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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Common.Configuration;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.IO;
using Microsoft.Extensions.Logging;
namespace MediaBrowser.Controller.MediaEncoding;
/// <summary>
/// Transcoding segment cleaner.
/// </summary>
public class TranscodingSegmentCleaner : IDisposable
{
private readonly TranscodingJob _job;
private readonly ILogger<TranscodingSegmentCleaner> _logger;
private readonly IConfigurationManager _config;
private readonly IFileSystem _fileSystem;
private readonly IMediaEncoder _mediaEncoder;
private Timer? _timer;
private int _segmentLength;
/// <summary>
/// Initializes a new instance of the <see cref="TranscodingSegmentCleaner"/> class.
/// </summary>
/// <param name="job">Transcoding job dto.</param>
/// <param name="logger">Instance of the <see cref="ILogger{TranscodingSegmentCleaner}"/> interface.</param>
/// <param name="config">Instance of the <see cref="IConfigurationManager"/> interface.</param>
/// <param name="fileSystem">Instance of the <see cref="IFileSystem"/> interface.</param>
/// <param name="mediaEncoder">Instance of the <see cref="IMediaEncoder"/> interface.</param>
/// <param name="segmentLength">The segment length of this transcoding job.</param>
public TranscodingSegmentCleaner(TranscodingJob job, ILogger<TranscodingSegmentCleaner> logger, IConfigurationManager config, IFileSystem fileSystem, IMediaEncoder mediaEncoder, int segmentLength)
{
_job = job;
_logger = logger;
_config = config;
_fileSystem = fileSystem;
_mediaEncoder = mediaEncoder;
_segmentLength = segmentLength;
}
/// <summary>
/// Start timer.
/// </summary>
public void Start()
{
_timer = new Timer(TimerCallback, null, 20000, 20000);
}
/// <summary>
/// Stop cleaner.
/// </summary>
public void Stop()
{
DisposeTimer();
}
/// <summary>
/// Dispose cleaner.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
/// <summary>
/// Dispose cleaner.
/// </summary>
/// <param name="disposing">Disposing.</param>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
DisposeTimer();
}
}
private EncodingOptions GetOptions()
{
return _config.GetEncodingOptions();
}
private async void TimerCallback(object? state)
{
if (_job.HasExited)
{
DisposeTimer();
return;
}
var options = GetOptions();
var enableSegmentDeletion = options.EnableSegmentDeletion;
var segmentKeepSeconds = Math.Max(options.SegmentKeepSeconds, 20);
if (enableSegmentDeletion)
{
var downloadPositionTicks = _job.DownloadPositionTicks ?? 0;
var downloadPositionSeconds = Convert.ToInt64(TimeSpan.FromTicks(downloadPositionTicks).TotalSeconds);
if (downloadPositionSeconds > 0 && segmentKeepSeconds > 0 && downloadPositionSeconds > segmentKeepSeconds)
{
var idxMaxToDelete = (downloadPositionSeconds - segmentKeepSeconds) / _segmentLength;
if (idxMaxToDelete > 0)
{
await DeleteSegmentFiles(_job, 0, idxMaxToDelete, 1500).ConfigureAwait(false);
}
}
}
}
private async Task DeleteSegmentFiles(TranscodingJob job, long idxMin, long idxMax, int delayMs)
{
var path = job.Path ?? throw new ArgumentException("Path can't be null.");
_logger.LogDebug("Deleting segment file(s) index {Min} to {Max} from {Path}", idxMin, idxMax, path);
await Task.Delay(delayMs).ConfigureAwait(false);
try
{
if (job.Type == TranscodingJobType.Hls)
{
DeleteHlsSegmentFiles(path, idxMin, idxMax);
}
}
catch (Exception ex)
{
_logger.LogDebug(ex, "Error deleting segment file(s) {Path}", path);
}
}
private void DeleteHlsSegmentFiles(string outputFilePath, long idxMin, long idxMax)
{
var directory = Path.GetDirectoryName(outputFilePath)
?? throw new ArgumentException("Path can't be a root directory.", nameof(outputFilePath));
var name = Path.GetFileNameWithoutExtension(outputFilePath);
var filesToDelete = _fileSystem.GetFilePaths(directory)
.Where(f => long.TryParse(Path.GetFileNameWithoutExtension(f).Replace(name, string.Empty, StringComparison.Ordinal), out var idx)
&& (idx >= idxMin && idx <= idxMax));
List<Exception>? exs = null;
foreach (var file in filesToDelete)
{
try
{
_logger.LogDebug("Deleting HLS segment file {0}", file);
_fileSystem.DeleteFile(file);
}
catch (IOException ex)
{
(exs ??= new List<Exception>()).Add(ex);
_logger.LogDebug(ex, "Error deleting HLS segment file {Path}", file);
}
}
if (exs is not null)
{
throw new AggregateException("Error deleting HLS segment files", exs);
}
}
private void DisposeTimer()
{
if (_timer is not null)
{
_timer.Dispose();
_timer = null;
}
}
}
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