Update hacking for Python3

The repo is Python 3 now, so update hacking to version 3.0 which
supports Python 3.

Fix problems found.

Update local hacking checks for new flake8.

# to unbreak gate:
Depends-on: https://review.opendev.org/715835

Change-Id: Icc2f4368cc90689d74510ce36fe77d2346aec625

32 files changed, 124 insertions, 111 deletions

diff --git a/contrib/zoneextractor.py b/contrib/zoneextractor.py
index 48e4db5a..57068327 100644
--- a/contrib/zoneextractor.py
+++ b/contrib/zoneextractor.py
@@ -39,7 +39,7 @@ class Zone:
         self.to_file(sys.stdout)
 
     def to_file(self, f):
-        if type(f) is 'file':
+        if type(f) == 'file':
             fd = f
         elif type(f) is str:
             if os.path.isdir(f):
@@ -203,5 +203,6 @@ def main():
     except IOError as e:
         LOG.error(e)
 
+
 if __name__ == '__main__':
     sys.exit(main())
diff --git a/designate/api/v2/controllers/blacklists.py b/designate/api/v2/controllers/blacklists.py
index e01f86d3..9fa8b5d8 100644
--- a/designate/api/v2/controllers/blacklists.py
+++ b/designate/api/v2/controllers/blacklists.py
@@ -104,7 +104,7 @@ class BlacklistsController(rest.RestController):
         response = pecan.response
 
         if request.content_type == 'application/json-patch+json':
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
 
         # Fetch the existing blacklist entry
         blacklist = self.central_api.get_blacklist(context, blacklist_id)
diff --git a/designate/api/v2/controllers/pools.py b/designate/api/v2/controllers/pools.py
index e8d4c9b5..f5dd490e 100644
--- a/designate/api/v2/controllers/pools.py
+++ b/designate/api/v2/controllers/pools.py
@@ -108,7 +108,7 @@ class PoolsController(rest.RestController):
         response = pecan.response
 
         if request.content_type == 'application/json-patch+json':
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
 
         # Fetch the existing pool
         pool = self.central_api.get_pool(context, pool_id)
diff --git a/designate/api/v2/controllers/tlds.py b/designate/api/v2/controllers/tlds.py
index 3d54dbc3..9749e948 100644
--- a/designate/api/v2/controllers/tlds.py
+++ b/designate/api/v2/controllers/tlds.py
@@ -98,7 +98,7 @@ class TldsController(rest.RestController):
         body = request.body_dict
         response = pecan.response
         if request.content_type == 'application/json-patch+json':
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
 
         # Fetch the existing tld
         tld = self.central_api.get_tld(context, tld_id)
diff --git a/designate/api/v2/controllers/tsigkeys.py b/designate/api/v2/controllers/tsigkeys.py
index 516bd166..90451a93 100644
--- a/designate/api/v2/controllers/tsigkeys.py
+++ b/designate/api/v2/controllers/tsigkeys.py
@@ -100,7 +100,7 @@ class TsigKeysController(rest.RestController):
         response = pecan.response
 
         if request.content_type == 'application/json-patch+json':
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
 
         # Fetch the existing tsigkey entry
         tsigkey = self.central_api.get_tsigkey(context, tsigkey_id)
diff --git a/designate/api/v2/controllers/zones/__init__.py b/designate/api/v2/controllers/zones/__init__.py
index c2eb7178..1f5a6f5d 100644
--- a/designate/api/v2/controllers/zones/__init__.py
+++ b/designate/api/v2/controllers/zones/__init__.py
@@ -155,7 +155,7 @@ class ZonesController(rest.RestController):
             # 1) "Nested" resources? records inside a recordset.
             # 2) What to do when a zone doesn't exist in the first place?
             # 3) ...?
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
         else:
             # Update the zone object with the new values
             zone = DesignateAdapter.parse('API_v2', body, zone)
diff --git a/designate/api/v2/controllers/zones/tasks/transfer_requests.py b/designate/api/v2/controllers/zones/tasks/transfer_requests.py
index 6fc396c2..a6b24458 100644
--- a/designate/api/v2/controllers/zones/tasks/transfer_requests.py
+++ b/designate/api/v2/controllers/zones/tasks/transfer_requests.py
@@ -121,7 +121,7 @@ class TransferRequestsController(rest.RestController):
         response = pecan.response
 
         if request.content_type == 'application/json-patch+json':
-            raise NotImplemented('json-patch not implemented')
+            raise NotImplementedError('json-patch not implemented')
 
