Remove CPickle

Replace the following items with Python 3 style code.

- six.move.CPickle
- six.PY2
- six.string_types

Subsequent patches will replace other six usages.

Change-Id: I1530d441384e18d7955302c2752211f149a370f7

vitrage/common/utils.py

@@ -21,9 +21,8 @@ from collections import defaultdict
 import copy
 import hashlib
 import itertools
+import pickle
 import random
-import six
-from six.moves import cPickle
 import threading
 import time
 import zlib
@@ -102,11 +101,8 @@ def md5(obj):
     if isinstance(obj, tuple):
         obj = str([str(o) for o in obj])
 
-    if isinstance(obj, six.string_types):
-        if six.PY2:
-            return hashlib.md5(obj).hexdigest()
-        else:
-            return hashlib.md5(obj.encode('utf-8')).hexdigest()
+    if isinstance(obj, str):
+        return hashlib.md5(obj.encode('utf-8')).hexdigest()
     raise Exception('Unknown object for md5 %s' % obj)
 
 
@@ -143,7 +139,7 @@ def timed_method(log_results=False, warn_above_sec=-1):
 
 
 def compress_obj(obj, level=9):
-    str_data = cPickle.dumps(obj)
+    str_data = pickle.dumps(obj)
     data = base64.b64encode(zlib.compress(str_data, level))
     return data
 
@@ -151,7 +147,7 @@ def compress_obj(obj, level=9):
 def decompress_obj(blob):
     decoded_blob = base64.standard_b64decode(blob)
     str_data = zlib.decompress(decoded_blob)
-    obj = cPickle.loads(str_data)
+    obj = pickle.loads(str_data)
     del decoded_blob
     del str_data
     return obj

vitrage/evaluator/template_functions/function_resolver.py

@@ -15,7 +15,6 @@
 from collections import namedtuple
 from oslo_log import log
 import re
-import six
 
 from vitrage.evaluator.template_validation.base import ValidationError
 
@@ -41,7 +40,7 @@ def _recursive_resolve_function(func_info, template, template_block,
                                 resolve, **kwargs):
 
     for key, value in template_block.items():
-        if isinstance(value, six.string_types) and \
+        if isinstance(value, str) and \
                 _is_wanted_function(value, func_info.name):
 
             if not func_info.func:

vitrage/graph/algo_driver/sub_graph_matching.py

@@ -13,7 +13,6 @@
 # under the License.
 
 from oslo_log import log as logging
-import six
 
 from vitrage.common.exception import VitrageAlgorithmError
 from vitrage.graph.filter import check_filter
@@ -170,7 +169,7 @@ def _generate_result(final_subgraphs):
         subgraph_vertices = dict()
         for v in mapping.get_vertices():
             v_id = v[MAPPED_V_ID]
-            if isinstance(v_id, six.string_types) and v_id is not NEG_VERTEX:
+            if isinstance(v_id, str) and v_id is not NEG_VERTEX:
                 subgraph_vertices[v.vertex_id] = v[GRAPH_VERTEX]
 
         if subgraph_vertices not in result:

vitrage/graph/driver/networkx_graph.py

@@ -18,7 +18,7 @@ import json
 import networkx as nx
 from networkx.algorithms.operators.binary import compose
 from networkx.readwrite import json_graph
-from six.moves import cPickle
+import pickle
 
 from oslo_log import log as logging
 
@@ -359,7 +359,7 @@ class NXGraph(Graph):
             return json.dumps(node_link_data)
 
     def write_gpickle(self):
-        return cPickle.dumps(self._g, cPickle.HIGHEST_PROTOCOL)
+        return pickle.dumps(self._g, pickle.HIGHEST_PROTOCOL)
 
     @staticmethod
     def read_gpickle(data, graph_to_update=None):
@@ -367,7 +367,7 @@ class NXGraph(Graph):
             graph = graph_to_update
         else:
             graph = NXGraph()
-        graph._g = cPickle.loads(data)
+        graph._g = pickle.loads(data)
         return graph
 
     def union(self, other_graph):

vitrage/graph/query.py

@@ -13,7 +13,6 @@
 # under the License.
 
 from oslo_log import log as logging
-import six
 
 from vitrage.common.exception import VitrageError
 
@@ -103,7 +102,7 @@ def _create_query_expression(query, parent_operator=None):
 
 def _evaluable_str(value):
     """wrap string/unicode with back tick"""
-    if isinstance(value, six.string_types):
+    if isinstance(value, str):
         return '\'' + value + '\''
     else:
         return str(value)