Use hacking for pep8 tests

Enforce flake8 checks based on Openstack StyleGuide using the
hacking module.
Also enforce check for pep8 module import style.

Change-Id: I1ff39f402d12e2c921705d265dcae5b6c5f70aa3

ironic_prometheus_exporter/app/exporter.py

@@ -14,7 +14,11 @@ import configparser
 import logging
 import os
 
-from flask import abort, Flask, Response
+from flask import abort
+from flask import Flask
+from flask import Response
+
+
 application = Flask(__name__)
 LOG = logging.getLogger(__name__)
 

ironic_prometheus_exporter/messaging.py

@@ -13,12 +13,15 @@
 import logging
 import os
 
-from ironic_prometheus_exporter.parsers import ipmi
-from ironic_prometheus_exporter.parsers import header
-from ironic_prometheus_exporter.parsers import redfish
 from oslo_config import cfg
 from oslo_messaging.notify import notifier
-from prometheus_client import write_to_textfile, CollectorRegistry
+from prometheus_client import CollectorRegistry
+from prometheus_client import write_to_textfile
+
+from ironic_prometheus_exporter.parsers import header
+from ironic_prometheus_exporter.parsers import ipmi
+from ironic_prometheus_exporter.parsers import redfish
+
 
 LOG = logging.getLogger(__name__)
 

ironic_prometheus_exporter/parsers/descriptions.py

@@ -14,6 +14,7 @@
 import json
 import logging
 import os
+
 import pkg_resources
 
 DESCRIPTIONS = {}

ironic_prometheus_exporter/parsers/header.py

@@ -14,8 +14,8 @@ from datetime import datetime
 
 from prometheus_client import Gauge
 
-from ironic_prometheus_exporter import utils as ipe_utils
 from ironic_prometheus_exporter.parsers import descriptions
+from ironic_prometheus_exporter import utils as ipe_utils
 
 
 def timestamp_registry(node_information, ipmi_metric_registry):

ironic_prometheus_exporter/parsers/ipmi.py

@@ -12,13 +12,13 @@
 
 import json
 import logging
-import pkg_resources
 import re
 
+import pkg_resources
 from prometheus_client import Gauge
 
-from ironic_prometheus_exporter import utils as ipe_utils
 from ironic_prometheus_exporter.parsers import descriptions
+from ironic_prometheus_exporter import utils as ipe_utils
 
 
 # NOTE (iurygregory): most of the sensor readings come in the ipmi format
@@ -140,7 +140,7 @@ def metric_names(category_info):
 
 
 def extract_labels(entries, category_info):
-    """ This function extract the labels to be used by a metric
+    """This function extract the labels to be used by a metric
 
     If a metric has many entries we add the 'Sensor ID' information as label
     otherwise we will only use the default label that is the 'node_name' and

ironic_prometheus_exporter/parsers/redfish.py

@@ -15,8 +15,8 @@ import logging
 
 from prometheus_client import Gauge
 
-from ironic_prometheus_exporter import utils as ipe_utils
 from ironic_prometheus_exporter.parsers import descriptions
+from ironic_prometheus_exporter import utils as ipe_utils
 
 
 LOG = logging.getLogger(__name__)

ironic_prometheus_exporter/tests/test_descriptions.py

@@ -10,10 +10,10 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from ironic_prometheus_exporter.parsers import descriptions
-
 from oslo_messaging.tests import utils as test_utils
 
+from ironic_prometheus_exporter.parsers import descriptions
+
 
 class TestMetricsDescriptions(test_utils.BaseTestCase):
 

ironic_prometheus_exporter/tests/test_driver.py

@@ -10,14 +10,15 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import fixtures
 import json
 import os
+
+import fixtures
 import oslo_messaging
+from oslo_messaging.tests import utils as test_utils
 
 import ironic_prometheus_exporter
 from ironic_prometheus_exporter.messaging import PrometheusFileDriver
-from oslo_messaging.tests import utils as test_utils
 
 
 class TestPrometheusFileNotifier(test_utils.BaseTestCase):

ironic_prometheus_exporter/tests/test_header_parser.py

@@ -14,11 +14,12 @@ import json
 import os
 import unittest
 
-import ironic_prometheus_exporter
-from ironic_prometheus_exporter import utils as ipe_utils
-from ironic_prometheus_exporter.parsers import header
 from prometheus_client import CollectorRegistry
 
+import ironic_prometheus_exporter
+from ironic_prometheus_exporter.parsers import header
+from ironic_prometheus_exporter import utils as ipe_utils
+
 
 sample_file = os.path.join(
     os.path.dirname(ironic_prometheus_exporter.__file__),

ironic_prometheus_exporter/tests/test_ipmi_parser.py

@@ -14,11 +14,12 @@ import json
 import os
 import unittest
 
-import ironic_prometheus_exporter
-from ironic_prometheus_exporter import utils as ipe_utils
-from ironic_prometheus_exporter.parsers import ipmi
 from prometheus_client import CollectorRegistry
 
+import ironic_prometheus_exporter
+from ironic_prometheus_exporter.parsers import ipmi
+from ironic_prometheus_exporter import utils as ipe_utils
+
 
 sample_file = os.path.join(
     os.path.dirname(ironic_prometheus_exporter.__file__),

ironic_prometheus_exporter/tests/test_redfish_parser.py

@@ -1,12 +1,25 @@
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
 import json
 import os
 import unittest
 
-import ironic_prometheus_exporter
-from ironic_prometheus_exporter import utils as ipe_utils
-from ironic_prometheus_exporter.parsers import redfish
 from prometheus_client import CollectorRegistry
 
+import ironic_prometheus_exporter
+from ironic_prometheus_exporter.parsers import redfish
+from ironic_prometheus_exporter import utils as ipe_utils
+
 
 sample_file = os.path.join(
     os.path.dirname(ironic_prometheus_exporter.__file__),

lower-constraints.txt

@@ -23,6 +23,7 @@ Flask==1.0.0
 future==0.18.2
 futurist==2.1.0
 greenlet==0.4.15
+hacking==3.0.0
 idna==2.9
 importlib-metadata==1.6.0
 iso8601==0.1.12

test-requirements.txt

@@ -1,3 +1,6 @@
+hacking>=3.0.0,<3.1.0 # Apache-2.0
+
 flake8
+flake8-import-order>=0.17.1
 stestr>=2.0.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0

tox.ini

@@ -54,10 +54,11 @@ deps =
 commands = {posargs}
 
 [flake8]
-ignore = E129
+application-import-names = ironic_prometheus_exporter
-show-source = True
-builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+import-order-style = pep8
+show-source = True
+
 
 [testenv:lower-constraints]
 deps =