public void ScrollToSpecificLine()
{
var file = Path.GetTempFileName();
var info = new FileInfo(file);
var textMatch = Observable.Return((string)null);
var autoTailer = new ReplaySubject <ScrollRequest>(1);
autoTailer.OnNext(new ScrollRequest(10, 15));
File.AppendAllLines(file, Enumerable.Range(1, 100).Select(i => $"{i}").ToArray());
using (var tailer = new FileTailer(info, textMatch, autoTailer))
{
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(15, 10));
autoTailer.OnNext(new ScrollRequest(15, 50));
File.Delete(file);
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(50, 15));
}
}
public void AutoTailWithFilter()
{
var file = Path.GetTempFileName();
var info = new FileInfo(file);
var scheduler = new TestScheduler();
var textMatch = Observable.Return((string)"1");
var autoTailer = Observable.Return(new ScrollRequest(10));
File.AppendAllLines(file, Enumerable.Range(1, 100).Select(i => i.ToString()).ToArray());
using (var tailer = new FileTailer(info, textMatch, autoTailer, scheduler))
{
//lines which contain "1"
var expectedLines = Enumerable.Range(1, 100)
.Select(i => i.ToString())
.Where(s => s.Contains("1"))
.Reverse()
.Take(10)
.Reverse()
.Select(int.Parse)
.ToArray();
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(expectedLines);
File.AppendAllLines(file, Enumerable.Range(101, 10).Select(i => i.ToString()));
//lines which contain "1"
expectedLines = Enumerable.Range(1, 110)
.Select(i => i.ToString())
.Where(s => s.Contains("1"))
.Reverse()
.Take(10)
.Reverse()
.Select(int.Parse)
.ToArray();
scheduler.AdvanceByMilliSeconds(250);
File.Delete(file);
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(expectedLines);
}
}
public void AutoTail()
{
var file = Path.GetTempFileName();
var info = new FileInfo(file);
var scheduler = new TestScheduler();
var textMatch = Observable.Return((string)null);
var autoTailer = Observable.Return(new ScrollRequest(10));
File.AppendAllLines(file, Enumerable.Range(1, 100).Select(i => i.ToString()).ToArray());
using (var tailer = new FileTailer(info, textMatch, autoTailer, scheduler))
{
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(91, 10));
File.AppendAllLines(file, Enumerable.Range(101, 10).Select(i => i.ToString()));
scheduler.AdvanceByMilliSeconds(250);
File.Delete(file);
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(101, 10));
}
}
public void AutoTailWithFilter()
{
var file = Path.GetTempFileName();
var info = new FileInfo(file);
var textMatch = Observable.Return("1");
var autoTailer = Observable.Return(new ScrollRequest(10));
File.AppendAllLines(file, Enumerable.Range(1, 100).Select(i => $"{i}").ToArray());
using (var tailer = new FileTailer(info, textMatch, autoTailer))
{
// lines that contain "1"
var expectedLines = Enumerable.Range(1, 100)
.Select(i => $"{i}")
.Where(s => s.Contains("1"))
.Reverse()
.Take(10)
.Select(int.Parse)
.ToArray();
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(expectedLines);
File.AppendAllLines(file, Enumerable.Range(101, 10).Select(i => $"{i}"));
Thread.Sleep(TimeSpan.FromSeconds(1));
File.Delete(file);
// lines that contain "1"
expectedLines = Enumerable.Range(1, 110)
.Select(i => $"{i}")
.Where(s => s.Contains("1"))
.Reverse()
.Take(10)
.Select(int.Parse)
.ToArray();
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(expectedLines);
}
}
public void AutoTail()
{
var file = Path.GetTempFileName();
var info = new FileInfo(file);
var textMatch = Observable.Return((string)null);
var autoTailer = Observable.Return(new ScrollRequest(10));
File.AppendAllLines(file, Enumerable.Range(1, 100).Select(i => $"{i}").ToArray());
using (var tailer = new FileTailer(info, textMatch, autoTailer))
{
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(91, 10));
File.AppendAllLines(file, Enumerable.Range(101, 10).Select(i => $"{i}"));
Thread.Sleep(TimeSpan.FromSeconds(1));
File.Delete(file);
tailer.Lines.Items.Select(l => l.Number).ShouldAllBeEquivalentTo(Enumerable.Range(101, 10));
}
}
public FileTailerViewModel(ILogger logger, ISchedulerProvider schedulerProvider, FileInfo fileInfo)
{
if (logger == null)
