mapRouteResultWith

Signature

def mapRouteResultWith(f: RouteResult

Description

Changes the message the inner route sends to the responder.

The mapRouteResult directive is used as a building block for Custom Directives to transform the RouteResult coming back from the inner route. It’s similar to the mapRouteResult directive but returning a Future instead of a result immediately, which may be useful for longer running transformations.

See Result Transformation Directives for similar directives.

Example

Scala
Java
sourcecase object MyCustomRejection extends Rejection
val rejectRejections = // not particularly useful directive
  mapRouteResultWith {
    case Rejected(_) => Future(Rejected(List(AuthorizationFailedRejection)))
    case res         => Future(res)
  }
val route =
  rejectRejections {
    reject(MyCustomRejection)
  }

// tests:
Get("/") ~> route ~> check {
  rejection shouldEqual AuthorizationFailedRejection
}
sourceimport static org.apache.pekko.http.javadsl.server.Directives.mapRouteResultWith;

import static org.apache.pekko.http.javadsl.server.Directives.mapRouteResultWith;
import static org.apache.pekko.http.javadsl.server.Directives.reject;

final Route route =
    mapRouteResultWith(
        rr ->
            CompletableFuture.supplyAsync(
                () -> {
                  if (rr instanceof Rejected) {
                    final Iterable<Rejection> rejections =
                        Collections.singletonList(Rejections.authorizationFailed());
                    return RouteResults.rejected(rejections);
                  } else {
                    return rr;
                  }
                }),
        () -> reject(new MyCustomRejection()));

// tests:
runRouteUnSealed(route, HttpRequest.GET("/"))
    .assertRejections(Rejections.authorizationFailed());
1.0.1