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Fix for #747 'git fetch' sporadically hangs, GitServiceExecutor now asynchronous. #840

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Fix for #747 'git fetch' sporadically hangs, GitServiceExecutor now asynchronous. #840

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ec10d08
Fixed git deadlock bug in GitServiceExecutor. Fault due to stdIn and …
Jul 4, 2019
dbabdd4
removed trailing white-space.
Jul 4, 2019
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44 changes: 36 additions & 8 deletions Bonobo.Git.Server/Git/GitService/GitServiceExecutor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

namespace Bonobo.Git.Server.Git.GitService
{
Expand Down Expand Up @@ -93,15 +95,41 @@ public void ExecuteServiceByName(

using (var process = Process.Start(info))
{
inStream.CopyTo(process.StandardInput.BaseStream);
if (options.endStreamWithClose) {
process.StandardInput.Close();
} else {
process.StandardInput.Write('\0');
}
//Do asynchronous copy i.e. spin up a separate task so we can simultaneously read/write &
//avoid deadlock due to filled buffers within git process
Task stdInTask = inStream.CopyToAsync(process.StandardInput.BaseStream);

//Don't bother waiting on completion of stdOutTask while process is running.
//task will be sitting idle waiting for new bytes on stdOut of git
Task stdOutTask = process.StandardOutput.BaseStream.CopyToAsync(outStream);

//wait for process death and ensure all data is sent and received
bool completionJobDone = false;
while (true)
{
//check if all output has been sent to git exe via stdin
if ((stdInTask.IsCompleted) && (completionJobDone==false))
{
//all output has been sent to git process, send final signal.
if (options.endStreamWithClose)
{
process.StandardInput.Close();
}
else
{
process.StandardInput.Write('\0');
}
completionJobDone = true;
}

process.StandardOutput.BaseStream.CopyTo(outStream);
process.WaitForExit();
//check if git has terminated
if (process.HasExited)
break;

//lets not hog all the CPU, sleep for a little while (20ms)
Thread.Sleep(20);
}
stdOutTask.Wait();
}
}

Expand Down