Calling a service name using RestClient, HttpInterfaces and Eureka

Question

I've been using RestClient and HttpInterfaces in Spring Boot 3.2 to make calls to different external and internal services. Now I want to introduce spring cloud for service discovery to call the internal services and I can't figure out how to declare the RestClient to use service names instead of hardcoded URLs.

This is the http interface I have at the moment:

public interface UsersApi {

    @GetExchange("/users")
    ResponseEntity<List<UserDTO>> getUsers();

    @GetExchange("/users/{userId}")
    ResponseEntity<UserDTO> getUser(@PathVariable UUID userId);

}

And this is my Rest Client configuration:

@Configuration
public class RestClientConfig {

        @Bean
    UsersApi usersApi(){

            RestClient restClient = RestClient.builder().baseUrl("https://hardcoded.user-service.url/").build();
            RestClientAdapter adapter = RestClientAdapter.create(restClient);
            HttpServiceProxyFactory factory = HttpServiceProxyFactory.builderFor(adapter).build();
            return factory.createClient(UsersApi.class);
    }
}

I know OpenFeign can be used to call service names with eureka using @FeignClient(name = "service-name", but since I'm already using RestClient to call external services I'd prefer to stick to using RestClient.

Also I've looked at the documentation for Spring Cloud and RestClient here: https://docs.spring.io/spring-cloud-commons/reference/spring-cloud-commons/common-abstractions.html#rest-client-loadbalancer-client, but it does so definining the uri manually per method call (not as a baseUrl) and without using HttpInterfaces

Answer 1

Just use a @LoadBalanced RestClient.Builder in your RestClientConfig. You can find it set up in a working sample here with the @LoadBalanced RestClient.Builder being configured here.