Akka HTTP extremely simple example

akka-http-simple

import akka.actor.ActorSystem
import akka.http.Http
import akka.http.marshallers.sprayjson.SprayJsonSupport._
import akka.http.model.StatusCodes._
import akka.http.server.Directives._
import akka.http.server.PathMatchers.IntNumber
import akka.stream.{ActorFlowMaterializer, FlowMaterializer}
import spray.json.{DefaultJsonProtocol, _}

import scala.concurrent.ExecutionContextExecutor

case class Whatever(id: Int, name: String)

trait WhateverService extends DefaultJsonProtocol {

  implicit val whateverFormat = jsonFormat2(Whatever.apply)
  implicit val system: ActorSystem
  implicit def executor: ExecutionContextExecutor
  implicit val materializer: FlowMaterializer

  val routes = {
    (get & path("whatever")) { complete(OK -> "Lots of whatever") } ~
      (get & path("whatever" / IntNumber)) { int => complete(OK -> Whatever(int, "whatever").toJson.prettyPrint) } ~
      (get & path("whatever" / IntNumber / "wat")) { w => complete(OK -> s"Wat for whatever $w") } ~
      (post & path("whatever") & entity(as[Whatever])) { w => complete(OK -> s"$w created succesfully") } ~
      (put & path("whatever" / IntNumber) & entity(as[Whatever])) { (id, w) => complete(OK -> s"Whatever $id updated with $w") }
  }

}

object WhateverHttp extends App with WhateverService {

  override implicit val system = ActorSystem()
  override implicit val executor = system.dispatcher
  override implicit val materializer = ActorFlowMaterializer()

  val interface = "0.0.0.0"
  val port = 9000

  Http().bindAndHandle(routes, interface, port)

}