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.
serverless_demo.mov
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