How to set up custom domain names for AppSync

I previously wrote about five reasons you should consider AppSync over API Gateway. One thing that API Gateway supports but you can’t do with AppSync out-of-the-box yet is custom domain names. Your shiny new AppSync API is available at XYZ.appsync-api.us-east-1.amazonaws.com/graphql, but you really want people to use your own domain instead because dev.example.com/graphql is much …

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How to model hierarchical access with AppSync

I have been working with a US client to build a first-of-its-kind app for managing medical consents. It falls under HIPAA compliance and it’s paramount that we do not allow unauthorized access to user data. As part of the app, we have built an admin tool that will be used by admin staff from the …

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Weekly update 47

Hi, welcome to another weekly update! Real-World Serverless podcast Since the last update, we have 4 new episodes for you: #21: From K8 to Serverless at Wealth Wizards #22: Real-World Serverless with Gojko Adzic #23: Serverless at Alma Media with Ari Palo #24: Serverless at Stedi with Zack Kanter New blog posts Choreography vs Orchestration …

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Choreography vs Orchestration in the land of serverless

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 …

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How I scaled an AppSync project to 200+ resolvers

I have been working on a large AppSync project for a client these past few months. The initial version of the app was built in just a few weeks, but the client has commissioned additional features and the project has kept growing. At the time of writing, this project has over 200 AppSync resolvers and …

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AppSync: how to inject table names into DynamoDB batch & transact operations

When working with CloudFormation, AWS recommends not to give explicit names to resources and let CloudFormation name them for you. This has several advantages: It’s harder for attackers to guess resource names such as S3 buckets or DynamoDB tables. You can deploy the same stack multiple times to the same account. This is useful when …

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Weekly update 46

Hi, welcome to another weekly update, it’s been a busy few weeks for me so lots of things to catch you up on! Production-Ready Serverless workshop is back! My 4-week Production-Ready Serverless workshop is coming back in September. With an improved and more comprehensive curriculum based on student feedback from the last run in May, when over …

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Are Lambda-to-Lambda calls really so bad?

If you utter the words “I call a Lambda function from another Lambda function” you might receive a bunch of raised eyebrows. It’s generally frowned up for some good reasons, but as with most things, there are nuances to this discussion. In most cases, a Lambda function is an implementation detail and shouldn’t be exposed …

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