Refactor methods in utils related to dicts

* The previous versions of these methods were too specific for the
  general utils module. Now they are more generic thereby less
  confusing.

Change-Id: Ifa8bbf0cc8a63bf1de1142dc8c52b1f8ad3958c5

mistral/lang/v2/actions.py

@@ -42,7 +42,7 @@ class ActionSpec(base.BaseSpec):
         self._tags = data.get('tags', [])
         self._base = data['base']
         self._base_input = data.get('base-input', {})
-        self._input = utils.get_input_dict(data.get('input', []))
+        self._input = utils.get_dict_from_entries(data.get('input', []))
         self._output = data.get('output')
 
         self._base, _input = self._parse_cmd_and_input(self._base)

mistral/lang/v2/workflows.py

@@ -54,7 +54,7 @@ class WorkflowSpec(base.BaseSpec):
         self._description = data.get('description')
         self._tags = data.get('tags', [])
         self._type = data['type'] if 'type' in data else 'direct'
-        self._input = utils.get_input_dict(data.get('input', []))
+        self._input = utils.get_dict_from_entries(data.get('input', []))
         self._output = data.get('output', {})
         self._output_on_error = data.get('output-on-error', {})
         self._vars = data.get('vars', {})

mistral/tests/unit/utils/test_utils.py

@@ -100,25 +100,26 @@ class UtilsTest(base.BaseTest):
 
         self.assertEqual([B, C, D], list(utils.iter_subclasses(A)))
 
-    def test_get_input_dict(self):
+    def test_get_dict_from_entries(self):
         input = ['param1', {'param2': 2}]
-        input_dict = utils.get_input_dict(input)
+        input_dict = utils.get_dict_from_entries(input)
 
         self.assertIn('param1', input_dict)
         self.assertIn('param2', input_dict)
         self.assertEqual(2, input_dict.get('param2'))
         self.assertIs(input_dict.get('param1'), utils.NotDefined)
 
-    def test_get_input_dict_from_input_string(self):
-        input_string = 'param1, param2=2, param3="var3"'
-        input_dict = utils.get_dict_from_string(input_string)
+    def test_get_input_dict_from_string(self):
+        self.assertDictEqual(
+            {
+                'param1': utils.NotDefined,
+                'param2': 2,
+                'param3': 'var3'
+            },
+            utils.get_dict_from_string('param1, param2=2, param3="var3"')
+        )
 
-        self.assertIn('param1', input_dict)
-        self.assertIn('param2', input_dict)
-        self.assertIn('param3', input_dict)
-        self.assertEqual(2, input_dict.get('param2'))
-        self.assertEqual('var3', input_dict.get('param3'))
-        self.assertIs(input_dict.get('param1'), utils.NotDefined)
+        self.assertDictEqual({}, utils.get_dict_from_string(''))
 
     def test_paramiko_to_private_key(self):
         self.assertRaises(

mistral/utils/__init__.py

@@ -343,53 +343,50 @@ class NotDefined(object):
     pass
 
 
-def get_dict_from_string(input_string, delimiter=','):
-    # TODO(rakhmerov): Why is it here? This module is too generic.
-    if not input_string:
+def get_dict_from_string(string, delimiter=','):
+    if not string:
         return {}
 
-    raw_inputs = input_string.split(delimiter)
+    kv_dicts = []
 
-    inputs = []
+    for kv_pair_str in string.split(delimiter):
+        kv_str = kv_pair_str.strip()
+        kv_list = kv_str.split('=')
 
-    for raw in raw_inputs:
-        input = raw.strip()
-        name_value = input.split('=')
-
-        if len(name_value) > 1:
+        if len(kv_list) > 1:
             try:
-                value = json.loads(name_value[1])
+                value = json.loads(kv_list[1])
             except ValueError:
-                value = name_value[1]
+                value = kv_list[1]
 
-            inputs += [{name_value[0]: value}]
+            kv_dicts += [{kv_list[0]: value}]
         else:
-            inputs += [name_value[0]]
+            kv_dicts += [kv_list[0]]
 
-    return get_input_dict(inputs)
+    return get_dict_from_entries(kv_dicts)
 
 
-def get_input_dict(inputs):
-    # TODO(rakhmerov): Why is it here? This module is too generic.
-    # TODO(rakhmerov): Move it to the spec.
+def get_dict_from_entries(entries):
+    """Transforms a list of entries into dictionary.
 
-    """Transform input list to dictionary.
-
-    Ensure every input param has a default value(it will be a NotDefined
-    object if it's not provided).
+    :param entries: A list of entries.
+        If an entry is a dictionary the method simply updates the result
+        dictionary with its content.
+        If an entry is not a dict adds {entry, NotDefined} into the result.
     """
-    input_dict = {}
 
-    for x in inputs:
-        if isinstance(x, dict):
-            input_dict.update(x)
+    result = {}
+
+    for e in entries:
+        if isinstance(e, dict):
+            result.update(e)
         else:
-            # NOTE(xylan): we put a NotDefined class here as the value of
-            # param without value specified, to distinguish from the valid
-            # values such as None, ''(empty string), etc.
-            input_dict[x] = NotDefined
+            # NOTE(xylan): we put NotDefined here as the value of
+            # param without value specified, to distinguish from
+            # the valid values such as None, ''(empty string), etc.
+            result[e] = NotDefined
 
-    return input_dict
+    return result
 
 
 def get_process_identifier():