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.

Remove hacking and friends from lower-constraints, they are not needed
to be installed at run-time.

Change-Id: Ia6af344ec8441dc98a0820176373dcff3a8c80d5

lower-constraints.txt

@@ -30,7 +30,6 @@ eventlet==0.20.0
 extras==1.0.0
 fasteners==0.14.1
 fixtures==3.0.0
-flake8==2.5.5
 freezegun==0.3.10
 future==0.16.0
 futurist==1.8.0
@@ -38,7 +37,6 @@ gitdb2==2.0.3
 GitPython==2.1.8
 gnocchiclient==7.0.1
 greenlet==0.4.13
-hacking==0.12.0
 idna==2.6
 imagesize==1.0.0
 iso8601==0.1.12
@@ -95,14 +93,12 @@ Paste==2.0.3
 PasteDeploy==1.5.2
 pbr==3.1.1
 pecan==1.3.2
-pep8==1.5.7
 pika==0.10.0
 pika-pool==0.1.3
 prettytable==0.7.2
 psutil==5.4.3
 pycadf==2.7.0
 pycparser==2.18
-pyflakes==0.8.1
 Pygments==2.2.0
 pyinotify==0.9.6
 pyOpenSSL==17.5.0

test-requirements.txt

@@ -5,7 +5,7 @@
 coverage>=4.5.1 # Apache-2.0
 doc8>=0.8.0 # Apache-2.0
 freezegun>=0.3.10 # Apache-2.0
-hacking>=1.1.0,<1.2.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 mock>=2.0.0 # BSD
 oslotest>=3.3.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0

tox.ini

@@ -75,7 +75,8 @@ commands =
 [flake8]
 filename = *.py,app.wsgi
 show-source=True
-ignore= H105,E123,E226,N320,H202
+# W504 line break after binary operator
+ignore= H105,E123,E226,N320,H202,W504
 builtins= _
 enable-extensions = H106,H203,H904
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,*sqlalchemy/alembic/versions/*,demo/,releasenotes
@@ -85,7 +86,26 @@ commands = python setup.py bdist_wheel
 
 [hacking]
 import_exceptions = watcher._i18n
-local-check-factory = watcher.hacking.checks.factory
+
+[flake8:local-plugins]
+extension =
+   N319 = checks:no_translate_debug_logs
+   N321 = checks:use_jsonutils
+   N322 = checks:check_assert_called_once_with
+   N325 = checks:check_python3_xrange
+   N326 = checks:check_no_basestring
+   N327 = checks:check_python3_no_iteritems
+   N328 = checks:check_asserttrue
+   N329 = checks:check_assertfalse
+   N330 = checks:check_assertempty
+   N331 = checks:check_assertisinstance
+   N332 = checks:check_assertequal_for_httpcode
+   N333 = checks:check_log_warn_deprecated
+   N340 = checks:check_oslo_i18n_wrapper
+   N341 = checks:check_builtins_gettext
+   N342 = checks:no_redundant_import_alias
+paths = ./watcher/hacking
+
 
 [doc8]
 extension=.rst

watcher/api/controllers/v1/types.py

@@ -184,7 +184,7 @@ class MultiType(wtypes.UserType):
 class JsonPatchType(wtypes.Base):
     """A complex type that represents a single json-patch operation."""
 
-    path = wtypes.wsattr(wtypes.StringType(pattern='^(/[\w-]+)+$'),
+    path = wtypes.wsattr(wtypes.StringType(pattern=r'^(/[\w-]+)+$'),
                          mandatory=True)
     op = wtypes.wsattr(wtypes.Enum(str, 'add', 'replace', 'remove'),
                        mandatory=True)

watcher/api/controllers/v1/versions.py

@@ -25,6 +25,7 @@ class VERSIONS(enum.Enum):
     MINOR_4_WEBHOOK_API = 4  # v1.4: Add webhook trigger API
     MINOR_MAX_VERSION = 4
 
+
 # This is the version 1 API
 BASE_VERSION = 1
 # String representations of the minor and maximum versions

watcher/api/middleware/auth_token.py

@@ -34,7 +34,7 @@ class AuthTokenMiddleware(auth_token.AuthProtocol):
 
     """
     def __init__(self, app, conf, public_api_routes=()):
-        route_pattern_tpl = '%s(\.json|\.xml)?$'
+        route_pattern_tpl = r'%s(\.json|\.xml)?$'
 
         try:
             self.public_api_routes = [re.compile(route_pattern_tpl % route_tpl)

watcher/applier/actions/base.py

@@ -140,7 +140,7 @@ class BaseAction(loadable.Loadable):
         raise NotImplementedError()
 
     def check_abort(self):
-        if self.__class__.__name__ is 'Migrate':
+        if self.__class__.__name__ == 'Migrate':
             if self.migration_type == self.LIVE_MIGRATION:
                 return True
             else:

watcher/applier/workflow_engine/default.py

@@ -112,7 +112,7 @@ class DefaultWorkFlowEngine(base.BaseWorkFlowEngine):
 
             return flow
 
-        except exception.ActionPlanCancelled as e:
+        except exception.ActionPlanCancelled:
             raise
 
         except tf_exception.WrappedFailure as e:

watcher/common/scheduling.py

@@ -37,6 +37,7 @@ class GreenThreadPoolExecutor(BasePoolExecutor):
         pool = futurist.GreenThreadPoolExecutor(int(max_workers))
         super(GreenThreadPoolExecutor, self).__init__(pool)
 
