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using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Library;
using MediaBrowser.Model.IO;
using MediaBrowser.Model.Services;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Api.LiveTv
{
public class ProgressiveFileCopier : IAsyncStreamWriter, IHasHeaders
{
private readonly IFileSystem _fileSystem;
private readonly ILogger _logger;
private readonly string _path;
private readonly Dictionary<string, string> _outputHeaders;
const int StreamCopyToBufferSize = 81920;
public long StartPosition { get; set; }
public bool AllowEndOfFile = true;
private readonly IDirectStreamProvider _directStreamProvider;
private IStreamHelper _streamHelper;
public ProgressiveFileCopier(IFileSystem fileSystem, IStreamHelper streamHelper, string path, Dictionary<string, string> outputHeaders, ILogger logger)
{
_fileSystem = fileSystem;
_path = path;
_outputHeaders = outputHeaders;
_logger = logger;
_streamHelper = streamHelper;
}
public ProgressiveFileCopier(IDirectStreamProvider directStreamProvider, IStreamHelper streamHelper, Dictionary<string, string> outputHeaders, ILogger logger)
{
_directStreamProvider = directStreamProvider;
_outputHeaders = outputHeaders;
_logger = logger;
_streamHelper = streamHelper;
}
public IDictionary<string, string> Headers => _outputHeaders;
private Stream GetInputStream(bool allowAsyncFileRead)
{
var fileOpenOptions = FileOpenOptions.SequentialScan;
if (allowAsyncFileRead)
{
fileOpenOptions |= FileOpenOptions.Asynchronous;
}
return _fileSystem.GetFileStream(_path, FileOpenMode.Open, FileAccessMode.Read, FileShareMode.ReadWrite, fileOpenOptions);
}
public async Task WriteToAsync(Stream outputStream, CancellationToken cancellationToken)
{
if (_directStreamProvider != null)
{
await _directStreamProvider.CopyToAsync(outputStream, cancellationToken).ConfigureAwait(false);
return;
}
var eofCount = 0;
// use non-async filestream along with read due to https://github.com/dotnet/corefx/issues/6039
var allowAsyncFileRead = true;
using (var inputStream = GetInputStream(allowAsyncFileRead))
{
if (StartPosition > 0)
{
inputStream.Position = StartPosition;
}
var emptyReadLimit = AllowEndOfFile ? 20 : 100;
while (eofCount < emptyReadLimit)
{
int bytesRead;
bytesRead = await _streamHelper.CopyToAsync(inputStream, outputStream, cancellationToken).ConfigureAwait(false);
//var position = fs.Position;
//_logger.LogDebug("Streamed {0} bytes to position {1} from file {2}", bytesRead, position, path);
if (bytesRead == 0)
{
eofCount++;
await Task.Delay(100, cancellationToken).ConfigureAwait(false);
}
else
{
eofCount = 0;
}
}
}
}
}
}
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