CODEWITHSUNDEEP
scalacirceziosttp
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Reputation: 1462

Scala, ZIO, Sttp, Circe - how to map error response to custom trait in sttp client using circe?

I have a simple sttp client implementation:

  basicRequest.auth
    .get(...)
    .response(asJsonEither[GeneralTrait, MyResponse])
    .send(backend)
    .map(_.body.left.map {
      case HttpError(body, statusCode) => mapToTraitImplementation(statusCode, body)
      case DeserializationException(_, _) => SomeSerializationError(s"Deserialization error")
    })
    .flatMap(ZIO.fromEither(_))

GeneralTrait looks like:

sealed trait GeneralTrait extends Throwable

And it has few same structure implementations:

final case class FirstError(msg: String, code: Int) extends GeneralTrait

But when I run this client, I always get an error DeserializationException because it could not parse error response to GeneralTrait. When I changed this:

.response(asJsonEither[GeneralTrait, MyResponse])

to

.response(asJsonEither[FirstError, MyResponse])

everything is mapped correctly and it does not return DeserializationException, it chooses first case HttpError(body, statusCode) =>. But I have multiple implementations of this trait and I would like to have trait here if it is possible:

.response(asJsonEither[GeneralTrait, MyResponse])

How should I fix this? Is it even possible to do that?

EDIT: I'm using Circe serialization. I also added Codecs:

  implicit val decoderGeneralTrait: Codec[GeneralTrait] = deriveConfiguredCodec
  implicit val decoderFirstError: Codec[FirstError] = deriveConfiguredCodec

Upvotes: 1

Views: 264

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