I have an http4s HttpRoutes
and a task in my effect type (ZIO, if that matters). The effect is side-effecting and returns no value. I want to compose the two together, creating a new HttpRoutes
that will run the effect before any matching route in the HttpRoutes
.
import zio.Task
val httpRoutes: HttpRoutes[Task] = ...
val effect: Task[Unit] = ...
val combined: HttpRoutes[Task] = ???
How do I combine the HttpRoutes
and the effect together?
Naive implementation according to https://http4s.org/v0.21/middleware
works for me
@accessible
trait HttpServer {
def bindHttp: UIO[Server[Task]]
}
object HttpServer {
def make(
httpRoutes: HttpRoutes[Task],
cpuPool: ExecutionContext@Id("zio.cpu"),
) = {
for {
implicit0(rts: Runtime[Any]) <- ZIO.runtime[Any].toManaged_
combined = Kleisli { (req: Request[Task]) =>
val effect: Task[Unit] = Task.effectTotal(println("123"))
OptionT.liftF(effect).flatMap { _ =>
httpRoutes(req)
}
}
srv <- BlazeServerBuilder[Task](cpuPool)
.withHttpApp(combined.orNotFound)
.bindHttp(host = "0.0.0.0")
.resource
.toManaged
} yield new HttpServer {
val bindHttp = IO.succeed(srv)
}
}
}