utils: Create and use web_server! macro

acrate_utils/Cargo.toml

@@ -15,6 +15,8 @@ axum-extra = { version = "0.9.4", features = ["query"] }
 log = { version = "0.4.22", features = ["std", "max_level_trace", "release_max_level_debug"] }
 pretty_env_logger = "0.5.0"
 mediatype = { version = "0.19.18", features = ["serde"] }
+minijinja = "2.5.0"
+tokio = { version = "1.41.1", features = ["net"] }
 
 [lints.clippy]
 tabs-in-doc-comments = "allow"

acrate_utils/src/ext.rs

@@ -0,0 +1,6 @@
+use std::sync::Arc;
+use axum::Extension;
+
+pub use minijinja;
+
+pub type ExtMj = Extension<Arc<minijinja::Environment<'static>>>;

acrate_utils/src/init.rs

@@ -0,0 +1,49 @@
+use std::net::SocketAddr;
+use std::sync::Arc;
+use axum::Extension;
+
+/// Initialize logging with [`pretty_env_logger::init`].
+pub fn init_logging() {
+	log::trace!("Initializing logging...");
+	pretty_env_logger::init();
+	log::trace!("Initialized logging!");
+}
+
+/// Initialize a [`tokio::net::TcpListener`] bound to the given [`SocketAddr`].
+///
+/// # Panics
+///
+/// If unable to bind to the given [`SocketAddr`].
+///
+pub async fn init_listener(bind: SocketAddr) -> tokio::net::TcpListener {
+	log::trace!("Creating Tokio listener bound to: {bind:#?}");
+	let listener = tokio::net::TcpListener::bind(bind)
+		.await
+		.unwrap_or_else(|_| panic!("Failed to bind to: {bind:#?}"));
+	log::trace!("Created Tokio listener: {listener:#?}");
+	
+	listener
+}
+
+/// Initialize a static [`minijinja::Environment`].
+pub fn init_minijinja() -> minijinja::Environment<'static> {
+	log::trace!("Creating Minijinja environment...");
+	let mj = minijinja::Environment::<'static>::new();
+	log::trace!("Created Minijinja environment: {mj:#?}");
+	
+	mj
+}
+
+/// Initialize an [`axum::Router`] with the given [`minijinja::Environment`] available.
+pub fn init_router(mj: minijinja::Environment<'static>) -> axum::Router {
+	log::trace!("Creating Arc for the minijinja Environment...");
+	let mj = Arc::new(mj);
+	log::trace!("Created Arc for the minijinja Environment: {mj:#?}");
+	
+	log::trace!("Creating Axum router...");
+	let router = axum::Router::new()
+		.layer(Extension(mj));
+	log::trace!("Created Axum router: {router:#?}");
+	
+	router
+}

acrate_utils/src/lib.rs

@@ -1,14 +1,50 @@
-pub fn add(left: u64, right: u64) -> u64 {
-    left + right
+pub mod ext;
+pub mod init;
+pub mod run;
+
+
+/// Add the template file at the given path to the given [`minijinja::Environment`].
+#[macro_export]
+macro_rules! add_minijinja_template {
+    ($mj:ident, $path:literal) => {
+		log::trace!("Adding template to minijinja Environment: {:?} ← {:#?}", $mj, $path);
+		$mj.add_template($path, include_str!($path))
+			.expect(concat!("Invalid Minijinja template: ", $path));
+		log::trace!("Added template to minijinja Environment: {:?} ← {:#?}", $mj, $path);
+	};
 }
 
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn it_works() {
-        let result = add(2, 2);
-        assert_eq!(result, 4);
-    }
+/// Add the given route to the [`axum::Router`].
+#[macro_export]
+macro_rules! add_axum_route {
+    ($router:ident, $path:literal, $route:expr) => {
+		log::trace!("Adding route to axum Router: {:?} ← {:#?}", $router, $path);
+		let $router = $router.route($path, $route);
+		log::trace!("Added route to axum Router: {:?} ← {:#?}", $router, $path);
+	};
+}
+
+#[macro_export]
+macro_rules! web_server {
+    (
+		on: $socket_addr:expr,
+		templates: [
+			$( $template_path:literal ),+
+		],
+		routes: {
+			$( $path:literal => $route:expr ),+
+		}
+	) => {
+		$crate::init::init_logging();
+		let listener = $crate::init::init_listener($socket_addr).await;
+		let mut mj = $crate::init::init_minijinja();
+		$(
+			$crate::add_minijinja_template!(mj, $template_path);
+		)+
+		let router = $crate::init::init_router(mj);
+		$(
+			$crate::add_axum_route!(router, $path, $route);
+		)+
+		$crate::run::run_server(listener, router).await
+	};
 }

acrate_utils/src/run.rs

@@ -0,0 +1,25 @@
+/// Run a web server with [`axum::serve`], using the given [`tokio::net::TcpListener`] and [`axum::Router`].
+///
+/// # Exits
+///
+/// Once the server is terminated, the process will exit with either:
+///
+/// - `0`, if [`axum::serve`] returned [`Ok`];
+/// - `1`, if [`axum::serve`] returned [`Err`].
+///
+pub async fn run_server(listener: tokio::net::TcpListener, application: axum::Router) -> std::convert::Infallible {
+	log::trace!("Serving application: {listener:#?} → {application:#?}");
+	let result = axum::serve(listener, application)
+		.await;
+	
+	match result {
+		Ok(()) => {
+			log::error!("Server exited gracefully.");
+			std::process::exit(0);
+		}
+		Err(e) => {
+			log::error!("Server exited with an error: {e:#?}");
+			std::process::exit(1);
+		}
+	}
+}