{
throw new ArgumentNullException(nameof(logger));
}
if (schedulerProvider == null)
{
throw new ArgumentNullException(nameof(schedulerProvider));
}
if (fileInfo == null)
{
throw new ArgumentNullException(nameof(fileInfo));
}
var filterRequest = this.WhenValueChanged(vm => vm.SearchText).Throttle(TimeSpan.FromMilliseconds(125));
var autoChanged = this.WhenValueChanged(vm => vm.AutoTail);
var scroller = _userScrollRequested
.CombineLatest(autoChanged, (user, auto) =>
{
var mode = AutoTail ? ScrollingMode.Tail : ScrollingMode.User;
return(new ScrollRequest(mode, user.PageSize, user.FirstIndex));
})
.Sample(TimeSpan.FromMilliseconds(150))
.DistinctUntilChanged();
var tailer = new FileTailer(fileInfo, filterRequest, scroller);
//create user display for count line count
var lineCounter = tailer.TotalLines.CombineLatest(tailer.MatchedLines, (total, matched) =>
{
return(total == matched
? $"File has {total.ToString("#,###")} lines"
: $"Showing {matched.ToString("#,###")} of {total.ToString("#,###")} lines");
})
.Subscribe(text => LineCountText = text);
//load lines into observable collection
var loader = tailer.Lines.Connect()
.Transform(line => new LineProxy(line))
.Sort(SortExpressionComparer <LineProxy> .Ascending(proxy => proxy.Number))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data)
.Subscribe(changes => logger.Info($"Rows changed {changes.Adds} adds, {changes.Removes} removed"),
ex => logger.Error(ex, "There is a problem with bind data"));
//monitor matching lines and start index,
var matchedLinesMonitor = tailer.MatchedLines
.Subscribe(matched => MatchedLineCount = matched);
//track first visible index
var firstIndexMonitor = tailer.Lines.Connect()
.QueryWhenChanged(lines => lines.Count == 0 ? 0 : lines.Select(l => l.Index).Min())
.Subscribe(first => FirstIndex = first);
_cleanUp = new CompositeDisposable(tailer,
lineCounter,
loader,
firstIndexMonitor,
matchedLinesMonitor,
Disposable.Create(() =>
{
_userScrollRequested.OnCompleted();
}));
}
public FileTailerViewModel(ILogger logger, ISchedulerProvider schedulerProvider, FileInfo fileInfo)
{
if (logger == null)
{
throw new ArgumentNullException(nameof(logger));
}
if (schedulerProvider == null)
{
throw new ArgumentNullException(nameof(schedulerProvider));
}
if (fileInfo == null)
{
throw new ArgumentNullException(nameof(fileInfo));
}
File = fileInfo.FullName;
AutoTail = true;
var filterRequest = this.WhenValueChanged(vm => vm.SearchText).Throttle(TimeSpan.FromMilliseconds(125));
var autoTail = this.WhenValueChanged(vm => vm.AutoTail)
.CombineLatest(_userScrollRequested, (auto, user) =>
auto
? new ScrollRequest(user.Rows)
: new ScrollRequest(user.Rows, user.FirstIndex + 1))
.DistinctUntilChanged();
var tailer = new FileTailer(fileInfo, filterRequest, autoTail);
var lineCounter = tailer
.TotalLinesCount
.CombineLatest(tailer.MatchedLinesCount, (total, matched) =>
total == matched
? $"File has {total:#,###} lines"
: $"Showing {matched:#,###} of {total:#,###} lines")
.Subscribe(text => LineCountText = text);
// load lines into observable collection
var loader = tailer.Lines.Connect()
.Buffer(TimeSpan.FromMilliseconds(125)).FlattenBufferResult()
.Transform(line => new LineProxy(line))
.Sort(SortExpressionComparer <LineProxy> .Ascending(proxy => proxy.Number))
.ObserveOn(schedulerProvider.MainThread)
.Bind(out _data)
.Do(_ => AutoScroller.ScrollToEnd())
.Subscribe(a => logger.Info(a.Adds.ToString()), ex => logger.Error(ex, "Opps"));
// monitor matching lines and start index
// update local values so the virtual scroll panel can bind to them
var matchedLinesMonitor = tailer.MatchedLinesCount
.Subscribe(matched => MatchedLinesCount = matched);
var firstIndexMonitor = tailer.Lines.Connect()
.QueryWhenChanged(lines =>
{
// use zero based index rather than line number
return(lines.Count == 0 ? 0 : lines.Select(l => l.Number).Min() - 1);
}).Subscribe(first => FirstRow = first - 1);
_cleanup = new CompositeDisposable(
tailer,
lineCounter,
loader,
matchedLinesMonitor,
firstIndexMonitor,
Disposable.Create(() => _userScrollRequested.OnCompleted()));
}