         # Fetch the existing zone_transfer_request
         zone_transfer_request = self.central_api.get_zone_transfer_request(
diff --git a/designate/backend/agent_backend/impl_gdnsd.py b/designate/backend/agent_backend/impl_gdnsd.py
index d25d8cc4..0e093215 100644
--- a/designate/backend/agent_backend/impl_gdnsd.py
+++ b/designate/backend/agent_backend/impl_gdnsd.py
@@ -149,7 +149,7 @@ class GdnsdBackend(base.AgentBackend):
     def _generate_zone_filename(self, zone_name):
         """Generate a filename for a zone file
         "/" is traslated into "@"
-        Non-valid characters are translated into \ NNN
+        Non-valid characters are translated into \\ NNN
         where NNN is a decimal integer in the range 0 - 255
         The filename is lowercase
 
diff --git a/designate/backend/agent_backend/impl_knot2.py b/designate/backend/agent_backend/impl_knot2.py
index 06010bb5..d474ec2f 100755
--- a/designate/backend/agent_backend/impl_knot2.py
+++ b/designate/backend/agent_backend/impl_knot2.py
@@ -160,7 +160,7 @@ class Knot2Backend(base.AgentBackend):
         try:
             serial = out.split('|')[1].split()[1]
             return int(serial)
-        except Exception as e:
+        except Exception:
             LOG.error("Unable to parse knotc output: %r", out)
             raise exceptions.Backend("Unexpected knotc zone-status output")
 
diff --git a/designate/backend/impl_nsd4.py b/designate/backend/impl_nsd4.py
index 9b97d1bf..9199f41d 100644
--- a/designate/backend/impl_nsd4.py
+++ b/designate/backend/impl_nsd4.py
@@ -52,17 +52,17 @@ class NSD4Backend(base.Backend):
         self.pattern = self.options.get('pattern', 'slave')
 
     def _command(self, command):
-            sock = eventlet.wrap_ssl(
-                eventlet.connect((self.host, self.port)),
-                keyfile=self.keyfile,
-                certfile=self.certfile)
-            stream = sock.makefile()
-            stream.write('%s %s\n' % (self.NSDCT_VERSION, command))
-            stream.flush()
-            result = stream.read()
-            stream.close()
-            sock.close()
-            return result
+        sock = eventlet.wrap_ssl(
+            eventlet.connect((self.host, self.port)),
+            keyfile=self.keyfile,
+            certfile=self.certfile)
+        stream = sock.makefile()
+        stream.write('%s %s\n' % (self.NSDCT_VERSION, command))
+        stream.flush()
+        result = stream.read()
+        stream.close()
+        sock.close()
+        return result
 
     def _execute_nsd4(self, command):
         try:
diff --git a/designate/backend/impl_pdns4.py b/designate/backend/impl_pdns4.py
index 576dddd5..c2e92ddb 100644
--- a/designate/backend/impl_pdns4.py
+++ b/designate/backend/impl_pdns4.py
@@ -50,7 +50,7 @@ class PDNS4Backend(base.Backend):
             self._build_url(zone=zone.name),
             headers=self.headers,
         )
-        return zone.status_code is 200
+        return zone.status_code == 200
 
     def create_zone(self, context, zone):
         """Create a DNS zone"""
diff --git a/designate/hacking/checks.py b/designate/hacking/checks.py
index e2bf40ed..0fd052eb 100644
--- a/designate/hacking/checks.py
+++ b/designate/hacking/checks.py
@@ -14,6 +14,7 @@
 # under the License.
 import re
 
+from hacking import core
 import pycodestyle
 
 # D701: Default parameter value is a mutable type
@@ -34,17 +35,18 @@ mutable_default_argument_check = re.compile(
 string_translation = re.compile(r"[^_]*_\(\s*('|\")")
 translated_log = re.compile(
     r"(.)*LOG\.(audit|error|info|warn|warning|critical|exception)"
-    "\(\s*_\(\s*('|\")")
+    r"\(\s*_\(\s*('|\")")
 underscore_import_check = re.compile(r"(.)*import _(.)*")
 # We need this for cases where they have created their own _ function.
 custom_underscore_check = re.compile(r"(.)*_\s*=\s*(.)*")
 graduated_oslo_libraries_import_re = re.compile(
     r"^\s*(?:import|from) designate\.openstack\.common\.?.*?"
-    "(gettextutils|rpc)"
-    ".*?")
+    r"(gettextutils|rpc)"
+    r".*?")
 
