ZIO learning - massive scalability thanks to fibers a very dangerous silly example / published by https://github.com/dacr/code-examples-manager #25431f87-4eeb-4a0e-9b8a-9b2165543f4b/aff721533e32501ba1053611a0813d1f83c01cbe

zio-learning-15-massive-scalability.sc

// summary : ZIO learning - massive scalability thanks to fibers a very dangerous silly example
// keywords : scala, zio, learning, pure-functional, dos, loadtest
// publish : gist
// authors : David Crosson
// license : Apache License Version 2.0 (https://www.apache.org/licenses/LICENSE-2.0.txt)
// id : 25431f87-4eeb-4a0e-9b8a-9b2165543f4b
// created-on : 2021-04-06T09:46:48+02:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : scala-cli $file
// usage-example : scala-cli zio-learning-15-massive-scalability.sc -- http://127.0.0.1:8090/

// ---------------------
//> using scala "3.4.2"
//> using dep "dev.zio::zio:2.0.13"
// ---------------------

/*
 inspired from
   - [John A De Goes - ZIO: Next-Generation Effects in Scala](https://www.youtube.com/watch?v=mkSHhsJXjdc)
 */

import zio.*

object MassiveLoad extends ZIOAppDefault {

  // TODO - of course rewrite to use an async http client...
  override def run = for {
    args       <- getArgs
    target      = args.headOption.getOrElse("http://127.0.0.1:8090/")
    loadTester  = ZIO.attemptBlockingIO(scala.io.Source.fromURL(target).getLines().mkString("\n"))
    loadTesters = List.fill(20_000)(loadTester)
    _          <- ZIO.collectAllPar(loadTesters).as(())
  } yield ()
}
// -------------------------------------------------------------
MassiveLoad.main(args)