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// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
namespace WixToolset.Tools
{
using System;
using System.Diagnostics;
using System.IO.Pipes;
using System.Text;
using System.Threading;
/// <summary>
/// Runs a bundle with provided command-line.
/// </summary>
public class BundleRunner
{
/// <summary>
/// Creates a runner for the provided bundle.
/// </summary>
/// <param name="bundle">Path to the bundle to run.</param>
public BundleRunner(string bundle)
{
this.Path = bundle;
}
/// <summary>
/// Fired when the bundle encounters an error.
/// </summary>
public event EventHandler<BundleErrorEventArgs> Error;
/// <summary>
/// Fired when the bundle progress is udpated.
/// </summary>
public event EventHandler<BundleProgressEventArgs> Progress;
/// <summary>
/// Gets the path to the bundle to run.
/// </summary>
public string Path { get; private set; }
/// <summary>
/// Runs the bundle with the provided command-line.
/// </summary>
/// <param name="commandLine">Optional command-line to pass to the bundle.</param>
/// <returns>Exit code from the bundle.</returns>
public int Run(string commandLine = null)
{
WaitHandle[] waits = new WaitHandle[] { new ManualResetEvent(false), new ManualResetEvent(false) };
int returnCode = 0;
int pid = Process.GetCurrentProcess().Id;
string pipeName = String.Concat("bpe_", pid);
string pipeSecret = Guid.NewGuid().ToString("N");
using (NamedPipeServerStream pipe = new NamedPipeServerStream(pipeName, PipeDirection.InOut, 1))
{
using (Process bundleProcess = new Process())
{
bundleProcess.StartInfo.FileName = this.Path;
bundleProcess.StartInfo.Arguments = String.Format("{0} -burn.embedded {1} {2} {3}", commandLine ?? String.Empty, pipeName, pipeSecret, pid);
bundleProcess.StartInfo.UseShellExecute = false;
bundleProcess.StartInfo.CreateNoWindow = true;
bundleProcess.Start();
Connect(pipe, pipeSecret, pid, bundleProcess.Id);
PumpMessages(pipe);
bundleProcess.WaitForExit();
returnCode = bundleProcess.ExitCode;
}
}
return returnCode;
}
/// <summary>
/// Called when bundle encounters an error.
/// </summary>
/// <param name="e">Additional arguments for this event.</param>
protected virtual void OnError(BundleErrorEventArgs e)
{
EventHandler<BundleErrorEventArgs> handler = this.Error;
if (handler != null)
{
handler(this, e);
}
}
/// <summary>
/// Called when bundle progress is updated.
/// </summary>
/// <param name="e">Additional arguments for this event.</param>
protected virtual void OnProgress(BundleProgressEventArgs e)
{
EventHandler<BundleProgressEventArgs> handler = this.Progress;
if (handler != null)
{
handler(this, e);
}
}
private void Connect(NamedPipeServerStream pipe, string pipeSecret, int pid, int childPid)
{
pipe.WaitForConnection();
WriteSecretToPipe(pipe, pipeSecret);
WriteNumberToPipe(pipe, (uint)pid);
uint ack = ReadNumberFromPipe(pipe);
// This is not true when bundle is run under a debugger
//if (ack != childPid)
//{
// throw new ApplicationException("Incorrect child process.");
//}
}
private void PumpMessages(NamedPipeServerStream pipe)
{
uint messageId;
while (TryReadNumberFromPipe(pipe, out messageId))
{
uint messageSize = ReadNumberFromPipe(pipe);
BundleResult result = BundleResult.None;
switch (messageId)
{
case 1: //error
result = ProcessErrorMessage(pipe);
break;
case 2: // progress
result = ProcessProgressMessage(pipe);
break;
default: // unknown message, do nothing.
break;
}
CompleteMessage(pipe, result);
}
}
private BundleResult ProcessErrorMessage(NamedPipeServerStream pipe)
{
BundleErrorEventArgs e = new BundleErrorEventArgs();
e.Code = (int)ReadNumberFromPipe(pipe);
e.Message = ReadStringFromPipe(pipe);
e.UIHint = (int)ReadNumberFromPipe(pipe);
this.OnError(e);
return e.Result;
}
private BundleResult ProcessProgressMessage(NamedPipeServerStream pipe)
{
ReadNumberFromPipe(pipe); // eat the first progress number because it is always zero.
BundleProgressEventArgs e = new BundleProgressEventArgs();
e.Progress = (int)ReadNumberFromPipe(pipe);
this.OnProgress(e);
return e.Result;
}
private void CompleteMessage(NamedPipeServerStream pipe, BundleResult result)
{
uint complete = 0xF0000002;
WriteNumberToPipe(pipe, complete);
WriteNumberToPipe(pipe, 4); // size of message data
WriteNumberToPipe(pipe, (uint)result);
}
private uint ReadNumberFromPipe(NamedPipeServerStream pipe)
{
byte[] buffer = new byte[4];
pipe.Read(buffer, 0, buffer.Length);
return BitConverter.ToUInt32(buffer, 0);
}
private string ReadStringFromPipe(NamedPipeServerStream pipe)
{
uint length = ReadNumberFromPipe(pipe);
byte[] buffer = new byte[length * 2];
pipe.Read(buffer, 0, buffer.Length);
return Encoding.Unicode.GetString(buffer);
}
private bool TryReadNumberFromPipe(NamedPipeServerStream pipe, out uint value)
{
value = ReadNumberFromPipe(pipe); // reading will not block and return zero if pipe is not connected.
return pipe.IsConnected;
}
private void WriteNumberToPipe(NamedPipeServerStream pipe, uint value)
{
byte[] buffer = BitConverter.GetBytes(value);
pipe.Write(buffer, 0, buffer.Length);
}
private void WriteSecretToPipe(NamedPipeServerStream pipe, string secret)
{
byte[] buffer = Encoding.Unicode.GetBytes(secret);
WriteNumberToPipe(pipe, (uint)buffer.Length);
pipe.Write(buffer, 0, buffer.Length);
}
}
}
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