akka http showcase

AkkaHttpApp.scala

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.{Directives, Route}
import akka.stream.ActorMaterializer

import scala.concurrent.ExecutionContext

abstract class AkkaHttpApp(host: String = "localhost", port: Int = 8080) extends App with Directives {
  implicit val sys: ActorSystem = ActorSystem()
  implicit val mat: ActorMaterializer = ActorMaterializer()
  implicit val ec: ExecutionContext = sys.dispatcher

  def routes: Route

  Http().bindAndHandle(routes, host, port).onComplete(println)
}


import akka.http.scaladsl.server.Route

object SimpleServer extends AkkaHttpApp {
  def helloWorld = path("hello") {
    complete("world!")
  }

  def getOrPost = get | post

  def calc(p: String)(f: (Int, Int) => Int) =
    (path(p) & getOrPost & parameter('x.as[Int], 'y.as[Int])) { (x, y) =>
      complete(s"The result is ${f(x, y)}")
    }

  def multiply = calc("multiply")(_ * _)
  def sum = calc("sum")(_ + _)
  def sub = calc("sub")(_ - _)

  def routes: Route = pathPrefix("v1") {
    helloWorld ~ sum ~ sub ~ multiply
  }
}