How do I manage Lambda versions with CDK?

Question

I have an infrastructure with multiple accounts (prod, dev, staging) using CDK. Recently, one of my functions underwent a major change. Therefore, I need to publish the new version without deleting the old one, but I couldn't find a reliable resource on how to do this. My requests should look like this:

* example.com/v1/users
* example.com/v2/users

The points where I'm confused are as follows:

Let's say I created a new version in my dev account (v2). Later, I created another version (v3) without deploying it to my prod account. In this case, v2 and v3 would be the same. Since I haven't deployed to my prod account yet, it will take the latest code for the v2 version. Is duplicating the code a good idea to manage this situation? For example:

* lambda/users/v1
* lambda/users/v2
* lambda/users/v3

Should I have different versions of the code like this?

Answer

I don't think you need to duplicate the Lambda source code; just create a second CDK resource referencing the same code.

You can also use the `version` construct to explicitly define function versions and then deploy those, using your own environment management logic as appropriate: https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_lambda.Version.html

How do I manage Lambda versions with CDK?

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