private async Task<BuildResponse> DoCompilationAsync(NamedPipeClientStream pipeStream,
BuildRequest req,
CancellationToken cancellationToken)
{
using (pipeStream)
{
try
{
// Start a monitor that cancels if the pipe closes on us
var monitorCancellation = new CancellationTokenSource();
Task disconnectMonitor = MonitorPipeForDisconnectionAsync(pipeStream, monitorCancellation.Token);
// Write the request.
CompilerServerLogger.Log("Writing request");
await req.WriteAsync(pipeStream, cancellationToken).ConfigureAwait(false);
// Read the response.
CompilerServerLogger.Log("Reading response");
BuildResponse response = await BuildResponse.ReadAsync(pipeStream, cancellationToken).ConfigureAwait(false);
// Stop monitoring pipe
monitorCancellation.Cancel(throwOnFirstException: true);
await disconnectMonitor.ConfigureAwait(false);
Debug.Assert(response != null);
CompilerServerLogger.Log("BuildResponse received; exit code={0}", response.ReturnCode);
return response;
}
catch (PipeBrokenException e)
{
CompilerServerLogger.LogException(e, "Server process died; pipe broken.");
return null;
}
catch (ObjectDisposedException e)
{
CompilerServerLogger.LogException(e, "Pipe stream unexpectedly disposed");
return null;
}
}
}
/// <summary>
/// Try to compile using the server. Returns null if a response from the
/// server cannot be retrieved.
/// </summary>
private static async Task<BuildResponse> TryCompile(NamedPipeClientStream pipeStream,
BuildRequest request,
CancellationToken cancellationToken)
{
BuildResponse response;
using (pipeStream)
{
// Write the request
try
{
Log("Begin writing request");
await request.WriteAsync(pipeStream, cancellationToken).ConfigureAwait(false);
Log("End writing request");
}
catch (Exception e)
{
LogException(e, "Error writing build request.");
return null;
}
// Wait for the compilation and a monitor to detect if the server disconnects
var serverCts = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
Log("Begin reading response");
var responseTask = BuildResponse.ReadAsync(pipeStream, serverCts.Token);
var monitorTask = CreateMonitorDisconnectTask(pipeStream, serverCts.Token);
await Task.WhenAny(responseTask, monitorTask).ConfigureAwait(false);
Log("End reading response");
if (responseTask.IsCompleted)
{
// await the task to log any exceptions
try
{
response = await responseTask.ConfigureAwait(false);
}
catch (Exception e)
{
LogException(e, "Error reading response");
response = null;
}
}
else
{
Log("Server disconnect");
response = null;
}
// Cancel whatever task is still around
serverCts.Cancel();
return response;
}
}