Convert props form delimited params to lists

Use allow_conversion flag to convert comma_delimited_list
to list before validation when using from_parameter.

Change-Id: Id144aade23eee13df227acdb728906c8dd345337
Closes-Bug: #1617019

heat/common/param_utils.py

@@ -28,6 +28,16 @@ def extract_bool(name, value):
     return strutils.bool_from_string(value, strict=True)
 
 
+def delim_string_to_list(value):
+    if value is None:
+        return None
+
+    if value == '':
+        return []
+
+    return value.split(',')
+
+
 def extract_int(name, value, allow_zero=True, allow_negative=False):
     if value is None:
         return None

heat/engine/parameters.py

@@ -21,6 +21,7 @@ import six
 
 from heat.common import exception
 from heat.common.i18n import _
+from heat.common import param_utils
 from heat.engine import constraints as constr
 
 
@@ -376,10 +377,7 @@ class CommaDelimitedListParam(ParsedParameter, collections.Sequence):
         if isinstance(value, list):
             return [(six.text_type(x)) for x in value]
         try:
-            if value is not None:
+            return param_utils.delim_string_to_list(value)
-                if value == '':
-                    return []
-                return value.split(',')
         except (KeyError, AttributeError) as err:
             message = _('Value must be a comma-delimited list string: %s')
             raise ValueError(message % six.text_type(err))

heat/engine/properties.py

@@ -18,6 +18,7 @@ import six
 
 from heat.common import exception
 from heat.common.i18n import _
+from heat.common import param_utils
 from heat.engine import constraints as constr
 from heat.engine import function
 from heat.engine.hot import parameters as hot_param
@@ -162,7 +163,8 @@ class Schema(constr.Schema):
         # a json parameter value is passed via a Map property, which requires
         # some coercion to pass strings or lists (which are both valid for
         # Json parameters but not for Map properties).
-        allow_conversion = param.type == param.MAP
+        allow_conversion = (param.type == param.MAP
+                            or param.type == param.LIST)
 
         # make update_allowed true by default on TemplateResources
         # as the template should deal with this.
@@ -299,6 +301,9 @@ class Property(object):
     def _get_list(self, value, validate=False):
         if value is None:
             value = self.has_default() and self.default() or []
+        if self.schema.allow_conversion and isinstance(value,
+                                                       six.string_types):
+                value = param_utils.delim_string_to_list(value)
         if (not isinstance(value, collections.Sequence) or
                 isinstance(value, six.string_types)):
             raise TypeError(_('"%s" is not a list') % repr(value))

heat/tests/test_properties.py

@@ -598,7 +598,7 @@ class PropertySchemaTest(common.HeatTestCase):
         self.assertEqual(properties.Schema.LIST, schema.type)
         self.assertIsNone(schema.default)
         self.assertFalse(schema.required)
-        self.assertFalse(schema.allow_conversion)
+        self.assertTrue(schema.allow_conversion)
 
         props = properties.Properties({'test': schema}, {})
         props.validate()
@@ -903,6 +903,13 @@ class PropertyTest(common.HeatTestCase):
         p = properties.Property({'Type': 'List'})
         self.assertRaises(TypeError, p.get_value, {'foo': 'bar'})
 
+    def test_list_is_delimited(self):
+        p = properties.Property({'Type': 'List'})
+        self.assertRaises(TypeError, p.get_value, 'foo,bar')
+        p.schema.allow_conversion = True
+        self.assertEqual(['foo', 'bar'], p.get_value('foo,bar'))
+        self.assertEqual(['foo'], p.get_value('foo'))
+
     def test_list_maxlength_good(self):
         schema = {'Type': 'List',
                   'MaxLength': '3'}