Circe (un)marshaller for spray

CirceSupport.scala

import java.util.NoSuchElementException

import io.circe._
import spray.httpx.marshalling.Marshaller
import spray.httpx.unmarshalling.Unmarshaller
import spray.http._

// scalastyle:off
// providing return types causes a stack overflow, and the throw is necessary in this case

trait CirceSupport {
  implicit def circeUnmarshaller[T: Decoder] = {
    Unmarshaller[T](MediaTypes.`application/json`) {
      case x: HttpEntity.NonEmpty =>
        val json = jawn.parse(x.asString)
        try json.flatMap(_.as[T]).toOption.get
        catch {
          case nsee: NoSuchElementException => throw new IllegalRequestException(StatusCodes.UnprocessableEntity)
        }
    }
  }

  implicit def circeMarshaller[T: Encoder] = {
    Marshaller.delegate[T, String](ContentTypes.`application/json`) { value =>
      implicitly[Encoder[T]].apply(value).noSpaces
    }
  }
}

// scalastyle:on

object CirceSupport extends CirceSupport