Drop six usages

Support of python 2.7 was dropped during the Ussuri cycle so we can now
drop six usages too.

Change-Id: I56a9c0641fd9bce613943ff938d33178d263eedf

lower-constraints.txt

@@ -52,7 +52,6 @@ requestsexceptions==1.2.0
 restructuredtext-lint==1.1.1
 rfc3986==0.3.1
 Routes==2.3.1
-six==1.10.0
 smmap==0.9.0
 snowballstemmer==1.2.1
 stestr==2.0.0

oslo_service/loopingcall.py

@@ -15,6 +15,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import functools
 import random
 import sys
 import time
@@ -26,7 +27,6 @@ from oslo_utils import eventletutils
 from oslo_utils import excutils
 from oslo_utils import reflection
 from oslo_utils import timeutils
-import six
 
 from oslo_service._i18n import _
 
@@ -428,7 +428,7 @@ class RetryDecorator(object):
                         return self._sleep_time
             raise LoopingCallDone(result)
 
-        @six.wraps(f)
+        @functools.wraps(f)
         def func(*args, **kwargs):
             loop = DynamicLoopingCall(_func, *args, **kwargs)
             evt = loop.start(periodic_interval_max=self._max_sleep_time)

oslo_service/periodic_task.py

@@ -14,7 +14,6 @@
 import copy
 import logging
 import random
-import six
 import time
 from time import monotonic as now
 
@@ -169,8 +168,7 @@ def _nearest_boundary(last_run, spacing):
     return current_time - offset + jitter
 
 
-@six.add_metaclass(_PeriodicTasksMeta)
-class PeriodicTasks(object):
+class PeriodicTasks(metaclass=_PeriodicTasksMeta):
     def __init__(self, conf):
         super(PeriodicTasks, self).__init__()
         self.conf = conf

oslo_service/service.py

@@ -29,7 +29,6 @@ import logging
 import os
 import random
 import signal
-import six
 import sys
 import time
 
@@ -90,8 +89,7 @@ def _check_service_base(service):
                         % {'service': service, 'base': ServiceBase})
 
 
-@six.add_metaclass(abc.ABCMeta)
-class ServiceBase(object):
+class ServiceBase(metaclass=abc.ABCMeta):
     """Base class for all services."""
 
     @abc.abstractmethod
@@ -126,8 +124,7 @@ class Singleton(type):
         return cls._instances[cls]
 
 
-@six.add_metaclass(Singleton)
-class SignalHandler(object):
+class SignalHandler(metaclass=Singleton):
 
     def __init__(self, *args, **kwargs):
         super(SignalHandler, self).__init__(*args, **kwargs)
@@ -829,7 +826,7 @@ def launch(conf, service, workers=1, restart_method='reload'):
     :returns: instance of a launcher that was used to launch the service
     """
 
-    if workers is not None and not isinstance(workers, six.integer_types):
+    if workers is not None and not isinstance(workers, int):
         raise TypeError(_("Type of workers should be int!"))
 
     if workers is not None and workers <= 0:

oslo_service/tests/test_wsgi.py

@@ -18,7 +18,6 @@
 
 import os
 import platform
-import six
 import socket
 import tempfile
 import testtools
@@ -279,7 +278,7 @@ class TestWSGIServerWithSSL(WsgiTestCase):
                     key_file=key_file_name,
                     group=sslutils.config_section)
 
-    @testtools.skipIf(six.PY3, "bug/1482633: test hangs on Python 3")
+    @testtools.skip("bug/1482633: test hangs on Python 3")
     def test_ssl_server(self):
         def test_app(env, start_response):
             start_response('200 OK', {})
@@ -298,7 +297,7 @@ class TestWSGIServerWithSSL(WsgiTestCase):
         fake_ssl_server.stop()
         fake_ssl_server.wait()
 
-    @testtools.skipIf(six.PY3, "bug/1482633: test hangs on Python 3")
+    @testtools.skip("bug/1482633: test hangs on Python 3")
     def test_two_servers(self):
         def test_app(env, start_response):
             start_response('200 OK', {})
@@ -332,7 +331,7 @@ class TestWSGIServerWithSSL(WsgiTestCase):
     @testtools.skipIf(platform.mac_ver()[0] != '',
                       'SO_REUSEADDR behaves differently '
                       'on OSX, see bug 1436895')
-    @testtools.skipIf(six.PY3, "bug/1482633: test hangs on Python 3")
+    @testtools.skip("bug/1482633: test hangs on Python 3")
     def test_socket_options_for_ssl_server(self):
         # test normal socket options has set properly
         self.config(tcp_keepidle=500)
@@ -352,7 +351,7 @@ class TestWSGIServerWithSSL(WsgiTestCase):
         server.wait()
 
     @testtools.skipIf(not netutils.is_ipv6_enabled(), "no ipv6 support")
-    @testtools.skipIf(six.PY3, "bug/1482633: test hangs on Python 3")
+    @testtools.skip("bug/1482633: test hangs on Python 3")
     @testtools.skip("using raw IPv6 addresses with SSL certs is broken")
     def test_app_using_ipv6_and_ssl(self):
         greetings = 'Hello, World!!!'

requirements.txt

@@ -11,7 +11,6 @@ oslo.utils>=3.40.2 # Apache-2.0
 oslo.concurrency>=3.25.0 # Apache-2.0
 oslo.config>=5.1.0 # Apache-2.0
 oslo.log>=3.36.0 # Apache-2.0
-six>=1.10.0 # MIT
 oslo.i18n>=3.15.3 # Apache-2.0
 PasteDeploy>=1.5.0 # MIT
 Routes>=2.3.1 # MIT