This is an ultra-slim, minimalistic custom runtime for AWS Lambda, with API bindings for C and Rust.

Features

• No abstraction bloat: HTTP Headers and JSON payload delivered in a raw char* buffer
• No dependencies outside of standard C library. Opt-in to whatever you actually need.
• Dynamically linked to glibc on target al2023 image, to minimize binary size
• No allocator dependency: Bring your own arena or gc allocator, or use malloc if you want
• (Optional) Rust language binding with no_std, no_main and no#tokio
• Rust binary is the same size as C binary (probably because of ELF page-boundary padding).

Benefits

• Extremely small deployment package size (~5kb zipped)!
• Extremely fast cold starts (4 to 5 milliseconds)
• Minimizes waste of compute resources, slowing down Global Warming!

Alternatives

• This is an alternative to https://github.com/PauloMigAlmeida/aws-lambda-c-runtime for C
• It's also an alternative to https://github.com/awslabs/aws-lambda-rust-runtime for Rust
• If you are not sure which project to use, you should probably choose one of the others.
• If you like Javascript, have a look at https://github.com/awslabs/llrt

Project Structure

• src/: The C source code which includes the runtime and an example function
• tests/: Unit-integration test using a mock server in Python to emulate the AWS Lambda Environment locally.
• sam-deploy/: Scripts for building & deploying using AWS SAM CLI in Docker. This is optional, you could alternatively use CDK, Terraform, the plain AWS CLI, etc.
• rust-binding/ & rust-example/: experimental Rust integration

Getting Started

Pre-requisites

git clone 
aws configure

C

python sam-deploy/deploy.py

Rust

python rust-example/build-test-deploy.py