AWS lambda enrich / modify input object

Question

Usually you need to do something with InputPath, ResultPath and OutputPath to process your data.
But sometimes you need something as simple as modifying a property in your input object, like camel do with Message EIP or Enricher EIP
Is there an option to eliminate the configuration overhead?

Answer 1

Consider the approach with Jackson tree model:

public class MyHandler extends JsonHandler<ObjectNode> {

    @Override
    public ObjectNode handleRequest(ObjectNode json, Context context) {
        // enrich or modify the input
        json.putPOJO("enriched", pojo);
        // return (the same) modified input object
        return json;
        // or replace it with something totally different
        // return "Some other POJO";
    }
}

Where JsonHandler parent class is defined as

public abstract class JsonHandler<R> implements RequestStreamHandler, RequestHandler<ObjectNode, R> {
    
    private ObjectMapper objectMapper = new ObjectMapper();

    @Override
    public void handleRequest(InputStream input, OutputStream output, Context context) throws IOException {
        ObjectNode json = (ObjectNode) objectMapper.readTree(input);
        R result = handleRequest(json, context);
        output.write(objectMapper.writeValueAsString(result).getBytes());
    }

    @Override
    public abstract R handleRequest(ObjectNode json, Context context);
}