how to use actors in akka client side websockets - scala

Question

i am using akka client websockets https://doc.akka.io/docs/akka-http/current/client-side/websocket-support.html
i have a server which takes requests and respond in json
this is the pattern of my request and response
request #1
{
"janus" : "create",
"transaction" : "<random alphanumeric string>"
}
response #1
{
"janus": "success",
"session_id": 2630959283560140,
"transaction": "asqeasd4as3d4asdasddas",
"data": {
"id": 4574061985075210
}
}
then based on response #1 i need to initiate request #2 and upon receiving response #2 i need to initiate request #3 and so on
for example
then based on id 4574061985075210 i will send request #2 and receive it response
request # 2 {
}
response # 2 {
}
----
how can i use the actors with source and sink and re use the flow
here is my initial code
import akka.http.scaladsl.model.ws._
import scala.concurrent.Future
object WebSocketClientFlow {
def main(args: Array[String]) = {
implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
import system.dispatcher
val incoming: Sink[Message, Future[Done]] =
Sink.foreach[Message] {
case message: TextMessage.Strict =>
println(message.text)
//suppose here based on the server response i need to send another message to the server and so on do i need to repeat this same code here again ?????
}
val outgoing = Source.single(TextMessage("hello world!"))
val webSocketFlow = Http().webSocketClientFlow(WebSocketRequest("ws://echo.websocket.org"))
val (upgradeResponse, closed) =
outgoing
.viaMat(webSocketFlow)(Keep.right) // keep the materialized Future[WebSocketUpgradeResponse]
.toMat(incoming)(Keep.both) // also keep the Future[Done]
.run()
val connected = upgradeResponse.flatMap { upgrade =>
if (upgrade.response.status == StatusCodes.SwitchingProtocols) {
Future.successful(Done)
} else {
throw new RuntimeException(s"Connection failed: ${upgrade.response.status}")
}
}
connected.onComplete(println)
closed.foreach(_ => println("closed"))
}
}
and here i used Source.ActorRef
val url = "ws://0.0.0.0:8188"
val req = WebSocketRequest(url, Nil, Option("janus-protocol"))
implicit val system = ActorSystem()
implicit val materializer = ActorMaterializer()
import system.dispatcher
val webSocketFlow = Http().webSocketClientFlow(req)
val messageSource: Source[Message, ActorRef] =
Source.actorRef[TextMessage.Strict](bufferSize = 10, OverflowStrategy.fail)
val messageSink: Sink[Message, NotUsed] =
Flow[Message]
.map(message => println(s"Received text message: [$message]"))
.to(Sink.ignore)
val ((ws, upgradeResponse), closed) =
messageSource
.viaMat(webSocketFlow)(Keep.both)
.toMat(messageSink)(Keep.both)
.run()
val connected = upgradeResponse.flatMap { upgrade =>
if (upgrade.response.status == StatusCodes.SwitchingProtocols) {
Future.successful(Done)
} else {
throw new RuntimeException(s"Connection failed: ${upgrade.response.status}")
}
}
val source =
"""{ "janus": "create", "transaction":"d1403sa54a5s3d4as3das"}"""
val jsonAst = source.parseJson
ws ! TextMessage.Strict(jsonAst.toString())
now i need help in
how can i initiate the second request here because i need the "id" returned from the server to initiate request #2