+
 executors = {
     'default': GreenThreadPoolExecutor(),
 }

watcher/common/utils.py

@@ -153,6 +153,7 @@ def extend_with_strict_schema(validator_class):
 
     return validators.extend(validator_class, {"properties": strict_schema})
 
+
 StrictDefaultValidatingDraft4Validator = extend_with_default(
     extend_with_strict_schema(validators.Draft4Validator))
 

watcher/decision_engine/datasources/ceilometer.py

@@ -188,7 +188,7 @@ class CeilometerHelper(base.DataSourceBase):
         item_value = None
         if statistic:
             item_value = statistic[-1]._info.get('aggregate').get(aggregate)
-            if meter_name is 'host_airflow':
+            if meter_name == 'host_airflow':
                 # Airflow from hardware.ipmi.node.airflow is reported as
                 # 1/10 th of actual CFM
                 item_value *= 10

watcher/decision_engine/datasources/gnocchi.py

@@ -116,7 +116,7 @@ class GnocchiHelper(base.DataSourceBase):
             # measure has structure [time, granularity, value]
             return_value = statistics[-1][2]
 
-            if meter_name is 'host_airflow':
+            if meter_name == 'host_airflow':
                 # Airflow from hardware.ipmi.node.airflow is reported as
                 # 1/10 th of actual CFM
                 return_value *= 10

watcher/decision_engine/datasources/grafana.py

@@ -72,7 +72,7 @@ class GrafanaHelper(base.DataSourceBase):
 
         # Very basic url parsing
         parse = urlparse.urlparse(self._base_url)
-        if parse.scheme is '' or parse.netloc is '' or parse.path is '':
+        if parse.scheme == '' or parse.netloc == '' or parse.path == '':
             LOG.critical("GrafanaHelper url not properly configured, "
                          "check base_url and project_id")
             return

watcher/decision_engine/datasources/manager.py

@@ -112,10 +112,10 @@ class DataSourceManager(object):
         datasource is attempted.
         """
 
-        if not self.datasources or len(self.datasources) is 0:
+        if not self.datasources or len(self.datasources) == 0:
             raise exception.NoDatasourceAvailable
 
-        if not metrics or len(metrics) is 0:
+        if not metrics or len(metrics) == 0:
             LOG.critical("Can not retrieve datasource without specifying "
                          "list of required metrics.")
             raise exception.InvalidParameter(parameter='metrics',

watcher/decision_engine/strategy/strategies/basic_consolidation.py

@@ -401,7 +401,7 @@ class BasicConsolidation(base.ServerConsolidationBaseStrategy):
         self._pre_execute()
 
         # backwards compatibility for node parameter.
-        if self.aggregation_method['node'] is not '':
+        if self.aggregation_method['node'] != '':
             LOG.warning('Parameter node has been renamed to compute_node and '
                         'will be removed in next release.')
             self.aggregation_method['compute_node'] = \

watcher/decision_engine/strategy/strategies/workload_stabilization.py

@@ -514,7 +514,7 @@ class WorkloadStabilization(base.WorkloadStabilizationBaseStrategy):
                 self.aggregation_method['node']
 
         # backwards compatibility for node parameter with period.
-        if self.periods['node'] is not 0:
+        if self.periods['node'] != 0:
             LOG.warning('Parameter node has been renamed to compute_node and '
                         'will be removed in next release.')
             self.periods['compute_node'] = self.periods['node']

watcher/hacking/checks.py

@@ -23,6 +23,8 @@ def flake8ext(f):
     only for unit tests to know which are watcher flake8 extensions.
     """
     f.name = __name__
+    f.version = '0.0.1'
+    f.skip_on_py3 = False
     return f
 
 
@@ -162,11 +164,11 @@ def check_asserttrue(logical_line, filename):
 def check_assertfalse(logical_line, filename):
     if 'watcher/tests/' in filename:
         if re.search(r"assertEqual\(\s*False,[^,]*(,[^,]*)?\)", logical_line):
-            msg = ("N328: Use assertFalse(observed) instead of "
+            msg = ("N329: Use assertFalse(observed) instead of "
                    "assertEqual(False, observed)")
             yield (0, msg)
         if re.search(r"assertEqual\([^,]*,\s*False(,[^,]*)?\)", logical_line):
-            msg = ("N328: Use assertFalse(observed) instead of "
+            msg = ("N329: Use assertFalse(observed) instead of "
                    "assertEqual(False, observed)")
             yield (0, msg)
 
@@ -283,21 +285,3 @@ def no_redundant_import_alias(logical_line):
     """
     if re.match(re_redundant_import_alias, logical_line):
         yield(0, "N342: No redundant import alias.")
-
-
-def factory(register):
-    register(use_jsonutils)
-    register(check_assert_called_once_with)
-    register(no_translate_debug_logs)
-    register(check_python3_xrange)
-    register(check_no_basestring)
-    register(check_python3_no_iteritems)
-    register(check_asserttrue)
-    register(check_assertfalse)
-    register(check_assertempty)
-    register(check_assertisinstance)
-    register(check_assertequal_for_httpcode)
-    register(check_log_warn_deprecated)
-    register(check_oslo_i18n_wrapper)
-    register(check_builtins_gettext)
-    register(no_redundant_import_alias)