store shield files in local tmp dir

examples/shields/rl/utils.py

@@ -13,6 +13,7 @@ from abc import ABC
 
 import re
 import sys
+import tempfile, datetime, shutil
 
 import gymnasium as gym
 
@@ -51,21 +52,26 @@ class ShieldHandler(ABC):
         pass
 
 class MiniGridShieldHandler(ShieldHandler):
-    def __init__(self, grid_to_prism_binary, grid_file, prism_path, formula, prism_config=None, shield_value=0.9, shield_comparison='absolute') -> None:
-        self.grid_file = grid_file
+    def __init__(self, grid_to_prism_binary, grid_file, prism_path, formula, prism_config=None, shield_value=0.9, shield_comparison='absolute', cleanup=True) -> None:
+        self.tmp_dir_name = f"shielding_files_{datetime.datetime.now().strftime('%Y%m%dT%H%M%S')}_{next(tempfile._get_candidate_names())}"
+        os.mkdir(self.tmp_dir_name)
+        self.grid_file = self.tmp_dir_name + "/" + grid_file
         self.grid_to_prism_binary = grid_to_prism_binary
-        self.prism_path = prism_path
+        self.prism_path = self.tmp_dir_name + "/" + prism_path
         self.prism_config = prism_config
 
         self.formula = formula
         shield_comparison = stormpy.logic.ShieldComparison.ABSOLUTE if shield_comparison == "absolute" else stormpy.logic.ShieldComparison.RELATIVE
         self.shield_expression = stormpy.logic.ShieldExpression(stormpy.logic.ShieldingType.PRE_SAFETY, shield_comparison, shield_value)
 
+        self.cleanup = cleanup
+    def __del__(self):
+        if self.cleanup:
+            shutil.rmtree(self.tmp_dir_name)
 
     def __export_grid_to_text(self, env):
-        f = open(self.grid_file, "w")
+        with open(self.grid_file, "w") as f:
             f.write(env.printGrid(init=True))
-        f.close()
 
 
     def __create_prism(self):
@@ -162,6 +168,7 @@ def common_parser():
     parser.add_argument("--prism_config",  default=None)
     parser.add_argument("--shield_value", default=0.9, type=float)
     parser.add_argument("--shield_comparison", default='absolute', choices=['relative', 'absolute'])
+    parser.add_argument("--cleanup", action=argparse.BooleanOptionalAction, default=True)
     return parser
 
 class MiniWrapper(gym.Wrapper):