public void TestArchiveOldLogFiles(string logDirectory, int yearsToSimulate, int filesPerYear)
{
var logDir = new DirectoryInfo(logDirectory);
if (filesPerYear < 10)
{
filesPerYear = 10;
}
else if (filesPerYear > 100)
{
filesPerYear = 100;
}
if (yearsToSimulate > 20)
{
yearsToSimulate = 20;
}
if (!logDir.Exists)
{
try
{
logDir.Create();
}
catch (Exception ex)
{
Assert.Fail("Unable to create missing directory " + logDir.FullName + ": " + ex.Message);
}
}
// Create dummy log files for 2018, starting on March 1
var logFilesCreated = CreateLogFiles(logDir, new DateTime(2018, 3, 1), filesPerYear);
// If it is more than 30 days after March 1 of this year, the FileLogger will move log files into subdirectory 2018
// To avoid duplicates (which leads to filename backups), check for and delete any files that might get moved
// (this also avoids Console messages of the form
// "Backing up identically named old log file: C:\Temp\2018\FileLoggingTester_03-08-2018.txt")
foreach (var logFile in logFilesCreated)
{
var candidateFileToDelete = new FileInfo(Path.Combine(logDir.FullName, "2018", logFile.Name));
if (candidateFileToDelete.Exists)
{
candidateFileToDelete.Delete();
}
}
// Cache the list of old log file directories so we can examine the .zip file for each
var logFileDirs = new List <DirectoryInfo>();
// Create dummy log files for previous years, starting on June 1 of each year
// In addition, delete any old .zip files
for (var i = 1; i <= yearsToSimulate; i++)
{
var oldLogFileYear = 2018 - i;
var logFileStartDate = new DateTime(oldLogFileYear, 6, 1);
var oldLogFilesDir = new DirectoryInfo(Path.Combine(logDir.FullName, oldLogFileYear.ToString()));
var oldLogDirZipFile = new FileInfo(Path.Combine(logDir.FullName, oldLogFileYear + ".zip"));
CreateLogFiles(oldLogFilesDir, logFileStartDate, filesPerYear);
if (oldLogDirZipFile.Exists)
{
oldLogDirZipFile.Delete();
}
logFileDirs.Add(oldLogFilesDir);
System.Threading.Thread.Sleep(1000);
}
FileLogger.ChangeLogFileBaseName(Path.Combine(logDirectory, LOGFILE_BASENAME));
FileLogger.ZipOldLogDirectories = true;
System.Threading.Thread.Sleep(1000);
// Instruct the logger to create .zip files for previous years
FileLogger.ArchiveOldLogFilesNow();
// Assure that the zip files were created and have data
foreach (var oldLogFilesDir in logFileDirs)
{
var zipFileToCheck = new FileInfo(oldLogFilesDir.FullName + ".zip");
if (!zipFileToCheck.Exists)
{
Assert.Fail("Expected .zip file not found: " + zipFileToCheck.FullName);
}
using (var archive = ZipFile.OpenRead(zipFileToCheck.FullName))
{
var fileCountInZip = archive.Entries.Count;
Assert.GreaterOrEqual(fileCountInZip, filesPerYear, "Zip file {0} has fewer than {1} files", zipFileToCheck.FullName, filesPerYear);
Console.WriteLine("{0} has {1} entries", zipFileToCheck.FullName, fileCountInZip);
}
}
FileLogger.FlushPendingMessages();
}