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fixing mutex name from constant to dynamic guid #105

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fixing mutex name from constant to dynamic guid #105

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f15b4ae
fixing muteg name from constant to dynamic guid
Oct 31, 2019
cb5df61
reimplement to getting mutex name from app settings
Nov 18, 2019
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283 changes: 142 additions & 141 deletions MediaToolkit src/MediaToolkit/EngineBase.cs
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Original file line number Diff line number Diff line change
@@ -1,144 +1,145 @@
namespace MediaToolkit
{
using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Threading;

using MediaToolkit.Properties;
using MediaToolkit.Util;

public class EngineBase : IDisposable
{
private bool isDisposed;

/// <summary> Used for locking the FFmpeg process to one thread. </summary>
private const string LockName = "MediaToolkit.Engine.LockName";

private const string DefaultFFmpegFilePath = @"/MediaToolkit/ffmpeg.exe";

/// <summary> Full pathname of the FFmpeg file. </summary>
protected readonly string FFmpegFilePath;

/// <summary> The Mutex. </summary>
protected readonly Mutex Mutex;

/// <summary> The ffmpeg process. </summary>
protected Process FFmpegProcess;


protected EngineBase()
: this(ConfigurationManager.AppSettings["mediaToolkit.ffmpeg.path"])
{
}

///-------------------------------------------------------------------------------------------------
/// <summary>
/// <para> Initializes FFmpeg.exe; Ensuring that there is a copy</para>
/// <para> in the clients temp folder &amp; isn't in use by another process.</para>
/// </summary>
protected EngineBase(string ffMpegPath)
{
this.Mutex = new Mutex(false, LockName);
this.isDisposed = false;

if (ffMpegPath.IsNullOrWhiteSpace())
{
ffMpegPath = DefaultFFmpegFilePath;
}

this.FFmpegFilePath = ffMpegPath;

this.EnsureDirectoryExists ();
this.EnsureFFmpegFileExists();
this.EnsureFFmpegIsNotUsed ();
}

private void EnsureFFmpegIsNotUsed()
{
try
{
this.Mutex.WaitOne();
Process.GetProcessesByName(Resources.FFmpegProcessName)
.ForEach(process =>
{
process.Kill();
process.WaitForExit();
});
}
finally
{
this.Mutex.ReleaseMutex();
}
}

private void EnsureDirectoryExists()
{
string directory = Path.GetDirectoryName(this.FFmpegFilePath) ?? Directory.GetCurrentDirectory(); ;

if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
}

private void EnsureFFmpegFileExists()
{
if (!File.Exists(this.FFmpegFilePath))
{
UnpackFFmpegExecutable(this.FFmpegFilePath);
}
}

///-------------------------------------------------------------------------------------------------
/// <summary> Unpack ffmpeg executable. </summary>
/// <exception cref="Exception"> Thrown when an exception error condition occurs. </exception>
private static void UnpackFFmpegExecutable(string path)
{
Stream compressedFFmpegStream = Assembly.GetExecutingAssembly()
.GetManifestResourceStream(Resources.FFmpegManifestResourceName);

if (compressedFFmpegStream == null)
{
throw new Exception(Resources.Exceptions_Null_FFmpeg_Gzip_Stream);
}

using (FileStream fileStream = new FileStream(path, FileMode.Create))
using (GZipStream compressedStream = new GZipStream(compressedFFmpegStream, CompressionMode.Decompress))
{
compressedStream.CopyTo(fileStream);
}
}



///-------------------------------------------------------------------------------------------------
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting
/// unmanaged resources.
/// </summary>
/// <remarks> Aydin Aydin, 30/03/2015. </remarks>
public virtual void Dispose()
{
this.Dispose(true);
}

private void Dispose(bool disposing)
{
if (!disposing || this.isDisposed)
{
return;
}

if(FFmpegProcess != null)
{
this.FFmpegProcess.Dispose();
}
this.FFmpegProcess = null;
this.isDisposed = true;
}
}
using System;
using System.Configuration;
using System.Diagnostics;
using System.IO;
using System.IO.Compression;
using System.Reflection;
using System.Threading;

using MediaToolkit.Properties;
using MediaToolkit.Util;

public class EngineBase : IDisposable
{
private bool isDisposed;

