perf: cache CSS bundle and theme list in LazyLock at startup

Algorithm5838 · Algorithm5838 · commit 7e9803f28185 · 2026-04-26T23:22:17.000+03:00
diff --git a/src/main.rs b/src/main.rs
@@ -89,19 +89,23 @@ async fn resource(body: &str, content_type: &str, cache: bool) -> Result<Respons
 	Ok(res)
 }
 
-async fn style() -> Result<Response<Body>, String> {
+static STYLE_CSS: LazyLock<String> = LazyLock::new(|| {
 	let mut res = include_str!("../static/style.css").to_string();
 	for file in ThemeAssets::iter() {
 		res.push('\n');
 		let theme = ThemeAssets::get(file.as_ref()).unwrap();
 		res.push_str(std::str::from_utf8(theme.data.as_ref()).unwrap());
 	}
+	res
+});
+
+async fn style() -> Result<Response<Body>, String> {
 	Ok(
 		Response::builder()
 			.status(200)
 			.header("content-type", "text/css")
 			.header("Cache-Control", "public, max-age=1209600, s-maxage=86400")
-			.body(res.to_string().into())
+			.body(Body::from(STYLE_CSS.clone()))
 			.unwrap_or_default(),
 	)
 }
diff --git a/src/utils.rs b/src/utils.rs
@@ -692,18 +692,20 @@ where
 #[include = "*.css"]
 pub struct ThemeAssets;
 
+static AVAILABLE_THEMES: LazyLock<Vec<String>> = LazyLock::new(|| {
+	let mut themes = vec!["system".to_string()];
+	for file in ThemeAssets::iter() {
+		let chunks: Vec<&str> = file.as_ref().split(".css").collect();
+		themes.push(chunks[0].to_owned());
+	}
+	themes
+});
+
 impl Preferences {
 	/// Build preferences from cookies
 	pub fn new(req: &Request<Body>) -> Self {
-		// Read available theme names from embedded css files.
-		// Always make the default "system" theme available.
-		let mut themes = vec!["system".to_string()];
-		for file in ThemeAssets::iter() {
-			let chunks: Vec<&str> = file.as_ref().split(".css").collect();
-			themes.push(chunks[0].to_owned());
-		}
 		Self {
-			available_themes: themes,
+			available_themes: AVAILABLE_THEMES.clone(),
 			theme: setting(req, "theme"),
 			front_page: setting(req, "front_page"),
 			layout: setting(req, "layout"),
