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Fully asynchronous http client call with json streamed response using akka-http will work in all cases, even with chunked responses ! / published by https://github.com/dacr/code-examples-manager #25d85f17-5e12-4a74-ba8a-6aa629575af5/acc9d334dad26f7a16fa2fd943067ed7b3ac9403
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// summary : Fully asynchronous http client call with json streamed response using akka-http will work in all cases, even with chunked responses ! | |
// keywords : scala, actors, akka, http-client, client, json, json4s, http-stream, stream | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : 25d85f17-5e12-4a74-ba8a-6aa629575af5 | |
// created-on : 2018-06-19T19:10:04Z | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "2.13.8" | |
//> using dep "com.typesafe.akka::akka-http:10.2.7" | |
//> using dep "com.typesafe.akka::akka-stream:2.6.18" | |
//> using dep "de.heikoseeberger::akka-http-json4s:1.38.2" | |
//> using dep "org.json4s::json4s-jackson:4.0.3" | |
//// using lib "org.slf4j:slf4j-nop:1.7.32" | |
// --------------------- | |
/* | |
akka-http http client request with streamed json responses | |
--- | |
scala in script mode using ammonite REPL (http://ammonite.io/) | |
--- | |
take care this example is using the `toStrict(timeout)` method | |
to eagerly consume the entity and make it available in memory | |
*/ | |
import akka.http.scaladsl._ | |
import akka.http.scaladsl.model._ | |
import akka.stream.scaladsl.Framing | |
import akka.util.ByteString | |
import scala.concurrent._ | |
import scala.concurrent.duration._ | |
import org.json4s.{DefaultFormats, JValue} | |
import org.json4s.jackson.JsonMethods._ | |
import org.json4s._ | |
object TestThat { | |
implicit val system = akka.actor.ActorSystem("MySystem") | |
implicit val executionContext = system.dispatcher | |
implicit val serialization = jackson.Serialization | |
implicit val formats = DefaultFormats | |
// curl -s -H "accept: application/json" http://httpbin.org/stream/99 | jq | |
val uri = s"http://httpbin.org/stream/99" | |
val futureResponse = Http().singleRequest(HttpRequest(uri = uri)) | |
val strictEntity:Future[HttpEntity.Strict] = futureResponse.flatMap{_.entity.toStrict(3.seconds)} | |
val futureResult: Future[List[JValue]] = futureResponse.flatMap { response => | |
response.entity.dataBytes | |
.via(Framing.delimiter(ByteString("\n"), maximumFrameLength = 256)) | |
.map(buf => parse(buf.decodeString("UTF-8"))) | |
.runFold(List.empty[JValue]) {case (acc,jv) => jv::acc} | |
} | |
val out = for { | |
results <- futureResult | |
} yield { | |
results.foreach{result => println(pretty(render(result))) } | |
} | |
// Do not exit before the future has completed ;) | |
def andWait():Unit = Await.ready(out, 10.seconds) | |
} | |
TestThat.andWait() |
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