Update hacking for Python3

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

Fix problems found by updated hacking version.

Update local hacking checks for new flake8.

Remove hacking and friends from lower-constraints, they are not
needed in installations.

Change-Id: I6e6638c07b5d24c90e9deae277e98149f383eb3d

5 files changed, 24 insertions, 27 deletions

diff --git a/lower-constraints.txt b/lower-constraints.txt
index 51caa274..81b58e1e 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -33,13 +33,11 @@ eventlet==0.18.2
 extras==1.0.0
 fasteners==0.14.1
 fixtures==3.0.0
-flake8==2.5.5
 future==0.16.0
 futurist==1.6.0
 gitdb2==2.0.3
 GitPython==2.1.8
 greenlet==0.4.13
-hacking==0.12.0
 httplib2==0.9.1
 idna==2.6
 imagesize==1.0.0
@@ -96,7 +94,6 @@ passlib==1.7.0
 Paste==2.0.2
 PasteDeploy==1.5.0
 pbr==2.0.0
-pep8==1.7.1
 pexpect==3.1
 pika-pool==0.1.3
 pika==0.10.0
@@ -106,7 +103,6 @@ psycopg2==2.6.2
 ptyprocess==0.5.2
 pycadf==2.7.0
 pycparser==2.18
-pyflakes==1.0.0
 Pygments==2.2.0
 pyinotify==0.9.6
 pylint==1.9.2 # GPLv2
diff --git a/test-requirements.txt b/test-requirements.txt
index 4080244b..c8dbd865 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 # Hacking already pins down pep8, pyflakes and flake8
-hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
+hacking>=3.0,<3.1.0 # Apache-2.0
 bandit>=1.1.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 nose>=1.3.7 # LGPL
diff --git a/tox.ini b/tox.ini
index 9971f08c..f8082055 100644
--- a/tox.ini
+++ b/tox.ini
@@ -65,7 +65,14 @@ filename=*.py,trove-*,app.wsgi
 
 [hacking]
 import_exceptions = trove.common.i18n
-local-check-factory = trove.hacking.checks.factory
+
+[flake8:local-plugins]
+extension =
+    T103= checks:check_raised_localized_exceptions
+    T104 = checks:check_no_basestring
+    T105 = checks:no_translate_logs
+    N335 = checks:assert_raises_regexp
+paths = ./trove/hacking
 
 [testenv:api-ref]
 # This environment is called from CI scripts to test and publish
diff --git a/trove/hacking/checks.py b/trove/hacking/checks.py
index 26d30ec9..851ddd66 100644
--- a/trove/hacking/checks.py
+++ b/trove/hacking/checks.py
@@ -12,7 +12,9 @@
 
 import re
 
-import pep8
+import pycodestyle
+
+from hacking import core
 
 _all_log_levels = (
     'critical',
@@ -34,6 +36,7 @@ def _translation_is_not_expected(filename):
     return any(pat in filename for pat in ["/tests/"])
 
 
+@core.flake8ext
 def check_raised_localized_exceptions(logical_line, filename):
     """T103 - Untranslated exception message.
     :param logical_line: The logical line to check.
@@ -55,6 +58,7 @@ def check_raised_localized_exceptions(logical_line, filename):
             yield (logical_line.index(exception_msg), msg)
 
 
+@core.flake8ext
 def check_no_basestring(logical_line):
     """T104 - Don't use basestring, use six.string_types instead
        basestring is not supported by py3, using six.string_types to ensure
@@ -66,7 +70,8 @@ def check_no_basestring(logical_line):
         yield(0, msg)
 
 
-def no_translate_logs(logical_line, physical_line, filename):
+@core.flake8ext
+def no_translate_logs(physical_line, logical_line, filename):
     """T105 - Log messages shouldn't be translated from the
     Pike release.
     :param logical_line: The logical line to check.
@@ -79,7 +84,7 @@ def no_translate_logs(logical_line, physical_line, filename):
     if _translation_is_not_expected(filename):
         return
 
-    if pep8.noqa(physical_line):
+    if pycodestyle.noqa(physical_line):
         return
 
     msg = "T105: Log message shouldn't be translated."
@@ -90,6 +95,7 @@ def no_translate_logs(logical_line, physical_line, filename):
 asse_raises_regexp = re.compile(r"assertRaisesRegexp\(")
 
 
+@core.flake8ext
 def assert_raises_regexp(logical_line):
     """Check for usage of deprecated assertRaisesRegexp
 
@@ -99,10 +105,3 @@ def assert_raises_regexp(logical_line):
     if res:
         yield (0, "N335: assertRaisesRegex must be used instead "
                   "of assertRaisesRegexp")
-
-
-def factory(register):
-    register(check_raised_localized_exceptions)
-    register(check_no_basestring)
-    register(no_translate_logs)
-    register(assert_raises_regexp)
diff --git a/trove/tests/unittests/hacking/test_check.py b/trove/tests/unittests/hacking/test_check.py
index d2874b44..3f6c4021 100644
--- a/trove/tests/unittests/hacking/test_check.py
+++ b/trove/tests/unittests/hacking/test_check.py
@@ -11,7 +11,7 @@
 #    under the License.
 
 import mock
-import pep8
+import pycodestyle
 import textwrap
 
 from trove.hacking import checks as tc
@@ -28,11 +28,6 @@ class HackingTestCase(trove_testtools.TestCase):
     def assertLineFails(self, func, *args):
         self.assertIsInstance(next(func(*args)), tuple)
 
-    def test_factory(self):
-        def check_callable(fn):
-            self.assertTrue(hasattr(fn, '__call__'))
-        self.assertIsNone(tc.factory(check_callable))
-
     def test_log_translations(self):
         all_log_levels = (
             'critical',
@@ -89,20 +84,20 @@ class HackingTestCase(trove_testtools.TestCase):
             0,
             len(list(tc.check_no_basestring("this basestring is good)"))))
 
-    # We are patching pep8 so that only the check under test is actually
+    # We are patching pycodestyle so that only the check under test is actually
     # installed.
-    @mock.patch('pep8._checks',
+    @mock.patch('pycodestyle._checks',
                 {'physical_line': {}, 'logical_line': {}, 'tree': {}})
     def _run_check(self, code, checker, filename=None):
-        pep8.register_check(checker)
+        pycodestyle.register_check(checker)
 
         lines = textwrap.dedent(code).strip().splitlines(True)
 
-        checker = pep8.Checker(filename=filename, lines=lines)
+        checker = pycodestyle.Checker(filename=filename, lines=lines)
         # NOTE(sdague): the standard reporter has printing to stdout
         # as a normal part of check_all, which bleeds through to the
         # test output stream in an unhelpful way. This blocks that printing.
-        with mock.patch('pep8.StandardReport.get_file_results'):
+        with mock.patch('pycodestyle.StandardReport.get_file_results'):
             checker.check_all()
         checker.report._deferred_print.sort()
         return checker.report._deferred_print