get-stack-value.js

function getServerlessStackName(service, provider) {
  return `${service.getServiceName()}-${provider.getStage()}`;
}

function getValue(service, provider, value, name) {
  if (typeof value === 'string') {
    return Promise.resolve(value);
  } else if (value && typeof value.Ref === 'string') {
    return provider
      .request(
        'CloudFormation',
        'listStackResources',
        {
          StackName: getServerlessStackName(service, provider),
        },
      )
      .then((result) => {
        const resource = result.StackResourceSummaries.find(r => r.LogicalResourceId === value.Ref);
        if (!resource) {
          throw new Error(`${name}: Ref "${value.Ref} not found`);
        }

        return resource.PhysicalResourceId;
      });
  }

  return Promise.reject(new Error(`${value} is not a valid ${name}`));
}

module.exports = {
  getServerlessStackName,
  getValue,
};