How to auto generate a required attribute value while creating an L2 construct

[clementallen]

I am looking to implement a Level 2 Construct for a Kinesis Stream Consumer, and am a bit stuck generating a value for the consumerName property if it is not provided during instantiation.

What is the typical approach used when an attribute is required, but Cloudformation doesn't handle the automatic generation?

I am playing around with using consumerName: this.physicalName, but suspect I need to auto generate the physical name if a custom name isn't provided to the construct.

Docs: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-kinesis-streamconsumer.html#cfn-kinesis-streamconsumer-consumername