http4s example

http4sApp.scala

package org.app

import scalaz._
import Scalaz._
import scala.concurrent.{ExecutionContext, Future}
import org.http4s._ // v0.4.0
import org.http4s.dsl._
import org.http4s.server._
import org.http4s.server.blaze.BlazeBuilder
import org.slf4j.{Logger,LoggerFactory}
import scala.util.Properties.envOrNone

trait Logging { protected lazy val log = LoggerFactory.getLogger(this.getClass) }
object X extends ParamMatcher("x")
object Y extends ParamMatcher("y")

class App(hostname: String = "localhost", port: Int = 9999)(implicit ec: ExecutionContext = ExecutionContext.global) extends Logging {
  def run = BlazeBuilder.bindHttp(port, hostname).mountService(service, "/").run.awaitShutdown()
  def logreq(r: Request): Unit = log.info(s"${r.remoteAddr.getOrElse("null")} -> ${r.method}: ${r.uri.path} ${r.uri.query}")

  lazy val service = HttpService {
    case req @ GET -> Root / "blah" :? X(x0) +& Y(y0) =>
      logreq(req)
      log.info(s"x0=${x0}, y0=${y0}")
      Ok("x = " + x0 + "\n" + "y = " + y0)
    case req =>
      logreq(req)
      NotFound("404: not found")
  }
}

object App extends Logging {
  val hostname = envOrNone("HOSTNAME").getOrElse("localhost")
  val port = envOrNone("HTTP_PORT").map(_.toInt).getOrElse(8080)
  def main(args: Array[String]): Unit = {
    log.info(s"starting http4s-blaze example on '$hostname:$port'")
    new App(hostname,port).run
  }
}