private async Task AsyncFunctionThatCouldTimeoutUnderHeavyLoad(CancellationToken cancel)
{
AmbientStopwatch stopwatch = new AmbientStopwatch(true);
for (int count = 0; count < 9; ++count)
{
await Task.Delay(100);
cancel.ThrowIfCancellationRequested();
}
// if we finished before getting cancelled, we must have been scheduled within about 10 milliseconds on average, or we must be running using a paused ambient clock
}
internal RequestTracker(RequestType requestType)
{
_requestType = requestType;
_stopwatch = new AmbientStopwatch(true);
requestType.PendingRequests?.Increment();
}
/// <summary>
/// Performs the disk audit, reporting results into <paramref name="statusBuilder"/>.
/// </summary>
/// <param name="statusBuilder">A <see cref="StatusResultsBuilder"/> to write the results into.</param>
/// <param name="cancel">The optional <see cref="CancellationToken"/>.</param>
public async Task Audit(StatusResultsBuilder statusBuilder, CancellationToken cancel = default)
{
statusBuilder.NatureOfSystem = StatusNatureOfSystem.Leaf;
statusBuilder.AddProperty("_Path", _driveInfo.Name);
statusBuilder.AddProperty("_VolumeLabel", _driveInfo.VolumeLabel);
statusBuilder.AddProperty("DriveFormat", _driveInfo.DriveFormat);
statusBuilder.AddProperty("DriveType", _driveInfo.DriveType);
statusBuilder.AddProperty("AvailableFreeBytes", _driveInfo.AvailableFreeSpace);
statusBuilder.AddProperty("TotalFreeBytes", _driveInfo.TotalFreeSpace);
statusBuilder.AddProperty("TotalBytes", _driveInfo.TotalSize);
if (!string.IsNullOrEmpty(_testPath))
{
StatusResultsBuilder readBuilder = new StatusResultsBuilder("Read");
statusBuilder.AddChild(readBuilder);
try
{
// attempt to read a file (if one exists)
foreach (string file in Directory.EnumerateFiles(Path.Combine(_driveInfo.RootDirectory.FullName, _testPath)))
{
AmbientStopwatch s = AmbientStopwatch.StartNew();
try
{
using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
byte[] b = new byte[1];
await fs.ReadAsync(b, 0, 1, cancel);
await fs.FlushAsync();
}
readBuilder.AddProperty("ResponseMs", s.ElapsedMilliseconds);
readBuilder.AddOkay("Ok", "Success", "The read operation succeeded.");
break;
}
catch (IOException) // this will be thrown if the file cannot be accessed because it is open exclusively by another process (this happens a lot with temp files)
{
// just move on and try the next file
continue;
}
}
}
catch (Exception e)
{
readBuilder.AddException(e);
}
if (!_readonly)
{
StatusResultsBuilder writeBuilder = new StatusResultsBuilder("Write");
statusBuilder.AddChild(writeBuilder);
try
{
// attempt to write a temporary file
string targetPath = Path.Combine(_driveInfo.RootDirectory.FullName, Guid.NewGuid().ToString("N"));
AmbientStopwatch s = AmbientStopwatch.StartNew();
using (FileStream fs = new FileStream(targetPath, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read, 4096, FileOptions.DeleteOnClose))
{
byte[] b = new byte[1];
await fs.WriteAsync(b, 0, 1);
await fs.FlushAsync();
readBuilder.AddProperty("ResponseMs", s.ElapsedMilliseconds);
writeBuilder.AddOkay("Ok", "Success", "The write operation succeeded.");
}
}
catch (Exception e)
{
writeBuilder.AddException(e);
}
}
}
}
