improve sqlpage binary size by compressing assets

Author: lovasoa

CHANGELOG.md

@@ -6,6 +6,9 @@
   This allows pages to load faster, and to get a better score on google's performance audits, potentially improving your position in search results.
     - This also makes it possible to host a SQLPage website on an intranet without access to the internet.
     - Fixes https://github.com/lovasoa/SQLpage/issues/37
+ - store compressed frontend assets in the SQLPage binary:
+    - smaller SQLPage binary
+    - Faster page loads, less work on the server
 
 ## 0.9.2 (2023-08-01)
 

Cargo.lock

@@ -47,4 +47,5 @@ rand = "0.8.5"
 
 [build-dependencies]
 awc = { version = "3", features = ["rustls"] }
-actix-rt = "2.8"
+actix-rt = "2.8"
+libflate = "2"

Cargo.toml

@@ -3,8 +3,9 @@ use std::collections::hash_map::DefaultHasher;
 use std::fs::File;
 use std::hash::Hasher;
 use std::io::Read;
-use std::io::{BufRead, BufReader, BufWriter, Write};
+use std::io::{BufRead, BufReader, Write};
 use std::path::{Path, PathBuf};
+use libflate::gzip;
 
 #[actix_rt::main]
 async fn main() {
@@ -48,7 +49,7 @@ async fn download_deps(path_in: &str, path_out: PathBuf) {
 
 async fn process_input_file(path_out: &Path, original: File) {
     let client = awc::Client::default();
-    let mut outfile = BufWriter::new(File::create(path_out).unwrap());
+    let mut outfile = gzip::Encoder::new(File::create(path_out).unwrap()).unwrap();
     for l in BufReader::new(original).lines() {
         let line = l.unwrap();
         if line.starts_with("/* !include https://") {
@@ -70,6 +71,7 @@ async fn process_input_file(path_out: &Path, original: File) {
             writeln!(outfile, "{}", line).unwrap();
         }
     }
+    outfile.finish().as_result().expect("Unable to write compressed frontend asset");
 }
 
 // Given a filename, creates a new unique filename based on the file contents

build.rs

@@ -1,6 +1,6 @@
 use crate::utils::static_filename;
 use actix_web::{
-    http::header::{CacheControl, CacheDirective, ETag, EntityTag, Header, IfNoneMatch},
+    http::header::{CacheControl, CacheDirective, ETag, EntityTag, Header, IfNoneMatch, ContentEncoding},
     web, HttpRequest, HttpResponse, Resource,
 };
 
@@ -20,6 +20,7 @@ macro_rules! static_file_endpoint {
                     CacheDirective::Extension("immutable".to_owned(), None),
                 ]))
                 .insert_header(ETag(file_etag))
+                .insert_header(ContentEncoding::Gzip)
                 .body(
                     &include_bytes!(concat!(env!("OUT_DIR"), "/", $filestem, ".", $extension))[..],
                 )