Allow access to reflection 'get_members'

This also adds some basic tests to ensure the get*members
functions continue to work as expected under basic situations.

Change-Id: Iad9821dca01839b3d9662a16be68225ce99c432c

oslo_utils/reflection.py

@@ -30,7 +30,7 @@ except AttributeError:
 _BUILTIN_MODULES = ('builtins', '__builtin__', '__builtins__', 'exceptions')
 
 
-def _get_members(obj, exclude_hidden):
+def get_members(obj, exclude_hidden=True):
     """Yields the members of an object, filtering by hidden/not hidden."""
     for (name, value) in inspect.getmembers(obj):
         if name.startswith("_") and exclude_hidden:
@@ -40,7 +40,8 @@ def _get_members(obj, exclude_hidden):
 
 def get_member_names(obj, exclude_hidden=True):
     """Get all the member names for a object."""
-    return [name for (name, _obj) in _get_members(obj, exclude_hidden)]
+    return [name for (name, _obj) in
+            get_members(obj, exclude_hidden=exclude_hidden)]
 
 
 def get_class_name(obj, fully_qualified=True):

oslo_utils/tests/test_reflection.py

@@ -50,6 +50,14 @@ def function_with_kwargs(a, b, **kwargs):
     pass
 
 
+class TestObject(object):
+    def _hello(self):
+        pass
+
+    def hi(self):
+        pass
+
+
 class Class(object):
 
     def method(self, c, d):
@@ -74,6 +82,29 @@ class ClassWithInit(object):
         pass
 
 
+class MemberGetTest(test_base.BaseTestCase):
+    def test_get_members_exclude_hidden(self):
+        obj = TestObject()
+        members = list(reflection.get_members(obj, exclude_hidden=True))
+        self.assertEqual(1, len(members))
+
+    def test_get_members_no_exclude_hidden(self):
+        obj = TestObject()
+        members = list(reflection.get_members(obj, exclude_hidden=False))
+        self.assertGreater(len(members), 1)
+
+    def test_get_members_names_exclude_hidden(self):
+        obj = TestObject()
+        members = list(reflection.get_member_names(obj, exclude_hidden=True))
+        self.assertEqual(["hi"], members)
+
+    def test_get_members_names_no_exclude_hidden(self):
+        obj = TestObject()
+        members = list(reflection.get_member_names(obj, exclude_hidden=False))
+        members = [member for member in members if not member.startswith("__")]
+        self.assertEqual(["_hello", "hi"], sorted(members))
+
+
 class CallbackEqualityTest(test_base.BaseTestCase):
     def test_different_simple_callbacks(self):