Merge pull request #1768 from volatilityfoundation/extensions/process_layer_caching

Extensions: Add cache decorators as appropriate

volatility3/framework/symbols/linux/extensions/__init__.py

@@ -471,6 +471,7 @@ class task_struct(generic.GenericIntelProcess):
 
         return True
 
+    @functools.lru_cache
     def add_process_layer(
         self, config_prefix: Optional[str] = None, preferred_name: Optional[str] = None
     ) -> Optional[str]:

volatility3/framework/symbols/mac/extensions/__init__.py

@@ -2,6 +2,7 @@
 # which is available at https://www.volatilityfoundation.org/license/vsl-v1.0
 #
 import contextlib
+import functools
 import logging
 from typing import Generator, Iterable, Optional, Set, Tuple
 
@@ -17,6 +18,7 @@ class proc(generic.GenericIntelProcess):
     def get_task(self):
         return self.task.dereference().cast("task")
 
+    @functools.lru_cache
     def add_process_layer(
         self, config_prefix: Optional[str] = None, preferred_name: Optional[str] = None
     ) -> Optional[str]:

volatility3/framework/symbols/windows/extensions/__init__.py

@@ -740,9 +740,10 @@ class EPROCESS(generic.GenericIntelProcess, pool.ExecutiveObject):
 
         return True
 
+    @functools.lru_cache
     def add_process_layer(
         self, config_prefix: Optional[str] = None, preferred_name: Optional[str] = None
-    ):
+    ) -> str:
         """Constructs a new layer based on the process's DirectoryTableBase."""
 
         parent_layer = self._context.layers[self.vol.layer_name]