I am working my way through the websocket example and have a question about
nested streams. Currently I have this:
import akka.actor.ActorRef
import akka.http.scaladsl.model.ws.{BinaryMessage, TextMessage, Message}
import akka.stream.{OverflowStrategy, FlowShape}
import akka.stream.scaladsl.{Sink, Source, FlowGraph, Flow}
object ChatFlow {
def apply(userId: Long, channel: Long, rabbitActor: ActorRef): Flow[Message,
Message, ActorRef] =
Flow.fromGraph(FlowGraph.create(Source.actorRef[RabbitActor.Message](5,
OverflowStrategy.fail)) { implicit b =>
rabbitSource =>
import FlowGraph.Implicits._
// for now, ignore all content coming from the websocket
val fromWebsocket = b.add(Sink.foreach[Message] {
case TextMessage.Strict(content) => println(content)
// case bm: BinaryMessage => bm.dataStream.runWith(Sink.ignore)
})
// translate rabbit messages into socket messages
val toWebSocket = b.add(Flow[RabbitActor.Message] map {
case _ => TextMessage(s"test")
})
// when this stream is materialized, register it with rabbitmq
val websocketMaterialized = b.materializedValue map { actor =>
RabbitActor.UserJoined(userId, channel, actor)
}
val rabbitMQSink = Sink.actorRef[RabbitActor.Message](rabbitActor,
RabbitActor.UserLeft(userId, channel))
websocketMaterialized ~> rabbitMQSink
rabbitSource ~> toWebSocket
FlowShape(fromWebsocket.inlet, toWebSocket.outlet)
})
}
My question is about the commented out BinaryMessage. bm.dataStream is a
Source, and the docs say I should drain this stream to clear the socket.
How would I do that in this scenario without passing in a materializer?
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