Add support of unicode characters for node labels

Need to work with normalized string to support correct comparison.
Decode bytes from terminal as unicode string.

Change-Id: Ic217abb7a1c3a39fcb6c741bec14242a2117d2ae
Closes-Bug: #1477598

fuelclient/commands/node.py

@@ -48,6 +48,7 @@ class NodeList(NodeMixIn, base.BaseListCommand):
         parser.add_argument(
             '-l',
             '--labels',
+            type=utils.str_to_unicode,
             nargs='+',
             help='Show only nodes that have specific labels')
 

fuelclient/tests/common/unit/test_utils.py

@@ -16,6 +16,7 @@
 
 import json
 import os
+import six
 import subprocess
 
 import mock
@@ -220,3 +221,19 @@ class TestUtils(base.UnitTestCase):
 
         result = data_utils.get_display_data_multi(fields, test_data)
         self.assertEqual([[2, 3], [8, 9]], result)
+
+    @mock.patch('sys.getfilesystemencoding', return_value='utf-8')
+    def test_str_to_unicode(self, _):
+        test_data = 'тест'
+        expected_data = test_data if six.PY3 else u'тест'
+        result = utils.str_to_unicode(test_data)
+        self.assertIsInstance(result, six.text_type)
+        self.assertEqual(result, expected_data)
+
+    @mock.patch('sys.getfilesystemencoding', return_value='iso-8859-16')
+    def test_latin_str_to_unicode(self, _):
+        test_data = 'czegoś' if six.PY3 else u'czegoś'.encode('iso-8859-16')
+        expected_data = test_data if six.PY3 else u'czegoś'
+        result = utils.str_to_unicode(test_data)
+        self.assertIsInstance(result, six.text_type)
+        self.assertEqual(result, expected_data)

fuelclient/tests/v2/unit/cli/test_node.py

@@ -15,6 +15,7 @@
 #    under the License.
 
 import mock
+import six
 
 from fuelclient.tests.utils import fake_node
 from fuelclient.tests.v2.unit.cli import test_engine
@@ -71,6 +72,8 @@ class TestNodeCommand(test_engine.BaseCLITest):
         self.m_get_client.assert_called_once_with('node', mock.ANY)
         self.m_client.get_all.assert_called_once_with(
             environment_id=env_id, labels=labels)
+        self.assertIsInstance(
+            self.m_client.get_all.call_args[1].get('labels')[0], six.text_type)
 
     def test_node_show(self):
         node_id = 42

fuelclient/utils.py

@@ -18,7 +18,9 @@ import glob
 import io
 import json
 import os
+import six
 import subprocess
+import sys
 import yaml
 
 from distutils.version import StrictVersion
@@ -149,3 +151,13 @@ def parse_to_list_of_dicts(str_list):
                     'Not valid JSON data: {0}'.format(json_str))
         dict_list.append(json_str)
     return dict_list
+
+
+def str_to_unicode(string):
+    """Normalize input string from command line to unicode standard.
+
+    :param str string: string to normalize
+    :returns: normalized string
+
+    """
+    return string if six.PY3 else string.decode(sys.getfilesystemencoding())