directive1.scala

val logDuration: Directive0 = extractRequestContext.flatMap { ctx =>
  val start = System.currentTimeMillis()
  mapResponse { resp =>
    val took = System.currentTimeMillis() - start
    logger.info(s"[${resp.status.intValue()}] ${ctx.request.method.name} " +
      s"${ctx.request.uri} took: ${d}ms")
    resp
  } 
}