Replace getargspec with getfullargspec

inspect.getargspec() is deprecated since py3

[1] https://docs.python.org/3/library/inspect.html#inspect.getargspec

Change-Id: I6fbdf942dd192351e135430997c15ea92e7fb8af

nova/cmd/common.py

@@ -18,6 +18,7 @@
 """
 
 import argparse
+import inspect
 import traceback
 
 from oslo_log import log as logging
@@ -26,7 +27,6 @@ import nova.conf
 import nova.db.api
 from nova import exception
 from nova.i18n import _
-from nova import utils
 
 CONF = nova.conf.CONF
 LOG = logging.getLogger(__name__)
@@ -65,7 +65,7 @@ def validate_args(fn, *args, **kwargs):
     :param arg: the positional arguments supplied
     :param kwargs: the keyword arguments supplied
     """
-    argspec = utils.getargspec(fn)
+    argspec = inspect.getfullargspec(fn)
 
     num_defaults = len(argspec.defaults or [])
     required_args = argspec.args[:len(argspec.args) - num_defaults]

nova/network/neutron.py

@@ -20,6 +20,7 @@ API and utilities for nova-network interactions.
 
 import copy
 import functools
+import inspect
 import time
 import typing as ty
 
@@ -133,7 +134,7 @@ def refresh_cache(f):
 
     Requires context and instance as function args
     """
-    argspec = utils.getargspec(f)
+    argspec = inspect.getfullargspec(f)
 
     @functools.wraps(f)
     def wrapper(self, context, *args, **kwargs):

nova/test.py

@@ -635,8 +635,8 @@ class TestCase(base.BaseTestCase):
 
         for name in sorted(implmethods.keys()):
             # NOTE(stephenfin): We ignore type annotations
-            baseargs = utils.getargspec(basemethods[name])[:-1]
-            implargs = utils.getargspec(implmethods[name])[:-1]
+            baseargs = inspect.getfullargspec(basemethods[name])[:-1]
+            implargs = inspect.getfullargspec(implmethods[name])[:-1]
 
             self.assertEqual(baseargs, implargs,
                              "%s args don't match base class %s" %
@@ -709,7 +709,7 @@ class SubclassSignatureTestCase(testtools.TestCase, metaclass=abc.ABCMeta):
                 # instead.
                 method = getattr(method, '__wrapped__')
 
-            argspecs[name] = utils.getargspec(method)
+            argspecs[name] = inspect.getfullargspec(method)
 
         return argspecs
 

nova/tests/unit/objects/test_objects.py

@@ -16,6 +16,7 @@ import collections
 import contextlib
 import copy
 import datetime
+import inspect
 import os
 import pprint
 
@@ -1318,12 +1319,12 @@ class TestObjEqualPrims(_BaseTestCase):
 
 class TestObjMethodOverrides(test.NoDBTestCase):
     def test_obj_reset_changes(self):
-        args = utils.getargspec(base.NovaObject.obj_reset_changes)
+        args = inspect.getfullargspec(base.NovaObject.obj_reset_changes)
         obj_classes = base.NovaObjectRegistry.obj_classes()
         for obj_name in obj_classes:
             obj_class = obj_classes[obj_name][0]
             self.assertEqual(args,
-                utils.getargspec(obj_class.obj_reset_changes))
+                inspect.getfullargspec(obj_class.obj_reset_changes))
 
 
 class TestObjectsDefaultingOnInit(test.NoDBTestCase):

nova/tests/unit/virt/libvirt/test_imagebackend.py

@@ -15,6 +15,7 @@
 
 import base64
 import errno
+import inspect
 import os
 import shutil
 import tempfile
@@ -38,7 +39,6 @@ from nova import objects
 from nova.storage import rbd_utils
 from nova import test
 from nova.tests.unit import fake_processutils
-from nova import utils
 from nova.virt.image import model as imgmodel
 from nova.virt import images
 from nova.virt.libvirt import config as vconfig
@@ -1488,8 +1488,10 @@ class RbdTestCase(_ImageTestCase, test.NoDBTestCase):
         self.assertEqual(fake_processutils.fake_execute_get_log(), [])
 
     def test_parent_compatible(self):
-        self.assertEqual(utils.getargspec(imagebackend.Image.libvirt_info),
-                         utils.getargspec(self.image_class.libvirt_info))
+        self.assertEqual(
+            inspect.getfullargspec(imagebackend.Image.libvirt_info),
+            inspect.getfullargspec(self.image_class.libvirt_info)
+        )
 
     def test_image_path(self):
 

nova/utils.py

@@ -80,12 +80,6 @@ _FILE_CACHE = {}
 _SERVICE_TYPES = service_types.ServiceTypes()
 
 
-if hasattr(inspect, 'getfullargspec'):
-    getargspec = inspect.getfullargspec
-else:
-    getargspec = inspect.getargspec
-
-
 # NOTE(mikal): this seems to have to stay for now to handle os-brick
 # requirements. This makes me a sad panda.
 def get_root_helper():
@@ -553,7 +547,7 @@ def expects_func_args(*args):
         @functools.wraps(dec)
         def _decorator(f):
             base_f = safe_utils.get_wrapped_function(f)
-            argspec = getargspec(base_f)
+            argspec = inspect.getfullargspec(base_f)
             if argspec[1] or argspec[2] or set(args) <= set(argspec[0]):
                 # NOTE (ndipanov): We can't really tell if correct stuff will
                 # be passed if it's a function with *args or **kwargs so