cdk Archives - Page 4 of 4 - A Pyle of Stories

Serverless

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

Serverless

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

Infrastructure

Handling “Poison Pill” Messages with AWS Kinesis and Lambdas

Posted on December 29, 2022by Benjamen Pyle

Queues and streams are fundamentally different in how they handle readers consuming their information.

With an SQS Queue you can have many consumers but generally one consumer will win reading the message and in the event of success the message is purged from the queue or upon failure that message is returned back to the queue. It technically doesn’t get deleted, yet the its visibility property is changed. Hence why the VisibilityTimeout on the queue matters. If your code processes messages in more time than that property then you are going to get messages that constantly get put back on the queue for retry.

Serverless

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.

Observability

Observing Lambda with Datadog and Golang

Posted on December 12, 2022by Benjamen Pyle

Instrumenting code for observability upfront is one of the most important things that a developer can do for his/her “future” self. And instrumenting for observing AWS Lambda with Datadog and Golang is actually much simpler than you could imagine So what does that mean?

Infrastructure

AWS CDK Pipeline

Posted on November 28, 2022by Benjamen Pyle

Deploying code (assets) into AWS has never been easier than it is right now. A few months back our engineering team made the decision to go all in on AWS CDK and with that included the need/desire for full pipeline automation. We’d been using a smattering of Python/Node, CloudFormation and CodeCommit plus CodePipeline code for all of our services and honestly it works fine once it’s set but getting it set per service became a pain. And honestly making modifications for idiosyncrasies for some of the services just was plain awful. So off we went and during that exploration phase we found the opinionated little construct called AWS CDK Pipelines. Below our walk through what it all meant for us.

Infrastructure

Intro to CDK

Posted on November 19, 2022by Benjamen Pyle

AWS CDK (Cloud Developer Kit) is a new way to develop cloud infrastructure as it relates to AWS by brining your favorite programming language to apply abstractions on top of CloudFormation. This won’t be a super in-depth post on the tech and how to apply it (I’ll follow up with more articles later) but I’d like outline some of the benefits and reasons that you might consider your next feature’s infrastructure be coded up with it.