ugh

src/main.rs

@@ -12,7 +12,9 @@ use std::sync::{Arc, Mutex};
 
 mod battlesnake;
 
-type Cache = Arc<Mutex<HashMap<String, GameState>>>;
+type Cache = Mutex<HashMap<String, GameState>>;
+
+#[derive(Debug, Clone)]
 pub struct GameState {
     path: Option<Vec<battlesnake::Coord>>,
     target: battlesnake::Coord,
@@ -38,7 +40,9 @@ fn begin(cache: State<Cache>, msg: Json<battlesnake::SnakeRequest>) -> Json<batt
         path: path,
     };
 
-    cache.inner().get_mut().unwrap().insert(msg.game.id, gs);
+    if let Some(x) = cache.lock().expect("wanted cache to be unlockable").get_mut(&msg.game.id) {
+        *x = gs;
+    };
 
     Json(battlesnake::StartResponse{
         color: "#5ce8c3".to_string(),
@@ -47,7 +51,11 @@ fn begin(cache: State<Cache>, msg: Json<battlesnake::SnakeRequest>) -> Json<batt
     })
 }
 
-fn find_path(msg: &battlesnake::SnakeRequest, head: &battlesnake::Coord, target: &battlesnake::Coord) -> Option<Vec<battlesnake::Coord>> {
+fn find_path(
+    msg: &battlesnake::SnakeRequest,
+    head: &battlesnake::Coord,
+    target: &battlesnake::Coord
+) -> Option<Vec<battlesnake::Coord>> {
     let path = pathfinding::directed::astar::astar(
         head,
         |n| msg.board.safe_neighbors(n).into_iter(),
@@ -64,25 +72,42 @@ fn find_path(msg: &battlesnake::SnakeRequest, head: &battlesnake::Coord, target:
 }
 
 #[post("/move", format = "json", data = "<msg>")]
-fn make_move(msg: Json<battlesnake::SnakeRequest>) -> Json<battlesnake::MoveResponse> {
+fn make_move(cache: State<Cache>, msg: Json<battlesnake::SnakeRequest>) -> Json<battlesnake::MoveResponse> {
+    let head = msg.you.body[0];
+    if let Some(mut gs) = cache.lock().expect("wanted cache to be unlockable").get(&msg.game.id) {
+        let gs_path = gs.path.as_ref().or_else(|| {
             let target = find_target(&msg);
-    println!("target: {:?}", target);
+            let path = find_path(&msg, &head, &target);
+            gs = &GameState{
+                target: *target,
+                path: path,
+            };
 
-    let head = &msg.you.body[0];
+            path.as_ref()
-    println!("me:     {:?}", head);
+        });
-    for ne in &msg.board.safe_neighbors(&head) {
+        let mut inner = gs_path.expect("what");
-        println!("{:?} {}", ne.0, battlesnake::Line{
+        let next = inner[0];
-            start: &head,
+        inner.pop();
-            end: &ne.0,
+
-        }.direction());
+        if inner.len() == 0 {
+            gs.path = None;
         }
 
-    println!("{:?}", pathfinding::directed::astar::astar(
+        return Json(battlesnake::MoveResponse{
-        head,
+            move_field: battlesnake::Line{
-        |n| msg.board.safe_neighbors(n).into_iter(),
+                start: &head,
-        |n| (battlesnake::manhattan(n, &target) as usize),
+                end: &next,
-        |n| n == target,
+            }.direction().to_string(),
-    ));
+        })
+    }
+
+    let target = find_target(&msg);
+    let path = find_path(&msg, &head, &target);
+    let gs = GameState{
+        target: *target,
+        path: path,
+    };
+    println!("{:?}", gs);
 
     Json(battlesnake::MoveResponse {
         move_field: "up".to_string(),
@@ -112,13 +137,12 @@ fn find_target<'a>(gs: &'a battlesnake::SnakeRequest) -> &'a battlesnake::Coord
 fn main() {
     let map = HashMap::<String, GameState>::new();
     let mutex_map = Mutex::from(map);
-    let arc_mutex_map = Arc::from(mutex_map);
     rocket::ignite().mount("/", routes![
         index,
         begin,
         ping,
         make_move,
     ])
-        .manage(arc_mutex_map)
+        .manage(mutex_map)
         .launch();
 }