Use oslo_serialization.base64 to follow OpenStack Python3

This patch replaces python standard base64 library call to
oslo_serialization.base64 to follow OpenStack Python3 porting
standard [1].

Use base64 encoding takes 8-bit binary byte data and encodes it. On
Python3, A string is a sequence of Unicode characters thus base64 has
no idea what to do with Unicode data, it's not 8-bit[2]. We use
oslo_serialization.base64 for python2 and python3.

[1] https://wiki.openstack.org/wiki/Python3
[2] http://stackoverflow.com/questions/8908287/base64-encoding-in-python-3

Change-Id: Ibf24df3a90ecbcdec400a0570f2818f89b78ea0a

ironic_inspector/process.py

@@ -13,7 +13,6 @@
 
 """Handling introspection data from the ramdisk."""
 
-import base64
 import copy
 import datetime
 import os
@@ -22,6 +21,7 @@ import eventlet
 import json
 
 from oslo_config import cfg
+from oslo_serialization import base64
 from oslo_utils import excutils
 
 from ironic_inspector.common.i18n import _, _LE, _LI, _LW
@@ -73,7 +73,7 @@ def _store_logs(introspection_data, node_info):
             os.makedirs(CONF.processing.ramdisk_logs_dir)
         with open(os.path.join(CONF.processing.ramdisk_logs_dir, file_name),
                   'wb') as fp:
-            fp.write(base64.b64decode(logs))
+            fp.write(base64.decode_as_bytes(logs))
     except EnvironmentError:
         LOG.exception(_LE('Could not store the ramdisk logs'),
                       data=introspection_data, node_info=node_info)

ironic_inspector/test/unit/test_process.py

@@ -11,7 +11,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import base64
 import copy
 import functools
 import json
@@ -25,6 +24,7 @@ import fixtures
 from ironicclient import exceptions
 import mock
 from oslo_config import cfg
+from oslo_serialization import base64
 from oslo_utils import uuidutils
 
 from ironic_inspector.common import ironic as ir_utils
@@ -256,7 +256,7 @@ class TestStoreLogs(BaseProcessTest):
         CONF.set_override('ramdisk_logs_dir', self.tempdir, 'processing')
 
         self.logs = b'test logs'
-        self.data['logs'] = base64.b64encode(self.logs)
+        self.data['logs'] = base64.encode_as_bytes(self.logs)
 
     def _check_contents(self, name=None):
         files = os.listdir(self.tempdir)

requirements.txt

@@ -22,6 +22,7 @@ oslo.i18n>=2.1.0 # Apache-2.0
 oslo.log>=3.11.0 # Apache-2.0
 oslo.middleware>=3.0.0 # Apache-2.0
 oslo.rootwrap>=5.0.0 # Apache-2.0
+oslo.serialization>=1.10.0 # Apache-2.0
 oslo.utils>=3.18.0 # Apache-2.0
 six>=1.9.0 # MIT
 stevedore>=1.17.1 # Apache-2.0