Logging request duration, path, status code using Akka HTTP

request-logging.scala

// Setup 
val rejectionHandler = RejectionHandler.default
val logDuration = extractRequestContext.flatMap { ctx =>
  val start = System.currentTimeMillis()
  // handling rejections here so that we get proper status codes
  mapResponse { resp =>
    val d = System.currentTimeMillis() - start
    logger.info(s"[${resp.status.intValue()}] ${ctx.request.method.name} ${ctx.request.uri} took: ${d}ms")
    resp
  } & handleRejections(rejectionHandler)
}

// Usage
// Example Route
def healthRoute =
    pathPrefix("health") {
      get {
        ...
        }
      }
    }

// This will log the following routes
val routes = logDuration(healthRoute ~ otherRoute ~ anotherRoute)