tests: added extra tests for perm origin dicts and serialization problems

test_special_dict.py

@@ -0,0 +1,72 @@
+import collections
+
+
+class PermOriginDict(dict):
+    """
+    A special dict used for tracking permissions along with their origins.
+
+    `__setitem__` has been overridden to expect a tuple(perm, origin)
+    `__getitem__` will return only the perm
+    `.perm_origin_stack` will return the stack of (perm, origin) set per key
+
+    >>> perms = PermOriginDict()
+    >>> perms['resource'] = 'read', 'default', 1
+    >>> perms['resource']
+    'read'
+    >>> perms['resource'] = 'write', 'admin', 2
+    >>> perms['resource']
+    'write'
+    >>> perms.perm_origin_stack
+    {'resource': [('read', 'default', 1), ('write', 'admin', 2)]}
+    """
+
+    def __init__(self, *args, **kw):
+        dict.__init__(self, *args, **kw)
+        super(PermOriginDict, self).__setattr__('perm_origin_stack', collections.OrderedDict())
+
+    def __setitem__(self, key, perm_origin_obj_id):
+        print(f"setting: {perm_origin_obj_id}")
+        if isinstance(perm_origin_obj_id, tuple):
+            (perm, origin, obj_id) = perm_origin_obj_id
+            self.perm_origin_stack.setdefault(key, []).append((perm, origin, obj_id))
+        else:
+            perm = perm_origin_obj_id
+        dict.__setitem__(self, key, perm)
+
+    # def __getstate__(self):
+    #     dict_state = self.__dict__.copy()
+    #     perm_origin_stack = self.perm_origin_stack.__dict__.copy()
+    #     print(dict_state, perm_origin_stack)
+    #     return dict_state, perm_origin_stack
+    #
+    # def __setstate__(self, state):
+    #     print('setstate called')
+    #     print(f'setstate os {state}')
+    #     self.perm_origin_stack = collections.OrderedDict()
+
+
+dd = PermOriginDict()
+
+dd['key1'] = 'perm1', 'from_where1', 121
+dd['key2'] = 'perm2', 'from_where2', 122
+dd['key3'] = 'perm3', 'from_where3', 123
+dd['key3'] = 'perm4', 'from_where4', 125
+
+
+print(list(dd.keys()))
+print(f"key:{dd['key1']}")
+print(dd.perm_origin_stack)
+
+print ('-- before pickle --')
+
+import pickle
+
+data = pickle.dumps(dd, protocol=pickle.HIGHEST_PROTOCOL)
+print(data)
+
+new_dd = pickle.loads(data)
+
+print ('-- after pickle --')
+print(list(dd.keys()))
+print(f"key:{dd['key1']}")
+print(dd.perm_origin_stack)