Akka HTTP: Blocking in a future blocks the server

Question

I am trying to use Akka HTTP to basic authenticate my request. It so happens that I have an external resource to authenticate through, so I have to make a rest call to this

Answer 1

Strange, but for me everything works fine (no blocking). Here is code:

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.server.Directives._
import akka.http.scaladsl.server.Route
import akka.stream.ActorMaterializer

import scala.concurrent.Future


object Main {

  implicit val system = ActorSystem()
  implicit val executor = system.dispatcher
  implicit val materializer = ActorMaterializer()

  val routes: Route = (post & entity(as[String])) { e =>
    complete {
      Future {
        Thread.sleep(5000)
        e
      }
    }
  } ~
    (get & path(Segment)) { r =>
      complete {
        "get"
      }
    }

  def main(args: Array[String]) {

    Http().bindAndHandle(routes, "0.0.0.0", 9000).onFailure {
      case e =>
        system.shutdown()
    }
  }
}

Also you can wrap you async code into onComplete or onSuccess directive:

onComplete(Future{Thread.sleep(5000)}){e} 

onSuccess(Future{Thread.sleep(5000)}){complete(e)}