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 :-)
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 »
AppSync has built-in logging integration with CloudWatch Logs (see here for more details on the logging options). You can set the Field resolver log level to NONE, ERROR or ALL. When the field resolver log level is set to NONE or ERROR, you don’t get a lot of value from the AppSync logs. For example, …
Choreography and Orchestration are two modes of interaction in a microservices architecture. In orchestration, there is a controller (the ‘orchestrator’) that controls the interaction between services. It dictates the control flow of the business logic and is responsible for making sure that everything happens on cue. This follows the request-response paradigm. In choreography, every service …
Choreography vs Orchestration in the land of serverless Read More »
TL;DR – Lambda-to-Lambda calls are generally a bad idea except for some select use cases, such as: You’re running the Apollo server in a Lambda function. To offload secondary responsibilities to another function by invoking asynchronous (that is, using Event as InvocationType). Avoid synchronous lambda-to-lambda calls If you utter the words “I call a Lambda …
Have you been wondering about serverless but just don’t know how and where to start? Maybe you’re already building stuff with serverless, but don’t know if you’re doing it right? Are you unsure about the best practices for testing, monitoring and how to choose between similar services like SNS and EventBridge? I have just …
Skill up your serverless game with my new instructor-led online workshop Read More »
AWS Lambda has a 6MB limit that applies both to request and response payloads. This can be problematic if you have an HTTP API that allows users to upload images and files to S3. One day, a customer might complain that he couldn’t upload pictures of his cat to your app. In your Lambda logs, …
Hit the 6MB Lambda payload limit? Here’s what you can do. Read More »
Lambda invocations are charged in 100ms blocks of execution time. But the cost per 100ms of execution time depends on how much memory you allocate to the function. The higher the memory, the more CPU cycles and network bandwidth, but the higher the cost as well. One of the simplest and most efficient cost optimization …
How to: optimize Lambda memory size during CI/CD pipeline Read More »
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