py3: port common/storage_policy.py

Change-Id: I7030280a8495628df9ed8edcc8abc31f901da72e

swift/common/storage_policy.py

@@ -203,8 +203,17 @@ class BaseStoragePolicy(object):
     def __int__(self):
         return self.idx
 
-    def __cmp__(self, other):
+    def __eq__(self, other):
-        return cmp(self.idx, int(other))
+        return self.idx == int(other)
+
+    def __ne__(self, other):
+        return self.idx != int(other)
+
+    def __lt__(self, other):
+        return self.idx < int(other)
+
+    def __gt__(self, other):
+        return self.idx > int(other)
 
     def __repr__(self):
         return ("%s(%d, %r, is_default=%s, "
@@ -923,7 +932,12 @@ def reload_storage_policies():
     Reload POLICIES from ``swift.conf``.
     """
     global _POLICIES
+    if six.PY2:
         policy_conf = ConfigParser()
+    else:
+        # Python 3.2 disallows section or option duplicates by default
+        # strict=False allows us to preserve the older behavior
+        policy_conf = ConfigParser(strict=False)
     policy_conf.read(utils.SWIFT_CONF_FILE)
     try:
         _POLICIES = parse_storage_policies(policy_conf)

test/unit/common/test_storage_policy.py

@@ -70,7 +70,10 @@ class FakeStoragePolicy(BaseStoragePolicy):
 class TestStoragePolicies(unittest.TestCase):
     def _conf(self, conf_str):
         conf_str = "\n".join(line.strip() for line in conf_str.split("\n"))
+        if six.PY2:
             conf = ConfigParser()
+        else:
+            conf = ConfigParser(strict=False)
         conf.readfp(six.StringIO(conf_str))
         return conf
 
@@ -679,7 +682,7 @@ class TestStoragePolicies(unittest.TestCase):
         with capture_logging('swift.common.storage_policy') as records, \
                 self.assertRaises(PolicyError) as exc_mgr:
             parse_storage_policies(bad_conf)
-        self.assertEqual(exc_mgr.exception.message,
+        self.assertEqual(exc_mgr.exception.args[0],
                          'Storage policy bad-policy uses an EC '
                          'configuration known to harm data durability. This '
                          'policy MUST be deprecated.')
@@ -1048,7 +1051,7 @@ class TestStoragePolicies(unittest.TestCase):
         [storage-policy:00]
         name = double-zero
         """)
-        with NamedTemporaryFile() as f:
+        with NamedTemporaryFile(mode='w+t') as f:
             conf.write(f)
             f.flush()
             with mock.patch('swift.common.utils.SWIFT_CONF_FILE',

tox.ini

@@ -38,6 +38,7 @@ commands =
       test/unit/common/test_linkat.py \
       test/unit/common/test_manager.py \
       test/unit/common/test_splice.py \
+      test/unit/common/test_storage_policy.py \
       test/unit/common/test_utils.py
 
 [testenv:py35]