Debugging lambda locally using cdk not sam

Question

AWS CDK provides great features for developers. Using CDK deveolper can manage not only total infrastructure but also security, codepipeline, ...

However I recently struggling something. I used to debug lambda using SAM for local debugging. I know how to set up CDK environment, and debug CDK application itself. But I can't figure out how to debug lambda application inside CDK.

Can anyone help me?

Answer 1

As of 4/29/2021, there's an additional option for debugging CDK apps via SAM. It's in preview but this blog post covers it : https://aws.amazon.com/blogs/compute/better-together-aws-sam-and-aws-cdk/.

Basically, install the AWS CLI and AWS CDK. The install the SAM CLI - beta, available here : https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-cdk-getting-started.html.

Then you can run command's like:

sam-beta-cdk build sam-beta-cdk local invoke sam-beta-cdk local invoke start-api and even emulate the Lambda service with sam-beta-cdk local start-lambda

Answer 2

You can use SAM and CDK together as described here. In particular:

1. Run your AWS CDK app and create a AWS CloudFormation template

   cdk synth --no-staging > template.yaml

2. Find the logical ID for your Lambda function in template.yaml. It will look like MyFunction12345678, where 12345678 represents an 8-character unique ID that the AWS CDK generates for all resources. The line right after it should look like: Type: AWS::Lambda::Function

3. Run the function by executing:

   sam local invoke MyFunction12345678 --no-event