From c49539cbe0152d23d82d7710ff2bc32e5d3d187b Mon Sep 17 00:00:00 2001
From: Patrick Barron <barronpm@gmail.com>
Date: Thu, 21 Dec 2023 12:20:30 -0500
Subject: Move ProgressiveFileStream to Controller

---
 .../Streaming/ProgressiveFileStream.cs             | 182 +++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 MediaBrowser.Controller/Streaming/ProgressiveFileStream.cs

(limited to 'MediaBrowser.Controller/Streaming/ProgressiveFileStream.cs')

diff --git a/MediaBrowser.Controller/Streaming/ProgressiveFileStream.cs b/MediaBrowser.Controller/Streaming/ProgressiveFileStream.cs
new file mode 100644
index 000000000..f44dc92d7
--- /dev/null
+++ b/MediaBrowser.Controller/Streaming/ProgressiveFileStream.cs
@@ -0,0 +1,182 @@
+using System;
+using System.Diagnostics;
+using System.IO;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Controller.MediaEncoding;
+using MediaBrowser.Model.IO;
+
+namespace MediaBrowser.Controller.Streaming;
+
+/// <summary>
+/// A progressive file stream for transferring transcoded files as they are written to.
+/// </summary>
+public class ProgressiveFileStream : Stream
+{
+    private readonly Stream _stream;
+    private readonly TranscodingJob? _job;
+    private readonly ITranscodeManager? _transcodeManager;
+    private readonly int _timeoutMs;
+    private bool _disposed;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ProgressiveFileStream"/> class.
+    /// </summary>
+    /// <param name="filePath">The path to the transcoded file.</param>
+    /// <param name="job">The transcoding job information.</param>
+    /// <param name="transcodeManager">The transcode manager.</param>
+    /// <param name="timeoutMs">The timeout duration in milliseconds.</param>
+    public ProgressiveFileStream(string filePath, TranscodingJob? job, ITranscodeManager transcodeManager, int timeoutMs = 30000)
+    {
+        _job = job;
+        _transcodeManager = transcodeManager;
+        _timeoutMs = timeoutMs;
+
+        _stream = new FileStream(filePath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite, IODefaults.FileStreamBufferSize, FileOptions.Asynchronous | FileOptions.SequentialScan);
+    }
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ProgressiveFileStream"/> class.
+    /// </summary>
+    /// <param name="stream">The stream to progressively copy.</param>
+    /// <param name="timeoutMs">The timeout duration in milliseconds.</param>
+    public ProgressiveFileStream(Stream stream, int timeoutMs = 30000)
+    {
+        _job = null;
+        _transcodeManager = null;
+        _timeoutMs = timeoutMs;
+        _stream = stream;
+    }
+
+    /// <inheritdoc />
+    public override bool CanRead => _stream.CanRead;
+
+    /// <inheritdoc />
+    public override bool CanSeek => false;
+
+    /// <inheritdoc />
+    public override bool CanWrite => false;
+
+    /// <inheritdoc />
+    public override long Length => throw new NotSupportedException();
+
+    /// <inheritdoc />
+    public override long Position
+    {
+        get => throw new NotSupportedException();
+        set => throw new NotSupportedException();
+    }
+
+    /// <inheritdoc />
+    public override void Flush()
+    {
+        // Not supported
+    }
+
+    /// <inheritdoc />
+    public override int Read(byte[] buffer, int offset, int count)
+        => Read(buffer.AsSpan(offset, count));
+
+    /// <inheritdoc />
+    public override int Read(Span<byte> buffer)
+    {
+        int totalBytesRead = 0;
+        var stopwatch = Stopwatch.StartNew();
+
+        while (true)
+        {
+            totalBytesRead += _stream.Read(buffer);
+            if (StopReading(totalBytesRead, stopwatch.ElapsedMilliseconds))
+            {
+                break;
+            }
+
+            Thread.Sleep(50);
+        }
+
+        UpdateBytesWritten(totalBytesRead);
+
+        return totalBytesRead;
+    }
+
+    /// <inheritdoc />
+    public override async Task<int> ReadAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
+        => await ReadAsync(buffer.AsMemory(offset, count), cancellationToken).ConfigureAwait(false);
+
+    /// <inheritdoc />
+    public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
+    {
+        int totalBytesRead = 0;
+        var stopwatch = Stopwatch.StartNew();
+
+        while (true)
+        {
+            totalBytesRead += await _stream.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
+            if (StopReading(totalBytesRead, stopwatch.ElapsedMilliseconds))
+            {
+                break;
+            }
+
+            await Task.Delay(50, cancellationToken).ConfigureAwait(false);
+        }
+
+        UpdateBytesWritten(totalBytesRead);
+
+        return totalBytesRead;
+    }
+
+    /// <inheritdoc />
+    public override long Seek(long offset, SeekOrigin origin)
+        => throw new NotSupportedException();
+
+    /// <inheritdoc />
+    public override void SetLength(long value)
+        => throw new NotSupportedException();
+
+    /// <inheritdoc />
+    public override void Write(byte[] buffer, int offset, int count)
+        => throw new NotSupportedException();
+
+    /// <inheritdoc />
+    protected override void Dispose(bool disposing)
+    {
+        if (_disposed)
+        {
+            return;
+        }
+
+        try
+        {
+            if (disposing)
+            {
+                _stream.Dispose();
+
+                if (_job is not null)
+                {
+                    _transcodeManager?.OnTranscodeEndRequest(_job);
+                }
+            }
+        }
+        finally
+        {
+            _disposed = true;
+            base.Dispose(disposing);
+        }
+    }
+
+    private void UpdateBytesWritten(int totalBytesRead)
+    {
+        if (_job is not null)
+        {
+            _job.BytesDownloaded += totalBytesRead;
+        }
+    }
+
+    private bool StopReading(int bytesRead, long elapsed)
+    {
+        // It should stop reading when anything has been successfully read or if the job has exited
+        // If the job is null, however, it's a live stream and will require user action to close,
+        // but don't keep it open indefinitely if it isn't reading anything
+        return bytesRead > 0 || (_job?.HasExited ?? elapsed >= _timeoutMs);
+    }
+}
-- 
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