IsbnDbCommands.groovy

public Promise<String> getBookRequest(final String isbn) {
    def uri = "${config.host}/api/v2/json/${config.apikey}/book/$isbn".toURI()

    httpClient
        .get(uri)
        .map { ReceivedResponse resp ->
            if (resp.body.text.contains("Daily request limit exceeded")) {
                throw new RuntimeException("ISBNDB daily request limit exceeded.")
            }
            resp.body.text
        }
}