CODEWITHSUNDEEP
scalaakkaakka-http
serg
serg

Reputation: 111285

How to create akka-http cachedHostConnectionPool for https requests in scala?

I can't figure out how to create cachedHostConnectionPool in akka-http using scala for sending https requests. queueRequest(HttpRequest(uri = "https://example.com") sends a request to http, cachedHostConnectionPool[Promise[HttpResponse]]("https://example.com") throws an error that : isn't expected character. 

import scala.util.{ Failure, Success }
import scala.concurrent.{ Future, Promise }

import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.stream.ActorMaterializer
import akka.stream.scaladsl._

import akka.stream.{ OverflowStrategy, QueueOfferResult }

implicit val system = ActorSystem()
import system.dispatcher // to get an implicit ExecutionContext into scope
implicit val materializer = ActorMaterializer()

val QueueSize = 10

// This idea came initially from this blog post:
// http://kazuhiro.github.io/scala/akka/akka-http/akka-streams/2016/01/31/connection-pooling-with-akka-http-and-source-queue.html
val poolClientFlow = Http().cachedHostConnectionPool[Promise[HttpResponse]]("example.com")
val queue =
  Source.queue[(HttpRequest, Promise[HttpResponse])](QueueSize, OverflowStrategy.dropNew)
    .via(poolClientFlow)
    .toMat(Sink.foreach({
      case ((Success(resp), p)) => p.success(resp)
      case ((Failure(e), p))    => p.failure(e)
    }))(Keep.left)
    .run()

def queueRequest(request: HttpRequest): Future[HttpResponse] = {
  val responsePromise = Promise[HttpResponse]()
  queue.offer(request -> responsePromise).flatMap {
    case QueueOfferResult.Enqueued    => responsePromise.future
    case QueueOfferResult.Dropped     => Future.failed(new RuntimeException("Queue overflowed. Try again later."))
    case QueueOfferResult.Failure(ex) => Future.failed(ex)
    case QueueOfferResult.QueueClosed => Future.failed(new RuntimeException("Queue was closed (pool shut down) while running the request. Try again later."))
  }
}

val responseFuture: Future[HttpResponse] = queueRequest(HttpRequest(uri = "/"))

It seems like scala version supports only plain host names while in java you can provide a protocol too (from their tests):

http.cachedHostConnectionPool("akka.io", materializer());
http.cachedHostConnectionPool("https://akka.io", materializer());
http.cachedHostConnectionPool("https://akka.io:8080", materializer());

Any known workarounds?

Upvotes: 2

Views: 1455

Answers (1)

michaJlS
michaJlS

Reputation: 2500

You have to use cachedHostConnectionPoolHttps instead:

val poolClientFlow = Http().cachedHostConnectionPoolHttps[Promise[HttpResponse]]("example.com")

Upvotes: 6

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