Simplify wsgify()

Change-Id: Iec399aa8b58e72152a17265f2af1131f02667131

swift/common/swob.py

@@ -43,7 +43,6 @@ from email.utils import parsedate
 import re
 import random
 import functools
-import inspect
 from io import BytesIO
 
 import six
@@ -1563,23 +1562,15 @@ def wsgify(func):
     return a Response object into WSGI callables.  Also catches any raised
     HTTPExceptions and treats them as a returned Response.
     """
-    argspec = inspect.getargspec(func)
-    if argspec.args and argspec.args[0] == 'self':
-        @functools.wraps(func)
-        def _wsgify_self(self, env, start_response):
-            try:
-                return func(self, Request(env))(env, start_response)
-            except HTTPException as err_resp:
-                return err_resp(env, start_response)
-        return _wsgify_self
-    else:
-        @functools.wraps(func)
-        def _wsgify_bare(env, start_response):
-            try:
-                return func(Request(env))(env, start_response)
-            except HTTPException as err_resp:
-                return err_resp(env, start_response)
-        return _wsgify_bare
+    @functools.wraps(func)
+    def _wsgify(*args):
+        env, start_response = args[-2:]
+        new_args = args[:-2] + (Request(env), )
+        try:
+            return func(*new_args)(env, start_response)
+        except HTTPException as err_resp:
+            return err_resp(env, start_response)
+    return _wsgify
 
 
 class StatusMap(object):

test/unit/common/test_swob.py

@@ -914,6 +914,22 @@ class TestRequest(unittest.TestCase):
         self.assertEqual(used_req[0].path, '/hi/there')
         self.assertEqual(resp.status_int, 200)
 
+    def test_wsgify_method(self):
+        class _wsgi_class(object):
+            def __init__(self):
+                self.used_req = []
+
+            @swob.wsgify
+            def __call__(self, req):
+                self.used_req.append(req)
+                return swob.Response(b'200 OK')
+
+        req = swob.Request.blank('/hi/there')
+        handler = _wsgi_class()
+        resp = req.get_response(handler)
+        self.assertIs(handler.used_req[0].environ, req.environ)
+        self.assertEqual(resp.status_int, 200)
+
     def test_wsgify_raise(self):
         used_req = []