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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO.Compression;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace LDClient {
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enum LogVerbosity {
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None = 0,
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Exceptions,
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Full
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}
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public enum LogType {
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Info = 0,
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Debug,
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Error
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}
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enum LogFlow {
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Console = 0,
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File
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}
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public abstract class Logger : IDisposable {
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private LogVerbosity _verbosity;
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private LogFlow _logFlow;
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private Queue<Action> _queue = new Queue<Action>();
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private ManualResetEvent _hasNewItems = new ManualResetEvent(false);
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private ManualResetEvent _terminate = new ManualResetEvent(false);
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private ManualResetEvent _waiting = new ManualResetEvent(false);
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private Thread _loggingThread;
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private static readonly Lazy<Logger> _lazyLog = new Lazy<Logger>(()
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=> {
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switch (Program.Config.LogFlowType) {
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case LogFlow.File:
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return new FileLogger();
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case LogFlow.Console:
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default:
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return new ConsoleLogger();
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}
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}
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);
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public static Logger Current => _lazyLog.Value;
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protected Logger() {
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_verbosity = (LogVerbosity)Program.Config.LogVerbosityType;
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_logFlow = (LogFlow)Program.Config.LogFlowType;
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_loggingThread = new Thread(new ThreadStart(ProcessQueue)) { IsBackground = true };
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_loggingThread.Start();
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}
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public void Info(string message) {
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Log(message, LogType.Info);
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}
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public void Debug(string message) {
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Log(message, LogType.Debug);
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}
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public void Error(string message) {
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Log(message, LogType.Error);
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}
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public void Error(Exception e) {
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if (_verbosity != LogVerbosity.None) {
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Log(UnwrapExceptionMessages(e), LogType.Error);
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}
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}
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public override string ToString() => $"Logger settings: [Type: {this.GetType().Name}, Verbosity: {_verbosity}, ";
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protected abstract void CreateLog(string message);
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public void Flush() => _waiting.WaitOne();
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public void Dispose() {
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_terminate.Set();
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_loggingThread.Join();
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}
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protected virtual string ComposeLogRow(string message, LogType logType) =>
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$"[{DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss,fff", CultureInfo.InvariantCulture)} - {logType}] - {message}";
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protected virtual string UnwrapExceptionMessages(Exception ex) {
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if (ex == null)
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return string.Empty;
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return $"{ex}, Inner exception: {UnwrapExceptionMessages(ex.InnerException)} ";
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}
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private void ProcessQueue() {
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while (true) {
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_waiting.Set();
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int i = WaitHandle.WaitAny(new WaitHandle[] { _hasNewItems, _terminate });
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if (i == 1) return;
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_hasNewItems.Reset();
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_waiting.Reset();
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Queue<Action> queueCopy;
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lock (_queue) {
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queueCopy = new Queue<Action>(_queue);
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_queue.Clear();
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}
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foreach (var log in queueCopy) {
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log();
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}
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}
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}
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private void Log(string message, LogType logType) {
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if (string.IsNullOrEmpty(message))
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return;
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var logRow = ComposeLogRow(message, logType);
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System.Diagnostics.Debug.WriteLine(logRow);
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if (_verbosity == LogVerbosity.Full) {
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lock (_queue)
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_queue.Enqueue(() => CreateLog(logRow));
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_hasNewItems.Set();
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}
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}
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}
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class ConsoleLogger : Logger {
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protected override void CreateLog(string message) {
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Console.WriteLine(message);
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}
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}
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class FileLogger : Logger {
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private const string LogFolderName = "logs";
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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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private readonly string logFolderPath = Path.Combine(Path.GetTempPath(), $"ldClient\\{LogFolderName}");
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private bool _logDirExists = false;
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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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}
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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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var fileInfo = new FileInfo(filePath);
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if (fileInfo.Length < _logChunkSize)
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return;
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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).GetFileSystemInfos();
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var chunks = logFolderContent.Where(x => !x.Extension.Equals(".zip", StringComparison.OrdinalIgnoreCase));
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if (chunks.Count() <= _logChunkMaxCount)
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return;
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var archiveFolderInfo = Directory.CreateDirectory(Path.Combine(Path.GetDirectoryName(rotatedPath), $"{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, $"{LogFolderName}_{fileTime}.zip"));
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Directory.Delete(archiveFolderInfo.FullName, true);
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var archives = logFolderContent.Where(x => x.Extension.Equals(".zip", StringComparison.OrdinalIgnoreCase)).ToArray();
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if (archives.Count() <= _logArchiveMaxCount)
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return;
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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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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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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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}
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