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74bd1e40
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Pultak
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using System.IO.Compression;
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namespace LDClient.utils.loggers;
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public class FileLogger : ALogger {
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d7aeccba
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Pultak
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/// <summary>
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/// Folder name for the created log files
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/// </summary>
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Pultak
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private const string LogFolderName = "logs";
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/// <summary>
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/// Base name of the log file
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/// </summary>
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private const string LogFileName = "app_info.log";
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private readonly int _logChunkSize = Program.Config.LogChunkSize;
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private readonly int _logChunkMaxCount = Program.Config.LogChunkMaxCount;
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private readonly int _logArchiveMaxCount = Program.Config.LogArchiveMaxCount;
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private readonly int _logCleanupPeriod = Program.Config.LogCleanupPeriod;
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/// <summary>
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/// Destination folder used to store the created logs and zipped chunks
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/// </summary>
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private const string LogFolderPath = $"ldClient\\{LogFolderName}";
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/// <summary>
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/// Flag that indicates that the log folder is already created
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/// </summary>
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private bool _logDirExists;
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/// <summary>
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/// Creates one entry in the rotating file.
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/// If the current log file is too big, it creates new log file.
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/// If there is too many log files it archives them.
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/// Deletes all archived files that are too old
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/// </summary>
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/// <param name="message">Desired message to be logged<</param>
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protected override void CreateLog(string message) {
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if (!_logDirExists) {
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_logDirExists = Directory.Exists(LogFolderPath);
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if (!_logDirExists) {
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Directory.CreateDirectory(LogFolderPath);
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_logDirExists = true;
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}
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}
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var logFilePath = Path.Combine(LogFolderPath, LogFileName);
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Rotate(logFilePath);
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using var sw = File.AppendText(logFilePath);
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sw.WriteLine(message);
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}
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/// <summary>
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/// Rotates last log file by creating new logging file in the process
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/// </summary>
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/// <param name="filePath">path to the last log file</param>
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private void Rotate(string filePath) {
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if (!File.Exists(filePath)) {
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return;
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}
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var fileInfo = new FileInfo(filePath);
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if (fileInfo.Length < _logChunkSize) {
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return;
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}
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var fileTime = DateTime.Now.ToString("dd-MM-yyyy,hh-mm-ss,fff");
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var rotatedPath = filePath.Replace(".log", $".{fileTime}");
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File.Move(filePath, rotatedPath);
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var folderPath = Path.GetDirectoryName(rotatedPath);
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var logFolderContent = new DirectoryInfo(folderPath ?? string.Empty).GetFileSystemInfos();
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var chunks = logFolderContent.Where(x =>
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!x.Extension.Equals(".zip", StringComparison.OrdinalIgnoreCase));
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if (chunks.Count() <= _logChunkMaxCount) {
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return;
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}
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Archive(chunks, rotatedPath, fileTime, folderPath);
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DeleteOldArchives(logFolderContent);
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}
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/// <summary>
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/// Archives the all the last log files (chunks)
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/// </summary>
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/// <param name="chunks">All log files that will be archived</param>
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/// <param name="rotatedPath">path to the log files, which will be archived</param>
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/// <param name="fileTime">current time stamp in string</param>
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/// <param name="folderPath">path to to the exported archives</param>
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private void Archive(IEnumerable<FileSystemInfo> chunks, string rotatedPath, string fileTime, string? folderPath) {
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var archiveFolderInfo = Directory.CreateDirectory(Path.Combine(Path.GetDirectoryName(rotatedPath) ?? LogFolderPath, $"{LogFolderName}_{fileTime}"));
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foreach (var chunk in chunks) {
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var destination = Path.Combine(archiveFolderInfo.FullName, chunk.Name);
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Directory.Move(chunk.FullName, destination);
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}
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ZipFile.CreateFromDirectory(archiveFolderInfo.FullName, Path.Combine(folderPath ?? LogFolderPath, $"{LogFolderName}_{fileTime}.zip"));
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Directory.Delete(archiveFolderInfo.FullName, true);
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}
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/// <summary>
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/// This function deletes all archives that are too old and exceeds the maximum zip files.
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/// Cleanup period and zip max count can be specified in the configuration file.
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/// </summary>
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/// <param name="logFolderContent">filesystem info of the log folder</param>
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private void DeleteOldArchives(FileSystemInfo[] logFolderContent) {
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var archives = logFolderContent.Where(x => x.Extension.Equals(".zip", StringComparison.OrdinalIgnoreCase)).ToArray();
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if (archives.Length <= _logArchiveMaxCount)
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return;
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//find oldest archive in the folder
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var oldestArchive = archives.OrderBy(x => x.CreationTime).First();
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var cleanupDate = oldestArchive.CreationTime.AddDays(_logCleanupPeriod);
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//is there any file older than specified cleanup cleanup period
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if (DateTime.Compare(cleanupDate, DateTime.Now) <= 0) {
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foreach (var file in logFolderContent) {
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file.Delete();
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}
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} else {
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File.Delete(oldestArchive.FullName);
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}
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}
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public override string ToString() => $"{base.ToString()}, Chunk Size: {_logChunkSize}, Max chunk count: {_logChunkMaxCount}, Max log archive count: {_logArchiveMaxCount}, Cleanup period: {_logCleanupPeriod} days]";
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}
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