aspnetcore/test/Microsoft.AspNetCore.WebSockets.Server.ConformanceTest/Autobahn/Executable.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Microsoft.AspNetCore.WebSockets.Server.Test.Autobahn
{
    public class Executable
    {
        private static readonly string _exeSuffix = RuntimeInformation.IsOSPlatform(OSPlatform.Windows) ? ".exe" : string.Empty;

        private readonly string _path;

        protected Executable(string path)
        {
            _path = path;
        }

        public static string Locate(string name)
        {
            foreach (var dir in Environment.GetEnvironmentVariable("PATH").Split(Path.PathSeparator))
            {
                var candidate = Path.Combine(dir, name + _exeSuffix);
                if (File.Exists(candidate))
                {
                    return candidate;
                }
            }
            return null;
        }

        public Task<int> ExecAsync(string args)
        {
            var process = new Process()
            {
                StartInfo = new ProcessStartInfo()
                {
                    FileName = _path,
                    Arguments = args,
                    UseShellExecute = false,
                },
                EnableRaisingEvents = true
            };
            var tcs = new TaskCompletionSource<int>();

            process.Exited += (_, __) => tcs.TrySetResult(process.ExitCode);

            process.Start();

            return tcs.Task;
        }
    }
}