jellyfin/MediaBrowser.Server.Implementations/ServerManager/WebSocketConnection.cs

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using MediaBrowser.Common.Events;
using MediaBrowser.Controller.Net;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Net;
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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;
using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.ServerManager
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{
/// <summary>
/// Class WebSocketConnection
/// </summary>
public class WebSocketConnection : IWebSocketConnection
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{
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public event EventHandler<EventArgs> Closed;
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/// <summary>
/// The _socket
/// </summary>
private readonly IWebSocket _socket;
/// <summary>
/// The _remote end point
/// </summary>
public string RemoteEndPoint { get; private set; }
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/// <summary>
/// The _cancellation token source
/// </summary>
private readonly CancellationTokenSource _cancellationTokenSource = new CancellationTokenSource();
/// <summary>
/// The _send semaphore
/// </summary>
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private readonly SemaphoreSlim _sendSemaphore = new SemaphoreSlim(1, 1);
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/// <summary>
/// The logger
/// </summary>
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private readonly ILogger _logger;
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/// <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; }
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/// <summary>
/// Gets the last activity date.
/// </summary>
/// <value>The last activity date.</value>
public DateTime LastActivityDate { get; private set; }
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/// <summary>
/// Gets the id.
/// </summary>
/// <value>The id.</value>
public Guid Id { get; private set; }
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/// <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>
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/// <param name="jsonSerializer">The json serializer.</param>
/// <param name="logger">The logger.</param>
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/// <exception cref="System.ArgumentNullException">socket</exception>
public WebSocketConnection(IWebSocket socket, string remoteEndPoint, IJsonSerializer jsonSerializer, ILogger logger)
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{
if (socket == null)
{
throw new ArgumentNullException("socket");
}
if (string.IsNullOrEmpty(remoteEndPoint))
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{
throw new ArgumentNullException("remoteEndPoint");
}
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if (jsonSerializer == null)
{
throw new ArgumentNullException("jsonSerializer");
}
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if (logger == null)
{
throw new ArgumentNullException("logger");
}
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Id = Guid.NewGuid();
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_jsonSerializer = jsonSerializer;
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_socket = socket;
_socket.OnReceiveBytes = OnReceiveInternal;
_socket.OnReceive = OnReceiveInternal;
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RemoteEndPoint = remoteEndPoint;
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_logger = logger;
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socket.Closed += socket_Closed;
}
void socket_Closed(object sender, EventArgs e)
{
EventHelper.FireEventIfNotNull(Closed, this, EventArgs.Empty, _logger);
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}
/// <summary>
/// Called when [receive].
/// </summary>
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/// <param name="bytes">The bytes.</param>
private void OnReceiveInternal(byte[] bytes)
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{
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LastActivityDate = DateTime.UtcNow;
if (OnReceive == null)
{
return;
}
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try
{
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WebSocketMessageInfo info;
using (var memoryStream = new MemoryStream(bytes))
{
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var stub = (WebSocketMessage<object>)_jsonSerializer.DeserializeFromStream(memoryStream, typeof(WebSocketMessage<object>));
info = new WebSocketMessageInfo
{
MessageType = stub.MessageType,
Data = stub.Data == null ? null : stub.Data.ToString()
};
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}
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info.Connection = this;
OnReceive(info);
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}
catch (Exception ex)
{
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_logger.ErrorException("Error processing web socket message", ex);
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}
}
private void OnReceiveInternal(string message)
{
LastActivityDate = DateTime.UtcNow;
if (!message.StartsWith("{", StringComparison.OrdinalIgnoreCase))
{
_logger.Error("Received web socket message that is not a json structure: " + message);
return;
}
if (OnReceive == null)
{
return;
}
try
{
var stub = (WebSocketMessage<object>)_jsonSerializer.DeserializeFromString(message, typeof(WebSocketMessage<object>));
var info = new WebSocketMessageInfo
{
MessageType = stub.MessageType,
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Data = stub.Data == null ? null : stub.Data.ToString(),
Connection = this
};
OnReceive(info);
}
catch (Exception ex)
{
_logger.ErrorException("Error processing web socket message", ex);
}
}
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/// <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");
}
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var json = _jsonSerializer.SerializeToString(message);
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return SendAsync(json, cancellationToken);
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}
/// <summary>
/// Sends a message asynchronously.
/// </summary>
/// <param name="buffer">The buffer.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
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public async Task SendAsync(byte[] buffer, CancellationToken cancellationToken)
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{
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if (buffer == null)
{
throw new ArgumentNullException("buffer");
}
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, 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();
}
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}
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public async Task SendAsync(string text, CancellationToken cancellationToken)
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{
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if (string.IsNullOrWhiteSpace(text))
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{
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throw new ArgumentNullException("text");
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}
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
{
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await _socket.SendAsync(text, true, cancellationToken);
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}
catch (OperationCanceledException)
{
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_logger.Info("WebSocket message to {0} was cancelled", RemoteEndPoint);
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throw;
}
catch (Exception ex)
{
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_logger.ErrorException("Error sending WebSocket message {0}", ex, RemoteEndPoint);
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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();
}
}
}
}