Update 21/06/2020: following lots of feedback and questions on Twitter, I have updated the post to include a few more options. Quite a few clients have asked me “Hey Yan, what API Gateway auth method should I use for this REST API?” so I thought I’d share my answer with everyone here. This is the …
Hi, welcome to another weekly update. First of all, I want to thank Dynobase for sponsoring this week’s update. Dynobase – Professional GUI Client for DynamoDB Dynobase accelerates your DynamoDB workflow with easier data exploration, code generation, bookmarks, tabs, history, import/export capabilities and much more. Dynobase is available for Mac, Windows and Linux. Download Free 7-Day Trial. …
I had been working on a client project where I built the GraphQL backend for a new social network using primarily AppSync, Lambda and DynamoDB. One of the features of the app was to support private messaging between two users. To allow either user to fetch their chat messages in chronological descending order, I modelled …
AppSync: how to compare strings lexicographically in VTL Read More »
Hi, welcome to another weekly update. Production-Ready Serverless workshop goes virtual! Starting from May 4th, I will be running a 4-week instructor-led workshop that teaches you everything you need to know to build a production-ready serverless application. It’s based on the same demo app as my Manning course, but all the code has been completely …
TL;DR To make an AppSync DynamoDB resolver throw exceptions on conditional check errors, we need to check $context.error in the response mapping template ourselves. Like this: #if ( $ctx.error ) #if ( $ctx.error.type.equals(“DynamoDB:ConditionalCheckFailedException”) ) $util.error(“your error message”) #else $util.error($ctx.error.message, $ctx.error.type) #end #end $utils.toJson($context.result) And now, the longer version. The problem AppSync lets us perform DynamoDB …
AppSync: how to error on DynamoDB conditional check failures Read More »
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 »
Whilst working on a client project, I ran into an interesting problem with AppSync which I couldn’t find an answer after a lot of googling. I hope this article can save you the same pain should you run into the same problem. The problem is that when you have a nullable nested field that you …
AppSync: skipping nullable nested resolvers by returning early Read More »
Hi, welcome to another weekly update. I teamed up with Furnace First, some personal news. I have joined the advisory board for furnace.io and am working closely with Danny Waite and John Blamire. We’re building a platform for data-intensive applications that can operate at a fraction of the cost of other platforms such as Zapier …
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 »
By continuing to use the site, you agree to the use of cookies. more information
The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.