gistfile1.scala

lazy val conversationRoutes: Route = {
  concat(
    pathPrefix(version / "conversation" / LongNumber) { conversationID =>
      post {
        entity(as[PostMessageRequest]) {
          pmr =>
            val maybeSessionGranted: Future[SessionEvent] =
              getSession(conversationID, pmr.userID)

            onComplete(maybeSessionGranted) {
              case Success(SessionGranted(session)) =>
                postMessage(conversationID, pmr.userID, pmr.message)(session)
                complete(OK, PostMessageResponse(pmr.message))
              case Failure(ex) =>
                complete(InternalServerError -> ex)
              case _ => complete(InternalServerError, "An unknown error occurred")
            }
        }
      }
    },
...