public long ReadFileInReverseOrder(string fileName, long offSet, LogParserParameters parameters, LogResponse response)
{
ReverseLineReader reader = new ReverseLineReader(fileName, offSet);
long i = 0;
long lastOffset = 0;
var lastLine = "";
foreach (var line in reader)
{
DateTime date = GetDateFromLog(line, parameters);
i += line.Length;
lastLine += line;
if ((date != new DateTime() && date <= parameters.StartTime))
{
return(reader.OffSet - line.Length);
}
}
response.DataScanned += i;
return(0);
}
public void ReadFileInOrder(long offSet, LogParserParameters parameters, Dictionary <string, LogMetrics> logMetricsList, LogResponse response)
{
string fileName = response.LogFile;
double timeSpanInMinutes = parameters.EndTime.Subtract(parameters.StartTime).TotalMinutes;
bool includeLogs = (timeSpanInMinutes <= 10 && timeSpanInMinutes > 0);
long i = 0;
using (Stream stream = File.Open(fileName, FileMode.Open))
{
stream.Seek(offSet, SeekOrigin.Begin);
using (StreamReader reader = new StreamReader(stream))
{
string prevLine = "";
bool first = true;
var prevDate = new DateTime();
var logDate = new DateTime();
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
i += line.Length;
logDate = GetDateFromLog(line, parameters);
if (logDate != new DateTime())
{
if (!string.IsNullOrEmpty(prevLine))
{
AddLogsToResponse(prevDate, prevLine, includeLogs, parameters, logMetricsList, response);
prevLine = line;
}
if (first)
{
prevLine = line;
first = false;
}
prevDate = logDate;
}
else
{
if (!first)
{
prevLine = prevLine + Environment.NewLine + line;
}
;
}
if ((logDate != new DateTime() && logDate > parameters.EndTime))
{
break;
}
}
//reached the end of the file try last line
AddLogsToResponse(prevDate, prevLine, includeLogs, parameters, logMetricsList, response);
}
}
response.DataScanned += i;
}
private void AddLogsToResponse(DateTime prevDate, string prevLine, bool includeLogs,
LogParserParameters parameters, Dictionary <string, LogMetrics> logMetricsList, LogResponse response)
{
var dateLessExceptionStr = RemoveDateFromLog(prevLine).Trim();
if (prevDate >= parameters.StartTime && prevDate <= parameters.EndTime)
{
GetMetricFromLine(prevDate, dateLessExceptionStr, parameters, logMetricsList);
if (!response.ExceptionCount.ContainsKey(dateLessExceptionStr))
{
response.ExceptionCount.Add(dateLessExceptionStr, 0);
}
response.ExceptionCount[dateLessExceptionStr] += 1;
if (includeLogs)
{
response.LinkedLogs.AddLast(prevLine);
}
}
}
