finagle/finch

Try Cookbook (goo.gl/tFS8tx) before anything else!

Dino Fancellu

@fancellu

I'm trying to return a 404 with a phrase that is not simple "Not Found"

This doesn't change the phrase

Output.failure(new Exception("Image not found"), Status.NotFound)

NotFound(new Exception("Image not found")

I get a 404 just fine. But I want the phrase to be as in the exception. Raw header is

HTTP/1.1 404 Not Found\r\nDate: Mon, 30 Mar 2020 11:51:40 GMT\r\nServer: Finch\r\nContent-Length: 0\r\n\r\n

Frederick Cai

@zhenwenc

@fancellu Me again 😄 You need to implement your own implicit Encoder[Exception], and ensure it is in scope when calling toService / toServiceAs on your endpoint(s)

See https://finagle.github.io/finch/cookbook.html#converting-errors-into-json

Dino Fancellu

@fancellu

I do

  implicit val encodeException: Encoder[Exception] = Encoder.instance(e =>
    Json.obj("exception" -> Json.fromString(e.getMessage)))

What would I need to do to get it to put the getMessage into the HTTP reason?

Currently it says

HTTP/1.1 404 Not Found

htch

@htch

Why does returning twitter's Future from endpoint with Endpoint[IO,?] type works? Using finchx 0.32.1

For example:

import cats.effect.IO
import com.eslgaming.services.platform.lokalisewebhook.domain.{Event, WebhookError}
import com.eslgaming.services.platform.lokalisewebhook.handler.WebhookEventHandler
import com.twitter.util.Future
import com.twitter.util.logging.Logging
import io.finch.{Endpoint, Output, Ok, NoContent}
//import io.finch.catsEffect._
import io.finch.circe._
import shapeless.HNil
import io.circe.Json
//import io.catbird.util.twitterFutureInstance

object LokaliseWebhookEndpoint extends Logging {

  def apply(ipRangeEndpoint: Endpoint[IO,HNil], webhookEventHandler: WebhookEventHandler): Endpoint[IO,Unit] =
    Endpoint[IO].post(Endpoint[IO].path("webhook") :: ipRangeEndpoint :: Endpoint[IO].jsonBody[Json]) { body: Json =>
      if (body == Json.arr(Json.fromString("ping"))) {
        Future.value(Ok(()))
      } else {
        val event = body.as[Event].getOrElse(throw new RuntimeException())
        webhookEventHandler.handleEvent(event) map {
          case Right(_) => NoContent[Unit]
          case Left(err) => {
            Output.failure(new RuntimeException(err.message), err.status)
          }
        }
      }
    }

}

webhookEventHandler.handleEvent returns a twitter Future

Sergey Kolbasov

@sergeykolbasov

@htch there is an implicit coversion of Twitter Future -> Anything with Async

it lives inside of ToAsync and is available only for method endpoints, such as get("foo") { ... }

Kenneth Monteiro

@ManiacViper

Hello

anyone can point me in the right direction for a finch refined error message

how do i get one in the contentResponse

for paramOption[NonEmptyString]("marketingsource") it returns a BadRequest for a empty string but no error message

these are my imports

import io.finch.refined._
import io.circe.refined._  // needed
import eu.timepit.refined.auto._
import eu.timepit.refined.types.string.NonEmptyString

@kpei

Hey guys, is it possible to flatten up nested Endpoints?

Let's say I have something like

(param[Int]("foo")).map {
   foo: Int => new fooEndpoint(foo)
}

The return type is an Endpoint[Endpoint[SomeResponseClass]]

Sergey Kolbasov

@sergeykolbasov

Hi @ManiacViper

You should define custom Encode[Exception] implicit instance and provide it at the call of .toService. Default encoding of all the exceptons is a blank page

@kpei No, it's not possible as endpoint is not monadic, but applicative. What's your use case?

Dino Fancellu

@fancellu

Does anyone know if Finch supports web sockets? Or some Finagle based code?

I see https://github.com/finagle/finagle-websocket but that project is inactive. Thanks

Nicolas Rinaudo

@nrinaudo

This might be a silly question, but I see:

this: https://github.com/finagle/finch/releases/tag/v0.32.1
no corresponding artifact on maven-central

has this not been pushed to maven central, or is not hosted there anymore?

