Created
March 1, 2019 07:45
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Http4s example with ZIO
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| import cats.effect | |
| import scalaz.zio._ | |
| import scalaz.zio.interop.catz._ | |
| import org.http4s._ | |
| import org.http4s.dsl.io._ | |
| import org.http4s.implicits._ | |
| import org.http4s.server.Router | |
| import org.http4s.server.blaze.BlazeServerBuilder | |
| import scalaz.zio.clock.Clock | |
| import scala.concurrent.duration.{FiniteDuration, NANOSECONDS, TimeUnit} | |
| object ZioDemo extends App { | |
| implicit val ioTimer: effect.Timer[Task] = new effect.Timer[Task] { | |
| override def clock: effect.Clock[Task] = new effect.Clock[Task] { | |
| override def realTime(unit: TimeUnit): Task[Long] = | |
| scalaz.zio.clock.currentTime(unit) | |
| .provide(Clock.Live) | |
| override def monotonic(unit: TimeUnit): Task[Long] = | |
| scalaz.zio.clock.nanoTime.map(unit.convert(_, NANOSECONDS)) | |
| .provide(Clock.Live) | |
| } | |
| override def sleep(duration: FiniteDuration): Task[Unit] = | |
| scalaz.zio.clock.sleep(scalaz.zio.duration.Duration.fromNanos(duration.toNanos)) | |
| .provide(Clock.Live) | |
| } | |
| def run(args: List[String]): ZIO[Environment, Nothing, Int] = { | |
| def endpoints: HttpApp[Task] = { | |
| def service = HttpRoutes.of[Task] { | |
| case GET -> Root / "echo" / "ready" => Task(Response[Task](Status.Ok)) | |
| case GET -> Root / "echo" / "alive" => Task(Response[Task](Status.Ok)) | |
| } | |
| Router("/" -> service).orNotFound | |
| } | |
| for { | |
| config <- Configuration[Task].flatMapError(IO.die) | |
| exitCode <- BlazeServerBuilder[Task] | |
| .bindHttp(config.http.port, config.http.host) | |
| .withHttpApp(endpoints).resource.use(_ => IO.never) | |
| .either | |
| .map(_.fold(_ => 1, _ => 0)) | |
| } yield exitCode | |
| } | |
| } |
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