Akka Http: Calling TypedActor.context outside of a TypedActor implementation method - scala

Question

I'm trying to build akka http client, by using this example Test akka http client
This is my code:
trait HttpServer {
def sendAndReceive: HttpRequest => Future[HttpResponse]
}
trait ApiHandler extends HttpServer {
implicit def as: ActorSystem
override def sendAndReceive: HttpRequest => Future[HttpResponse] =
Http().singleRequest(_)
}
trait Api {
this: ApiHandler =>
implicit def as: ActorSystem
implicit def mat: Materializer
implicit def ec: ExecutionContext
def request(httpRequest: HttpRequest): Future[HttpResponse] = {
sendAndReceive(httpRequest).flatMap { response =>
response.status match {
case StatusCodes.OK => Future.successful(response)
case _ => throw new RuntimeException ("error")
}
}
}
}
class ApiImpl() (implicit val as: ActorSystem, val mat: Materializer, val ec: ExecutionContext) extends Api with ApiHandler {
def request: Future[HttpResponse] = {
val httpRequest = ???
request(httpRequest)
}
}
And this is how I call request method:
implicit val actorSystem = ActorSystem("system")
implicit val executionContext = actorSystem.dispatcher
implicit val materializer = ActorMaterializer()
val api = new ApiImpl()
api.request
I receive the following error in place, where trait Api request calls sendAndReceive-method (in this line: sendAndReceive(httpRequest).flatMap { response => ):
Calling TypedActor.context outside of a TypedActor implementation method!
What am I doing wrong?

Answer 1

This code:
trait HttpServer {
def sendAndReceive: HttpRequest => Future[HttpResponse]
}
trait ApiHandler extends HttpServer {
implicit def as: ActorSystem
override def sendAndReceive: HttpRequest => Future[HttpResponse] =
Http().singleRequest(_)
}
trait Api {
this: ApiHandler =>
implicit def as: ActorSystem
implicit def mat: Materializer
implicit def ec: ExecutionContext
def request(httpRequest: HttpRequest) = {
sendAndReceive(httpRequest).flatMap {
response =>
response.status match {
case StatusCodes.OK => Future.successful(response)
case _ => throw new RuntimeException("error")
}
}
}
}
class ApiImpl()(implicit val as: ActorSystem, val mat: Materializer, val ec: ExecutionContext) extends Api with ApiHandler {
def request2 = {
val httpRequest = Get("https://akka.io")
request(httpRequest)
}
}
def main(args: Array[String]): Unit = {
implicit val actorSystem = ActorSystem("system")
implicit val executionContext = actorSystem.dispatcher
implicit val materializer = ActorMaterializer()
val api = new ApiImpl()
api.request2.map(println(_))
}
with versions:
val akkaVersion = "2.6.7"
val akkaHttpVersion = "10.1.12"
Works properly:
HttpResponse(200 OK,List(Date: Mon, 06 Feb 2023 12:19:39 GMT, Connection: keep-alive, Last-Modified: Tue, 17 Jan 2023 13:53:07 GMT, Vary: Accept-Encoding, CF-Cache-Status: DYNAMIC, Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=GZ7HZLwXVyB%2BXRzpcYY4A%2BjpGd0h0S8EsbSRWwMm0b8UbQrnqWpmB8e%2FFEYkNsZUVUdCWboRsWP%2B0aC6YJETfHGZU%2FU%2BFyhetR6%2FA8527KxVKfuGTjpr0Chp"}],"group":"cf-nel","max_age":604800}, NEL: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}, Server: cloudflare, CF-RAY: 7953d5d82a3c384d-MAD, alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400),HttpEntity.Chunked(text/html),HttpProtocol(HTTP/1.1))