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(core): Stack.exportValue() fails in an inscrutable way when called on a construct

See original GitHub issue

Trying to use .exportValue() to temporarily preserve an output from a stack. Met with a circular dependency when running cdk synth.

Reproduction Steps

import * as cdk from '@aws-cdk/core'
import * as sns from '@aws-cdk/aws-sns'

class SampleStack extends cdk.Stack {
  public readonly snsTopic: sns.Topic

  constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    this.snsTopic = new sns.Topic(this, 'SNS Topic', { topicName: 'sample'})
    this.exportValue(this.snsTopic, {
      name: 'sample',
    })
  }
}

const app = new cdk.App();
new SampleStack(app, 'SampleStack');

What did you expect to happen?

Expected the synth command to work and produce CloudFormation output.

What actually happened?

 % cdk synth

/Users/.../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:127
    throw new Error('Unable to resolve object tree with circular reference. Path: ' + pathName);
          ^
Error: Unable to resolve object tree with circular reference. Path: /Outputs/${Token[SampleStack.Exportsample.LogicalID.22]}/Value/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host/node/host
    at resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:127:11)
    at Object.resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:119:77)
    at resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:230:47)
    at Object.resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:119:77)
    at resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:230:47)
    at Object.resolve (/Users/../cdk-issue/node_modules/@aws-cdk/core/lib/private/resolve.ts:119:77)
...

Environment

CDK CLI Version : 1.116.0 (build d04661d)
Framework Version: 1.116.0
Node.js Version: v14.16.0
OS : macOS 11.5 (20G71)
Language (Version): TypeScript (~3.9.7; resolved to 3.9.10)

Other

Might be specific to SNS Topic? Haven’t tried on other constructs.

This is 🐛 Bug Report

Issue Analytics

State:
Created 2 years ago
Comments:12 (6 by maintainers)

Top GitHub Comments

2reactions

rix0rrrcommented, Aug 9, 2021

To start with, we should just reject calling exportValue on anything that’s an object but not a token.

Second, it’s a good idea to list all values that are being exported from a stack (probably emitted to metadata) so that users can use this information to write matching exportValue() calls.

0reactions

github-actions[bot]commented, Jul 2, 2022

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