middy
aws-embedded-metrics-node
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middy | aws-embedded-metrics-node | |
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22 | 7 | |
3,613 | 240 | |
0.6% | 2.1% | |
9.4 | 5.0 | |
3 days ago | 5 months ago | |
JavaScript | TypeScript | |
MIT License | Apache License 2.0 |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
middy
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Testing Serverless Applications on AWS
Adding the is-test flag to our object metadata gave us our way of passing some kind of test context into our workload. The next step was to make the Lambda Function capable of discovering the context and then using that to control how it behaves under test. For this we used Middy.
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Learn serverless on AWS step-by-step: Strong Types!
I also decided to use the middy library to add CORS management to our lambda function. This will allow us to call our lambda function from our frontend, without having to worry about CORS.
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Implementing Magic Links with Amazon Cognito: A Step-by-Step Guide
This function uses the Middy middleware engine to handle unhandled errors and add CORS headers in the response.
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Ask HN: What would be your stack if you are building an MVP today?
I mean I'm literally building an AWS lambda function that outputs HTML when it's called via API Gateway. So someone hits https://mydomain.com/mycoolpage, then the MyCoolPage AWS Lambda function is executed and outputs whatever.
If you're interested, I use https://middy.js.org/ as a middleware engine for my AWS lambda functions which I find helpful.
I use the open sourced serverless framework for doing deploys https://www.serverless.com/
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tRPC: Build Full-Stack TypeScript Applications With Type Safety
middy for lambda-side middleware
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How to Securely Use Secrets in AWS Lambda?
That is it from the CDK side. Now let us create the handler and retrieve that secret. I like to use middy which describes itself as "stylish Node.js middleware engine for AWS Lambda". It offers some helpful middlewares like ssm which will help us retrieve and cache values from SSM Parameter Store. (Middy provides various other official middlewares including one for Secrets Manager.) I prefer a middleware for this because it keeps the code for retrieving the secret out of your handler which should deal with actual business logic.
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Lambda Powertools TypeScript is Generally Available
So what's changed in the beta? A glance at the CHANGELOG suggests the answer is that not very much has changed in six months. Lambda Powertools TypeScript still supports class decorators, middy, and a manual API. It still covers the core capabilities of logging, metrics and tracing, and no new capabilities have been added. Outside of some bug fixes and optimization, this is still very much the library I previewed back in January.
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Your CORS and API Gateway survival guide
If you use Javascript, check out the Middy middleware engine for use with Lambda. It has a lot of nice middlewares that handle the boring boilerplate of your Lambda functions. One is the cors middleware, which automatically adds CORS headers to your functions.
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First Look at Lambda Powertools TypeScript
I'm a big fan of TypeScript and in fact co-authored a book about it. I don't find myself using Java or Python much, so while I've been interested in Lambda Powertools, I never tried it out until now. Lambda Powertools TypeScript joins middy and DAZN Lambda Powertools in the Lambda tooling space for the Node.js runtime. Two things that differentiate Lambda Powertools TypeScript from comparable libraries are it is sponsored by AWS and it supports decorators.
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Test Drive AWS Lambda Powertools for Typescript
The next natural step was to look at middleware such as Middy to decorate the main business logic, and allow these tasks to be defined once and used consistently. I remember listening to a Comic Relief talk about their Lambda wrapper back in 2019. Since then, I was introduced by Yan Cui to DAZN Lambda Powertools, which was the inspiration for this new project.
aws-embedded-metrics-node
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💔 Goodbye Cold Starts ❤️Hello Proactive Initialization
Lamby will now publish CloudWatch Embedded Metrics in the Lamby namespace with a custom dimension for each application's name. Captured metrics include counts for Cold Starts vs. Proactive Initializations. Here is an example running sum of 3 days of data for a large Rails application in the us-east-1 region.
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Lambda Powertools TypeScript is Generally Available
Often when it comes to metrics, we think about CPU, latency and other operational metrics and AWS services usually provide those out of the box. This kind of thinking can be flawed when we end up having to use 3rd parties such as google analytics to infer critical business events. A simpler solution is to have the application emit a metric when a business event (say a customer signup) occurs. We have a few options for doing this: We can use aws-sdk, we can use the aws-embedded-metrics lib and now we can use Powertools Metrics. Which is the best? Let's see.
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Observability Best Practices when running FastAPI in a Lambda
Let's explore the next core utility in Lambda Powertools, the Metrics utility. This utility lets you easily push metrics to CloudWatch by taking care of all the necessary boilerplate. It works asynchronously by using Amazon CloudWatch Embedded Metrics Format, by logging the metrics to stdout. It also aggregates all metrics from each invocation to save on the number of calls to CloudWatch.
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How to report CloudWatch metrics without AWS SDK
To make it easier to create such an object, AWS has provided libraries for Node.js, Python, Java, and .NET. The above example using the AWS SDK can now be written as follows:
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First Look at Lambda Powertools TypeScript
Custom metrics have a pricing structure which can be expensive. Embedded Metrics Format can help manage the cost and is supported by Lambda Powertools TypeScript. Again, the docs here are pretty good, so no need for me to break it down. Instead let's look at the experience. I've added a custom metric of "collectionSuccess" to my collectionSuccess function. In my hypothetical app, some payments wind up in collections and here I'm marking whether or not the collection resulted in a payment.
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How To Debug AWS Lambda: A Detailed Overview
You can use metrics to aid debugging by adding them to your dashboards that we talked about earlier. It’s also possible to add custom metrics, and there are many libraries and tools (e.g. node, python, etc) which can help you do this.
What are some alternatives?
aws-cdk - The AWS Cloud Development Kit is a framework for defining cloud infrastructure in code
dynamodb-toolbox - A simple set of tools for working with Amazon DynamoDB and the DocumentClient
aws-sdk-js-v3 - Modularized AWS SDK for JavaScript.
typescript-badges - :smirk_cat: TypeScript Badges
powertools-lambda-typescript - Powertools is a developer toolkit to implement Serverless best practices and increase developer velocity.
projen - Rapidly build modern applications with advanced configuration management
serverless-graphql - Serverless GraphQL Examples for AWS AppSync and Apollo
dazn-lambda-powertools - Powertools (logger, HTTP client, AWS clients, middlewares, patterns) for Lambda functions.
json-schema-to-ts - Infer TS types from JSON schemas 📝
DefinitelyTyped - The repository for high quality TypeScript type definitions.
aws-sdk-js - AWS SDK for JavaScript in the browser and Node.js
jsii - jsii allows code in any language to naturally interact with JavaScript classes. It is the technology that enables the AWS Cloud Development Kit to deliver polyglot libraries from a single codebase!