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131 lines
4.1 KiB
131 lines
4.1 KiB
using Ionic.Zlib;
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using System;
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using System.IO;
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using System.Runtime.InteropServices;
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using System.Text;
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namespace IPA.Logging.Printers
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{
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/// <summary>
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/// A <see cref="LogPrinter"/> abstract class that provides the utilities to write to a GZip file.
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/// </summary>
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public abstract class GZFilePrinter : LogPrinter, IDisposable
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{
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[DllImport("Kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
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static extern bool CreateHardLink(
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string lpFileName,
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string lpExistingFileName,
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IntPtr lpSecurityAttributes
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);
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private FileInfo fileInfo;
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/// <summary>
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/// The <see cref="StreamWriter"/> that writes to the GZip file.
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/// </summary>
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protected StreamWriter FileWriter;
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private GZipStream zstream;
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private FileStream fstream;
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/// <summary>
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/// Gets the <see cref="FileInfo"/> for the file to write to without the .gz extension.
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/// </summary>
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/// <returns></returns>
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protected abstract FileInfo GetFileInfo();
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private void InitLog()
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{
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try
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{
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if (fileInfo == null)
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{ // first init
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fileInfo = GetFileInfo();
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var ext = fileInfo.Extension;
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fileInfo = new FileInfo(fileInfo.FullName + ".gz");
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fileInfo.Create().Close();
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var symlink = new FileInfo(Path.Combine(fileInfo.DirectoryName ?? throw new InvalidOperationException(), $"latest{ext}.gz"));
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if (symlink.Exists) symlink.Delete();
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try
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{
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if (!CreateHardLink(symlink.FullName, fileInfo.FullName, IntPtr.Zero))
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{
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var error = Marshal.GetLastWin32Error();
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Logger.log.Error($"Hardlink creation failed ({error})");
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}
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}
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catch (Exception e)
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{
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Logger.log.Error("Error creating latest hardlink!");
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Logger.log.Error(e);
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}
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}
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}
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catch (Exception e)
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{
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Logger.log.Error("Error initializing log!");
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Logger.log.Error(e);
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}
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}
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/// <summary>
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/// Called at the start of any print session.
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/// </summary>
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public sealed override void StartPrint()
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{
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InitLog();
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fstream = fileInfo.Open(FileMode.Append, FileAccess.Write);
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zstream = new GZipStream(fstream, CompressionMode.Compress)
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{
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FlushMode = FlushType.Full
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};
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FileWriter = new StreamWriter(zstream, new UTF8Encoding(false));
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}
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/// <summary>
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/// Called at the end of any print session.
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/// </summary>
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public sealed override void EndPrint()
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{
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FileWriter.Flush();
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zstream.Flush();
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fstream.Flush();
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FileWriter.Close();
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zstream.Close();
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fstream.Close();
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FileWriter.Dispose();
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zstream.Dispose();
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fstream.Dispose();
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}
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/// <summary>
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/// Disposes the file printer.
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/// </summary>
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public void Dispose()
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{
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Dispose(true);
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GC.SuppressFinalize(this);
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}
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/// <summary>
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/// Disposes the file printer.
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/// </summary>
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/// <param name="disposing">does nothing</param>
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protected virtual void Dispose(bool disposing)
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{
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if (disposing)
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{
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FileWriter.Flush();
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zstream.Flush();
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fstream.Flush();
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FileWriter.Close();
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zstream.Close();
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fstream.Close();
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FileWriter.Dispose();
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zstream.Dispose();
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fstream.Dispose();
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}
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}
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}
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}
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