Dino Fancellu

@fancellu

Any examples of Finch handling file upload? Or Finagle? Thanks

Dino Fancellu

@fancellu

Aha, I see https://finagle.github.io/finch/user-guide.html#multipart

Sergey Kolbasov

@sergeykolbasov

@nrinaudo Are you sure you're checking for finchx artefact? https://index.scala-lang.org/finagle/finch/finchx-core

Nicolas Rinaudo

@nrinaudo

Ah, I'm pretty sure I'm not, I didn't realise the name of the project had changed!

Sergey Kolbasov

@sergeykolbasov

@fancellu Finch doesn't support websockets

@nrinaudo it's a temporary thing, as we've two artifacts atm: with Future and F[_] (or finchx)

Nicolas Rinaudo

@nrinaudo

right. and the one with Future is not being updated anymore?

Sergey Kolbasov

@sergeykolbasov

Next release is going to end the deprecation cycle for Future one and finchx will be gone as well, so there will be only finch

Yeah

Nicolas Rinaudo

@nrinaudo

so if I want support for 2.13, later versions of circe, ... I need to move to finchx temporarily

correct?

Sergey Kolbasov

@sergeykolbasov

yes

Nicolas Rinaudo

@nrinaudo

Understood, thank you.

Dino Fancellu

@fancellu

I have some Option fields in my case class, when they are none the Json from Circe says null. e.g. "eventId":null

How do I tell it to simply emit nothing for that field? Thanks

megri

@megri

@fancellu implicit val printer = Printer.noSpaces.copy(dropNullValues = true)

Actually there's an object in the finch-circe package which should solve this: https://github.com/finagle/finch/blob/master/circe/src/main/scala/io/finch/circe/package.scala#L12-L16

Dino Fancellu

@fancellu

I can't get either to work. i.e. my options are coming back as null still

e.g.

  import io.finch.circe.dropNullValues._

val videoCanned: Endpoint[IO, Video] = get(videoadmin :: "canned") {
    Ok(Video(9999,"canned","url","link", description = "canned"))
  }

But the optional null fields still come back as :null

What am I doing wrong?

Thanks

Dino Fancellu

@fancellu

Ah, got it working, just had to be careful with imports

https://gist.github.com/fancellu/b145ed3a0a27c6a1c414c0d485a44d37

Dermot Haughey

@hderms

anyone know how I can test a finch endpoint in concert with a finagle filter in tests?

is that possible?

Sergey Kolbasov

@sergeykolbasov

@hderms you would need to convert endpoint to service, apply this service to filter and then send a Request in

Dermot Haughey

@hderms

thanks @sergeykolbasov I ended up doing that

I now regret depending on a finagle filter I wrote to guarantee any uncaught exceptions would be formatted the proper way in the response

Sergey Kolbasov

@sergeykolbasov

mm, finch guarantees that compiled endpoint (one that you get with .compile) wouldn't throw within F[_] context and you need to take care only of Either[Throwable, Response]

Dermot Haughey

@hderms

basically I'm trying to integration test our whole stack in a subset of our test cases

so I just wrote some stuff that lets me take an Endpoint and run a test as either a Finch endpoint or compile it to a Finagle service and run it

and it more or less works the same

softshipper

@softshipper

Hi all
Is Finch compatible with https://typelevel.org/cats/?

Ryan Plessner

@rpless

hi @softshipper Finch uses cats internally and brings it into your project transitively. We don't incorporate many of the primitives from cats but there are some ways to

Dermot Haughey

@hderms

so I'm using finch fs2 support, in particular I have an endpoint like post("foo" :: binaryBodyStream[fs2.Stream]) { body: fs2.Stream[IO, Array[Byte]] => //etc... }

which compiles fine and seems to do what I want. However, I am having trouble getting a call to this endpoint to not 404.

Dermot Haughey

@hderms

in the documentation I saw: An [[Endpoint]] that matches chunked requests and lifts their content into a generic so I tried using Transfer-Encoding: chunked as a header, but I haven't had any luck

Dermot Haughey

@hderms

seems like withStreaming(true) was the missing link in this case

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