How do you invoke a lambda inside another lambda using Micronaut

[luiscm]

Dear friends

Because using AWS API is done like this below:
I would like if someone can help me with this detail using Micronaut.
I would like a helloworld project about this

public static final String LAMBDA_FUNCTION_NAME = "lambdaToBeInvoked";
public static final String DEFAULT_LAMBDA_REGION = "us-east-1";

private void invokeLambda(String keyName, String bucketName) throws JSONException {

    JSONObject payloadObject = new JSONObject();
    payloadObject.put("keyName", keyName);
    payloadObject.put("bucketName", bucketName);

    String payload = payloadObject.toString();

    logger.info("Payload: " + payload);
    logger.info("Invoking Lambda: " + LAMBDA_FUNCTION_NAME);

    AWSLambda client = AWSLambdaAsyncClient.builder().withRegion(DEFAULT_LAMBDA_REGION).build();

    InvokeRequest request = new InvokeRequest();
    request.withFunctionName(LAMBDA_FUNCTION_NAME).withPayload(payload);
    InvokeResult invoke = client.invoke(request);
    logger.info("Result invoking " + LAMBDA_FUNCTION_NAME + ": " + invoke);
}

[jeffscottbrown]

@luiscm Does that code do what you expect it to do?

Are you looking for something in the Micronaut framework that will simplify that?

Thanks for any clarification.

[luiscm]

I just wanted a demo project in Java.

[jeffscottbrown]

I will create an example that renders "hello world" and will upload it for you.

[luiscm]

Thanks, wait...

[jeffscottbrown]

See the project at github.com/jeffbrown/luiscmfunctionclient.

src/main/resources/application.yml:

micronaut:
  application:
    name: luiscmfunctionclient
aws:
  lambda:
    functions:
      helloworld: {}
    region: us-east-2
  accessKeyId: accessKeyGoesHere
  secretKey: secretKeyGoesHere

If I enter valid accessKeyId and secretKey, that application successfully invokes the expected Lambda.

~ $ http :8080/greet/Luis
HTTP/1.1 200 OK
connection: keep-alive
content-length: 39
content-type: application/json
date: Tue, 13 Jul 2021 19:21:53 GMT

{
    "greeting": "Hello Luis",
    "name": "Luis"
}

~ $ 
~ $ http :8080/greet/Jeff
HTTP/1.1 200 OK
connection: keep-alive
content-length: 39
content-type: application/json
date: Tue, 13 Jul 2021 19:21:56 GMT

{
    "greeting": "Hello Jeff",
    "name": "Jeff"
}

[jeffscottbrown]

The client is at src/main/java/example/micronaut/HelloClient.java:

package example.micronaut;

import io.micronaut.function.client.FunctionClient;

import javax.inject.Named;
import java.util.Map;

@FunctionClient
public interface HelloClient {
    @Named("helloworld")
    String greet(Map info);
}

[luiscm]

Dear Jeff I was guessing that Micronaut would have a method to do it like I do in AWS API. In this example you make an app by calling a functionclient I wanted a functionclient calling another functionclient, not as an application. Do I have a way to do it or not? Or it has to be the way the framework works.

…

On Tue, Jul 13, 2021 at 4:26 PM Jeff Scott Brown ***@***.***> wrote: The client is at src/main/java/example/micronaut/HelloClient.java <https://github.com/jeffbrown/luiscmfunctionclient/blob/972346efe5b3fc8ef3f63e0f3331b522410c6966/src/main/java/example/micronaut/HelloClient.java> : package example.micronaut; import io.micronaut.function.client.FunctionClient; import javax.inject.Named; import java.util.Map; @FunctionClient public interface HelloClient { @nAmed("helloworld") String greet(Map info); } — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#5724 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AACL4I63V3WB56TQW34JWXTTXSHPFANCNFSM5AA4PF3Q> .

[jeffscottbrown]

Can you simply @Inject the client into your request handler?

[jeffscottbrown]

@luiscm Is injecting the client into your request handler sufficient to accomplish whatever it is you would like to accomplish?

[sdelamo]

I have written a documentation snippet here: https://micronaut-projects.github.io/micronaut-aws/latest/guide/#lambdafunctionclient