Using the Amazon Resource Name (ARN) of a Cloud Development Kit (CDK) resource in a different

Having trouble obtaining the ARN of my AWS CDK stack's Step Functions state machine for my lambda function. The ARN is constantly changing and I'm unsure how to access it.

I attempted to create a .env file alongside the lambda function's index.ts file.

const stateMachine = new stepfunctions.StateMachine(this, 'my-state-machine', {
     definition: waitState,
});

I then tried writing stateMachine.stateMachineArn to the .env file using fs from the CDK stack. However, the result in the .env file and console was ${Token[TOKEN.1056]}. It seems that the ARN is not available at this stage of the CDK stack deployment process. Any suggestions on how to resolve this issue?

typescriptamazon-web-servicesaws-lambdaaws-cdk

Answer №1

Have you considered directly passing stateMachine.stateMachineArn to the lambda function? This can be achieved if both are part of the same stack, by exposing the ARN property from one Construct and referencing it in the lambda.

If the state machine is in a different stack, you may need to export it using new CfnOutput and then import it into your stack using cdk.Fn.importValue

If you plan to use it within the lambda code, remember to pass it as an environment variable to the lambda function.

Answer №2

Utilizing an environment variable seems like the right approach to me. Rather than generating a .env file during deployment to pass the state machine ARN to the lambda function, I suggest incorporating secrets manager or systems manager parameter store, making it a dependency and injecting it into the functions' environment variables.

Although I haven't executed any code for verification, utilizing 

<resource>.addDependency(<other resource>)
may not be necessary at this point. However, it's always good to keep in mind potential deployment order nuances...

import * as cdk from 'aws-cdk-lib'
import * as lambda from 'aws-cdk-lib/aws-lambda'
import * as stepfunctions from 'aws-cdk-lib/aws-stepfunctions'

export class Stack extends cdk.Stack implements cdk.Stack {
  constructor(scope, id, props?: cdk.StackProps) {
    super(scope, id, props)

    const stateMachine = new stepfunctions.StateMachine(this, 'state-machine', {
      definition: waitState,
    })

    const lambda = new lambda.Function(this, 'lambda', {
      environment: {
        STATE_MACHINE_ARN: stateMachine.stateMachineArn,
      },
    })

    lambda.node.addDependency(stateMachine)
  }
}

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