 
-def mutable_default_arguments(logical_line, physical_line, filename):
+@core.flake8ext
+def mutable_default_arguments(physical_line, logical_line, filename):
     if pycodestyle.noqa(physical_line):
         return
 
@@ -52,6 +54,7 @@ def mutable_default_arguments(logical_line, physical_line, filename):
         yield (0, "D701: Default parameter value is a mutable type")
 
 
+@core.flake8ext
 def no_translate_debug_logs(logical_line, filename):
     """Check for 'LOG.debug(_('
     As per our translation policy,
@@ -66,6 +69,7 @@ def no_translate_debug_logs(logical_line, filename):
         yield(0, "D706: Don't translate debug level logs")
 
 
+@core.flake8ext
 def check_explicit_underscore_import(logical_line, filename):
     """Check for explicit import of the _ function
 
@@ -86,6 +90,7 @@ def check_explicit_underscore_import(logical_line, filename):
         yield(0, "D703: Found use of _() without explicit import of _!")
 
 
+@core.flake8ext
 def no_import_graduated_oslo_libraries(logical_line, filename):
     """Check that we don't continue to use o.c. oslo libraries after graduation
 
@@ -105,6 +110,7 @@ def no_import_graduated_oslo_libraries(logical_line, filename):
                  "graduated!" % matches.group(1))
 
 
+@core.flake8ext
 def use_timeutils_utcnow(logical_line, filename):
     # tools are OK to use the standard datetime module
     if "/tools/" in filename:
@@ -119,6 +125,7 @@ def use_timeutils_utcnow(logical_line, filename):
             yield (pos, msg % f)
 
 
+@core.flake8ext
 def check_no_basestring(logical_line):
     if re.search(r"\bbasestring\b", logical_line):
         msg = ("D707: basestring is not Python3-compatible, use "
@@ -126,12 +133,14 @@ def check_no_basestring(logical_line):
         yield(0, msg)
 
 
+@core.flake8ext
 def check_python3_xrange(logical_line):
     if re.search(r"\bxrange\s*\(", logical_line):
         yield(0, "D708: Do not use xrange. Use range, or six.moves.range for "
                  "large loops.")
 
 
+@core.flake8ext
 def check_no_log_audit(logical_line):
     """Ensure that we are not using LOG.audit messages
     Plans are in place going forward as discussed in the following
@@ -141,14 +150,3 @@ def check_no_log_audit(logical_line):
     """
     if "LOG.audit(" in logical_line:
         yield(0, "D709: LOG.audit is deprecated, please use LOG.info!")
-
-
-def factory(register):
-    register(mutable_default_arguments)
-    register(no_translate_debug_logs)
-    register(check_explicit_underscore_import)
-    register(no_import_graduated_oslo_libraries)
-    register(use_timeutils_utcnow)
-    register(check_no_basestring)
-    register(check_python3_xrange)
-    register(check_no_log_audit)
diff --git a/designate/hookpoints.py b/designate/hookpoints.py
index 5403ddaf..5185da59 100644
--- a/designate/hookpoints.py
+++ b/designate/hookpoints.py
@@ -52,6 +52,7 @@ class HookLog(object):
         if name in self.LVLS:
             return functools.partial(self.capture, self.LVLS[name])
 
+
 LOG = HookLog()
 
 
diff --git a/designate/objects/adapters/api_v2/validation_error.py b/designate/objects/adapters/api_v2/validation_error.py
index ceb9f343..54665340 100644
--- a/designate/objects/adapters/api_v2/validation_error.py
+++ b/designate/objects/adapters/api_v2/validation_error.py
@@ -20,7 +20,8 @@ from designate import objects
 class NotSpecifiedSential:
     pass
 
