fix: Cache describeTypes at AbstractMISP level.

pymisp/abstract.py

@@ -80,8 +80,35 @@ class MISPEncode(JSONEncoder):
         return JSONEncoder.default(self, obj)
 
 
+if sys.version_info >= (3, 6):
+    from pathlib import Path
+
+    def cache_describe_types():
+        resources_path = Path(__file__).parent / 'data'
+        with (resources_path / 'describeTypes.json').open() as f:
+            dt = json.load(f)
+        return dt['result']
+else:
+    import os
+    if (3, 0) <= sys.version_info < (3, 6):
+        OLD_PY3 = True
+    else:
+        OLD_PY3 = False
+
+    def cache_describe_types():
+        ressources_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')
+        with open(os.path.join(ressources_path, 'describeTypes.json'), 'rb') as f:
+            if OLD_PY3:
+                t = json.loads(f.read().decode())
+            else:
+                t = json.load(f)
+        return t['result']
+
+
 class AbstractMISP(MutableMapping):
 
+    __describe_types = cache_describe_types()
+
     def __init__(self, **kwargs):
         """Abstract class for all the MISP objects"""
         super(AbstractMISP, self).__init__()
@@ -102,6 +129,10 @@ class AbstractMISP(MutableMapping):
             setattr(AbstractMISP, 'add_tag', AbstractMISP.__add_tag)
             setattr(AbstractMISP, 'tags', property(AbstractMISP.__get_tags, AbstractMISP.__set_tags))
 
+    @property
+    def describe_types(self):
+        return self.__describe_types
+
     @property
     def properties(self):
         """All the class public properties that will be dumped in the dictionary, and the JSON export.

pymisp/mispevent.py

@@ -110,15 +110,9 @@ class MISPAttribute(AbstractMISP):
         """
         super(MISPAttribute, self).__init__()
         if not describe_types:
-            ressources_path = os.path.join(os.path.abspath(os.path.dirname(__file__)), 'data')
+            describe_types = self.describe_types
-            with open(os.path.join(ressources_path, 'describeTypes.json'), 'rb') as f:
+        self.__categories = frozenset(describe_types['categories'])
-                if OLD_PY3:
+        self._types = frozenset(describe_types['types'])
-                    t = json.loads(f.read().decode())
-                else:
-                    t = json.load(f)
-            describe_types = t['result']
-        self.__categories = describe_types['categories']
-        self._types = describe_types['types']
         self.__category_type_mapping = describe_types['category_type_mappings']
         self.__sane_default = describe_types['sane_defaults']
         self.__strict = strict
@@ -442,14 +436,9 @@ class MISPEvent(AbstractMISP):
             # This variable is used in add_attribute in order to avoid duplicating the structure
             self._describe_types = describe_types
         else:
-            with open(os.path.join(ressources_path, 'describeTypes.json'), 'rb') as f:
+            self._describe_types = self.describe_types
-                if OLD_PY3:
-                    t = json.loads(f.read().decode())
-                else:
-                    t = json.load(f)
-            self._describe_types = t['result']
 
-        self._types = self._describe_types['types']
+        self._types = frozenset(self._describe_types['types'])
         self.Attribute = []
         self.Object = []
         self.RelatedEvent = []