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//
// ProcessUtils.cs
//
// Author:
// Michael Hutchinson <mhutch@xamarin.com>
// Jérémie Laval <jeremie.laval@xamarin.com>
//
// Copyright (c) 2012 Xamarin, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using System.IO;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;
namespace UserInterfaceTests
{
public static class ProcessUtils
{
public static Task<int> StartProcess (ProcessStartInfo psi, TextWriter stdout, TextWriter stderr, CancellationToken cancellationToken)
{
var tcs = new TaskCompletionSource<int> ();
if (cancellationToken.CanBeCanceled && cancellationToken.IsCancellationRequested) {
tcs.TrySetCanceled ();
return tcs.Task;
}
psi.UseShellExecute = false;
psi.RedirectStandardOutput |= stdout != null;
psi.RedirectStandardError |= stderr != null;
var p = Process.Start (psi);
if (cancellationToken.CanBeCanceled) {
cancellationToken.Register (() => {
try {
if (!p.HasExited) {
p.Kill ();
}
} catch (InvalidOperationException ex) {
if (ex.Message.IndexOf ("already exited", StringComparison.Ordinal) < 0)
throw;
}
});
}
bool outputDone = false;
bool errorDone = false;
bool exitDone = false;
p.EnableRaisingEvents = true;
if (psi.RedirectStandardOutput) {
bool stdOutInitialized = false;
p.OutputDataReceived += (sender, e) => {
try {
if (e.Data == null) {
outputDone = true;
if (exitDone && errorDone)
tcs.TrySetResult (p.ExitCode);
return;
}
if (stdOutInitialized)
stdout.WriteLine ();
stdout.Write (e.Data);
stdOutInitialized = true;
} catch (Exception ex) {
tcs.TrySetException (ex);
}
};
p.BeginOutputReadLine ();
} else {
outputDone = true;
}
if (psi.RedirectStandardError) {
bool stdErrInitialized = false;
p.ErrorDataReceived += (sender, e) => {
try {
if (e.Data == null) {
errorDone = true;
if (exitDone && outputDone)
tcs.TrySetResult (p.ExitCode);
return;
}
if (stdErrInitialized)
stderr.WriteLine ();
stderr.Write (e.Data);
stdErrInitialized = true;
} catch (Exception ex) {
tcs.TrySetException (ex);
}
};
p.BeginErrorReadLine ();
} else {
errorDone = true;
}
p.Exited += (sender, e) => {
exitDone = true;
if (errorDone && outputDone)
tcs.TrySetResult (p.ExitCode);
};
return tcs.Task;
}
}
}
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