-REQUIRED_RE = re.compile("\'([\w]*)\' is a required property")
+
+REQUIRED_RE = re.compile(r"\'([\w]*)\' is a required property")
 
 
 class ValidationErrorAPIv2Adapter(base.APIv2Adapter):
diff --git a/designate/objects/adapters/api_v2/zone_master.py b/designate/objects/adapters/api_v2/zone_master.py
index 856f6ef3..d2b865b4 100644
--- a/designate/objects/adapters/api_v2/zone_master.py
+++ b/designate/objects/adapters/api_v2/zone_master.py
@@ -36,7 +36,7 @@ class ZoneMasterAPIv2Adapter(base.APIv2Adapter):
 
     @classmethod
     def _render_object(cls, object, *arg, **kwargs):
-        if object.port is 53:
+        if object.port == 53:
             return object.host
         else:
             return "%(host)s:%(port)d" % object.to_dict()
diff --git a/designate/objects/base.py b/designate/objects/base.py
index bc3fb72b..c8e0e76b 100644
--- a/designate/objects/base.py
+++ b/designate/objects/base.py
@@ -288,7 +288,7 @@ class DesignateObject(base.VersionedObject):
                 else:
                     try:
                         field.coerce(self, name, value)  # Check value
-                    except Exception as e:
+                    except Exception:
                         raise exceptions.InvalidObject(
                             "{} is invalid".format(name))
             elif not field.nullable:
diff --git a/designate/objects/recordset.py b/designate/objects/recordset.py
index 2011c735..86b2bfa8 100755
--- a/designate/objects/recordset.py
+++ b/designate/objects/recordset.py
@@ -121,7 +121,7 @@ class RecordSet(base.DesignateObject, base.DictObjectMixin,
         try:
             record_list_cls = self.obj_cls_from_name('%sList' % self.type)
             record_cls = self.obj_cls_from_name(self.type)
-        except (KeyError, ovo_exc.UnsupportedObjectError) as e:
+        except (KeyError, ovo_exc.UnsupportedObjectError):
             err_msg = ("'%(type)s' is not a valid record type"
                        % {'type': self.type})
             self._validate_fail(errors, err_msg)
diff --git a/designate/scheduler/base.py b/designate/scheduler/base.py
index 61a7e9b2..b288548d 100644
--- a/designate/scheduler/base.py
+++ b/designate/scheduler/base.py
@@ -61,7 +61,7 @@ class Scheduler(object):
         """
         pools = self.storage.find_pools(context)
 
-        if len(self.filters) is 0:
+        if len(self.filters) == 0:
             raise exceptions.NoFiltersConfigured('There are no scheduling '
                                                  'filters configured')
 
@@ -75,7 +75,7 @@ class Scheduler(object):
 
         if len(pools) > 1:
             raise exceptions.MultiplePoolsFound()
-        if len(pools) is 0:
+        if len(pools) == 0:
             raise exceptions.NoValidPoolFound('There are no pools that '
                                               'matched your request')
         return pools[0].id
diff --git a/designate/scheduler/filters/fallback_filter.py b/designate/scheduler/filters/fallback_filter.py
index 0c54820d..cbb31ac3 100644
--- a/designate/scheduler/filters/fallback_filter.py
+++ b/designate/scheduler/filters/fallback_filter.py
@@ -40,7 +40,7 @@ class FallbackFilter(base.Filter):
     """
 
     def filter(self, context, pools, zone):
-        if len(pools) is 0:
+        if len(pools) == 0:
             pools = objects.PoolList()
             pools.append(
                 objects.Pool(id=cfg.CONF['service:central'].default_pool_id))
diff --git a/designate/schema/__init__.py b/designate/schema/__init__.py
index 07eb56a6..ae893634 100644
--- a/designate/schema/__init__.py
+++ b/designate/schema/__init__.py
@@ -108,7 +108,7 @@ class Schema(object):
             schema = schema['properties']
 
             with self.resolver.resolving(schema['$ref']) as ischema:
-                    schema = ischema
+                schema = ischema
 
             return [self.filter(i, schema) for i in instance]
 
diff --git a/designate/schema/_validators.py b/designate/schema/_validators.py
index 8180a086..948fb48c 100644
--- a/designate/schema/_validators.py
+++ b/designate/schema/_validators.py
@@ -46,25 +46,25 @@ def type_draft3(validator, types, instance, schema):
 
 
 def oneOf_draft3(validator, oneOf, instance, schema):
-        # Backported from Draft4 to Draft3
-        subschemas = iter(oneOf)
-        first_valid = next(
-            (s for s in subschemas if validator.is_valid(instance, s)), None,
-        )
+    # Backported from Draft4 to Draft3
+    subschemas = iter(oneOf)
+    first_valid = next(
+        (s for s in subschemas if validator.is_valid(instance, s)), None,
+    )
 
