Replace deprecated inspect function in Python 3

Replace deprecated inspect.getargspec [1] with
inspect.getfullargspec [2], which is not deprecated in Python 3.x

inspect.getargspec is kept for Python 2.x, as the new function is
not available for it.

This was causing keystone unit tests output to be flooded with
deprecation warnings [3]

[1] https://docs.python.org/3/library/inspect.html#inspect.getargspec
[2] https://docs.python.org/3/library/inspect.html#inspect.getfullargspec
[3] http://logs.openstack.org/43/474543/3/check/gate-keystone-python35/ae16a96/console.html.gz#_2017-06-15_22_15_16_925141

Change-Id: Ia37ac562122d6315be1ce1277a6753a9caf15998

1 files changed, 8 insertions, 2 deletions

diff --git a/oslo_middleware/base.py b/oslo_middleware/base.py
index de98288..ed2e3bb 100644
--- a/oslo_middleware/base.py
+++ b/oslo_middleware/base.py
@@ -15,7 +15,13 @@
 
 """Base class(es) for WSGI Middleware."""
 
-from inspect import getargspec
+import six
+
+if six.PY2:
+    from inspect import getargspec as getfullargspec
+else:
+    from inspect import getfullargspec
+
 import webob.dec
 import webob.request
 import webob.response
@@ -124,7 +130,7 @@ class ConfigurableMiddleware(object):
             return response
         response = req.get_response(self.application)
 
-        (args, varargs, varkw, defaults) = getargspec(self.process_response)
+        args = getfullargspec(self.process_response)[0]
         if 'request' in args:
             return self.process_response(response, request=req)
         return self.process_response(response)