jellyfin/Emby.Server.Implementations/Udp/UdpServer.cs

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using MediaBrowser.Controller;
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using MediaBrowser.Model.ApiClient;
using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
using System;
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using System.Collections.Generic;
using System.Linq;
using System.Text;
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using System.Threading;
using System.Threading.Tasks;
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using MediaBrowser.Model.Events;
using MediaBrowser.Model.Net;
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namespace Emby.Server.Implementations.Udp
{
/// <summary>
/// Provides a Udp Server
/// </summary>
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public class UdpServer : IDisposable
{
/// <summary>
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/// The _logger
/// </summary>
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private readonly ILogger _logger;
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private bool _isDisposed;
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private readonly List<Tuple<string, bool, Func<string, IpEndPointInfo, Encoding, Task>>> _responders = new List<Tuple<string, bool, Func<string, IpEndPointInfo, Encoding, Task>>>();
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private readonly IServerApplicationHost _appHost;
private readonly IJsonSerializer _json;
/// <summary>
/// Initializes a new instance of the <see cref="UdpServer" /> class.
/// </summary>
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public UdpServer(ILogger logger, IServerApplicationHost appHost, IJsonSerializer json, ISocketFactory socketFactory)
{
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_logger = logger;
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_appHost = appHost;
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_json = json;
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_socketFactory = socketFactory;
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AddMessageResponder("who is EmbyServer?", true, RespondToV2Message);
AddMessageResponder("who is MediaBrowserServer_v2?", false, RespondToV2Message);
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}
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private void AddMessageResponder(string message, bool isSubstring, Func<string, IpEndPointInfo, Encoding, Task> responder)
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{
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_responders.Add(new Tuple<string, bool, Func<string, IpEndPointInfo, Encoding, Task>>(message, isSubstring, responder));
}
/// <summary>
/// Raises the <see cref="E:MessageReceived" /> event.
/// </summary>
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private async void OnMessageReceived(GenericEventArgs<SocketReceiveResult> e)
{
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var message = e.Argument;
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var encoding = Encoding.UTF8;
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var responder = GetResponder(message.Buffer, message.ReceivedBytes, encoding);
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if (responder == null)
{
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encoding = Encoding.Unicode;
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responder = GetResponder(message.Buffer, message.ReceivedBytes, encoding);
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}
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if (responder != null)
{
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try
{
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await responder.Item2.Item3(responder.Item1, message.RemoteEndPoint, encoding).ConfigureAwait(false);
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}
catch (Exception ex)
{
_logger.ErrorException("Error in OnMessageReceived", ex);
}
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}
}
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private Tuple<string, Tuple<string, bool, Func<string, IpEndPointInfo, Encoding, Task>>> GetResponder(byte[] buffer, int bytesReceived, Encoding encoding)
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{
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var text = encoding.GetString(buffer, 0, bytesReceived);
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var responder = _responders.FirstOrDefault(i =>
{
if (i.Item2)
{
return text.IndexOf(i.Item1, StringComparison.OrdinalIgnoreCase) != -1;
}
return string.Equals(i.Item1, text, StringComparison.OrdinalIgnoreCase);
});
if (responder == null)
{
return null;
}
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return new Tuple<string, Tuple<string, bool, Func<string, IpEndPointInfo, Encoding, Task>>>(text, responder);
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}
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private async Task RespondToV2Message(string messageText, IpEndPointInfo endpoint, Encoding encoding)
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{
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var parts = messageText.Split('|');
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var localUrl = await _appHost.GetLocalApiUrl().ConfigureAwait(false);
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if (!string.IsNullOrEmpty(localUrl))
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{
var response = new ServerDiscoveryInfo
{
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Address = localUrl,
Id = _appHost.SystemId,
Name = _appHost.FriendlyName
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};
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await SendAsync(encoding.GetBytes(_json.SerializeToString(response)), endpoint).ConfigureAwait(false);
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if (parts.Length > 1)
{
_appHost.EnableLoopback(parts[1]);
}
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}
else
{
_logger.Warn("Unable to respond to udp request because the local ip address could not be determined.");
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}
}
/// <summary>
/// The _udp client
/// </summary>
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private IUdpSocket _udpClient;
private readonly ISocketFactory _socketFactory;
/// <summary>
/// Starts the specified port.
/// </summary>
/// <param name="port">The port.</param>
public void Start(int port)
{
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_udpClient = _socketFactory.CreateUdpSocket(port);
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Task.Run(() => StartListening());
}
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private async void StartListening()
{
while (!_isDisposed)
{
try
{
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var result = await _udpClient.ReceiveAsync().ConfigureAwait(false);
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OnMessageReceived(result);
}
catch (ObjectDisposedException)
{
}
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catch (OperationCanceledException)
{
}
catch (Exception ex)
{
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_logger.ErrorException("Error receiving udp message", ex);
}
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}
}
/// <summary>
/// Called when [message received].
/// </summary>
/// <param name="message">The message.</param>
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private void OnMessageReceived(SocketReceiveResult message)
{
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if (_isDisposed)
{
return;
}
if (message.RemoteEndPoint.Port == 0)
{
return;
}
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try
{
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OnMessageReceived(new GenericEventArgs<SocketReceiveResult>
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{
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Argument = message
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});
}
catch (Exception ex)
{
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_logger.ErrorException("Error handling UDP message", ex);
}
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Stops this instance.
/// </summary>
public void Stop()
{
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_isDisposed = true;
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if (_udpClient != null)
{
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_udpClient.Dispose();
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}
}
/// <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)
{
Stop();
}
}
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public async Task SendAsync(byte[] bytes, IpEndPointInfo remoteEndPoint)
{
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if (_isDisposed)
{
throw new ObjectDisposedException(GetType().Name);
}
if (bytes == null)
{
throw new ArgumentNullException("bytes");
}
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if (remoteEndPoint == null)
{
throw new ArgumentNullException("remoteEndPoint");
}
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try
{
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await _udpClient.SendAsync(bytes, bytes.Length, remoteEndPoint, CancellationToken.None).ConfigureAwait(false);
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_logger.Info("Udp message sent to {0}", remoteEndPoint);
}
catch (Exception ex)
{
_logger.ErrorException("Error sending message to {0}", ex, remoteEndPoint);
}
}
}
}