invoking aws lambda functions locally with node aws sdk

Question

I am fairly new running lambda functions locally with sam. I have this project setup where a "node express app" acts as an middleware between internet (api gateway) and other lambda functions.

based on resource path another lambda function is invoked.

invocation code block:

const { Lambda } = require ("@aws-sdk/client-lambda");
const client = new Lambda({region: "eu-central-1"});
const input = { 
                FunctionName: "My-func",
                InvocationType: "RequestResponse",
                Payload: JSON.stringify(payload)
            };
client.invoke(input);

My-func is a java based lambda function.

This setup works all fine on lambda but when running locally there are few issues that i am unable to fix. following the below setup.

i am using sam to run my lambda functions. running my java function (My-func) as sam local start-lambda -t my-func.yaml which runs the lambda on 127.0.0.1:3001.

Now i am trying to invoke this function from my nodejs app, i read some github issues from aws sdk repo to specify the endpoint in lambda client initialization config like

const client = new Lambda({apiVersion: '2015-03-31', endpoint: 'http://127.0.0.1:3001/' });

and use the same code as above to invoke the function. but this does not work fails with error: '$metadata': { attempts: 1, totalRetryDelay: 0 } (net.js:1144:16) { ERROR Error: connect ECONNREFUSED 127.0.0.1:3001

please help me in figuring out how to invoke one lambda function from another running locally.

Thanks in advance.

Answer 1

running my lambda function as sam local start-lambda -t my-func.yaml --host 0.0.0.0 and modify the lambda config to use dockers ip 172.17.0.1 as endpoint worked const client = new Lambda({region: "eu-central-1", apiVersion: '2015-03-31', endpoint: 'http://172.17.0.1:3001' });