[client] Replace dict by proper caching

Author: SamuelHassine

pycti/utils/opencti_stix2.py

@@ -10,6 +10,7 @@
 import datefinder
 import dateutil.parser
 import pytz
+from cachetools import TTLCache
 
 from pycti.api import LOGGER as API_LOGGER
 from pycti.entities.opencti_identity import Identity
@@ -42,7 +43,7 @@ class OpenCTIStix2:
     def __init__(self, opencti):
         self.opencti = opencti
         self.stix2_update = OpenCTIStix2Update(opencti)
-        self.mapping_cache = {}
+        self.mapping_cache = TTLCache(maxsize=10000, ttl=3600)
 
     ######### UTILS
     # region utils

requirements.txt

@@ -8,3 +8,4 @@ requests~=2.28.2
 setuptools~=66.1.1
 sseclient~=0.0.27
 stix2~=3.0.1
+cachetools~=5.3.0

setup.cfg

@@ -42,6 +42,7 @@ install_requires =
     setuptools~=66.1.1
     sseclient~=0.0.27
     stix2~=3.0.1
+    cachetools~=5.3.0
 
 [options.extras_require]
 dev =