v0.8.15

build.rs

@@ -1,5 +1,5 @@
 use serde_json::{json, Value};
-use std::{env, fs, path::PathBuf};
+use std::{env, fs, path::{Path, PathBuf}};
 
 fn required_string<'a>(meta: &'a Value, key: &str, file: &str) -> &'a str {
     meta.get(key)
@@ -8,11 +8,87 @@ fn required_string<'a>(meta: &'a Value, key: &str, file: &str) -> &'a str {
         .unwrap_or_else(|| panic!("{file}: meta.{key} must be a non-empty string"))
 }
 
+
+fn fnv1a_update(mut hash: u64, bytes: &[u8]) -> u64 {
+    for byte in bytes {
+        hash ^= u64::from(*byte);
+        hash = hash.wrapping_mul(0x100000001b3);
+    }
+    hash
+}
+
+fn content_hash(bytes: &[u8]) -> String {
+    format!("{:016x}", fnv1a_update(0xcbf29ce484222325, bytes))
+}
+
+const APP_JS_MODULES: &[&str] = &[
+    "core.js",
+    "forms.js",
+    "bootstrap.js",
+    "dashboard.js",
+    "entities.js",
+    "settings-ui.js",
+    "router.js",
+    "navigation.js",
+    "charts.js",
+    "history.js",
+    "realtime.js",
+    "events.js",
+    "settings.js",
+    "main.js",
+];
+
+fn bundle_app_js(web_dir: &Path) -> String {
+    let js_dir = web_dir.join("js");
+    println!("cargo:rerun-if-changed={}", js_dir.display());
+
+    let mut bundle = String::new();
+    for &filename in APP_JS_MODULES {
+        let path = js_dir.join(filename);
+        println!("cargo:rerun-if-changed={}", path.display());
+        let source = fs::read_to_string(&path)
+            .unwrap_or_else(|error| panic!("cannot read {}: {error}", path.display()));
+        bundle.push_str(&source);
+        if !source.ends_with('\n') {
+            bundle.push('\n');
+        }
+    }
+    bundle
+}
+
 fn main() {
     let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
     let lang_dir = manifest_dir.join("lang");
+    let web_dir = manifest_dir.join("web");
     println!("cargo:rerun-if-changed={}", lang_dir.display());
 
+    let theme_init_path = web_dir.join("theme-init.js");
+    let styles_path = web_dir.join("styles.css");
+    let index_path = web_dir.join("index.html");
+    let not_found_path = web_dir.join("404.html");
+    let sw_path = web_dir.join("sw.js");
+    let manifest_path = web_dir.join("manifest.webmanifest");
+    let favicon_path = web_dir.join("favicon.svg");
+    for path in [&theme_init_path, &styles_path, &index_path, &not_found_path, &sw_path, &manifest_path, &favicon_path] {
+        println!("cargo:rerun-if-changed={}", path.display());
+    }
+
+    let app_js = bundle_app_js(&web_dir);
+    let app_js_hash = content_hash(app_js.as_bytes());
+    let theme_init_bytes = fs::read(&theme_init_path).unwrap_or_else(|error| panic!("cannot read {}: {error}", theme_init_path.display()));
+    let styles_bytes = fs::read(&styles_path).unwrap_or_else(|error| panic!("cannot read {}: {error}", styles_path.display()));
+    let theme_init_hash = content_hash(&theme_init_bytes);
+    let styles_hash = content_hash(&styles_bytes);
+    let app_js_asset_path = format!("/app-{}.js", &app_js_hash[..12]);
+    let theme_init_asset_path = format!("/theme-init-{}.js", &theme_init_hash[..12]);
+    let styles_asset_path = format!("/styles-{}.css", &styles_hash[..12]);
+
+    let mut build_hash = fnv1a_update(0xcbf29ce484222325u64, app_js.as_bytes());
+    for path in [&theme_init_path, &styles_path, &index_path, &not_found_path, &sw_path, &manifest_path, &favicon_path] {
+        let bytes = fs::read(path).unwrap_or_else(|error| panic!("cannot read {}: {error}", path.display()));
+        build_hash = fnv1a_update(build_hash, &bytes);
+    }
+
     let mut files: Vec<PathBuf> = fs::read_dir(&lang_dir)
         .unwrap_or_else(|error| panic!("cannot read {}: {error}", lang_dir.display()))
         .filter_map(Result::ok)
@@ -39,6 +115,7 @@ fn main() {
 
         let source = fs::read_to_string(&path)
             .unwrap_or_else(|error| panic!("cannot read {}: {error}", path.display()));
+        build_hash = fnv1a_update(build_hash, source.as_bytes());
         let document: Value = serde_json::from_str(&source)
             .unwrap_or_else(|error| panic!("{filename}: invalid JSON: {error}"));
         let root_object = document.as_object().unwrap_or_else(|| panic!("{filename}: language pack root must be an object"));
@@ -85,6 +162,10 @@ fn main() {
 
     let mut generated = String::new();
     generated.push_str("// @generated by build.rs - do not edit.\n");
+    generated.push_str(&format!("pub const APP_JS_ASSET_PATH: &str = {:?};\n", app_js_asset_path));
+    generated.push_str(&format!("pub const THEME_INIT_ASSET_PATH: &str = {:?};\n", theme_init_asset_path));
+    generated.push_str(&format!("pub const STYLES_CSS_ASSET_PATH: &str = {:?};\n", styles_asset_path));
+    generated.push_str(&format!("pub const ASSET_BUILD_ID: &str = \"{:016x}\";\n", build_hash));
     generated.push_str(&format!("pub const LANGUAGE_MANIFEST_JSON: &str = {:?};\n", manifest_json));
     generated.push_str("pub const LANGUAGE_ASSETS: &[(&str, &str)] = &[\n");
     for (code, path) in assets {
@@ -97,5 +178,6 @@ fn main() {
     generated.push_str("];\n");
 
     let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR"));
+    fs::write(out_dir.join("app.bundle.js"), app_js).expect("write generated app.bundle.js");
     fs::write(out_dir.join("languages.rs"), generated).expect("write generated languages.rs");
 }