Simple http4s http server library example / published by https://github.com/dacr/code-examples-manager #43f85d6d-d575-49b9-9862-71e75c87788f/4b3ee822d4182368e21d5e90f86b8c31dafc0e8e

tapir-zio-http4s-server-hello-world.sc

// summary : Simple http4s http server library example
// keywords : scala, http4s, cats, http-server, tapir, @testable, @exclusive
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 43f85d6d-d575-49b9-9862-71e75c87788f
// created-on : 2024-06-13T14:14:06+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file
// test-with : curl http://127.0.0.1:8080/hi?name=joe

// ---------------------
//> using scala "3.4.2"
//> using dep "com.softwaremill.sttp.tapir::tapir-zio:1.10.9"
//> using dep "com.softwaremill.sttp.tapir::tapir-http4s-server-zio:1.10.9"
//> using dep "com.softwaremill.sttp.tapir::tapir-json-zio:1.10.9"
//> using dep "com.softwaremill.sttp.tapir::tapir-swagger-ui-bundle:1.10.9"
//> using dep "com.softwaremill.sttp.tapir::tapir-openapi-docs:1.10.9"
//> using dep "org.http4s::http4s-blaze-server:0.23.16"
//> using dep "org.slf4j:slf4j-simple:2.0.13"
//> using options -Ykind-projector:underscores
// ---------------------

import cats.syntax.all.*
import org.http4s.*
import org.http4s.blaze.server.BlazeServerBuilder
import org.http4s.server.Router
import org.http4s.implicits.*
import sttp.tapir.PublicEndpoint
import sttp.tapir.generic.auto.*
import sttp.tapir.swagger.bundle.SwaggerInterpreter
import sttp.tapir.server.http4s.ztapir.ZHttp4sServerInterpreter
import sttp.apispec.openapi.Info
import sttp.tapir.ztapir.*
import zio.interop.catz.*
import zio.{Console, Task, ZIO, ZIOAppDefault}
import zio.durationInt

object Hello extends ZIOAppDefault {

  def hiLogic(givenName: Option[String]) = ZIO.succeed(
    givenName match {
      case None       => s"Hi"
      case Some(name) => s"Hi $name"
    }
  )

  val hiEndPoint =
    endpoint
      .description("Returns parameterized greeting")
      .get
      .in("hi")
      .in(query[Option[String]]("name").description("someone name"))
      .out(stringBody)

  val hiEndPointWired = hiEndPoint.zServerLogic[Any](hiLogic)

  val docEndPointWired =
    SwaggerInterpreter()
      .fromServerEndpoints(
        List(hiEndPointWired),
        Info(title = "Greeting API", version = "1.0", description = Some("Everything required to be polite"))
      )

  val routes: HttpRoutes[Task] = ZHttp4sServerInterpreter()
    .from(hiEndPointWired :: docEndPointWired)
    .toRoutes

  def run = {
    ZIO.executor.flatMap(executor =>
      BlazeServerBuilder[Task]
        .withExecutionContext(executor.asExecutionContext)
        .bindLocal(8080)
        .withHttpApp(Router("/" -> routes).orNotFound)
        .serve
        .compile
        .drain
    ).timeout(10.seconds)
  }
}

Hello.main(Array.empty)