How to create WSClient in Scala ?

Question

Hello I'm writing scala code to pull the data from API. Data is paginated, so I'm pulling a data sequentially. Now, I'm looking a solution to pulling multiple page parallel and stuck to create WSClient programatically instead of Inject.

Anyone have a solution to create WSClient ?

I found a AhcWSClient(), but it required to implicitly import actor system.

If you do not already have an actor system running, you must create one. You can find an example in the README of WSClient's github repo: https://github.com/playframework/play-ws#scala-1 — Aki, Dec 06 '18 at 23:14
You're using WSClient standalone (without a playframework application), aren't you? — Aki, Dec 06 '18 at 23:15
From your question it is not clear why you need to create an explicitly new instance of a `WSClient`. How is this related to pagination? I believe `WSClient` supports sending several requests in parallel using one instance of `WSClient`. — SergGr, Dec 06 '18 at 23:40

score 3 · Answer 1 · answered Sep 12 '19 at 15:24

3

When you cannot Inject one as suggested in the other answer, you can create a Standalone WS client using:

import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import play.api.libs.ws._
import play.api.libs.ws.ahc.StandaloneAhcWSClient

implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
val ws = StandaloneAhcWSClient()

answered Sep 12 '19 at 15:24

Jethro

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thanks. I am using compile time injection and so I suppose I can't use @Inject. Is there a way to instantiate `WS`. Is there a way to instantiate `ws` ? – Manu Chadha Dec 21 '20 at 13:01
I think I found out that I can also use AhcWSClient. What is the difference between `AhsWSClient` and `StandaloneAhcWSClient` one? - https://www.playframework.com/documentation/2.6.x/api/scala/play/api/libs/ws/ahc/AhcWSClient.html – Manu Chadha Dec 21 '20 at 13:06

Lasf · Answer 2 · 2018-12-07T18:12:48.810

No need to reinvent the wheel here. And I'm not sure why you say you can't inject a WSClient. If you can inject a WSClient, then you could do something like this to run the requests in parallel:

class MyClient @Inject() (wsClient: WSClient)(implicit ec: ExecutionContext) {

  def getSomething(urls: Vector[String]): Future[Something] = {
    val futures = urls.par.map { url =>
      wsClient.url(url).get()
    }
    Future.sequence(futures).map { responses =>
      //process responses here. You might want to fold them together
    }
  }

}

How to create WSClient in Scala ?

2 Answers2