Add support for generating a default mushroom.

src/server.rs

@@ -1,14 +1,76 @@
-extern crate approx;
+extern crate rocket;
+
+use rocket::http::ContentType;
+use rocket::http::Header;
+
+use crate::mushroom;
+use crate::mushroom::Mushroom;
+use crate::render;
+use crate::translate;
 
 pub async fn run_server() {
     rocket::build()
-        .mount("/", routes![hello])
+        .mount("/", routes![hello, generate_default])
         .launch()
         .await
         .unwrap();
 }
 
-#[get("/")]
-pub fn hello() -> &'static str {
+#[get("/hello")]
+fn hello() -> &'static str {
     "Hello, world!"
 }
+
+#[derive(Responder)]
+enum AsyncBinaryStelResponder {
+    #[response(status = 500)]
+    Error(&'static str),
+    BinaryStl {
+        inner: Vec<u8>,
+        header: ContentType,
+        filename: Header<'static>,
+    },
+}
+
+async fn generate_helper(mushroom: Mushroom) -> AsyncBinaryStelResponder {
+    let result = rocket::tokio::task::spawn_blocking(move || {
+        // Describe our mushroom
+
+        // Generate the binary STL in a byte array.
+        let layers = translate::mushroom(&mushroom, 0.1);
+        let mesh = render::render(&layers, 0.1);
+        let mut binary_stl = Vec::<u8>::new();
+        stl_io::write_stl(&mut binary_stl, mesh.iter()).unwrap();
+
+        // Return the byte array.
+        return binary_stl;
+    })
+    .await;
+
+    return if result.is_ok() {
+        AsyncBinaryStelResponder::BinaryStl {
+            inner: result.unwrap(),
+            header: ContentType::parse_flexible("model/x.stl-binary").unwrap(),
+            filename: Header {
+                name: "Content-Disposition".into(),
+                value: "inline; filename=\"mushroom.stl\"".into(),
+            },
+        }
+    } else {
+        AsyncBinaryStelResponder::Error("Internal JoinError")
+    };
+}
+
+#[get("/generate")]
+async fn generate_default() -> AsyncBinaryStelResponder {
+    // Default mushroom to generate
+    let mushroom = mushroom::Mushroom {
+        stalk_h: 75.0,
+        stalk_r: 10.0,
+        cap_h: 25.0,
+        cap_r: 100.0,
+        cap_style: mushroom::CapStyle::Dome,
+    };
+
+    return generate_helper(mushroom).await;
+}