From 1df3e30003fd9a28546b185bc0bc06012501fedf Mon Sep 17 00:00:00 2001
From: Daniel Goldberg <danielg@guardicore.com>
Date: Wed, 30 Oct 2019 15:07:45 +0200
Subject: [PATCH] Refactor plugin loading into independent module

---
 .../network/fingerprinter_manager.py          | 33 +--------------
 monkey/infection_monkey/utils/load_plugins.py | 41 +++++++++++++++++++
 2 files changed, 43 insertions(+), 31 deletions(-)
 create mode 100644 monkey/infection_monkey/utils/load_plugins.py

diff --git a/monkey/infection_monkey/network/fingerprinter_manager.py b/monkey/infection_monkey/network/fingerprinter_manager.py
index 5b1005690..5eaeeafdb 100644
--- a/monkey/infection_monkey/network/fingerprinter_manager.py
+++ b/monkey/infection_monkey/network/fingerprinter_manager.py
@@ -1,42 +1,13 @@
-import importlib
-import inspect
 import logging
-from os.path import dirname, basename, isfile, join
-import glob
-
+from infection_monkey.utils.load_plugins import get_instances
 from infection_monkey.network.HostFinger import HostFinger
 
 LOG = logging.getLogger(__name__)
 
 
-def get_fingerprint_files():
-    """
-    Gets all files under current directory(/actions)
-    :return: list of all files without .py ending
-    """
-    files = glob.glob(join(dirname(__file__), "*.py"))
-    return [basename(f)[:-3] for f in files if isfile(f) and not f.endswith('__init__.py')]
-
-
 def get_fingerprint_instances():
     """
     Returns the fingerprint objects according to configuration as a list
     :return: A list of HostFinger objects.
     """
-    fingerprinter_objects = []
-    fingerprint_files = get_fingerprint_files()
-    # Go through all of files
-    for file in fingerprint_files:
-        # Import module from that file
-        module = importlib.import_module(__package__ + '.' + file)
-        # Get all classes in a module
-        classes = [m[1] for m in inspect.getmembers(module, inspect.isclass)
-                   if ((m[1].__module__ == module.__name__) and issubclass(m[1], HostFinger))]
-        # Get object from class
-        for class_object in classes:
-            LOG.debug("Checking if should run Fingerprinter {}".format(class_object.__name__))
-            if class_object.should_run(class_object.__name__):
-                fingerprinter = class_object()
-                fingerprinter_objects.append(fingerprinter)
-                LOG.debug("Added fingerprinter {} to fingerprint list".format(class_object.__name__))
-    return fingerprinter_objects
+    return get_instances(__package__, __file__, HostFinger)
diff --git a/monkey/infection_monkey/utils/load_plugins.py b/monkey/infection_monkey/utils/load_plugins.py
new file mode 100644
index 000000000..bb075e5e8
--- /dev/null
+++ b/monkey/infection_monkey/utils/load_plugins.py
@@ -0,0 +1,41 @@
+import importlib
+import inspect
+import logging
+from os.path import dirname, basename, isfile, join
+import glob
+
+LOG = logging.getLogger(__name__)
+
+
+def _get_candidate_files(base_package_file):
+    """
+    Gets all files under current directory(/actions)
+    :return: list of all files without .py ending
+    """
+    files = glob.glob(join(dirname(base_package_file), "*.py"))
+    return [basename(f)[:-3] for f in files if isfile(f) and not f.endswith('__init__.py')]
+
+
+def get_instances(base_package_name, base_package_file, parent_class):
+    """
+    Returns the parent_class type objects from base_package_spec according to configuration
+    :return: A list of parent_class objects.
+    """
+    objects = []
+    candidate_files = _get_candidate_files(base_package_file)
+    # Go through all of files
+    for file in candidate_files:
+        # Import module from that file
+        module = importlib.import_module(base_package_name + '.' + file)
+        # Get all classes in a module
+        # m[1] because return object is (name,class)
+        classes = [m[1] for m in inspect.getmembers(module, inspect.isclass)
+                   if ((m[1].__module__ == module.__name__) and issubclass(m[1], parent_class))]
+        # Get object from class
+        for class_object in classes:
+            LOG.debug("Checking if should run object {}".format(class_object.__name__))
+            if class_object.should_run(class_object.__name__):
+                instance = class_object()
+                objects.append(instance)
+                LOG.debug("Added {} to list".format(class_object.__name__))
+    return objects