Serverless Archives - Page 5 of 5

Subscribe SNS to EventBridge Pipes

Posted on March 12, 2023by Benjamen Pyle

Legacy Serverless to New Serverless

I’ve been thinking and working hard on how I can start to introduce EventBridge and Pipes into some of my existing applications. Unfortunately, I have SNS in front of a lot of my service code and you can’t natively subscribe SNS to EventBridge Pipes. So I’ve started pondering this idea of how to integrate Legacy Serverless Applications into an ecosystem as new features are developed with more modern Serverless concepts. What I really want is a way to connect SNS to EventBridge Pipes.

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BatchGetItem with Golang

Posted on February 25, 2023by Benjamen Pyle

I haven’t had to use the Batch API a great deal over the past few years. When thinking more on it, it’s not that I have anything against the API, it is just that I never had a reason to work with it. However, over the past couple of months I saw that I’d used it twice in a project and with good success. My Golang and DynamoDB content has been doing well so I figured there might be some appetite for this one. And with all that said, I wrote this article highlighting how to use DynamoDB’s BatchGetItem with Golang.

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Streaming DynamoDB to EventBridge Pipes

Posted on February 12, 2023by Benjamen Pyle

There is a real push and thought process around moving as much of your boilerplate code up into your serverless cloud components as possible. By streaming DynamoDB to EventBridge Pipes, you can move a large chunk of that boilerplate into the cloud. The thinking is that for things that really don’t differentiate your solution, why not let your cloud provider take care of that for you. Their integrations are well tested, highly scalable and highly available and can be more cost effective as you don’t waste CPU cycles on things like

Polling
Error handling
Data transformation
Filtering
Enrichment
Event management

All of those things “could” be done say in a container or in a Lambda but again, why pay the cycles, write all of this code over and over and over when you can push it up as configuration and as a part of your CDK or SAM code that handles the deployments

As usual, if you want to skip straight to a working sample, here’s the Github repository. Feel free to pull it and then run cdk deploy npx ts-node bin/app.ts and off you go.

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Extending and Customizing the JWT from Cognito via AWS Lambda using Go

Posted on February 4, 2023by Benjamen Pyle

I’ve been working a lot lately with Cognito and User Pools in AWS as I’ve been wanting to migrate and existing app into a serverless Identity and Access provider. The promise of Cognito is this “Implement secure, frictionless customer identity and access management that scales” – AWS

Honestly there are so many identity providers out there. This article won’t go into the alternatives and other options out there but will specifically touch upon something that I know was a big question for me when I started with Cognito which was, “how can I customize the private claims in a token?”. So let’s discuss that a little further

As usual, if you want to skip straight to code, feel free to jump over to the repository here

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Handling Change with AWS Healthlake

Posted on January 30, 2023by Benjamen Pyle

One of the features that I am currently missing with AWS Healthlake is a proper “event-ing” framework. With DynamoDB you’ve got streams. With RDS you can use DMS. But with Healthlake there is no native change data capture mechanism.

Being that I’m only working on event driven architectures these days, I needed a way to be able to handle change. What I’m going to show you below is not “sanctioned” but it is 100% AWS native and continues with the Serverless theme. With that said, here’s the Github Repository if you just want to jump ahead. The CDK code will deploy a Healthlake instance @ $.27 / hr so please run cdk destroy npx ts-node bin/app.ts` when you are done

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Mapping AWS State Machine output to API Gateway response with VTL

Posted on January 27, 2023by Benjamen Pyle

This is a continuation of a previous article I wrote regarding zero code workflows creating Cognito users with Step Functions. Part of using State Machines with API Gateway is the dealing with the response and potentially VTL mapping

Goals of this article are to document some of the tips and things that I picked up along the way.

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Creating an AWS Cognito User with an Auto-Incrementing ID using AWS Step Functions

Posted on January 25, 2023by Benjamen Pyle

So there are a couple of interesting topics in here.

I’ve been really leaning into code-less workflows with AWS Step Functions and this State Machine has nothing but native SDK integrations which include
- DynamoDB (Put, Delete, Get)
- Cognito/User Pools (AdminCreateUser)
I’ve run into some legacy code that requires a Username to be a bigint and I don’t want to use an RDBMS so I’m using DynamoDB to generate one for me while also being “race condition” proof

As always, if you want to jump straight to the code, here is the Github repository

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API Gateway Base Path Mapping

Posted on January 16, 2023by Benjamen Pyle

AWS API Gateway is fantastic for sitting in front of AWS resources like load balancers and lambda functions and it’s also really great for setting nice domain boundaries around you application code. Let’s enhance the API Gateway experience a little more by levering Base Path Mapping

For instance, if you have boundary A with a set of REST operations and a boundary B with another set of REST operations you now end up with 2 API Gateways with their own FQDN to access those resources. But what if you want to have those separate, but also roll them up under a common domain name? This is where using API Gateway Custom Domains and Base Path mapping while turning off the default endpoints is so helpful. Article below is going to be pretty concise but also very specific to this problem and show how to use API Gateway Base Path Mapping with CDK

If you want to jump to the code, here is the Github repos

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Creating an Async Integration with AWS Step Functions from API Gateway via CDK

Posted on December 17, 2022by Benjamen Pyle

I often have the scenario where there is a client which makes a request to an endpoint and they just want to make sure that payload was delivered but not necessarily concerned about the outcome. A pretty simple Async operation that happens over a quick Sync channel.

In the past, I’ve done my best either with a Lambda function to make sure it was so simple that it was incapable of failure. As I progressed further into that solution, I started using AWS Integrations to drop the payload off in an SQS Queue and then having a Lambda read that queue and then decide what to do.