private static void RunNodeJs()
{
const string NodeJsExe = @"C:\Program Files\nodejs\node.exe";
const string JsFilePath = @"C:\Temp\code.js";
const string JsFileWorkingDirectory = @"C:\Temp";
File.WriteAllText(JsFilePath, GlobalConstants.SampleJavaScriptCode);
var process = new RestrictedProcess(NodeJsExe, JsFileWorkingDirectory, new List<string>() { JsFilePath });
process.StandardInput.WriteLine("Vasko" + Environment.NewLine + "Niki2" + Environment.NewLine + "Niki3");
process.Start(1000, 100 * 1024 * 1024);
process.StandardInput.Close();
var output = process.StandardOutput.ReadToEnd();
var error = process.StandardError.ReadToEnd();
Console.WriteLine(output);
Console.WriteLine(error);
Console.WriteLine(process.ExitCode);
}
// TODO: double check and maybe change order of parameters
public ProcessExecutionResult Execute(string fileName, string inputData, int timeLimit, int memoryLimit, IEnumerable<string> executionArguments = null)
{
var result = new ProcessExecutionResult { Type = ProcessExecutionResultType.Success };
var workingDirectory = new FileInfo(fileName).DirectoryName;
using (var restrictedProcess = new RestrictedProcess(fileName, workingDirectory, executionArguments, Math.Max(4096, (inputData.Length * 2) + 4)))
{
// Write to standard input using another thread
restrictedProcess.StandardInput.WriteLineAsync(inputData).ContinueWith(
delegate
{
// ReSharper disable once AccessToDisposedClosure
if (!restrictedProcess.IsDisposed)
{
// ReSharper disable once AccessToDisposedClosure
restrictedProcess.StandardInput.FlushAsync().ContinueWith(
delegate
{
restrictedProcess.StandardInput.Close();
});
}
});
// Read standard output using another thread to prevent process locking (waiting us to empty the output buffer)
var processOutputTask = restrictedProcess.StandardOutput.ReadToEndAsync().ContinueWith(
x =>
{
result.ReceivedOutput = x.Result;
});
// Read standard error using another thread
var errorOutputTask = restrictedProcess.StandardError.ReadToEndAsync().ContinueWith(
x =>
{
result.ErrorOutput = x.Result;
});
// Read memory consumption every few milliseconds to determine the peak memory usage of the process
const int TimeIntervalBetweenTwoMemoryConsumptionRequests = 45;
var memoryTaskCancellationToken = new CancellationTokenSource();
var memoryTask = Task.Run(
() =>
{
while (true)
{
// ReSharper disable once AccessToDisposedClosure
var peakWorkingSetSize = restrictedProcess.PeakWorkingSetSize;
result.MemoryUsed = Math.Max(result.MemoryUsed, peakWorkingSetSize);
if (memoryTaskCancellationToken.IsCancellationRequested)
{
return;
}
Thread.Sleep(TimeIntervalBetweenTwoMemoryConsumptionRequests);
}
},
memoryTaskCancellationToken.Token);
// Start the process
restrictedProcess.Start(timeLimit, memoryLimit);
// Wait the process to complete. Kill it after (timeLimit * 1.5) milliseconds if not completed.
// We are waiting the process for more than defined time and after this we compare the process time with the real time limit.
var exited = restrictedProcess.WaitForExit((int)(timeLimit * 1.5));
if (!exited)
{
restrictedProcess.Kill();
result.Type = ProcessExecutionResultType.TimeLimit;
}
// Close the memory consumption check thread
memoryTaskCancellationToken.Cancel();
try
{
// To be sure that memory consumption will be evaluated correctly
memoryTask.Wait(TimeIntervalBetweenTwoMemoryConsumptionRequests);
}
catch (AggregateException ex)
{
logger.Warn("AggregateException caught.", ex.InnerException);
}
// Close the task that gets the process error output
try
{
errorOutputTask.Wait(100);
}
catch (AggregateException ex)
{
logger.Warn("AggregateException caught.", ex.InnerException);
}
// Close the task that gets the process output
try
{
processOutputTask.Wait(100);
}
catch (AggregateException ex)
{
logger.Warn("AggregateException caught.", ex.InnerException);
}
Debug.Assert(restrictedProcess.HasExited, "Restricted process didn't exit!");
// Report exit code and total process working time
result.ExitCode = restrictedProcess.ExitCode;
result.TimeWorked = restrictedProcess.ExitTime - restrictedProcess.StartTime;
result.PrivilegedProcessorTime = restrictedProcess.PrivilegedProcessorTime;
result.UserProcessorTime = restrictedProcess.UserProcessorTime;
}
if (result.TotalProcessorTime.TotalMilliseconds > timeLimit)
{
result.Type = ProcessExecutionResultType.TimeLimit;
}
if (!string.IsNullOrEmpty(result.ErrorOutput))
{
result.Type = ProcessExecutionResultType.RunTimeError;
}
if (result.MemoryUsed > memoryLimit)
{
result.Type = ProcessExecutionResultType.MemoryLimit;
}
return result;
}