WASI faas

An experiment server running WebAssembly System Interface functions.

_{Built on top of Hyper and Wasmtime.}

Abstract

In the past few yeras, it became quite common to hear buzz words such as WASM and WASI, function-as-a-service, and relatives.

With the advent of Deno, their Deploy service, the run to edge-function by Netlify, Superbase, and Vercel, aside of the well enstablished Cloudfront Workers, I wanted to join the trend with a small experiment.

After the intersting reading about the imminent Wasimtime 1.0 release, I decided to try building a very basic function-as-a-service platform to run WebAssembly System Interface executables in the cloud.

Similarly as for fast-cli and flagger, this project is also an opportunity to improve my Rust, in this case, diving deeper in the subject of proc_macro.

The project is developed with Zed.

Run the example

Ensure to have wasm32-wasi target.

rustup target add wasm32-wasi

Build the example with the above target.

cargo build --bin wasi-faas-example --target wasm32-wasi --release

And then run the server.

cargo run --release --bin wasi-faas -- --module-path ./target/wasm32-wasi/release/wasi-faas-example.wasm

By default, the server will listen publicly on port 8888. Any combination of HTTP methods and endpoints will run the target module.

curl --location --request POST 'http://localhost:8888/test-endpoint' \
  --header 'Content-Type: text/plain' \
  --data-raw 'Asd'

License

WASI faas is distributed under the terms of the MIT license.

See LICENSE for details.