-        if first_valid is None:
+    if first_valid is None:
+        yield jsonschema.ValidationError(
+            "%r is not valid under any of the given schemas." % (instance,)
+        )
+    else:
+        more_valid = [s for s in subschemas
+                      if validator.is_valid(instance, s)]
+        if more_valid:
+            more_valid.append(first_valid)
+            reprs = ", ".join(repr(schema) for schema in more_valid)
             yield jsonschema.ValidationError(
-                "%r is not valid under any of the given schemas." % (instance,)
+                "%r is valid under each of %s" % (instance, reprs)
             )
-        else:
-            more_valid = [s for s in subschemas
-                          if validator.is_valid(instance, s)]
-            if more_valid:
-                more_valid.append(first_valid)
-                reprs = ", ".join(repr(schema) for schema in more_valid)
-                yield jsonschema.ValidationError(
-                    "%r is valid under each of %s" % (instance, reprs)
-                )
 
 
 def type_draft4(validator, types, instance, schema):
diff --git a/designate/sqlalchemy/base.py b/designate/sqlalchemy/base.py
index 2be6950d..a28a1ce0 100644
--- a/designate/sqlalchemy/base.py
+++ b/designate/sqlalchemy/base.py
@@ -49,18 +49,18 @@ def _set_object_from_model(obj, model, **extra):
 
 
 def _set_listobject_from_models(obj, models, map_=None):
-        for model in models:
-            extra = {}
+    for model in models:
+        extra = {}
 
-            if map_ is not None:
-                extra = map_(model)
+        if map_ is not None:
+            extra = map_(model)
 
-            obj.objects.append(
-                _set_object_from_model(obj.LIST_ITEM_TYPE(), model, **extra))
+        obj.objects.append(
+            _set_object_from_model(obj.LIST_ITEM_TYPE(), model, **extra))
 
-        obj.obj_reset_changes()
+    obj.obj_reset_changes()
 
-        return obj
+    return obj
 
 
 @six.add_metaclass(abc.ABCMeta)
diff --git a/designate/storage/impl_sqlalchemy/__init__.py b/designate/storage/impl_sqlalchemy/__init__.py
index 6a3fe7de..00e2575d 100644
--- a/designate/storage/impl_sqlalchemy/__init__.py
+++ b/designate/storage/impl_sqlalchemy/__init__.py
@@ -1798,5 +1798,5 @@ class SQLAlchemyStorage(sqlalchemy_base.SQLAlchemy, storage_base.Storage):
     def _rname_check(self, criterion):
         # If the criterion has 'name' in it, switch it out for reverse_name
         if criterion is not None and criterion.get('name', "").startswith('*'):
-                criterion['reverse_name'] = criterion.pop('name')[::-1]
+            criterion['reverse_name'] = criterion.pop('name')[::-1]
         return criterion
diff --git a/designate/tests/test_central/test_service.py b/designate/tests/test_central/test_service.py
index 10c25143..e5d72dcd 100644
--- a/designate/tests/test_central/test_service.py
+++ b/designate/tests/test_central/test_service.py
@@ -248,8 +248,8 @@ class CentralServiceTest(CentralTestCase):
         values['ttl'] = 0
 
         with testtools.ExpectedException(exceptions.InvalidTTL):
-                    self.central_service._is_valid_ttl(
-                        context, values['ttl'])
+            self.central_service._is_valid_ttl(
+                context, values['ttl'])
 
     # TLD Tests
     def test_create_tld(self):
@@ -721,8 +721,8 @@ class CentralServiceTest(CentralTestCase):
         values['ttl'] = 0
 
         with testtools.ExpectedException(ValueError):
-                    self.central_service.create_zone(
-                        context, objects.Zone.from_dict(values))
+            self.central_service.create_zone(
+                context, objects.Zone.from_dict(values))
 
