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