Author here. The novel piece is the Pages compiler (Manouche — named after the Django Reinhardt jazz genre): page!, head!, and form! macros go through TokenStream → AST → validation → IR → codegen and emit both client WASM and server SSR code from the same source. A #[server_fn] is callable from client components but compiles to a server-only function with full DI access:
use reinhardt::DatabaseConnection;
use reinhardt::db::orm::Model;
use reinhardt::pages::server_fn::{ServerFnError, server_fn};
#[server_fn]
async fn list_active_users(#[inject] db: DatabaseConnection) -> Result<Vec<User>, ServerFnError> {
User::objects()
.filter_by(User::field_is_active().eq(true))
.all_with_db(&db)
.await
.map_err(|e| ServerFnError::application(format!("DB error: {e}")))
}
The same file holds the client component that calls it — list_active_users is invoked as an ordinary async Rust function; on WASM the macro rewrites it into a typed RPC call:
use reinhardt::pages::component::Page;
use reinhardt::pages::page;
use reinhardt::pages::reactive::hooks::{Action, use_action};
pub fn active_users_view() -> Page {
// use_action works uniformly on native (SSR) and WASM; on native the future
// is dropped after a synchronous Idle→Pending→Idle cycle, so SSR renders the
// empty shell that WASM later hydrates and populates.
let load =
use_action(|_: ()| async move { list_active_users().await.map_err(|e| e.to_string()) });
load.dispatch(());
page!(|load: Action<Vec<User>, String>| {
div {
watch {
if load.is_pending() {
p { "Loading..." }
} else if let Some(err) = load.error() {
p { { err } }
} else {
ul {
{ Page::Fragment(
load.result().unwrap_or_default().iter()
.map(|u| page!(|name: String| li { { name } })(u.username.clone()))
.collect::<Vec<_>>()
) }
}
}
}
}
})(load)
}
No OpenAPI schema, no hand-rolled fetch, no duplicated request/response types between client and server. The #[server_fn] macro generates the RPC endpoint + JSON codec on the server, a typed async stub on the client, and hydration markers so SSR-rendered HTML stays consistent after WASM takes over.
Website: https://reinhardt-web.dev
docs.rs: https://docs.rs/crate/reinhardt-web/latest
