public async Task ServerRequest_WriteRead_RoundtripsProperly()
{
// Arrange
var request = new ServerRequest(
ServerProtocol.ProtocolVersion,
ImmutableArray.Create(
new RequestArgument(RequestArgument.ArgumentId.CurrentDirectory, argumentIndex: 0, value: "directory"),
new RequestArgument(RequestArgument.ArgumentId.CommandLineArgument, argumentIndex: 1, value: "file")));
var memoryStream = new MemoryStream();
// Act
await request.WriteAsync(memoryStream, CancellationToken.None);
// Assert
Assert.True(memoryStream.Position > 0);
memoryStream.Position = 0;
var read = await ServerRequest.ReadAsync(memoryStream, CancellationToken.None);
Assert.Equal(ServerProtocol.ProtocolVersion, read.ProtocolVersion);
Assert.Equal(2, read.Arguments.Count);
Assert.Equal(RequestArgument.ArgumentId.CurrentDirectory, read.Arguments[0].Id);
Assert.Equal(0, read.Arguments[0].ArgumentIndex);
Assert.Equal("directory", read.Arguments[0].Value);
Assert.Equal(RequestArgument.ArgumentId.CommandLineArgument, read.Arguments[1].Id);
Assert.Equal(1, read.Arguments[1].ArgumentIndex);
Assert.Equal("file", read.Arguments[1].Value);
}
public async Task ShutdownRequest_WriteRead_RoundtripsProperly()
{
// Arrange
var memoryStream = new MemoryStream();
var request = ServerRequest.CreateShutdown();
// Act
await request.WriteAsync(memoryStream, CancellationToken.None);
// Assert
memoryStream.Position = 0;
var read = await ServerRequest.ReadAsync(memoryStream, CancellationToken.None);
var argument1 = request.Arguments[0];
Assert.Equal(RequestArgument.ArgumentId.Shutdown, argument1.Id);
Assert.Equal(0, argument1.ArgumentIndex);
Assert.Equal("", argument1.Value);
var argument2 = request.Arguments[1];
Assert.Equal(RequestArgument.ArgumentId.CommandLineArgument, argument2.Id);
Assert.Equal(1, argument2.ArgumentIndex);
Assert.Equal("shutdown", argument2.Value);
}
internal async Task <ConnectionResult> AcceptConnection(Task <Connection> task, bool accept, CancellationToken cancellationToken)
{
Connection connection;
try
{
connection = await task;
}
catch (Exception ex)
{
// Unable to establish a connection with the client. The client is responsible for
// handling this case. Nothing else for us to do here.
ServerLogger.LogException(ex, "Error creating client named pipe");
return(new ConnectionResult(ConnectionResult.Reason.CompilationNotStarted));
}
try
{
using (connection)
{
ServerRequest request;
try
{
ServerLogger.Log("Begin reading request.");
request = await ServerRequest.ReadAsync(connection.Stream, cancellationToken).ConfigureAwait(false);
ServerLogger.Log("End reading request.");
}
catch (Exception e)
{
ServerLogger.LogException(e, "Error reading build request.");
return(new ConnectionResult(ConnectionResult.Reason.CompilationNotStarted));
}
if (request.IsShutdownRequest())
{
// Reply with the PID of this process so that the client can wait for it to exit.
var response = new ShutdownServerResponse(Process.GetCurrentProcess().Id);
await response.WriteAsync(connection.Stream, cancellationToken);
// We can safely disconnect the client, then when this connection gets cleaned up by the event loop
// the server will go to a shutdown state.
return(new ConnectionResult(ConnectionResult.Reason.ClientShutdownRequest));
}
else if (!accept)
{
// We're already in shutdown mode, respond gracefully so the client can run in-process.
var response = new RejectedServerResponse();
await response.WriteAsync(connection.Stream, cancellationToken).ConfigureAwait(false);
return(new ConnectionResult(ConnectionResult.Reason.CompilationNotStarted));
}
else
{
// If we get here then this is a real request that we will accept and process.
//
// Kick off both the compilation and a task to monitor the pipe for closing.
var buildCancelled = CancellationTokenSource.CreateLinkedTokenSource(cancellationToken);
var watcher = connection.WaitForDisconnectAsync(buildCancelled.Token);
var worker = ExecuteRequestAsync(request, buildCancelled.Token);
// await will end when either the work is complete or the connection is closed.
await Task.WhenAny(worker, watcher);
// Do an 'await' on the completed task, preference being compilation, to force
// any exceptions to be realized in this method for logging.
ConnectionResult.Reason reason;
if (worker.IsCompleted)
{
var response = await worker;
try
{
ServerLogger.Log("Begin writing response.");
await response.WriteAsync(connection.Stream, cancellationToken);
ServerLogger.Log("End writing response.");
reason = ConnectionResult.Reason.CompilationCompleted;
_eventBus.CompilationCompleted();
}
catch
{
reason = ConnectionResult.Reason.ClientDisconnect;
}
}
else
{
await watcher;
reason = ConnectionResult.Reason.ClientDisconnect;
}
// Begin the tear down of the Task which didn't complete.
buildCancelled.Cancel();
return(new ConnectionResult(reason, request.KeepAlive));
}
}
}
catch (Exception ex)
{
ServerLogger.LogException(ex, "Error handling connection");
return(new ConnectionResult(ConnectionResult.Reason.ClientException));
}
}
