ZIO learning - zhttp - simplest http server / published by https://github.com/dacr/code-examples-manager #a9a3d6d7-41e1-419f-bc6d-2f06930a92b9/71df861d76748650d94f278637404e8f507df6d7

zio-learning-zhttp-server-1.sc

// summary : ZIO learning - zhttp - simplest http server
// keywords : scala, zio, learning, pure-functional, async, http-server, zhttp, @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 : a9a3d6d7-41e1-419f-bc6d-2f06930a92b9
// created-on : 2021-05-27T12:29:29Z
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file
// usage-example : scala-cli zio-learning-zhttp-server-1.sc -- 60
// test-with : curl http://127.0.0.1:8080/

// ---------------------
//> using scala  "3.2.2"
//> using dep "dev.zio::zio-http:3.0.0-RC1"
// ---------------------

import zio.*, zio.http.*, zio.http.Path.root

object Main extends ZIOAppDefault {

  val routes = Http.collect[Request] {
    case Method.GET -> root          => Response.text("Hello World!")
    case Method.GET -> root / "json" => Response.json("""{"greetings": "Hello World!"}""")
  }

  val serverLogic = for {
    config       <- ZIO.config(Server.Config.config)
    port          = config.address.getPort
    _            <- Console.printLine(s"Server listening on http://127.0.0.1:$port/")
    args         <- getArgs
    autoExitDelay = args.headOption.map(_.toInt).getOrElse(5)
    _            <- Console.printLine(s"Auto exiting in $autoExitDelay seconds")
    _            <- Server.serve(routes.withDefaultErrorResponse).timeout(autoExitDelay.seconds)
  } yield ()

  override def run = serverLogic.provideSome[ZIOAppArgs](Server.default) // We do want to provide ZIOAppArgs...
}

Main.main(args)