give the snake more thinging time

battlesnake/src/logic.rs

@@ -12,7 +12,6 @@
 
 use core::f64;
 use std::{
-    cell::Cell,
     collections::{BTreeMap, HashMap},
     sync::{Arc, LazyLock, Mutex},
     time::{Duration, Instant},
@@ -42,9 +41,9 @@ pub fn info() -> Value {
     })
 }
 
-#[derive(Debug, PartialEq, Eq, Clone)]
+#[derive(Debug, Clone)]
 struct GameInfo {
-    calculation_time: Cell<Duration>,
+    calculation_time: Arc<Mutex<Duration>>,
     token_mapping: Arc<BTreeMap<String, SnakeToken>>,
     my_token: SnakeToken,
 }
@@ -64,7 +63,9 @@ pub fn start(game: &Game, _turn: i32, board: &Board, you: &Battlesnake) {
     game_infos.insert(
         (game.id.clone(), you.id.clone()),
         GameInfo {
-            calculation_time: Cell::new(Duration::from_millis(50)),
+            calculation_time: Arc::new(Mutex::new(Duration::from_millis(
+                u64::from(game.timeout) / 2,
+            ))),
             token_mapping,
             my_token,
         },
@@ -94,7 +95,9 @@ pub fn get_move(game: &Game, turn: i32, board: &Board, you: &Battlesnake) -> Opt
             let token_mapping = Arc::new(SnakeToken::from_board(board));
             let my_token = token_mapping[&you.id];
             GameInfo {
-                calculation_time: Cell::new(Duration::from_millis(50)),
+                calculation_time: Arc::new(Mutex::new(Duration::from_millis(
+                    u64::from(game.timeout) / 2,
+                ))),
                 token_mapping,
                 my_token,
             }
@@ -117,15 +120,25 @@ pub fn get_move(game: &Game, turn: i32, board: &Board, you: &Battlesnake) -> Opt
     }
 
     // do some latency compensation
-    game_info.calculation_time.set(
-        game_info.calculation_time.get()
-            + Duration::from_millis(
-                u64::from(
-                    game.timeout * 3 / 4 - you.latency.parse().unwrap_or(game.timeout * 3 / 4),
-                ) / 3,
-            ),
-    );
-    let deadline = start + game_info.calculation_time.get();
+    let deadline = start
+        + game_info.calculation_time.lock().map_or_else(
+            |_| Duration::from_millis(u64::from(game.timeout) / 2),
+            |mut guard| {
+                let new_duration = *guard
+                    + Duration::from_millis(
+                        u64::from(game.timeout) * 7 / 8
+                            - you
+                                .latency
+                                .parse()
+                                .unwrap_or(u64::from(game.timeout) * 7 / 8),
+                    );
+                *guard = new_duration.clamp(
+                    Duration::from_millis(1),
+                    Duration::from_millis(u64::from(game.timeout) * 7 / 8),
+                );
+                *guard
+            },
+        );
 
     let mut tree = Node::default();