A Rust library providing a safe API around native abstractions for Node.A Rust library providing a safe API around native abstractions for Node.
Nanny collaborates with the V8 embedding API to safely monitor stack-allocated handles to garbage-collected objects. This ensures that all objects rooted in the stack are safely tracked by the garbage collector.
A good nanny keeps the nursery safe.
A complete example can be found in the nanny-demo repository. The demo makes use of the rust-bindings npm package to completely automate the process of building and requiring a Rust module in Node.
A JS function is represented in Rust as a function that takes a Call object and produces either a JS value or the Throw constant, indicating that an exception has been thrown. The Call object provides access to a memory management scope, which safely manages the rooting of handles to garbage-collected JS values:
rust
fn make_an_array(call: Call) -> JS<Array> {
let scope = call.scope; // the current scope for rooting handles
let mut array: Handle<Array> = Array::new(scope, 3);
array.set(0, Integer::new(scope, 9000));
array.set(1, Object::new(scope));
array.set(2, Number::new(scope, 3.14159));
Ok(array)
}
MIT