Introduce PULUMI_DEBUG_GRPC support

pulumi-language-dotnet/main.go

@@ -106,22 +106,24 @@ func main() {
 	}
 
 	// Fire up a gRPC server, letting the kernel choose a free port.
-	port, done, err := rpcutil.Serve(0, cancelChannel, []func(*grpc.Server) error{
-		func(srv *grpc.Server) error {
+	handle, err := rpcutil.ServeWithOptions(rpcutil.ServeOptions{
+		Cancel: cancelChannel,
+		Init: func(srv *grpc.Server) error {
 			host := newLanguageHost(dotnetExec, engineAddress, tracing, binary)
 			pulumirpc.RegisterLanguageRuntimeServer(srv, host)
 			return nil
 		},
-	}, nil)
+		Options: rpcutil.OpenTracingServerInterceptorOptions(nil),
+	})
 	if err != nil {
 		cmdutil.Exit(errors.Wrapf(err, "could not start language host RPC server"))
 	}
 
 	// Otherwise, print out the port so that the spawner knows how to reach us.
-	fmt.Printf("%d\n", port)
+	fmt.Printf("%d\n", handle.Port)
 
 	// And finally wait for the server to stop serving.
-	if err := <-done; err != nil {
+	if err := <-handle.Done; err != nil {
 		cmdutil.Exit(errors.Wrapf(err, "language host RPC stopped serving"))
 	}
 }