re:Invent is almost upon us. Judging by the things that had been announced ahead of re:Invent, one can’t help but be excited about the main event itself! Here is a list of the serverless-related announcements so far that you should know about. Payload-based message filtering for Amazon SNS Here’s the official announcement. This is arguably the …
The biggest preinvent serverless announcements you may have missed Read More »
How Lambda pricing works When it comes to cost, Lambda charges you based on the amount of memory you allocate to the function and how long this function runs for by the millisecond. And it also charges you a fixed fee of 20 cents per million invocations. source: https://aws.amazon.com/lambda/pricing There can be other costs involved, …
An interesting question came up on the AppSync Masterclass forum, and it highlights a common way you can get into CloudFormation circular dependencies. In the CloudFormation stack, there is an AppSync API, which uses a Cognito User Pool for authentication and authorization. When a user signs up, the app should fire an update on a …
How to work around CloudFormation circular dependencies Read More »
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 …
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