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+using System.Diagnostics.Metrics;
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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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+
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+/*
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+ Copyright (c) 2021 ppy Pty Ltd <contact@ppy.sh>.
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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
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+ all 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
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+ THE SOFTWARE.
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+*/
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+
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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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+ private const int ConnectionEstablishTimeout = 2000;
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+
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+ /// <summary>
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+ /// Gets a value indicating whether the initial IPv6 check has been performed (to determine whether v6 is available or not).
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+ /// </summary>
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+ private static bool _hasResolvedIPv6Availability;
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+
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+ /// <summary>
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+ /// Gets or sets a value indicating whether IPv6 should be preferred. Value may change based on runtime failures.
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+ /// </summary>
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+ public static bool? UseIPv6 { get; set; } = null;
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+
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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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+ // Until .NET supports an implementation of Happy Eyeballs (https://tools.ietf.org/html/rfc8305#section-2),
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+ // let's make IPv4 fallback work in a simple way. This issue is being tracked at https://github.com/dotnet/runtime/issues/26177
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+ // and expected to be fixed in .NET 6.
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+ if (UseIPv6 == true)
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+ {
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+ try
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+ {
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+ var localToken = cancellationToken;
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+
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+ if (!_hasResolvedIPv6Availability)
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+ {
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+ // to make things move fast, use a very low timeout for the initial ipv6 attempt.
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+ using var quickFailCts = new CancellationTokenSource(ConnectionEstablishTimeout);
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+ using var linkedTokenSource = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, quickFailCts.Token);
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+
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+ localToken = linkedTokenSource.Token;
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+ }
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+
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+ return await AttemptConnection(AddressFamily.InterNetworkV6, context, localToken).ConfigureAwait(false);
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+ }
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+#pragma warning disable CA1031 // Do not catch general exception types
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+ catch
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+#pragma warning restore CA1031 // Do not catch general exception types
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+ {
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+ // very naively fallback to ipv4 permanently for this execution based on the response of the first connection attempt.
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+ // Network manager will reset this value in the case of physical network changes / interruptions.
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+ UseIPv6 = false;
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+ }
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+ finally
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+ {
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+ _hasResolvedIPv6Availability = true;
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+ }
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+ }
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+
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+ // fallback to IPv4.
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+ return await AttemptConnection(AddressFamily.InterNetwork, context, cancellationToken).ConfigureAwait(false);
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+ }
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+
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+ private static async ValueTask<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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+
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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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Neuheit