Remove six of dir cinder/scheduler/*

Replace the following items with Python 3 style code.

- six.add_metaclass
- six.string_types
- six.text_type
- six.wraps

Change-Id: I1a1d9bf7e26e436bc93fe0091ecaae8ca5593c42
Implements: blueprint six-removal

cinder/scheduler/base_weight.py

@@ -20,7 +20,6 @@ Pluggable Weighing support
 import abc
 
 from oslo_log import log as logging
-import six
 
 from cinder.scheduler import base_handler
 
@@ -67,8 +66,7 @@ class WeighedObject(object):
         return "<WeighedObject '%s': %s>" % (self.obj, self.weight)
 
 
-@six.add_metaclass(abc.ABCMeta)
+class BaseWeigher(object, metaclass=abc.ABCMeta):
-class BaseWeigher(object):
     """Base class for pluggable weighers.
 
     The attributes maxval and minval can be specified to set up the maximum

cinder/scheduler/evaluator/evaluator.py

@@ -17,7 +17,6 @@ import operator
 import re
 
 import pyparsing
-import six
 
 from cinder import exception
 from cinder.i18n import _
@@ -40,7 +39,7 @@ class EvalConstant(object):
 
     def eval(self):
         result = self.value
-        if (isinstance(result, six.string_types) and
+        if (isinstance(result, str) and
                 re.match(r"^[a-zA-Z_]+\.[a-zA-Z_]+$", result)):
             (which_dict, entry) = result.split('.')
             try:

cinder/scheduler/filters/driver_filter.py

@@ -14,7 +14,6 @@
 #    under the License.
 
 from oslo_log import log as logging
-import six
 
 from cinder.scheduler.evaluator import evaluator
 from cinder.scheduler import filters
@@ -120,7 +119,7 @@ class DriverFilter(filters.BaseBackendFilter):
 
         if ('filter_function' in backend_caps and
                 backend_caps['filter_function'] is not None):
-            filter_function = six.text_type(backend_caps['filter_function'])
+            filter_function = str(backend_caps['filter_function'])
 
         qos_specs = filter_properties.get('qos_specs', {})
 

cinder/scheduler/filters/json_filter.py

@@ -16,7 +16,6 @@
 import operator
 
 from oslo_serialization import jsonutils
-import six
 
 from cinder.scheduler import filters
 
@@ -127,7 +126,7 @@ class JsonFilter(filters.BaseBackendFilter):
         for arg in query[1:]:
             if isinstance(arg, list):
                 arg = self._process_filter(arg, backend_state)
-            elif isinstance(arg, six.string_types):
+            elif isinstance(arg, str):
                 arg = self._parse_string(arg, backend_state)
             if arg is not None:
                 cooked_args.append(arg)

cinder/scheduler/manager.py

@@ -21,6 +21,7 @@ Scheduler Service
 
 import collections
 from datetime import datetime
+import functools
 
 import eventlet
 from oslo_config import cfg
@@ -31,7 +32,6 @@ from oslo_utils import excutils
 from oslo_utils import importutils
 from oslo_utils import timeutils
 from oslo_utils import versionutils
-import six
 
 from cinder.backup import rpcapi as backup_rpcapi
 from cinder import context
@@ -74,7 +74,7 @@ LOG = logging.getLogger(__name__)
 
 def append_operation_type(name=None):
     def _decorator(schedule_function):
-        @six.wraps(schedule_function)
+        @functools.wraps(schedule_function)
         def inject_operation_decorator(*args, **kwargs):
 
             request_spec = kwargs.get('request_spec', None)
@@ -485,7 +485,7 @@ class SchedulerManager(manager.CleanableManager, manager.Manager):
         # TODO(harlowja): move into a task that just does this later.
         if not msg:
             msg = ("Failed to schedule_%(method)s: %(ex)s" %
-                   {'method': method, 'ex': six.text_type(ex)})
+                   {'method': method, 'ex': ex})
         LOG.error(msg)
 
         volume_state = updates['volume_state']
@@ -515,7 +515,7 @@ class SchedulerManager(manager.CleanableManager, manager.Manager):
                                        msg=None):
         if not msg:
             msg = ("Failed to schedule_%(method)s: %(ex)s" %
-                   {'method': method, 'ex': six.text_type(ex)})
+                   {'method': method, 'ex': ex})
         LOG.error(msg)
 
         model_update = dict(status=state)

cinder/scheduler/weights/goodness.py

@@ -13,7 +13,6 @@
 # under the License.
 
 from oslo_log import log as logging
-import six
 
 from cinder.scheduler.evaluator import evaluator
 from cinder.scheduler import weights
@@ -124,7 +123,7 @@ class GoodnessWeigher(weights.BaseHostWeigher):
 
         if ('goodness_function' in host_caps and
                 host_caps['goodness_function'] is not None):
-            goodness_function = six.text_type(host_caps['goodness_function'])
+            goodness_function = str(host_caps['goodness_function'])
 
         qos_specs = weight_properties.get('qos_specs', {}) or {}