feat: default service handler, lets all love lain

src/server/mod.rs

@@ -38,6 +38,7 @@ pub async fn start_app(args: crate::args::Args, config: crate::conf::Config) ->
         App::new()
             .app_data(web::Data::new(app))
             .service(services::images::make_scope(ws::IMAGES))
+            .default_service(web::to(services::not_found::not_found))
     })
     .bind(&app.config.server.listen)?
     .run()

src/server/services/mod.rs

@@ -1 +1,2 @@
 pub mod images;
+pub mod not_found;

src/server/services/not_found.rs

@@ -0,0 +1,47 @@
+use actix_web::{
+    HttpRequest, HttpResponse,
+    web::{self, Bytes},
+};
+use futures_util::stream;
+
+use crate::consts;
+
+fn mix_u32s(seed: impl Iterator<Item = u32>) -> u32 {
+    // from wyhash32, according to GPT, should just have a nice bit distribution anyways
+    const U32_BIT_MIXING_CONSTANT: u32 = 0x7feb_352d;
+    const U32_SELF_BIT_MIXING: u32 = 0x846c_a68b;
+
+    let mut random = seed.fold(0_u32, |acc, e| {
+        // mix bits
+        acc.wrapping_add(e.wrapping_mul(U32_BIT_MIXING_CONSTANT))
+    });
+
+    // GPT's suggestion for a nicer distribution, like 8 cpu instructions so whatever
+    random ^= random >> 16;
+    random = random.wrapping_mul(U32_SELF_BIT_MIXING);
+    random ^= random >> 15;
+
+    random
+}
+
+pub async fn not_found(req: HttpRequest) -> HttpResponse {
+    let seed = req.path().as_bytes();
+    let random = mix_u32s(seed.iter().copied().map(u32::from));
+
+    let res = consts::ERROR_ASCII_ARTS[random as usize % consts::ERROR_ASCII_ARTS.len()];
+
+    let method = req.method().as_str();
+    let url = req.path();
+
+    HttpResponse::NotFound()
+        .content_type("text/plain; charset=utf-8")
+        .streaming(stream::iter([
+            Ok::<_, !>(web::Bytes::from(format!(
+                "> {method} '{url}'\n404 NOT FOUND\nLet's all love lain\n\n"
+            ))),
+            Ok(Bytes::from_static(res.as_bytes())),
+        ]))
+    // .body(format!(
+    //     "> {method} '{url}'\n404 NOT FOUND\nLet's all love lain\n\n{res}"
+    // ))
+}