Actually working persistence by overloading a dict

persistence/main.py

@@ -0,0 +1,68 @@
+import json
+import os
+
+
+
+class PersistentDict(dict):
+    """"""
+    def __init__(self, file_name, *args, **kwargs):
+
+        super().__init__(*args, **kwargs)
+        self.path = file_name
+        self.last_action = ""
+        if not os.path.exists(self.path):
+            with open(self.path, "a") as f:
+                f.write("{}")
+        self.read_dict()
+
+
+    def write_dict(self):
+        with open(self.path, "w") as f:
+            json.dump(self, f)
+        self.last_action = "w"
+
+    def read_dict(self):
+        with open(self.path) as f:
+            tmp = dict(json.load(f))
+            for key in tmp:
+                super().__setitem__(key, tmp[key])
+        self.last_action = "r"
+
+
+    def __setitem__(self, key, value):
+        if self.last_action != "r":
+            self.read_dict()
+        
+        super().__setitem__(key,value)
+        self.write_dict() # writes 'self' to a json file.
+
+    def __getitem__(self, key):
+        if self.last_action != "r":
+            self.read_dict()
+        
+        ret_val = super().__getitem__(key)
+        if type(ret_val) == dict:
+            ret_val = HookedDict(key, self, ret_val)
+
+        return ret_val
+    
+    def clear(self):
+        super().clear()
+        self.write_dict()
+        return {}
+
+class HookedDict(dict):
+    def __init__(self, own_name, parent_dict, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.name = own_name
+        self.parent = parent_dict
+    
+    def __setitem__(self, key, value):
+        super().__setitem__(key, value)
+        self.parent.__setitem__(self.name, self)
+
+    def __getitem__(self, key):
+        ret_val = super().__getitem__(key)
+        if type(ret_val) == dict:
+            ret_val = HookedDict(key, self, ret_val)
+        return ret_val