static void BackupLogFile(FileReference LogFile, TimeSpan RetentionSpan)
{
string LogPrefix = LogFile.GetFileNameWithoutExtension() + "-backup-";
string LogSuffix = LogFile.GetExtension();
if (FileReference.Exists(LogFile))
{
string Timestamp = FileReference.GetLastWriteTime(LogFile).ToString("yyyy.MM.dd-HH.mm.ss");
string UniqueSuffix = "";
for (int NextSuffixIdx = 2; ; NextSuffixIdx++)
{
FileReference BackupLogFile = FileReference.Combine(LogFile.Directory, String.Format("{0}{1}{2}{3}", LogPrefix, Timestamp, UniqueSuffix, LogSuffix));
if (!FileReference.Exists(BackupLogFile))
{
try
{
FileReference.Move(LogFile, BackupLogFile);
}
catch (Exception Ex)
{
Log.TraceWarning("Unable to backup {0} to {1} ({2})", LogFile, BackupLogFile, Ex.Message);
Log.TraceLog(ExceptionUtils.FormatException(Ex));
}
break;
}
UniqueSuffix = String.Format("_{0}", NextSuffixIdx);
}
}
DateTime DeleteTime = DateTime.UtcNow - RetentionSpan;
foreach (FileInfo File in new DirectoryInfo(LogFile.Directory.FullName).EnumerateFiles(LogPrefix + "*" + LogSuffix))
{
if (File.LastWriteTimeUtc < DeleteTime)
{
File.Delete();
}
}
}