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LogCleaner.cs
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LogCleaner.cs
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/*
* Copyright (c) 2020 Proton Technologies AG
*
* This file is part of ProtonVPN.
*
* ProtonVPN is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* ProtonVPN is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ProtonVPN. If not, see <https://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using ProtonVPN.Common.Extensions;
namespace ProtonVPN.Common.Logging
{
public class LogCleaner
{
public static readonly TimeSpan MAXIMUM_FILE_AGE = TimeSpan.FromDays(28);
private readonly ILogger _logger;
public LogCleaner(ILogger logger)
{
_logger = logger;
}
public void Clean(string logPath, int maxFiles)
{
_logger.Info($"[LogCleaner] Checking for log files to be deleted in folder '{logPath}'. The maximum number of files allowed is {maxFiles}.");
IList<FileInfo> files = GetFiles(logPath).ToList();
_logger.Debug($"[LogCleaner] The folder '{logPath}' has {files.Count} files.");
IList<FileInfo> filesToDelete = GetFilesToDelete(files, maxFiles);
DeleteFiles(filesToDelete);
}
private IEnumerable<FileInfo> GetFiles(string path)
{
try
{
var directoryInfo = new DirectoryInfo(path);
return directoryInfo.GetFiles();
}
catch (Exception e) when (e.IsFileAccessException())
{
_logger.Error($"[LogCleaner] An error occurred when reading the files from the log folder '{path}'.", e);
return new FileInfo[0];
}
}
private IList<FileInfo> GetFilesToDelete(IList<FileInfo> files, int maxFiles)
{
IList<FileInfo> filesExceedingLimit = GetFilesExceddingLimit(files, maxFiles);
IList<FileInfo> oldFiles = GetOldFiles(files);
IList<FileInfo> filesToDelete = filesExceedingLimit.Concat(oldFiles).Distinct().ToList();
string fileNamesToDelete = GetFileNames(filesToDelete);
_logger.Info($"[LogCleaner] The folder has {filesToDelete.Count} files to delete.{fileNamesToDelete}");
return filesToDelete;
}
private IList<FileInfo> GetFilesExceddingLimit(IList<FileInfo> files, int maxFiles)
{
IList<FileInfo> filesExceedingLimit = files
.OrderByDescending(LastWriteTime)
.Skip(maxFiles)
.ToList();
string fileNamesExceedingLimit = GetFileNames(filesExceedingLimit);
_logger.Debug($"[LogCleaner] The folder has {filesExceedingLimit.Count} files exceeding the limit of {maxFiles} files.{fileNamesExceedingLimit}");
return filesExceedingLimit;
}
private DateTime LastWriteTime(FileInfo file)
{
try
{
return file.LastWriteTimeUtc;
}
catch (Exception e) when (e.IsFileAccessException() || e is ArgumentOutOfRangeException)
{
_logger.Error(e.Message);
return DateTime.MaxValue;
}
}
private string GetFileNames(IList<FileInfo> files)
{
string fileNames = string.Empty;
if (files.Any())
{
fileNames = $" File names: {string.Join(",", files.Select(fi => fi.Name))}";
}
return fileNames;
}
private IList<FileInfo> GetOldFiles(IList<FileInfo> files)
{
DateTime minimumDate = DateTime.UtcNow.Subtract(MAXIMUM_FILE_AGE);
IList<FileInfo> oldFiles = files.Where(t => LastWriteTime(t) < minimumDate).ToList();
string oldFileNames = GetFileNames(oldFiles);
_logger.Debug($"[LogCleaner] The folder has {oldFiles.Count} old files with a last write date before {minimumDate:O}.{oldFileNames}");
return oldFiles;
}
private void DeleteFiles(IList<FileInfo> files)
{
foreach (FileInfo file in files)
{
DeleteFile(file.FullName);
}
}
private void DeleteFile(string fileName)
{
try
{
File.Delete(fileName);
_logger.Info($"[LogCleaner] Successfully deleted the file '{fileName}'.");
}
catch (Exception e) when (e.IsFileAccessException())
{
_logger.Error($"[LogCleaner] An error occurred when deleting the file '{fileName}'.", e);
}
}
}
}