Merge pull request #8598 from Neuheit/ipv4fallback
Cody Robibero
2 years ago
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GitHub
commit
e1a30a4aef
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/*
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The MIT License (MIT)
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Copyright (c) .NET Foundation and Contributors
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All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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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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/// <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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// GetAwaiter().GetResult() is used instead of .Result as this results in improved exception handling.
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// The tasks have already been completed.
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// See https://github.com/dotnet/corefx/pull/29792/files#r189415885 for more details.
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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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