make it blazingly fast with caching of css and js

Cargo.lock

@@ -238,6 +238,15 @@ dependencies = [
  "generic-array",
 ]
 
+[[package]]
+name = "bs58"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf88ba1141d185c399bee5288d850d63b8369520c1eafc32a0430b5b6c287bf4"
+dependencies = [
+ "tinyvec",
+]
+
 [[package]]
 name = "bumpalo"
 version = "3.19.0"
@@ -448,6 +457,7 @@ version = "0.1.0"
 dependencies = [
  "askama",
  "axum",
+ "bs58",
  "color-eyre",
  "futures",
  "jiff",
@@ -456,6 +466,7 @@ dependencies = [
  "reqwest",
  "rootcause",
  "serde",
+ "sha2",
  "sqlx",
  "tempfile",
  "tokio",

Cargo.toml

@@ -31,4 +31,6 @@ tracing = { version = "0.1.40", features = ["attributes"] }
 tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
 
 [build-dependencies]
+bs58 = "0.5.1"
 color-eyre = "0.6.3"
+sha2 = "0.10.9"

build.rs

@@ -1,6 +1,29 @@
+use std::path::PathBuf;
+
+use sha2::Digest;
+
 fn main() {
     // Always rerun.
 
+    let index_css = include_str!("static/index.css");
+    let index_js = include_str!("static/index.js");
+
+    let index_css_name = get_file_ref("css", index_css);
+    let index_js_name = get_file_ref("js", index_js);
+
+    let out_dir = PathBuf::from(std::env::var("OUT_DIR").unwrap());
+
+    std::fs::write(
+        out_dir.join("revs.rs"),
+        format!(
+            r#"
+pub const INDEX_CSS_NAME: &str = "{index_css_name}";
+pub const INDEX_JS_NAME: &str = "{index_js_name}";
+    "#
+        ),
+    )
+    .unwrap();
+
     let version = if let Ok(commit) = try_get_commit() {
         match has_no_changes() {
             Ok(true) => commit,
@@ -20,6 +43,15 @@ fn main() {
     println!("cargo:rustc-env=GIT_COMMIT_SHORT={version_short}");
 }
 
+fn get_file_ref(ext: &str, content: &str) -> String {
+    let mut hash = sha2::Sha256::new();
+    hash.update(content);
+    let digest = hash.finalize();
+    let rev = bs58::encode(digest).into_string();
+    let rev = &rev[..16];
+    format!("/{rev}.{ext}")
+}
+
 fn try_get_commit() -> color_eyre::Result<String> {
     if let Ok(overridden) = std::env::var("DOES_IT_BUILD_OVERRIDE_VERSION") {
         return Ok(overridden);

src/web.rs

@@ -16,6 +16,10 @@ use crate::{
     notification, Result,
 };
 
+mod revs {
+    include!(concat!(env!("OUT_DIR"), "/revs.rs"));
+}
+
 #[derive(Clone)]
 pub struct AppState {
     pub db: Db,
@@ -28,8 +32,8 @@ pub async fn webserver(db: Db, notification_repo: String) -> Result<()> {
         .route("/build", get(web_build))
         .route("/target", get(web_target))
         .route("/nightly", get(web_nightly))
-        .route("/index.css", get(index_css))
-        .route("/index.js", get(index_js))
+        .route(revs::INDEX_CSS_NAME, get(index_css))
+        .route(revs::INDEX_JS_NAME, get(index_js))
         .with_state(AppState {
             db,
             notification_repo,
@@ -334,23 +338,33 @@ async fn web_root(State(state): State<AppState>) -> impl IntoResponse {
     })
 }
 
-async fn index_css() -> impl IntoResponse {
+fn reply_static(body: &'static str, content_type: &'static str) -> impl IntoResponse {
+    (
+        [
             (
-        [(
                 axum::http::header::CONTENT_TYPE,
-            axum::http::HeaderValue::from_static("text/css; charset=utf-8"),
-        )],
+                axum::http::HeaderValue::from_static(content_type),
+            ),
+            (
+                axum::http::header::CACHE_CONTROL,
+                axum::http::HeaderValue::from_static("public, max-age=31556952, immutable"),
+            ),
+        ],
+        body,
+    )
+}
+
+async fn index_css() -> impl IntoResponse {
+    reply_static(
         include_str!("../static/index.css"),
+        "text/css; charset=utf-8",
     )
 }
 
 async fn index_js() -> impl IntoResponse {
-    (
-        [(
-            axum::http::header::CONTENT_TYPE,
-            axum::http::HeaderValue::from_static("application/javascript; charset=utf-8"),
-        )],
+    reply_static(
         include_str!("../static/index.js"),
+        "application/javascript; charset=utf-8",
     )
 }
 

templates/build.html

@@ -4,8 +4,8 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Build {{nightly}} {{target}}</title>
-    <link rel="stylesheet" href="/index.css" />
-    <script type="module" defer src="index.js"></script>
+    <link rel="stylesheet" href="{{ revs::INDEX_CSS_NAME }}" />
+    <script type="module" defer src="{{ revs::INDEX_JS_NAME }}"></script>
   </head>
   <body>
     <h1>

templates/index.html

@@ -4,8 +4,8 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>Does it build?</title>
-    <link rel="stylesheet" href="index.css" />
-    <script type="module" defer src="index.js"></script>
+    <link rel="stylesheet" href="{{ revs::INDEX_CSS_NAME }}" />
+    <script type="module" defer src="{{ revs::INDEX_JS_NAME }}"></script>
   </head>
   <body>
     <h1>Does it build?</h1>

templates/nightly.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>{{nightly}} build history</title>
-    <link rel="stylesheet" href="/index.css" />
+    <link rel="stylesheet" href="{{ revs::INDEX_CSS_NAME }}" />
   </head>
   <body>
     <h1>Nightly build state for {{nightly}}</h1>

templates/target.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>{{target}} build history</title>
-    <link rel="stylesheet" href="/index.css" />
+    <link rel="stylesheet" href="{{ revs::INDEX_CSS_NAME }}" />
   </head>
   <body>
     <h1>Target build history for {{target}}</h1>