Roots

Roots allow the server to discover the filesystem roots that the client has exposed.

// Inside a handler:
if runtime.client_supports_root_list().unwrap_or(false) {
    let roots = runtime.request_root_list(None).await.map_err(|err| {
        RpcError::internal_error().with_message(err.to_string())
    })?;
    for root in roots.roots {
        println!("Root: {:?} at {}", root.name, root.uri);
    }
}

The client must declare the roots capability and provide the root list.