Fix KeyError in get_attribute function

Fix KeyError is raised in get_attribute validation in case of
nested data types.
The data type schema was not correctly managed.

Closes-Bug: 1965089
Change-Id: Ic87a3c429105d6108507de05a31b788538ee2259

toscaparser/functions.py

@@ -159,6 +159,7 @@ class GetAttribute(Function):
                     return
 
             value_type = attr.schema['type']
+            value_schema = attr.schema
             if len(self.args) > index:
                 for elem in self.args[index:]:
                     if value_type == "list":
@@ -168,9 +169,9 @@ class GetAttribute(Function):
                                              ' "{0}". "{1}" Expected positive'
                                              ' integer argument'
                                              ).format(GET_ATTRIBUTE, elem)))
-                        value_type = attr.schema['entry_schema']['type']
+                        value_type = value_schema['entry_schema']['type']
                     elif value_type == "map":
-                        value_type = attr.schema['entry_schema']['type']
+                        value_type = value_schema['entry_schema']['type']
                     elif value_type in Schema.PROPERTY_TYPES:
                         ExceptionCollector.appendException(
                             ValueError(_('Illegal arguments for function'
@@ -186,6 +187,7 @@ class GetAttribute(Function):
                         if found:
                             prop = found[0]
                             value_type = prop.schema['type']
+                            value_schema = prop.schema
                         else:
                             ExceptionCollector.appendException(
                                 KeyError(_('Illegal arguments for function'

toscaparser/tests/data/custom_types/custom_nested_data_types.yaml

@@ -0,0 +1,29 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+data_types:
+
+  tosca.datatypes.SomeTask:
+    derived_from: tosca.datatypes.Root
+    properties:
+      state:
+        type: string
+      output:
+        type: string
+
+  tosca.datatypes.OtherTask:
+    derived_from: tosca.datatypes.Root
+    properties:
+      tasks:
+        type: map
+        entry_schema:
+          type: tosca.datatypes.SomeTask
+
+node_types:
+
+  tosca.nodes.SomeApp:
+    derived_from: tosca.nodes.SoftwareComponent
+    attributes:
+      some_new_att:
+        type: map
+        entry_schema:
+          type: tosca.datatypes.OtherTask

toscaparser/tests/data/functions/test_get_attribute_nested_data_types.yaml

@@ -0,0 +1,36 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: Template for testing get_attribute with a custom data type
+
+imports:
+  - ../custom_types/custom_nested_data_types.yaml
+
+topology_template:
+
+  node_templates:
+
+    some_app:
+      type: tosca.nodes.SomeApp
+      requirements:
+      - host: server
+
+    server:
+      type: tosca.nodes.Compute
+      capabilities:
+        # Host container properties
+        host:
+          properties:
+            num_cpus: 2
+            disk_size: 10 GB
+            mem_size: 512 MB
+        # Guest Operating System properties
+        os:
+          properties:
+            # host Operating System image properties
+            architecture: x86_64
+            type: Linux
+            distribution: RHEL
+            version: 6.5
+  outputs:
+    url:
+      value: { get_attribute: [ some_app, some_new_att, map_value, tasks, other_map, output ]}

toscaparser/tests/test_functions.py

@@ -346,6 +346,10 @@ class GetAttributeTest(TestCase):
         self.assertIsNotNone(self._load_template(
             'functions/test_get_attribute_custom_data_type.yaml'))
 
+    def test_get_attribute_neste_data_types(self):
+        self.assertIsNotNone(self._load_template(
+            'functions/test_get_attribute_nested_data_types.yaml'))
+
 
 class ConcatTest(TestCase):