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

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using System;
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using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
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using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller;
using MediaBrowser.Model.ApiClient;
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using MediaBrowser.Model.Events;
using MediaBrowser.Model.Net;
using MediaBrowser.Model.Serialization;
using Microsoft.Extensions.Logging;
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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;
private readonly List<Tuple<string, bool, Func<string, IPEndPoint, Encoding, CancellationToken, Task>>> _responders = new List<Tuple<string, bool, Func<string, IPEndPoint, Encoding, CancellationToken, 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 JellyfinServer?", true, RespondToV2Message);
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}
private void AddMessageResponder(string message, bool isSubstring, Func<string, IPEndPoint, Encoding, CancellationToken, Task> responder)
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{
_responders.Add(new Tuple<string, bool, Func<string, IPEndPoint, Encoding, CancellationToken, 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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var cancellationToken = CancellationToken.None;
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try
{
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await responder.Item2.Item3(responder.Item1, message.RemoteEndPoint, encoding, cancellationToken).ConfigureAwait(false);
}
catch (OperationCanceledException)
{
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error in OnMessageReceived");
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}
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}
}
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private Tuple<string, Tuple<string, bool, Func<string, IPEndPoint, Encoding, CancellationToken, 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;
}
return new Tuple<string, Tuple<string, bool, Func<string, IPEndPoint, Encoding, CancellationToken, Task>>>(text, responder);
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}
private async Task RespondToV2Message(string messageText, IPEndPoint endpoint, Encoding encoding, CancellationToken cancellationToken)
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{
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var parts = messageText.Split('|');
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var localUrl = await _appHost.GetLocalApiUrl(cancellationToken).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, cancellationToken).ConfigureAwait(false);
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if (parts.Length > 1)
{
_appHost.EnableLoopback(parts[1]);
}
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}
else
{
_logger.LogWarning("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 ISocket _udpClient;
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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(() => BeginReceive());
}
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private readonly byte[] _receiveBuffer = new byte[8192];
private void BeginReceive()
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{
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if (_isDisposed)
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{
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return;
}
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try
{
var result = _udpClient.BeginReceive(_receiveBuffer, 0, _receiveBuffer.Length, OnReceiveResult);
if (result.CompletedSynchronously)
{
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OnReceiveResult(result);
}
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}
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catch (ObjectDisposedException)
{
//TODO Investigate and properly fix.
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error receiving udp message");
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}
}
private void OnReceiveResult(IAsyncResult result)
{
if (_isDisposed)
{
return;
}
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try
{
var socketResult = _udpClient.EndReceive(result);
OnMessageReceived(socketResult);
}
catch (ObjectDisposedException)
{
//TODO Investigate and properly fix.
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error receiving udp message");
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}
BeginReceive();
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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.LogError(ex, "Error handling UDP message");
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}
}
/// <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)
{
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_isDisposed = true;
if (_udpClient != null)
{
_udpClient.Dispose();
}
}
}
public async Task SendAsync(byte[] bytes, IPEndPoint remoteEndPoint, CancellationToken cancellationToken)
{
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if (_isDisposed)
{
throw new ObjectDisposedException(GetType().Name);
}
if (bytes == null)
{
throw new ArgumentNullException(nameof(bytes));
}
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if (remoteEndPoint == null)
{
throw new ArgumentNullException(nameof(remoteEndPoint));
}
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try
{
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await _udpClient.SendToAsync(bytes, 0, bytes.Length, remoteEndPoint, cancellationToken).ConfigureAwait(false);
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_logger.LogInformation("Udp message sent to {remoteEndPoint}", remoteEndPoint);
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}
catch (OperationCanceledException)
{
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}
catch (Exception ex)
{
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_logger.LogError(ex, "Error sending message to {remoteEndPoint}", remoteEndPoint);
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}
}
}
}