Thursday, January 30, 2020

Building enterprise applications using Amazon DynamoDB, AWS Lambda, and Go

I found this blog entry with a very good example and walkthrough of a serverless hotel site:
Building enterprise applications using Amazon DynamoDB, AWS Lambda, and Go

Takeaways (from the link above)

Some key takeways from building this demo:

  • Use infrastructure as code – Use CloudFormation, CDK, or Amplify to script your architecture. Moving a large application infrastructure created manually through the AWS console to an infrastructure as code model is a tedious process.
  • Sanitize your user inputs – Do this before using them as parameters to search for partition keys or sort keys. Otherwise, you could end up spending an hour debugging before finding logs with simple typographical errors. (beware the dreaded white space at the start of a PK or SK)
  • Separate your storage model from your business model – This greatly increases code reusability.
  • Build wrapper functions on top of AWS SDK – The DynamoDB SDK service team is constantly adding new features, so you can expect the SDK to become more complex over time. You do not necessarily need all its features at all times. Design simple wrapper functions of the most frequent use cases. This also allows you to reuse code for similar projects so you can jump-start a new project quicker.
  • Beware of permissions settings – AWS provides a granular set of permissions capabilities through IAM. If something does not work out of the box, check first that your Amazon EC2 instance or Lambda function execution role has the appropriate permissions.
  • Watch out for CORS settings. Don’t forget to enable CORS for the relevant endpoints in API Gateway. This is a frequent error during API design and often means extra back-and-forth exchanges between the front-end team and the back-end team.

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