     def test_create_zone_below_zero_ttl(self):
         self.policy({'use_low_ttl': '!'})
diff --git a/designate/tests/test_notification_handler/test_nova.py b/designate/tests/test_notification_handler/test_nova.py
index d91cc5ab..ad6fd6f0 100644
--- a/designate/tests/test_notification_handler/test_nova.py
+++ b/designate/tests/test_notification_handler/test_nova.py
@@ -148,15 +148,15 @@ class NovaFixedHandlerTest(TestCase, NotificationHandlerMixin):
         fixture = self.get_notification_fixture('nova', event_type)
         with mock.patch.object(
                 self.plugin, '_create_or_update_recordset') as finder:
-                with mock.patch.object(self.plugin.central_api,
-                                       'create_record'):
-                    finder.return_value = {'id': 'fakeid'}
-                    self.plugin.process_notification(
-                        self.admin_context.to_dict(),
-                        event_type, fixture['payload'])
-                    finder.assert_called_once_with(
-                        mock.ANY, mock.ANY, type='A', zone_id=self.zone_id,
-                        name='private.example.com.')
+            with mock.patch.object(self.plugin.central_api,
+                                   'create_record'):
+                finder.return_value = {'id': 'fakeid'}
+                self.plugin.process_notification(
+                    self.admin_context.to_dict(),
+                    event_type, fixture['payload'])
+                finder.assert_called_once_with(
+                    mock.ANY, mock.ANY, type='A', zone_id=self.zone_id,
+                    name='private.example.com.')
 
     def test_formatv4(self):
         event_type = 'compute.instance.create.end'
@@ -165,15 +165,15 @@ class NovaFixedHandlerTest(TestCase, NotificationHandlerMixin):
         fixture = self.get_notification_fixture('nova', event_type)
         with mock.patch.object(
                 self.plugin, '_create_or_update_recordset') as finder:
-                with mock.patch.object(self.plugin.central_api,
-                                       'create_record'):
-                    finder.return_value = {'id': 'fakeid'}
-                    self.plugin.process_notification(
-                        self.admin_context.to_dict(),
-                        event_type, fixture['payload'])
-                    finder.assert_called_once_with(
-                        mock.ANY, mock.ANY, type='A', zone_id=self.zone_id,
-                        name='private-v4.example.com.')
+            with mock.patch.object(self.plugin.central_api,
+                                   'create_record'):
+                finder.return_value = {'id': 'fakeid'}
+                self.plugin.process_notification(
+                    self.admin_context.to_dict(),
+                    event_type, fixture['payload'])
+                finder.assert_called_once_with(
+                    mock.ANY, mock.ANY, type='A', zone_id=self.zone_id,
+                    name='private-v4.example.com.')
 
     def test_formatv6(self):
         event_type = 'compute.instance.create.end'
@@ -182,12 +182,12 @@ class NovaFixedHandlerTest(TestCase, NotificationHandlerMixin):
         fixture = self.get_notification_fixture('nova', event_type)
         with mock.patch.object(
                 self.plugin, '_create_or_update_recordset') as finder:
-                with mock.patch.object(self.plugin.central_api,
-                                       'create_record'):
-                    finder.return_value = {'id': 'fakeid'}
-                    self.plugin.process_notification(
-                        self.admin_context.to_dict(),
-                        event_type, fixture['payload_v6'])
-                    finder.assert_called_once_with(
-                        mock.ANY, mock.ANY, type='AAAA', zone_id=self.zone_id,
-                        name='private-v6.example.com.')
+            with mock.patch.object(self.plugin.central_api,
+                                   'create_record'):
+                finder.return_value = {'id': 'fakeid'}
+                self.plugin.process_notification(
+                    self.admin_context.to_dict(),
+                    event_type, fixture['payload_v6'])
+                finder.assert_called_once_with(
+                    mock.ANY, mock.ANY, type='AAAA', zone_id=self.zone_id,
+                    name='private-v6.example.com.')
diff --git a/designate/tests/unit/backend/test_nsd4.py b/designate/tests/unit/backend/test_nsd4.py
index bfc087ee..d20154dd 100644
--- a/designate/tests/unit/backend/test_nsd4.py
+++ b/designate/tests/unit/backend/test_nsd4.py
@@ -67,18 +67,18 @@ class NSD4BackendTestCase(designate.tests.TestCase):
         mock_connect.return_value = mock.sentinel.client
         mock_ssl.return_value = sock
         sock.makefile.return_value = stream
-        if command_context is 'create_fail':
+        if command_context == 'create_fail':
             stream.read.return_value = 'goat'
         else:
             stream.read.return_value = 'ok'
 
