This is a simple serverless application built in Rust. It consists of an API Gateway backed by four Lambda functions and a DynamoDB table for storage.

This single crate will create five different binaries, one for each Lambda function. It uses an hexagonal architecture pattern to decouple the entry points, from the main domain logic, the storage component, and the event bus component.

• Rust 1.56.0 or higher
• cargo-lambda
• Zig for cross-compilation (cargo-lambda will prompt you to install it if it's missing in your host system)
• The AWS SAM CLI 1.33.0 or higher for deploying to the cloud
• Artillery for load-testing the application

You can use the following commands at the root of this repository to test, build, and deploy this project:

# Optional: check if tools are installed
make setup
# Run unit tests
make tests-unit
# Compile and prepare Lambda functions
make build
# Deploy the functions on AWS
make deploy
# Run integration tests against the API in the cloud
make tests-integ

Artillery is used to make 300 requests / second for 10 minutes to our API endpoints. You can run this with the following command:

make tests-load

Using this CloudWatch Logs Insights query you can analyse the latency of the requests made to the Lambda functions.

The query separates cold starts from other requests and then gives you p50, p90 and p99 percentiles.

filter @type="REPORT"
| fields greatest(@initDuration, 0) + @duration as duration, ispresent(@initDuration) as coldStart
| stats count(*) as count, pct(duration, 50) as p50, pct(duration, 90) as p90, pct(duration, 99) as p99, max(duration) as max by coldStart

If you want to get started with Rust on Lambda, you can use these cookiecutter templates to setup your project.

You can find implementations of this project in other languages here:

• 🐿️ Go
• ⭐ Groovy
• ☕ Java with GraalVM
• 🤖 Kotlin
• 🏗️ TypeScript
• 🥅 .NET

See CONTRIBUTING for more information.

This library is licensed under the MIT-0 License. See the LICENSE file.