Rust/Wasm on AWS Lambda@Edge (CloudFront)

Read the accompanying blog post to this project.

Since we still cannot have native Rust (or WebAssembly for that matter) on AWS Lambda@Edge, we have to come up with our own solution. Here I present mine: using the AWS Lambda Node.js enviroment to execute our Wasm blob generated from Rust code.

tl;dr

make build
make call
make zip
# upload to your AWS Lambda and attach it to a CloudFront distribution (as viewer request trigger)
# check the Cloudwatch logs in the regions you made requests
# be happy - Have a nice day!

This demo doesn't do anything fancy. In fact, it does not alter the request at all and only passes it through as-is.

The function will make a few log statements, check the Cloudwatch logs in the regions you received requests for your CloudFront distribution.

This setup is good to test for the baseline performance.

After the cold-start some requests later the function duration should be around 1 to 2 ms.

Depending on the region and where you are, this translates to 40 to 50 ms in request latency for a small static asset, while without any trigger attached the same request would take around 25 ms.

License

^{Licensed under either of Apache License, Version 2.0 or MIT license at your option.}
_{Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this crate by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.}