http4s example service

ExampleService.scala

object BmpService {

  // A Router can mount multiple services to prefixes.  The request is passed to the
  // service with the longest matching prefix.
  def service(implicit executionContext: ExecutionContext = ExecutionContext.global): HttpService = Router(
    "/api" -> apiService,
  )
  
  def apiService(implicit executionContext: ExecutionContext) = HttpService {
    case req @ GET -> Root =>
      // Supports Play Framework template -- see src/main/twirl.
      Ok(html.index())

    case _ -> Root =>
      // The default route result is NotFound. Sometimes MethodNotAllowed is more appropriate.
      MethodNotAllowed()

    case GET -> Root / "ping" =>
      // EntityEncoder allows for easy conversion of types to a response body
      Ok("pong")

    case GET -> Root / "future" =>
      // EntityEncoder allows rendering asynchronous results as well
      Ok(Future("Hello from the future!"))

    case GET -> Root / "streaming" =>
      // Its also easy to stream responses to clients
      Ok(dataStream(100))

    case req @ GET -> Root / "ip" =>
      // Its possible to define an EntityEncoder anywhere so you're not limited to built in types
      val json = Json.obj("origin" -> Json.string(req.remoteAddr.getOrElse("unknown")))
      Ok(json)
  }

}