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using System;
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using System.Collections.Generic;
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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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using MediaBrowser.Model.Services;
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using MediaBrowser.Model.System;
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using Microsoft.Extensions.Logging;
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using OperatingSystem = MediaBrowser.Common.System.OperatingSystem;
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namespace MediaBrowser.Api.Playback.Progressive
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{
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public class ProgressiveFileCopier : IAsyncStreamWriter, IHasHeaders
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{
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private readonly IFileSystem _fileSystem;
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private readonly TranscodingJob _job;
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private readonly ILogger _logger;
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private readonly string _path;
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private readonly CancellationToken _cancellationToken;
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private readonly Dictionary<string, string> _outputHeaders;
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private long _bytesWritten = 0;
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public long StartPosition { get; set; }
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public bool AllowEndOfFile = true;
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private readonly IDirectStreamProvider _directStreamProvider;
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public ProgressiveFileCopier(IFileSystem fileSystem, string path, Dictionary<string, string> outputHeaders, TranscodingJob job, ILogger logger, CancellationToken cancellationToken)
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{
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_fileSystem = fileSystem;
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_path = path;
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_outputHeaders = outputHeaders;
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_job = job;
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_logger = logger;
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_cancellationToken = cancellationToken;
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}
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public ProgressiveFileCopier(IDirectStreamProvider directStreamProvider, Dictionary<string, string> outputHeaders, TranscodingJob job, ILogger logger, CancellationToken cancellationToken)
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{
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_directStreamProvider = directStreamProvider;
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_outputHeaders = outputHeaders;
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_job = job;
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_logger = logger;
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_cancellationToken = cancellationToken;
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}
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public IDictionary<string, string> Headers => _outputHeaders;
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private Stream GetInputStream(bool allowAsyncFileRead)
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{
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var fileOptions = FileOptions.SequentialScan;
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if (allowAsyncFileRead)
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{
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fileOptions |= FileOptions.Asynchronous;
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}
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return new FileStream(_path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, IODefaults.FileStreamBufferSize, fileOptions);
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}
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public async Task WriteToAsync(Stream outputStream, CancellationToken cancellationToken)
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{
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cancellationToken = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken, _cancellationToken).Token;
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try
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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 eofCount = 0;
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// use non-async filestream along with read due to https://github.com/dotnet/corefx/issues/6039
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var allowAsyncFileRead = OperatingSystem.Id != OperatingSystemId.Windows;
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using (var inputStream = GetInputStream(allowAsyncFileRead))
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{
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if (StartPosition > 0)
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{
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inputStream.Position = StartPosition;
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}
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while (eofCount < 20 || !AllowEndOfFile)
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{
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int bytesRead;
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if (allowAsyncFileRead)
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{
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bytesRead = await CopyToInternalAsync(inputStream, outputStream, cancellationToken).ConfigureAwait(false);
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}
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else
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{
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bytesRead = await CopyToInternalAsyncWithSyncRead(inputStream, outputStream, cancellationToken).ConfigureAwait(false);
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}
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//var position = fs.Position;
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//_logger.LogDebug("Streamed {0} bytes to position {1} from file {2}", bytesRead, position, path);
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if (bytesRead == 0)
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{
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if (_job == null || _job.HasExited)
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{
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eofCount++;
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}
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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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finally
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{
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if (_job != null)
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{
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ApiEntryPoint.Instance.OnTranscodeEndRequest(_job);
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}
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}
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}
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private async Task<int> CopyToInternalAsyncWithSyncRead(Stream source, Stream destination, CancellationToken cancellationToken)
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{
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var array = new byte[IODefaults.CopyToBufferSize];
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int bytesRead;
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int totalBytesRead = 0;
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while ((bytesRead = source.Read(array, 0, array.Length)) != 0)
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{
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var bytesToWrite = bytesRead;
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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_bytesWritten += bytesRead;
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totalBytesRead += bytesRead;
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if (_job != null)
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{
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_job.BytesDownloaded = Math.Max(_job.BytesDownloaded ?? _bytesWritten, _bytesWritten);
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}
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}
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}
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return totalBytesRead;
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}
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private async Task<int> CopyToInternalAsync(Stream source, Stream destination, CancellationToken cancellationToken)
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{
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var array = new byte[IODefaults.CopyToBufferSize];
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int bytesRead;
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int totalBytesRead = 0;
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while ((bytesRead = await source.ReadAsync(array, 0, array.Length, cancellationToken).ConfigureAwait(false)) != 0)
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{
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var bytesToWrite = bytesRead;
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if (bytesToWrite > 0)
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{
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await destination.WriteAsync(array, 0, Convert.ToInt32(bytesToWrite), cancellationToken).ConfigureAwait(false);
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_bytesWritten += bytesRead;
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totalBytesRead += bytesRead;
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if (_job != null)
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{
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_job.BytesDownloaded = Math.Max(_job.BytesDownloaded ?? _bytesWritten, _bytesWritten);
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}
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}
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}
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return totalBytesRead;
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}
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}
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}
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