ZIO http4s Simple Example
Here's how to put toghether almost the simplest http4s server with ZIO.
Run:
sbt run
Try:
curl localhost:8080/hello
Dependencies:
"org.http4s" %% "http4s-blaze-server" % "1.0.0-M4",
"org.http4s" %% "http4s-dsl" % "1.0.0-M4",
"dev.zio" %% "zio" % "1.0.1",
"dev.zio" %% "zio-interop-cats" % "2.1.4.0"Code:
package com.hunorkovacs.ziohttp4stry
import zio._
import zio.console._
import zio.interop.catz._
import zio.interop.catz.implicits._
import org.http4s._
import org.http4s.dsl.Http4sDsl
import org.http4s.implicits._
import org.http4s.server.blaze.BlazeServerBuilder
object Main extends App {
private val dsl = Http4sDsl[Task]
import dsl._
private val helloWorldService = HttpRoutes
.of[Task] {
case GET -> Root / "hello" => Ok("Hello, Joe")
}
.orNotFound
def run(args: List[String]): zio.URIO[zio.ZEnv, ExitCode] =
ZIO
.runtime[ZEnv]
.flatMap { implicit runtime =>
BlazeServerBuilder[Task](runtime.platform.executor.asEC)
.bindHttp(8080, "localhost")
.withHttpApp(helloWorldService)
.resource
.toManagedZIO
.useForever
.foldCauseM(
err => putStrLn(err.prettyPrint).as(ExitCode.failure),
_ => ZIO.succeed(ExitCode.success)
)
}
}random keywords:
zio, instead of cats, cats-effect, final tagless, http4s, http server, managed, resource, effect tracking, typesafe, strongly typed, functional, monad