Add support for HOST as first argument in get_property function.

It uses a similar solution used in the get_attribute function.

Change-Id: I70b75a415b8d3d78c25c61bdfc351f40d62bae2a
Related-Bug: 1511344

toscaparser/functions.py

@@ -18,6 +18,7 @@ import six
 from toscaparser.common.exception import ExceptionCollector
 from toscaparser.common.exception import UnknownInputError
 from toscaparser.dataentity import DataEntity
+from toscaparser.elements.entity_type import EntityType
 from toscaparser.utils.gettextutils import _
 
 
@@ -179,7 +180,6 @@ class GetAttribute(Function):
     def _find_host_containing_attribute(self, node_template_name=SELF):
         node_template = self._find_node_template(node_template_name)
         if node_template:
-            from toscaparser.elements.entity_type import EntityType
             hosted_on_rel = EntityType.TOSCA_DEF[HOSTED_ON]
             for r in node_template.requirements:
                 for requirement, target_name in r.items():
@@ -328,6 +328,9 @@ class GetProperty(Function):
     def _find_node_template(self, node_template_name):
         if node_template_name == SELF:
             return self.context
+        # enable the HOST value in the function
+        if node_template_name == HOST:
+            return self._find_host_containing_property()
         if not hasattr(self.tosca_tpl, 'nodetemplates'):
             return
         for node_template in self.tosca_tpl.nodetemplates:
@@ -338,6 +341,28 @@ class GetProperty(Function):
                 'Node template "{0}" was not found.'
                 ).format(node_template_name)))
 
+    # Add this functions similar to get_attribute case
+    def _find_host_containing_property(self, node_template_name=SELF):
+        node_template = self._find_node_template(node_template_name)
+        hosted_on_rel = EntityType.TOSCA_DEF[HOSTED_ON]
+        for r in node_template.requirements:
+            for requirement, target_name in r.items():
+                target_node = self._find_node_template(target_name)
+                target_type = target_node.type_definition
+                for capability in target_type.get_capabilities_objects():
+                    if capability.type in hosted_on_rel['valid_target_types']:
+                        if self._property_exists_in_type(target_type):
+                            return target_node
+                        return self._find_host_containing_property(
+                            target_name)
+        return None
+
+    def _property_exists_in_type(self, type_definition):
+        props_def = type_definition.get_properties_def()
+        found = [props_def[self.args[1]]] \
+            if self.args[1] in props_def else []
+        return len(found) == 1
+
     def result(self):
         if len(self.args) == 3:
             property_value = self._find_req_or_cap_property(self.args[1],

toscaparser/tests/data/custom_types/compute_with_prop.yaml

@@ -0,0 +1,13 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: >
+  Compute node type with a parameter for the get property with host test
+
+node_types:
+  tosca.nodes.ComputeWithProp:
+    derived_from: tosca.nodes.Compute
+    properties:
+      test:
+        required: false
+        type: integer
+

toscaparser/tests/data/functions/test_get_property_with_host.yaml

@@ -0,0 +1,65 @@
+tosca_definitions_version: tosca_simple_yaml_1_0
+
+description: >
+  TOSCA simple profile to test the get property function with HOST parameter
+
+imports:
+  - ../custom_types/compute_with_prop.yaml
+
+topology_template:
+  inputs:
+    db_name:
+      type: string
+      description: The name of the database.
+      default: wordpress
+    db_user:
+      type: string
+      description: The user name of the DB user.
+      default: wp_user
+    db_pwd:
+      type: string
+      description: The WordPress database admin account password.
+      default: wp_pass
+    db_root_pwd:
+      type: string
+      description: Root password for MySQL.
+    db_port:
+      type: PortDef
+      description: Port for the MySQL database.
+      default: 3306
+
+  node_templates:
+
+    mysql_database:
+      type: tosca.nodes.Database
+      properties:
+        name: { get_input: db_name }
+        user: { get_input: db_user }
+        password: { get_input: db_pwd }
+      capabilities:
+        database_endpoint:
+          properties:
+            port: { get_input: db_port }
+      requirements:
+        - host: mysql_dbms
+      interfaces:
+        Standard:
+          configure:
+            implementation: mysql/mysql_database_configure.sh
+            inputs:
+              db_port: { get_property: [ HOST, port ] }
+              test: { get_property: [ HOST, test ] }
+
+    mysql_dbms:
+      type: tosca.nodes.DBMS
+      properties:
+        root_password: { get_input: db_root_pwd }
+        port: { get_input: db_port }
+      requirements:
+        - host: server
+
+    server:
+      type: tosca.nodes.ComputeWithProp
+      properties:
+        test: 1
+

toscaparser/tests/test_functions.py

@@ -27,9 +27,11 @@ class IntrinsicFunctionsTest(TestCase):
     params = {'db_name': 'my_wordpress', 'db_user': 'my_db_user'}
     tosca = ToscaTemplate(tosca_tpl, parsed_params=params)
 
-    def _get_node(self, node_name):
+    def _get_node(self, node_name, tosca=None):
+        if tosca is None:
+            tosca = self.tosca
         return [
-            node for node in self.tosca.nodetemplates
+            node for node in tosca.nodetemplates
             if node.name == node_name][0]
 
     def _get_operation(self, interfaces, operation):
@@ -116,6 +118,22 @@ class IntrinsicFunctionsTest(TestCase):
                                                 'root_password')
         self.assertIsNone(dbms_root_password.result())
 
+    def test_get_property_with_host(self):
+        tosca_tpl = os.path.join(
+            os.path.dirname(os.path.abspath(__file__)),
+            "data/functions/test_get_property_with_host.yaml")
+        mysql_database = self._get_node('mysql_database',
+                                        ToscaTemplate(tosca_tpl))
+        operation = self._get_operation(mysql_database.interfaces, 'configure')
+        db_port = operation.inputs['db_port']
+        self.assertTrue(isinstance(db_port, functions.GetProperty))
+        result = db_port.result()
+        self.assertEqual(3306, result)
+        test = operation.inputs['test']
+        self.assertTrue(isinstance(test, functions.GetProperty))
+        result = test.result()
+        self.assertEqual(1, result)
+
 
 class GetAttributeTest(TestCase):