I'm trying to create a marshaller using Akka Http for a nested map that I
want to return as Json from my Http API together with an appropriate status
code. In the real code the map is coming from a service call that might
fail. I would like to determine the status code based on this service call
result. I have a simple route like this:
implicit val materializer: Materializer
> val map = Map("1" -> Map ("1.1" -> 1.1 ))
val routes = pathPrefix("") {
get {
complete {
service.call match {
case Success(_) => OK -> map
> case Failure(_) => ServiceUnavailable -> map
}
}
}
}
With Spray all I had to do was create a simple marshaller like this:
> implicit val mapMarshaller =
>
> Marshaller.of[Map[String, Any]](`application/json`) { (value,
>> contentType, ctx) =>
>
> ctx.marshalTo(HttpEntity(contentType, toJson(value))) // toJson is
>> just using jackson to transform any object structure to a string
>
> }
>
>
As long this was available in implicit scope it allowed routes like the
above one. With Akka Http I tried something similar:
implicit val mapMarshaller = Marshaller.opaque[Map[String, Any],
>> HttpResponse] { map =>
>
> HttpResponse(entity =
>
> HttpEntity(ContentType(`application/json`, `UTF-8`),
>> JsonUtil.toJson(map))
>
> )
>
> }
>
>
This works if I pass the map directly to the 'complete' block, but not if
I'm combining with status code, like in the route above. So:
complete(OK, Map()) // this works
complete(OK -> Map()) // this does NOT work
I don't want to do the service call outside the complete, because that
makes it execute on startup.
What am I doing wrong? How can I achieve my goal?
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