Should I be accessing this.(submission|solution)Child.stdin directly?

[joshuakfarrar]

Is this appropriate? I see that if you want to hook into Stdout of a child, you can access exercise.(submission|solution)Stdout, and that the exercise class has a method for getStdout.. Is there a better way to handle the IOs of child processes?

function query (mode) {
  var exercise = this

  function send (stream) {
    var input = through2()
    input
      .pipe(stream)
      .on('error', function(err) {
        exercise.emit(
          'fail',
          'Submission never read from process.stdin'
        )
      })
    input.write('secret message');
    input.end();
  }

  send(exercise.submissionChild.stdin)

  if (mode == 'verify')
    send(exercise.solutionChild.stdin)
}