Serverless Rust: Your Low-Risk Entry Point to Rust in Production (and the benefits are huge)

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jameseastham.co.uk loige.co Serverless Rust: Your Low-Risk Entry Point to Rust in Production James Eastham (he/him) Talking Serverless Datadog Luciano Mammino (he/him) Senior Architect Four Theorem

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ÒYou CAN have it all. You just canÕt have it all at once. Oprah Winfrey

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James Eastham Serverless Advocate

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Plant Based Pizza

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ÒSomething, something, trade- offsÉÓ

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ÒIt DependsÉÓ

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Make it safe

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Application Infrastructure

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Infrastructure

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Serverless What does it even mean?

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ÒServerless is a spectrum, not a binary decision. James Eastham

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Operational Overhead Less More Infrastructure Flexibility

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Technology Cost Human Cost

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AWS Lambda Azure Functions GCP Cloud Run AWS Fargate ECS Azure Container Apps EKS AKS GKE EC2 Azure VM Compute Engine Cloudflare Workers

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ÒIf you think Ôserverless firstÕ you aim to reduce your operational overhead as much as possible James Eastham

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AWS Lambda AWS Fargate ECS EKS EC2

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AWS Lambda AWS Fargate ECS EKS EC2

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AWS Lambda AWS Fargate ECS EKS EC2

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AWS Lambda AWS Fargate ECS EKS EC2

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AWS Fargate ECS

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Blog

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What about sustainability?

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AWS Lambda

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Your Application

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Your Application

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How Lambda Works?

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Create Execution Environment Download Code Initialise Runtime & Code Handle Request Initialisation Invoke

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1 2 3

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Caller Sync Invoke

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Lambda poller Internal Queue Caller Async Invoke

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Lambda poller Poll Invoke

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Requests per month

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ÒOk James. I’m convinced! How do I get started? All of you In the audience

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Luciano Mammino Senior Cloud Architect

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How does a Lambda function execute Rust code?

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The magic of Custom Runtimes!

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The magic of Custom Runtimes!

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The magic of Custom Runtimes! Runtime Handler (logic) Runtime API Poll for events Event (JSON) Execute (event) Response or Error Response or Error (JSON)

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Load the handler code

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Infinite loop

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LetÕs now write this in Rust!

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Just kiddingÉ AWS has already done that! 😜

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📝 Our first Lambda function in Rust - Create a new project - Install the lambda runtime - Write init code - Write handler code - deserialise event - add the biz logic - serialise response - Build it (Amazon Linux x86/arm64) - Zip it - Ship it

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A (much) better way: Cargo Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Local testing

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Local testing Full list of example events: loige.link/rust-lambda-events

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Local testing

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Local testing

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Building and shipping 🚢

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Building and shipping 🚢

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Building and shipping 🚢

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Building and shipping 🚢

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Building and shipping 🚢

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Building and shipping 🚢

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HTTP É Great! But what about consuming from Kafka?

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You know the drillÉ

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You know the drillÉ

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You know the drillÉ

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You know the drillÉ

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Our first HTTP Lambda

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Cargo Lambda supports tons of AWS events

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Éand you can have your custom ones too!

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Éand you can have your custom ones too!

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Éand you can have your custom ones too!

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Cargo Lambda is cool! But I want to use Terraform CDK SAM Something else!

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And you should! 😉 Cargo Lambda is fantastic for: - Scaffolding - Local Testing - Compiling (and cross-compiling!) But for deploying your Lambda Functions (with the rest of your infrastructure) You MUST use a proper IaC tool! Check out the Docs to learn how: loige.link/cargo-lambda-iac

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A case study! A Lambda Authorizer in Rust! Authenticated Request Your backend Custom Authorizer Lambda API Gateway

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A case study! A Lambda Authorizer in Rust! - The original version was written in Python - Since it was one of the most invoked functions we rewrote it in Rust - The change lead to: - 30% less cold starts - 90% decrease Init time - 60% decrease Execution time - 70% less memory - 50% cost reduction

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A case study! A Lambda Authorizer in Rust! - This project is now open-source: github.com/lmammino/oidc-authorizer - And the benchmarks are available too!

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Summary - Rust and Serverless is a perfect combo! - It gives you - Great performance - Safety - Cost reduction - Environmentally friendly applications - Serverless applications are small: Minimum risk / investment - If you are on AWS: use Cargo Lambda - Now go build your next Serverless app, with Rust!

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jameseastham.co.uk loige.co We are writing a book! rust-lambda.com