-        if command_context is 'create':
+        if command_context == 'create':
             self.backend.create_zone(self.context, self.zone)
             command = 'NSDCT1 addzone %s test-pattern\n' % self.zone.name
-        elif command_context is 'delete':
+        elif command_context == 'delete':
             self.backend.delete_zone(self.context, self.zone)
             command = 'NSDCT1 delzone %s\n' % self.zone.name
-        elif command_context is 'create_fail':
+        elif command_context == 'create_fail':
             self.assertRaises(exceptions.Backend,
                               self.backend.create_zone,
                               self.context, self.zone)
diff --git a/designate/tests/unit/test_central/test_basic.py b/designate/tests/unit/test_central/test_basic.py
index ba20121a..951df6cd 100644
--- a/designate/tests/unit/test_central/test_basic.py
+++ b/designate/tests/unit/test_central/test_basic.py
@@ -198,8 +198,8 @@ class MockRecord(object):
 class MockPool(object):
     ns_records = [MockRecord(), ]
 
-# Fixtures
 
+# Fixtures
 fx_mdns_api = fixtures.MockPatch('designate.central.service.mdns_rpcapi')
 
 mdns_api = mock.PropertyMock(
diff --git a/designate/tests/unit/test_dnsutils.py b/designate/tests/unit/test_dnsutils.py
index 7bf68b82..a23c409e 100644
--- a/designate/tests/unit/test_dnsutils.py
+++ b/designate/tests/unit/test_dnsutils.py
@@ -243,7 +243,7 @@ class TestDoAfxr(oslotest.base.BaseTestCase):
 
         self.assertRaisesRegex(
             exceptions.XFRFailure,
-            'XFR failed for example.com. No servers in \[\] was reached.',
+            r'XFR failed for example.com. No servers in \[\] was reached.',
             dnsutils.do_axfr, 'example.com', masters,
         )
 
diff --git a/designate/utils.py b/designate/utils.py
index e339bb9d..10a96c1c 100644
--- a/designate/utils.py
+++ b/designate/utils.py
@@ -158,7 +158,7 @@ def deep_dict_merge(a, b):
 
     for k, v in b.items():
         if k in result and isinstance(result[k], dict):
-                result[k] = deep_dict_merge(result[k], v)
+            result[k] = deep_dict_merge(result[k], v)
         else:
             result[k] = copy.deepcopy(v)
 
diff --git a/devstack/statsd_mock_server.py b/devstack/statsd_mock_server.py
index 2b195d9b..62c8cb2f 100755
--- a/devstack/statsd_mock_server.py
+++ b/devstack/statsd_mock_server.py
@@ -57,5 +57,6 @@ def main():
     )
     server.serve_forever()
 
+
 if __name__ == "__main__":
     sys.exit(main())
diff --git a/test-requirements.txt b/test-requirements.txt
index 40ba58c7..9d969c82 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -3,7 +3,7 @@
 # process, which may cause wedges in the gate later.
 
 # Hacking already pins down pep8, pyflakes and flake8
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
diff --git a/tox.ini b/tox.ini
index daf3b6ab..aaa385e2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -173,14 +173,25 @@ ignore-path = .venv,.git,.tox,*designate/locale*,*lib/python*,*designate.egg*,ap
 # H904 Wrap long lines in parentheses instead of a backslash
 # E126 continuation line over-indented for hanging indent
 # E128 continuation line under-indented for visual indent
-
-ignore = H105,H302,H306,H238,H402,H404,H405,H501,H904,E126,E128
+# W504 line break after binary operator
+ignore = H105,H302,H306,H238,H402,H404,H405,H501,H904,E126,E128,W504
 exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,.ropeproject
 
 [hacking]
-local-check-factory = designate.hacking.checks.factory
 import_exceptions = designate.i18n
 
+[flake8:local-plugins]
+extension =
+  D701 = checks:mutable_default_arguments
+  D703 = checks:check_explicit_underscore_import
+  D704 = checks:no_import_graduated_oslo_libraries
+  D705 = checks:use_timeutils_utcnow
+  D706 = checks:no_translate_debug_logs
+  D707 = checks:check_no_basestring
+  D708 = checks:check_python3_xrange
+  D709 = checks:check_no_log_audit
+paths = ./designate/hacking
+
 [testenv:lower-constraints]
 deps =
   -c{toxinidir}/lower-constraints.txt