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Introducing Fermyon's Spin

source | github | discord | twitter

WebAssembly Framework

  • think of WebAssembly as a compile target; a standardized bytecode formart to execute programs

  • AssemblyScript, Grain like languages have been designed specifically for compilation to WASM; using binaryen

  • JS-in-WASM allows sandboxing one Javascript program from another

  • WASI (WebAssembly System Interface) is WIP to provide features like filesystem, db, network connection while upholding reliability

  • WAMR is a micro lightweight standalone runtime for WebAssembly; Wasmtime as well

  • Spin is a framework for web apps, microservices & other server like applications. Rust & Go both have robust Spin support, can also use Python/Ruby/AssemblyScript/Grain/C/C++ and others.

  • Fermyon already runs Spin in Production using a WebAssembly based Bartholomew CMS, built as a Wagi app i.e. WebAssembly Gateway Interface

  • Hippo is an easy way to deploy & serve WebAssembly; for similar purpose there is a Kubernetes' Rust Kubelete Krustlet

Spin as a Foundation

  • Spin provides a framework to easily expose WASM features while creating FaaS style design

  • After Wagi, WASM has many updates to pave path for Spin. WASI & WIT (WASM Interface, an experimental textual format defining interfaces) make Spin easy to manage goals like Security

  • Samples in Rust & Go for a simple logic of HTTP 200 Spin It! using common HTTP Request/Response model

#[http_component]
fn hello_world(_req: Request) -> Result<Response> {
    Ok(Response::builder()
        .status(200)
        .body(Some("Spin It!".into()))?)
}
func main() {
 spin.HandleRequest(func(w http.ResponseWriter, r *http.Request) {
  fmt.Fprintln(w, "Spin It!")
 })
}

low-level duties like setting up SSL, handling iterrupts or managing network connection gets delegate to Spin; you just spin up to run

  • Currently (May/2022) it only supports top-level HTTP request/response for few languages. But it ships with 100% Wagi implementation, so almost all WASI supporting languages could be used.

  • spin_sdk provides support for more components like Redis; more are in process of release

  • Spin support for Bindle packaging, WebAssembly Component Model and WIT.

Spin FileServer shows a production-ready spin app