Reduce CfnParameters for lambda.Function

[artyom-melnikov]

• I'm submitting a ...

  • 🚀 feature request

• What is the current behavior?

Currently for each lambda 2 CfnParameters are created (LambdaSourceBucketNameParameter and LambdaSourceObjectKeyParameter)

As you can see here: https://github.com/awslabs/aws-cdk/blob/4a0272db5eb9aae5f440bb0813fdbad6514b60c3/packages/%40aws-cdk/aws-lambda/lib/code.ts#L209

CloudFormation has a limitation of 60 parameters, meaning we can only have 30 lambda functions in a single stack

• What is the expected behavior (or behavior of feature suggested)?

Add an ability to suppress creation of these parameters, or at least check for the duplicated values (for example LambdaSourceBucketNameParameter is duplicated in my case, since all lambda code assets are uploaded to the same CDKToolkit S3 bucket)

• What is the motivation / use case for changing the behavior or adding this feature?

Do not add the additional limitations

• Please tell us about your environment:

  • CDK CLI Version: 0.31.0 (build 7a70c08)
  • Module Version: xx.xx.xx
  • OS: all
  • Language: TypeScript

[skinny85]

Hey @artyom-melnikov ,

thanks for opening the issue. You can reduce the number of created parameters by either:

a) re-using the same CfnParametersCode for multiple Lambda functions (they can have a different entrypoints, set with the handler property)
b) using explicit parameters provided when creating the CfnParametersCode, like this:

lambda.Code.cfnParameters({
  bucketNameParam: yourParam1,
  objectKeyParam: yourParam2,
});

(both bucketNameParam and objectKeyParam are optional construction properties of CfnParametersCode)

Hope this helps,
Adam

[artyom-melnikov]

This indeed helped, thanks