Is it possible to use Sttp on Scala native?

sttp client
1

I’m trying to use Sttp 3 client in Scala native project.
I’ve added these dependencies:

      "com.softwaremill.sttp.client3" %% "async-http-client-backend-cats" % "3.8.15",
      "com.softwaremill.sttp.client3" % "cats_native0.4_3" % "3.8.15"

And in my code I’m trying to get backend using:

    HttpClientCatsBackend.resource[IO]().use(backend =>
      IO.println("test").map(_ => ExitCode.Success)
    )

But I’m getting these errors:

[error] Not found Top(sttp.client3.httpclient.cats.HttpClientCatsBackend$)
[error] Not found Member(Top(sttp.client3.httpclient.cats.HttpClientCatsBackend$),D18resource$default$1L31sttp.client3.SttpBackendOptionsEO)
[error] Not found Member(Top(sttp.client3.httpclient.cats.HttpClientCatsBackend$),D18resource$default$2L15scala.Function1EO)
[error] Not found Member(Top(sttp.client3.httpclient.cats.HttpClientCatsBackend$),D18resource$default$3L21scala.PartialFunctionEO)
[error] Not found Member(Top(sttp.client3.httpclient.cats.HttpClientCatsBackend$),D8resourceL31sttp.client3.SttpBackendOptionsL15scala.Function1L21scala.PartialFunctionL24cats.effect.kernel.AsyncL27cats.effect.kernel.ResourceEO)

Is it possible to use client on Scala native? If so, are there any example repos or documentation?

2

@sergeda The async-http-client-backend-* backend family is not built for scala native. If I read the project correctly, the only supported native backend right now is fs2, could you try it?

3

Thank you @kciesielski
I updated my imports with

      "com.softwaremill.sttp.client3" %% "async-http-client-backend-fs2" % "3.8.15",
      "com.softwaremill.sttp.client3" % "fs2_native0.4_3" % "3.8.15"

but got similar errors:

[error] Not found Top(sttp.client3.httpclient.fs2.HttpClientFs2Backend$)
Member(Top(sttp.client3.httpclient.fs2.HttpClientFs2Backend$),D18resource$default$1L31sttp.client3.SttpBackendOptionsEO)
Member(Top(sttp.client3.httpclient.fs2.HttpClientFs2Backend$),D18resource$default$2L15scala.Function1EO)
Member(Top(sttp.client3.httpclient.fs2.HttpClientFs2Backend$),D18resource$default$3L21scala.PartialFunctionEO)
Member(Top(sttp.client3.httpclient.fs2.HttpClientFs2Backend$),D8resourceL31sttp.client3.SttpBackendOptionsL15scala.Function1L21scala.PartialFunctionL24cats.effect.kernel.AsyncL27cats.effect.kernel.ResourceEO)

Maybe I’m doing something wrong because I saw mentions about usages of sttp client in Scala Native. Just can’t find any working example.

4

Sorry for misleading, the cats backend you used in your previous question also supports native platform, just like fs2. It’s just the first dependency - async-http-client-backend-* which is unneeded, but let me confirm the exact setup.

1 Like
5

I’m getting this error when I’m removing “async-http-client-backend-*” dependency:

[error] 9 |import sttp.client3.httpclient.fs2.HttpClientFs2Backend
[error]   |       ^^^^^^^^^^^^^^^^^^^^^^^
[error]   |       value httpclient is not a member of sttp.client3
[error] one error found
[error] (Compile / compileIncremental) Compilation failed

So, not sure where to get the required backend import

6

@sergeda It turns out mentioned modules are available for native, but they don’t offer full backends. The only backend supported currently on Native is CurlBackend Curl backend — sttp 3 documentation

1 Like
7

@kciesielski Thank you. Will try this