update

src/main.rs

@@ -25,6 +25,8 @@ mod variant;
 
 #[launch]
 async fn rocket() -> _ {
+    env_logger::init();
+
     let cors = rocket_cors::CorsOptions {
         allowed_origins: rocket_cors::AllowedOrigins::all(),
         allowed_methods: vec![Method::Get, Method::Post, Method::Options]
@@ -53,7 +55,8 @@ async fn rocket() -> _ {
                 routes::item::demand_route,
                 routes::item::transaction_route,
                 routes::item::inventory_route,
-                routes::item::variant_stat_route
+                routes::item::variant_stat_route,
+                routes::item::unique_field_route
             ],
         )
         .manage(itemdb)

src/routes/item/mod.rs

@@ -55,3 +55,24 @@ pub async fn transaction_route(transaction: &str) -> FallibleApiResponse {
         .ok_or_else(|| api_error("No transaction with this UUID"))?;
     Ok(t.api_json())
 }
+
+/// Returns unique values for a field
+#[get("/item/<item_id>/<variant_id>/unique?<field>")]
+pub async fn unique_field_route(
+    item_id: &str,
+    variant_id: &str,
+    field: &str,
+    itemdb: &State<ItemDB>,
+) -> FallibleApiResponse {
+    let variant = itemdb
+        .get_item(item_id)
+        .ok_or_else(item_does_not_exist_error)?
+        .variant(variant_id)
+        .ok_or_else(variant_does_not_exist_error)?;
+
+    match field {
+        "origin" => Ok(json!(variant.get_unique_origins().await)),
+        "destination" => Ok(json!(variant.get_unique_destinations().await)),
+        _ => Err(api_error("Unknown field")),
+    }
+}