Finagle HTTP routing example

MyApp.scala

import com.twitter.finagle.http.{HttpMuxer, Request, Response}
import com.twitter.finagle.Http
import com.twitter.finagle.Service
import com.twitter.finagle.http.service.RoutingService
import com.twitter.finagle.http.path._
import com.twitter.finagle.http.Method
import com.twitter.util.{Await, Future}

class IndexHandler extends Service[Request, Response] {
  def apply(req: Request): Future[Response] = {
    val r = req.response
    r.setStatusCode(200)
    r.setContentString("Hello world!")
    Future.value(r)
  }
}

class GreetHandler(val name: String) extends Service[Request, Response] {
  def apply(req: Request): Future[Response] = {
    val r = req.response
    r.setStatusCode(200)
    r.setContentString("Hello " + name)
    Future.value(r)
  }
}

object HttpRouter {
  def byRequest[REQUEST](routes: PartialFunction[Request, Service[REQUEST, Response]]) =
    new RoutingService(
      new PartialFunction[Request, Service[REQUEST, Response]] {
        def apply(request: Request)       = routes(request)
        def isDefinedAt(request: Request) = routes.isDefinedAt(request)
      })
}

object MyApp extends App {

  val routingService =
    HttpRouter.byRequest { request =>
      (request.method, Path(request.path)) match {
        case Method.Get -> Root                  => new IndexHandler()
        case Method.Get -> Root / "hello" / name => new GreetHandler(name)
      }
    }

  HttpMuxer.addRichHandler("/", routingService)

  val server = Http.serve("0.0.0.0:8000", HttpMuxer)
  Await.ready(server)
}