How can I configure Amazon CDK to trigger a Lambda function after deployment?

Question

I have deployed a Lambda function using Amazon CDK. I would like to invoke this Lambda function automatically every time it is deployed. Is it possible to achieve this using the Amazon CDK construct?

Answer 1

You should be able to do this with a CustomResource similar to below:

const lambdaTrigger = new cr.AwsCustomResource(this, 'MyFunctionTrigger', {
  policy: cr.AwsCustomResourcePolicy.fromStatements([
    new iam.PolicyStatement({
      actions: ['lambda:InvokeFunction'],
      effect: iam.Effect.ALLOW,
      resources: [myFunction.functionArn],
    }),
  ]),
  timeout: Duration.minutes(2),
  onCreate: {
    service: 'Lambda',
    action: 'invoke',
    parameters: {
      FunctionName: myFunction.functionName,
      InvocationType: 'Event',
    },
    physicalResourceId: cr.PhysicalResourceId.of(Date.now().toString()),
  },
  onUpdate: {
    service: 'Lambda',
    action: 'invoke',
    parameters: {
      FunctionName: myFunction.functionName,
      InvocationType: 'Event'
    },
    physicalResourceId: cr.PhysicalResourceId.of(Date.now().toString())
  }
});

By setting the physicalResourceId to the current time on deploy it should trigger it to execute each deployment.