)
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{
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throw new ArgumentNullException("jsonSerializer");
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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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_jsonSerializer = jsonSerializer;
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_socket = socket;
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_socket.OnReceiveDelegate = info => OnReceive(info, receiveAction);
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RemoteEndPoint = remoteEndPoint;
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_logger = logger;
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}
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/// <summary>
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/// Called when [receive].
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/// </summary>
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/// <param name="bytes">The bytes.</param>
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/// <param name="callback">The callback.</param>
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private void OnReceive(byte[] bytes, Action<WebSocketMessageInfo> callback)
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{
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try
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{
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WebSocketMessageInfo info;
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using (var memoryStream = new MemoryStream(bytes))
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{
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info = _jsonSerializer.DeserializeFromStream<WebSocketMessageInfo>(memoryStream);
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}
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info.Connection = this;
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callback(info);
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error processing web socket message", ex);
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}
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}
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/// <summary>
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/// Sends a message asynchronously.
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="message">The message.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.ArgumentNullException">message</exception>
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public Task SendAsync<T>(WebSocketMessage<T> message, CancellationToken cancellationToken)
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{
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if (message == null)
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{
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throw new ArgumentNullException("message");
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}
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var bytes = _jsonSerializer.SerializeToBytes(message);
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return SendAsync(bytes, cancellationToken);
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}
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/// <summary>
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/// Sends a message asynchronously.
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/// </summary>
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/// <param name="buffer">The buffer.</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[] buffer, CancellationToken cancellationToken)
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{
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return SendAsync(buffer, WebSocketMessageType.Text, cancellationToken);
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}
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/// <summary>
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/// Sends a message asynchronously.
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/// </summary>
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/// <param name="buffer">The buffer.</param>
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/// <param name="type">The type.</param>
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/// <param name="cancellationToken">The cancellation token.</param>
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/// <returns>Task.</returns>
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/// <exception cref="System.ArgumentNullException">buffer</exception>
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public async Task SendAsync(byte[] buffer, WebSocketMessageType type, CancellationToken cancellationToken)
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{
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if (buffer == null)
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{
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throw new ArgumentNullException("buffer");
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}
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if (cancellationToken == null)
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{
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throw new ArgumentNullException("cancellationToken");
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}
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cancellationToken.ThrowIfCancellationRequested();
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// Per msdn docs, attempting to send simultaneous messages will result in one failing.
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// This should help us workaround that and ensure all messages get sent
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await _sendSemaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
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try
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{
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await _socket.SendAsync(buffer, type, true, cancellationToken);
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}
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catch (OperationCanceledException)
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{
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_logger.Info("WebSocket message to {0} was cancelled", RemoteEndPoint);
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throw;
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error sending WebSocket message {0}", ex, RemoteEndPoint);
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throw;
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}
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finally
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{
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_sendSemaphore.Release();
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}
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}
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/// <summary>
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/// Gets 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 { return _socket.State; }
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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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GC.SuppressFinalize(this);
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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.Dispose();
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_socket.Dispose();
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}
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}
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}
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/// <summary>
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/// Class WebSocketMessage
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/// </summary>
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/// <typeparam name="T"></typeparam>
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public class WebSocketMessage<T>
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{
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/// <summary>
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/// Gets or sets the type of the message.
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/// </summary>
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/// <value>The type of the message.</value>
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public string MessageType { get; set; }
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/// <summary>
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/// Gets or sets the data.
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/// </summary>
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/// <value>The data.</value>
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public T Data { get; set; }
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}
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/// <summary>
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/// Class WebSocketMessageInfo
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/// </summary>
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public class WebSocketMessageInfo : WebSocketMessage<string>
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{
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/// <summary>
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/// Gets or sets the connection.
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/// </summary>
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/// <value>The connection.</value>
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public WebSocketConnection Connection { get; set; }
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}
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}
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