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using IllusionPlugin.Logging;
using Ionic.Zlib;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace IllusionInjector.Logging.Printers
{
public abstract class GZFilePrinter : LogPrinter
{
[DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
static extern bool CreateHardLink(
string lpFileName,
string lpExistingFileName,
IntPtr lpSecurityAttributes
);
[DllImport("Kernel32.dll")]
static extern Int32 GetLastError();
private FileInfo fileInfo;
protected StreamWriter fileWriter;
private GZipStream zstream;
private FileStream fstream;
protected abstract FileInfo GetFileInfo();
private void InitLog()
{
try
{
if (fileInfo == null)
{ // first init
fileInfo = GetFileInfo();
var ext = fileInfo.Extension;
fileInfo = new FileInfo(fileInfo.FullName + ".gz");
fileInfo.Create().Close();
var symlink = new FileInfo(Path.Combine(fileInfo.DirectoryName, $"latest{ext}.gz"));
if (symlink.Exists) symlink.Delete();
try
{
if (!CreateHardLink(symlink.FullName, fileInfo.FullName, IntPtr.Zero))
{
Logger.log.Error($"Hardlink creation failed {GetLastError()}");
}
}
catch (Exception e)
{
Logger.log.Error("Error creating latest hardlink!");
Logger.log.Error(e);
}
}
}
catch (Exception e)
{
Logger.log.Error("Error initializing log!");
Logger.log.Error(e);
}
}
public override sealed void StartPrint()
{
InitLog();
fstream = fileInfo.Open(FileMode.Append, FileAccess.Write);
zstream = new GZipStream(fstream, CompressionMode.Compress)
{
FlushMode = FlushType.Full
};
fileWriter = new StreamWriter(zstream, Encoding.UTF8);
}
public override sealed void EndPrint()
{
fileWriter.Flush();
zstream.Flush();
fstream.Flush();
fileWriter.Close();
zstream.Close();
fstream.Close();
fileWriter.Dispose();
zstream.Dispose();
fstream.Dispose();
}
}
}