mirror of
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84 lines
3.1 KiB
C#
84 lines
3.1 KiB
C#
using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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using MediaBrowser.Controller.Library;
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using MediaBrowser.Model.IO;
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namespace Jellyfin.Api.Helpers
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{
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/// <summary>
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/// Progressive file copier.
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/// </summary>
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public class ProgressiveFileCopier
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{
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private readonly string? _path;
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private readonly IDirectStreamProvider? _directStreamProvider;
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private readonly IStreamHelper _streamHelper;
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/// <summary>
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/// Initializes a new instance of the <see cref="ProgressiveFileCopier"/> class.
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/// </summary>
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/// <param name="streamHelper">Instance of the <see cref="IStreamHelper"/> interface.</param>
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/// <param name="path">Filepath to stream from.</param>
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public ProgressiveFileCopier(IStreamHelper streamHelper, string path)
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{
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_path = path;
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_streamHelper = streamHelper;
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_directStreamProvider = null;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="ProgressiveFileCopier"/> class.
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/// </summary>
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/// <param name="streamHelper">Instance of the <see cref="IStreamHelper"/> interface.</param>
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/// <param name="directStreamProvider">Instance of the <see cref="IDirectStreamProvider"/> interface.</param>
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public ProgressiveFileCopier(IStreamHelper streamHelper, IDirectStreamProvider directStreamProvider)
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{
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_directStreamProvider = directStreamProvider;
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_streamHelper = streamHelper;
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_path = null;
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}
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/// <summary>
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/// Write source stream to output.
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/// </summary>
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/// <param name="outputStream">Output stream.</param>
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/// <param name="cancellationToken">Cancellation token.</param>
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/// <returns>A <see cref="Task"/>.</returns>
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public async Task WriteToAsync(Stream outputStream, CancellationToken cancellationToken)
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{
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if (_directStreamProvider != null)
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{
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await _directStreamProvider.CopyToAsync(outputStream, cancellationToken).ConfigureAwait(false);
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return;
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}
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var fileOptions = FileOptions.SequentialScan;
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// use non-async filestream along with read due to https://github.com/dotnet/corefx/issues/6039
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if (Environment.OSVersion.Platform != PlatformID.Win32NT)
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{
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fileOptions |= FileOptions.Asynchronous;
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}
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await using var inputStream = new FileStream(_path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 4096, fileOptions);
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const int emptyReadLimit = 100;
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var eofCount = 0;
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while (eofCount < emptyReadLimit)
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{
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var bytesRead = await _streamHelper.CopyToAsync(inputStream, outputStream, cancellationToken).ConfigureAwait(false);
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if (bytesRead == 0)
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{
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eofCount++;
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await Task.Delay(100, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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eofCount = 0;
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}
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}
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}
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}
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}
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