/// <summary> Used for locking the FFmpeg process to one thread. </summary>
private const string LockName = "MediaToolkit.Engine.LockName";

private const string DefaultFFmpegFilePath = @"/MediaToolkit/ffmpeg.exe";

/// <summary> Full pathname of the FFmpeg file. </summary>
protected readonly string FFmpegFilePath;

/// <summary> The Mutex. </summary>
protected readonly Mutex Mutex;

/// <summary> The ffmpeg process. </summary>
protected Process FFmpegProcess;


protected EngineBase()
: this(ConfigurationManager.AppSettings["mediaToolkit.ffmpeg.path"])
{
}

///-------------------------------------------------------------------------------------------------
/// <summary>
/// <para> Initializes FFmpeg.exe; Ensuring that there is a copy</para>
/// <para> in the clients temp folder &amp; isn't in use by another process.</para>
/// </summary>
protected EngineBase(string ffMpegPath)
{
var lockName = $"{LockName}-{ConfigurationManager.AppSettings["mediaToolkit.application.name"]}";
this.Mutex = new Mutex(false, lockName);
this.isDisposed = false;

if (ffMpegPath.IsNullOrWhiteSpace())
{
ffMpegPath = DefaultFFmpegFilePath;
}

this.FFmpegFilePath = ffMpegPath;

this.EnsureDirectoryExists();
this.EnsureFFmpegFileExists();
this.EnsureFFmpegIsNotUsed();
}

private void EnsureFFmpegIsNotUsed()
{
try
{
this.Mutex.WaitOne();
Process.GetProcessesByName(Resources.FFmpegProcessName)
.ForEach(process =>
{
process.Kill();
process.WaitForExit();
});
}
finally
{
this.Mutex.ReleaseMutex();
}
}

private void EnsureDirectoryExists()
{
string directory = Path.GetDirectoryName(this.FFmpegFilePath) ?? Directory.GetCurrentDirectory(); ;

if (!Directory.Exists(directory))
{
Directory.CreateDirectory(directory);
}
}

private void EnsureFFmpegFileExists()
{
if (!File.Exists(this.FFmpegFilePath))
{
UnpackFFmpegExecutable(this.FFmpegFilePath);
}
}

///-------------------------------------------------------------------------------------------------
/// <summary> Unpack ffmpeg executable. </summary>
/// <exception cref="Exception"> Thrown when an exception error condition occurs. </exception>
private static void UnpackFFmpegExecutable(string path)
{
Stream compressedFFmpegStream = Assembly.GetExecutingAssembly()
.GetManifestResourceStream(Resources.FFmpegManifestResourceName);

if (compressedFFmpegStream == null)
{
throw new Exception(Resources.Exceptions_Null_FFmpeg_Gzip_Stream);
}

using (FileStream fileStream = new FileStream(path, FileMode.Create))
using (GZipStream compressedStream = new GZipStream(compressedFFmpegStream, CompressionMode.Decompress))
{
compressedStream.CopyTo(fileStream);
}
}



///-------------------------------------------------------------------------------------------------
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting
/// unmanaged resources.
/// </summary>
/// <remarks> Aydin Aydin, 30/03/2015. </remarks>
public virtual void Dispose()
{
this.Dispose(true);
}

private void Dispose(bool disposing)
{
if (!disposing || this.isDisposed)
{
return;
}

if (FFmpegProcess != null)
{
this.FFmpegProcess.Dispose();
}
this.FFmpegProcess = null;
this.isDisposed = true;
}
}
}