This repo is a demonstration of how you could build your own "serverless" platform with data persistence in only 200~ lines of simple, safe code.

It combines deno (rust v8 runtime), axum (http library), and rusqlite (sqlite) to build a Function as a Service (FaaS)-like application with file-system backed storage.

A user submits javascript code with a HTTP POST request, then is able to invoke their function via GET requests.

The js environment the code is executed within has access to 3 operations implemented in rust. console.log emits messages via stdout on the server, set inserts into a sqlite backed key-value store, and get retrieves from the same store.

The last evaluated expression from an invoked js function will be returned in the HTTP GET response body.

In your first terminal

cargo run

In your second terminal

# Submit the contents of fn.js as the function "raccoon"
curl -d @fn.js localhost:8080/fn/raccoon

# Invoke the function by it's name
curl localhost:8080/fn/raccoon

# And a couple more times... just in case
curl localhost:8080/fn/raccoon
curl localhost:8080/fn/raccoon
curl localhost:8080/fn/raccoon