apigatewayv2: stateMachineArn does not fit schema for Operation: StepFunctions-StartSyncExecution

[YishaqG]

Describe the bug

I'm trying to create a ApiGatewayV2 route with AWS StepFunction integration. For this I'm using the L1 constructs but getting the following error message:

UPDATE_ROLLBACK_COMPLETE: Parameter: stateMachineArn does not fit schema for Operation: StepFunctions-StartSyncExecution. (Service: AmazonApiGatewayV2; Status Code: 400; Error Code: BadRequestException

Expected Behavior

The creation of the ApiGatewayV2 route with an AWS StepFunction integration

Current Behavior

Stack deployment failure and rollbacked:

UPDATE_ROLLBACK_COMPLETE: Parameter: stateMachineArn does not fit schema for Operation: StepFunctions-StartSyncExecution. (Service: AmazonApiGatewayV2; Status Code: 400; Error Code: BadRequestException

Reproduction Steps

const demoStateMachine = new StateMachine(scope, 'DemoStateMachine', {
    stateMachineType: StateMachineType.EXPRESS,
    definitionBody: 
        DefinitionBody.fromChainable( 
           new Pass(scope, 'PassState')
        ),
});

const role = new Role(scope, 'DemoStateMachineRole', {
    assumedBy: new ServicePrincipal('apigateway.amazonaws.com'),
});

const integration = new CfnIntegration(
    this.scope,
    "DemoStateMachineIntegration",
    {
        apiId: gateway.httpApiId,
        integrationType: HttpIntegrationType.AWS_PROXY,
        integrationSubtype: 'StepFunctions-StartSyncExecution',
        credentialsArn: role.roleArn,
        payloadFormatVersion: PayloadFormatVersion.VERSION_1_0.version,
        requestParameters: {
            stateMachineArn: demoStateMachine.stateMachineArn
        }
    }
);

new CfnRoute(this.scope, 'CheckoutRoute', {
    apiId: gateway.httpApiId,
    routeKey: `${HttpMethod.POST} demo`,
    authorizationType: 'NONE',
    target: `integrations/${integration.ref}`,
});

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.85.0

Framework Version

2.85.0

Node.js Version

16.18.0

OS

macOS 13.4.1

Language

Typescript

Language Version

4.9.5

Other information

No response

[pahud]

Looks like the stateMachineArn is invalid.

requestParameters: {
            stateMachineArn: demoStateMachine.stateMachineArn
        }

Are you able to CfnOutput the value of demoStateMachine.stateMachineArn for troubleshooting?

I guess this might related to #25395 (comment) and a trailing .sync might be required.

[YishaqG]

What I was trying to do here is not related with #25395 (comment) he is trying to use other services from the StepFunction. What I was trying to do was to invoke a StepFunction from ApiGatewayV2

Done, so it looks like you need to specify it as:

    requestParameters: {
        StateMachineArn: demoStateMachine.stateMachineArn,
        Input: '$request.body.input',
    }

[Perminus-Gaita]

Here is the full code with the imports and all the code that works.

import { Stack, StackProps } from 'aws-cdk-lib';
import { Construct } from 'constructs';
import { CfnIntegration, CfnRoute, HttpMethod, PayloadFormatVersion } from 'aws-cdk-lib/aws-apigatewayv2'
import { DefinitionBody, StateMachine, StateMachineType, Pass } from 'aws-cdk-lib/aws-stepfunctions';
import { Role, ServicePrincipal } from 'aws-cdk-lib/aws-iam';
import { HttpIntegrationType, HttpApi } from 'aws-cdk-lib/aws-apigatewayv2';


export class MyStack extends Stack {
  constructor(scope: Construct, id: string, props?: StackProps) {
    super(scope, id, props);

    // ... (your existing code)
    const httpApi = new HttpApi(this, 'MyHttpApi');

    const demoStateMachine = new StateMachine(this, 'DemoStateMachine', {
      stateMachineType: StateMachineType.EXPRESS,
      definitionBody: DefinitionBody.fromChainable(
        new Pass(this, 'PassState')
      ),
    });

    const role = new Role(this, 'DemoStateMachineRole', {
      assumedBy: new ServicePrincipal('apigateway.amazonaws.com'),
    });

    const integration = new CfnIntegration(
      this,
      "DemoStateMachineIntegration",
      {
        apiId: httpApi.httpApiId,
        integrationType: HttpIntegrationType.AWS_PROXY,
        integrationSubtype: 'StepFunctions-StartSyncExecution',
        credentialsArn: role.roleArn,
        payloadFormatVersion: PayloadFormatVersion.VERSION_1_0.version,
        requestParameters: {
            StateMachineArn: demoStateMachine.stateMachineArn,
            Input: '$request.body.input',
        }
      }
    );

    new CfnRoute(this, 'CheckoutRoute', {
      apiId: httpApi.httpApiId,
      routeKey: `${HttpMethod.POST} /demo`,
      authorizationType: 'NONE',
      target: `integrations/${integration.ref}`,
    });
  }
}