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using System.IO;
using System.Net.Http;
using System.Net.Sockets;
using System.Threading;
using System.Threading.Tasks;
namespace Jellyfin.Networking.HappyEyeballs
{
/// <summary>
/// Defines the <see cref="HttpClientExtension"/> class.
///
/// Implementation taken from https://github.com/ppy/osu-framework/pull/4191 .
/// </summary>
public static class HttpClientExtension
{
/// <summary>
/// Gets or sets a value indicating whether the client should use IPv6.
/// </summary>
public static bool UseIPv6 { get; set; } = true;
// Implementation taken from https://github.com/rmkerr/corefx/blob/SocketsHttpHandler_Connect_HappyEyeballs/src/System.Net.Http/src/System/Net/Http/SocketsHttpHandler/ConnectHelper.cs
/// <summary>
/// Implements the httpclient callback method.
/// </summary>
/// <param name="context">The <see cref="SocketsHttpConnectionContext"/> instance.</param>
/// <param name="cancellationToken">The <see cref="CancellationToken"/> instance.</param>
/// <returns>The http steam.</returns>
public static async ValueTask<Stream> OnConnect(SocketsHttpConnectionContext context, CancellationToken cancellationToken)
{
if (!UseIPv6)
{
return await AttemptConnection(AddressFamily.InterNetwork, context, cancellationToken).ConfigureAwait(false);
}
using var cancelIPv6 = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var tryConnectAsyncIPv6 = AttemptConnection(AddressFamily.InterNetworkV6, context, cancelIPv6.Token);
if (await Task.WhenAny(tryConnectAsyncIPv6, Task.Delay(200, cancelIPv6.Token)).ConfigureAwait(false) == tryConnectAsyncIPv6 && tryConnectAsyncIPv6.IsCompletedSuccessfully)
{
cancelIPv6.Cancel();
return tryConnectAsyncIPv6.GetAwaiter().GetResult();
}
using var cancelIPv4 = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var tryConnectAsyncIPv4 = AttemptConnection(AddressFamily.InterNetwork, context, cancelIPv4.Token);
if (await Task.WhenAny(tryConnectAsyncIPv6, tryConnectAsyncIPv4).ConfigureAwait(false) == tryConnectAsyncIPv6)
{
if (tryConnectAsyncIPv6.IsCompletedSuccessfully)
{
cancelIPv4.Cancel();
return tryConnectAsyncIPv6.GetAwaiter().GetResult();
}
return tryConnectAsyncIPv4.GetAwaiter().GetResult();
}
else
{
if (tryConnectAsyncIPv4.IsCompletedSuccessfully)
{
cancelIPv6.Cancel();
return tryConnectAsyncIPv4.GetAwaiter().GetResult();
}
return tryConnectAsyncIPv6.GetAwaiter().GetResult();
}
}
private static async Task<Stream> AttemptConnection(AddressFamily addressFamily, SocketsHttpConnectionContext context, CancellationToken cancellationToken)
{
// The following socket constructor will create a dual-mode socket on systems where IPV6 is available.
var socket = new Socket(addressFamily, SocketType.Stream, ProtocolType.Tcp)
{
// Turn off Nagle's algorithm since it degrades performance in most HttpClient scenarios.
NoDelay = true
};
try
{
await socket.ConnectAsync(context.DnsEndPoint, cancellationToken).ConfigureAwait(false);
// The stream should take the ownership of the underlying socket,
// closing it when it's disposed.
return new NetworkStream(socket, ownsSocket: true);
}
catch
{
socket.Dispose();
throw;
}
}
}
}
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