HelloWorldAkkaServer.scala

package sttp.tapir.examples

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.Route

import scala.concurrent.{Await, Future}
import scala.concurrent.duration._

import scala.io.StdIn

object HelloWorldAkkaServer extends App {
  implicit val actorSystem: ActorSystem = ActorSystem()
  import actorSystem.dispatcher

  // tapir route
  val helloWorldRoute: Route = {
    import sttp.tapir._
    import sttp.tapir.server.akkahttp.AkkaHttpServerInterpreter

    val helloWorld: PublicEndpoint[String, Unit, String, Any] =
      endpoint.get.in("hello").in(query[String]("name")).out(stringBody)

    AkkaHttpServerInterpreter().toRoute(helloWorld.serverLogicSuccess(name => Future.successful(s"Hello, $name!")))
  }

  // direct akka http route
  val helloWorldRoute2: Route = {
    import akka.http.scaladsl.server.Directives._

    get {
      path("hello2") {
        parameter("name".as[String]) { name =>
          complete(s"Hello, $name!")
        }
      }
    }
  }

  // combining the two routes
  val combinedRoutes = {
    import akka.http.scaladsl.server.Directives._
    helloWorldRoute ~ helloWorldRoute2
  }

  // running the server
  val bind = Http().newServerAt("localhost", 8080).bindFlow(combinedRoutes)

  StdIn.readLine()
  Await.result(bind.transformWith { r => actorSystem.terminate().transform(_ => r) }, 1.minute)
}