85 lines
2.9 KiB
C#
85 lines
2.9 KiB
C#
using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text.RegularExpressions;
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namespace VocaluxeLib.Log.Rolling
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{
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static class LogFileRoller
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{
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public static void RollLogs(string mainLogFile, int numLogsToKeep)
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{
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_DeleteOldLogs(mainLogFile, numLogsToKeep);
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string currentSourceFile = _GenerateRollLogFileName(mainLogFile, numLogsToKeep);
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for (var i = numLogsToKeep; i > 1; i--)
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{
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string currentTargetFile = currentSourceFile;
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currentSourceFile = _GenerateRollLogFileName(mainLogFile, i - 1);
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if (File.Exists(currentSourceFile))
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{
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try
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{
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File.Move(currentSourceFile, currentTargetFile);
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}
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catch (Exception)
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{
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// Cant log anything here as the log isn't initialized yet
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}
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}
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}
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if (File.Exists(mainLogFile))
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{
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try
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{
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if (numLogsToKeep > 0)
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File.Move(mainLogFile, currentSourceFile);
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else
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File.Delete(mainLogFile);
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}
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catch (Exception)
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{
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// Cant log anything here as the log isn't initialized yet
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}
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}
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}
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private static void _DeleteOldLogs(string mainLogFile, int numLogsToKeep)
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{
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Regex r = new Regex($"{Path.GetDirectoryName(mainLogFile)}\\\\{Path.GetFileNameWithoutExtension(mainLogFile)}_([0-9]+){Path.GetExtension(mainLogFile)}", RegexOptions.IgnoreCase);
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IEnumerable<string> logFiles = Directory.EnumerateFiles($"{Path.GetDirectoryName(mainLogFile)}", $"{Path.GetFileNameWithoutExtension(mainLogFile)}*{Path.GetExtension(mainLogFile)}");
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foreach (string file in logFiles)
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{
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Match m = r.Match(file);
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if (m.Success)
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{
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int logNum = -1;
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Int32.TryParse(m.Groups[1].Value, out logNum);
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if (logNum < 0 || logNum > numLogsToKeep - 1)
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{
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try
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{
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File.Delete(file);
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}
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catch (Exception)
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{
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// Cant log anything here as the log isn't initialized yet
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}
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}
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}
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}
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}
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private static string _GenerateRollLogFileName(string mainLogFile, int number)
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{
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return $"{Path.GetDirectoryName(mainLogFile)}\\{Path.GetFileNameWithoutExtension(mainLogFile)}_{number}{Path.GetExtension(mainLogFile)}";
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}
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}
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}
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