public void CompareCurrentWithPrevious()
{
var files = _directoryReader.GetFiles(_directoryReader.GetCurrentDirectory(), "log_*.txt");
if (files.Length < 2)
{
throw new ArgumentOutOfRangeException($"{nameof(files.Length)}={files.Length}", "Not enough log files in the the directory to do a comparison. Expecting 2 or more files.");
}
var mostRecentLog = (from file in files
orderby DateTime.ParseExact(_pathReader.GetFileNameWithoutExtension(file).Replace("log_", ""),
"yyyy_MM_d__HH_mm_ss", CultureInfo.InvariantCulture) descending
select file).Take(1).First();
const string errorKey = "[ERR]";
foreach (var file in files)
{
if (file == mostRecentLog)
{
continue;
}
foreach (var line in _fileReader.ReadAllLines(file))
{
if (line.Contains(errorKey))
{
var indexOf = line.IndexOf(errorKey, StringComparison.Ordinal);
var trimmedLine = line.Remove(0, indexOf + 1 + errorKey.Length).Trim();
_previousScan.Add(trimmedLine);
}
}
}
foreach (var line in _fileReader.ReadAllLines(mostRecentLog))
{
if (line.Contains(errorKey))
{
var indexOf = line.IndexOf(errorKey, StringComparison.Ordinal);
var trimmedLine = line.Remove(0, indexOf + 1 + errorKey.Length).Trim();
_currentScan.Add(trimmedLine);
}
}
_currentScan.ExceptWith(_previousScan);
var totalProblems = 0;
foreach (var line in _currentScan)
{
_logger.Error(line);
totalProblems++;
}
if (totalProblems > 0)
{
_logger.Info($"Total problems found: {totalProblems}.");
}
}
