Testing serverless architectures doesn’t have to be hard, and it doesn’t have to be slow.
Let me share my approach with you, and show you how I achieve a fast feedback loop by writing remocal tests against ephemeral environments, and how you can turbocharge your workflow as well. Once you “get it”, serverless testing can be a joy :-)
AWS AppSync added support for Lambda authorizers on 30th July 2021 and it made it much easier to implement group-based authorization with 3rd party identity services. Group-based auth with AppSync and Cognito I previously wrote about how you can secure multi-tenant applications with AppSync and Cognito. Where you can use custom attributes to capture the tenant …
With API Gateway and Lambda, you can handle client errors gracefully by returning a 4xx response. module.exports.handler = async (event) => { // run validation logic return { statusCode: 400 } } This way, we can communicate clearly to the client that there’s a problem with its request. It also lets the Lambda invocation complete …
How to handle client errors gracefully with AppSync and Lambda Read More »
It’s been two years since I last wrote about Lambda layer and when you should use it. Most of the problem I discussed in that original post still stands: It makes it harder to test your functions locally. You will still need those dependencies to execute your function code locally as part of your tests. …
Lambda layer: not a package manager, but a deployment optimization Read More »
In the last post I discussed my preferred approach for modelling multi-tenant applications with AppSync and Cognito. This approach supports the common requirements in these applications, where there are a number of distinct roles within each tenant. This approach (and others like it) works great when the tenants are isolated. But what if they are …
Building a custom IAM system has made me appreciate AWS IAM even more Read More »
Thank you to Josh for asking this question on the AppSync Masterclass forum. His original question goes like this: Let’s say I want to add a one-to-many relationship from Profile to a new property called “Tag” (a complex object with “name” and “color” properties) so a user can define their own Tags. I would also like a …
How to model one-to-many relationships with AppSync and DynamoDB Read More »
One of the most common questions I get is “How do I build a multi-tenant application with AppSync and Cognito?”. If you google this topic on the internet you will no doubt come across many different opinions. It’s a topic that we’ll soon explore in the AppSync Masterclass but I want to take this opportunity …
How to secure multi-tenant applications with AppSync and Cognito Read More »
All the sessions during week 1 are available to watch on-demand now. You can access them via the official reinvent portal here. Here are my top picks for sessions to watch, in no particular order. “Building technology standards at Amazon scale” by Marc Brooker You can watch the session here, and here‘s my notes for the session. “Monitoring …
I’ve gotten a few questions about Aurora Serverless v2 preview, so here is what you need to know about Aurora Serverless v2 during preview. Q: Does it replace the existing Aurora Serverless offering? A: No, it lives side-by-side with the existing Aurora Serverless, which will still be available to you as “v1”. Q: …
What you need to know about Aurora Serverless v2, so far. Read More »
During this re:Invent, I’m sharing with you the biggest serverless-related announcements and what they mean for you in a series of hot-takes. Starting with, the biggest announcements from today’s keynote, plus a bunch of other important announcements just before r:Invent. 1. Lambda changes billing to per ms Lambda now bills you by the ms as …
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