add customisable timeout buffer with env variable

snakes/BestBattleSnake.py

@@ -37,6 +37,7 @@ class BestBattleSnake(TemplateSnake):
     self.last_game_id = None
     self.previous_hazards = set()
     self.duel_style = self._get_duel_style()
+    self.timeout_buffer_ms = self._get_timeout_buffer_ms()
 
   def _get_duel_style(self) -> str:
     """Resolve duel tuning style from `BATTLE_SNAKE_DUEL_STYLE` or `DUEL_STYLE`."""
@@ -69,6 +70,14 @@ class BestBattleSnake(TemplateSnake):
       "food_bias": 1.00,
     }
 
+  def _get_timeout_buffer_ms(self) -> int:
+    """Read response-time safety buffer from `SNAKE_TIMEOUT_BUFFER_MS`."""
+    raw_value = os.getenv("SNAKE_TIMEOUT_BUFFER_MS", "120")
+    try:
+      return max(25, int(raw_value))
+    except ValueError:
+      return 120
+
   def choose_move(self, game_data:dict) -> str:
     """Pick the next move from a Battlesnake move request.
 
@@ -77,8 +86,9 @@ class BestBattleSnake(TemplateSnake):
     self.game_board = game_data
     self.calculations = []
     self.duel_style = self._get_duel_style()
+    self.timeout_buffer_ms = self._get_timeout_buffer_ms()
     timeout_ms = (game_data.get_timeout() if hasattr(game_data, "get_timeout") else 500)
-    deadline = perf_counter() + (max(50, int(timeout_ms) - 120) / 1000.0)
+    deadline = perf_counter() + (max(50, int(timeout_ms) - self.timeout_buffer_ms) / 1000.0)
 
     game_id = getattr(game_data, "id", None)
     turn = game_data.get_turn()