[writing-async-app-in-scala-part-2] safeFuture implementation

safeFuture.scala

def safeFuture[T](f: => Future[T]): Future[T] = {
  try {
    f
  } catch {
    case NonFatal(e) => Future.failed(e)
  }
}

def handleFromMemcached(r: HttpRequest): Future[Option[Int]] = safeFuture {
  require(r.uri != "/memcached-boom", "Memcached Boom!")
  Future.successful(if (r.uri == "/memcached") Some(42) else None)
}