VNF scaling: TOSCA definitions and sample template

implements blueprint: #vnf-scaling

Change-Id: I315e5d4df9217b499c537ae31ca80cfe212a55b5

samples/tosca-templates/vnfd/tosca-vnfd-scale.yaml

@@ -0,0 +1,63 @@
+tosca_definitions_version: tosca_simple_profile_for_nfv_1_0_0
+
+description: sample-tosca-vnfd-scaling
+
+metadata:
+  template_name: sample-tosca-vnfd-scaling
+
+topology_template:
+  node_templates:
+    VDU1:
+      type: tosca.nodes.nfv.VDU.Tacker
+      properties:
+        image: cirros-0.3.4-x86_64-uec
+        mgmt_driver: noop
+        availability_zone: nova
+        flavor: m1.tiny
+
+    CP1:
+      type: tosca.nodes.nfv.CP.Tacker
+      properties:
+        management: true
+        anti_spoofing_protection: false
+      requirements:
+        - virtualLink:
+            node: VL1
+        - virtualBinding:
+            node: VDU1
+
+    VDU2:
+      type: tosca.nodes.nfv.VDU.Tacker
+      properties:
+        image: cirros-0.3.4-x86_64-uec
+        mgmt_driver: noop
+        availability_zone: nova
+        flavor: m1.tiny
+
+    CP2:
+      type: tosca.nodes.nfv.CP.Tacker
+      properties:
+        management: true
+        anti_spoofing_protection: false
+      requirements:
+        - virtualLink:
+            node: VL1
+        - virtualBinding:
+            node: VDU2
+
+    VL1:
+      type: tosca.nodes.nfv.VL
+      properties:
+        network_name: private
+        vendor: Tacker
+
+  policies:
+    - SP1:
+        type: tosca.policy.tacker.Scaling
+        properties:
+          increment: 1
+          cooldown: 120
+          min_instances: 1
+          max_instances: 3
+          default_instances: 2
+          targets: [VDU1, VDU2]

tacker/tests/unit/vm/test_tosca_templates_under_samples.py

@@ -0,0 +1,76 @@
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import os
+import testtools
+
+from toscaparser import tosca_template
+from toscaparser.utils import yamlparser
+
+from tacker.vm.tosca import utils
+from translator.hot import tosca_translator
+
+
+# TODO(kanagaraj-manickam) Update it for including other samples also
+def get_list_of_samples():
+    base_path = (os.path.dirname(os.path.abspath(__file__)) +
+                '/../../../../samples/tosca-templates/vnfd/')
+    return [base_path + 'tosca-vnfd-scale.yaml']
+
+
+class TestSamples(testtools.TestCase):
+    """Sample tosca validation.
+
+    Helps to validate the tosca templates provided in the samples folder
+    to make sure whether its valid YAML, valid TOSCA and
+    possible to translate into HOT template.
+    """
+
+    def test_samples(self):
+        for f in get_list_of_samples():
+            with open(f, 'r') as _f:
+                yaml_dict = None
+                try:
+                    yaml_dict = yamlparser.simple_ordered_parse(_f.read())
+                except:  # noqa
+                    pass
+
+                self.assertIsNotNone(
+                    yaml_dict,
+                    "Yaml parser failed to parse %s" % f)
+
+                utils.updateimports(yaml_dict)
+
+                tosca = None
+                try:
+                    tosca = tosca_template.ToscaTemplate(
+                        a_file=False,
+                        yaml_dict_tpl=yaml_dict)
+                except:  # noqa
+                    pass
+
+                self.assertIsNotNone(
+                    tosca,
+                    "Tosca parser failed to parse %s" % f)
+
+                hot = None
+                try:
+                    hot = tosca_translator.TOSCATranslator(tosca,
+                                                           {}).translate()
+                except:  # noqa
+                    pass
+
+                self.assertIsNotNone(
+                    hot,
+                    "Heat-translator failed to translate %s" % f)

tacker/vm/tosca/lib/tacker_defs.yaml

@@ -125,6 +125,34 @@ policy_types:
     properties:
       name: http-ping
 
-group_types:
+  tosca.policies.tacker.Scaling:
-  tosca.groups.tacker.VDU:
+    derived_from: tosca.policies.Scaling
-    derived_from: tosca.groups.Root
+    description: Defines policy for scaling the given targets.
+    properties:
+      increment:
+        type: integer
+        required: true
+        description: Number of nodes to add or remove during the scale out/in.
+      targets:
+        type: list
+        entry_schema:
+          type: string
+        required: true
+        description: List of Scaling nodes.
+      min_instances:
+        type: integer
+        required: true
+        description: Minimum number of instances to scale in.
+      max_instances:
+        type: integer
+        required: true
+        description: Maximum number of instances to scale out.
+      default_instances:
+        type: integer
+        required: true
+        description: Initial number of instances.
+      cooldown:
+        type: integer
+        required: false
+        default: 120
+        description: Wait time (in seconds) between consecutive scaling operations. During the cooldown period, scaling action will be ignored