private IEnumerable <Line> ReadLinesByIndex(ScrollRequest scroll)
{
var page = GetPage(scroll);
var relativeIndex = CalculateRelativeIndex(page.Start);
if (relativeIndex == null)
{
yield break;
}
var offset = relativeIndex.LinesOffset;
using (var stream = File.Open(Info.FullName, FileMode.Open, FileAccess.Read, FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, Encoding, false))
{
//go to starting point
stream.Seek(relativeIndex.Start, SeekOrigin.Begin);
if (offset > 0)
{
//skip number of lines offset
for (int i = 0; i < offset; i++)
{
reader.ReadLine();
}
}
//if estimate move to the next start of line
if (relativeIndex.IsEstimate && relativeIndex.Start != 0)
{
reader.ReadLine();
}
foreach (var i in Enumerable.Range(page.Start, page.Size))
{
var startPosition = reader.AbsolutePosition();
var line = reader.ReadLine();
var endPosition = reader.AbsolutePosition();
var info = new LineInfo(i + 1, i, startPosition, endPosition);
var ontail = startPosition >= TailInfo.TailStartsAt && DateTime.UtcNow.Subtract(TailInfo.LastTail).TotalSeconds < 1
? DateTime.UtcNow
: (DateTime?)null;
if (!line.StartsWith("{"))
{
yield return(new Line(info, line, ontail));
}
else
{
var data = JsonSerializer.Deserialize <Dictionary <string, object> >(line);
var timestamp = DateTime.Parse(data["@t"].ToString());
string message = data["@mt"].ToString();
var timestampPrefix = timestamp.ToString("[dd/MM/yyyy hh:mm:ss.fff tt] ");
string formattedMessage = SubstituteRegex.Replace(message, match =>
{
var name = match.Groups["exp"].Value;
return(data[name].ToString());
});
if (data.TryGetValue("@x", out var exception) && !string.IsNullOrEmpty(exception.ToString()))
{
yield return(new Line(info, timestampPrefix + formattedMessage + " (" + exception.ToString() + ")", ontail));
}
else
{
yield return(new Line(info, timestampPrefix + formattedMessage, ontail));
}
}
}
}
}
}
private IEnumerable <Line> ReadLinesByIndex(ScrollRequest scroll)
{
var current = this;
var lastValueWrapper = new LastValueWrapper();
var iterationCounter = 0;
var page = GetPage(scroll, current);
var relativeIndex = CalculateRelativeIndex(page.Start, ref current, lastValueWrapper);
while (relativeIndex != null && current != null)
{
if (current.Indicies.Length > 0 && current.Indicies.Any(t => t.Indicies.Count == 0))
{
iterationCounter++;
current = current.Previous as IndexCollection;
continue;
}
if (lastValueWrapper.LastPageIndex == page.Start + page.Size)
{
yield break;
}
var offset = relativeIndex.LinesOffset;
using (
var stream = File.Open(current.Info.FullName, FileMode.Open, FileAccess.Read,
FileShare.Delete | FileShare.ReadWrite))
{
using (var reader = new StreamReaderExtended(stream, current.Encoding, false))
{
//go to starting point
stream.Seek((iterationCounter > 0) ? 0 : relativeIndex.Start, SeekOrigin.Begin);
if (iterationCounter == 0 && offset > 0)
{
//skip number of lines offset
for (var i = 0; i < offset; i++)
{
reader.ReadLine();
}
}
//if estimate move to the next start of line
if (iterationCounter == 0 && relativeIndex.IsEstimate && relativeIndex.Start != 0)
{
reader.ReadLine();
}
foreach (
var i in
Enumerable.Range((iterationCounter > 0) ? lastValueWrapper.LastPageIndex : page.Start,
page.Size))
{
if (i == page.Start + page.Size)
{
yield break;
}
var startPosition = reader.AbsolutePosition() + lastValueWrapper.LastEndPosition;
var line = reader.ReadLine();
var endPosition = reader.AbsolutePosition() + lastValueWrapper.LastEndPosition;
var info = new LineInfo(i + 1, i, startPosition, endPosition);
var ontail = startPosition >= current.TailInfo.TailStartsAt &&
DateTime.Now.Subtract(current.TailInfo.LastTail).TotalSeconds < 1
? DateTime.Now
: (DateTime?)null;
yield return(new Line(info, line, ontail));
lastValueWrapper.LastPageIndex = i + 1;
if (reader.EndOfStream)
{
lastValueWrapper.LastEndPosition += endPosition + 1;
break;
}
}
}
}
iterationCounter++;
current = current.Previous as IndexCollection;
}
}
