[WIP] Heal and scale method support of lcm_user_data

Customization of stack parameter during heal and scale through
lcm_user_data.

Implement: blueprint stack-parameter-customization
Change-Id: I393c0fd3ee32ee545ce5adf70b57af97d4177f2c

tacker/tests/etc/samples/vnf_vnfd_dict_scale.yaml

@@ -0,0 +1,403 @@
+tosca_definitions_version: tosca_simple_yaml_1_2
+
+description: Simple deployment flavour for Sample VNF
+
+imports:
+  - etsi_nfv_sol001_common_types.yaml
+  - etsi_nfv_sol001_vnfd_types.yaml
+  - helloworld3_types.yaml
+
+topology_template:
+  inputs:
+    descriptor_id:
+      type: string
+    descriptor_version:
+      type: string
+    provider:
+      type: string
+    product_name:
+      type: string
+    software_version:
+      type: string
+    vnfm_info:
+      type: list
+      entry_schema:
+        type: string
+    flavour_id:
+      type: string
+    flavour_description:
+      type: string
+
+  substitution_mappings:
+    node_type: company.provider.VNF
+    properties:
+      flavour_id: simple
+    requirements:
+      virtual_link_external1_1: [ VDU1_CP1, virtual_link ]
+      virtual_link_external1_2: [ VDU2_CP1, virtual_link ]
+      virtual_link_external2_1: [ VDU1_CP2, virtual_link ]
+      virtual_link_external2_2: [ VDU2_CP2, virtual_link ]
+
+  node_templates:
+    VNF:
+      type: company.provider.VNF
+      properties:
+        flavour_description: A simple flavour
+      interfaces:
+        Vnflcm:
+          instantiate: []
+          instantiate_start: []
+          instantiate_end: []
+          terminate: []
+          terminate_start: []
+          terminate_end: []
+          modify_information: []
+          modify_information_start: []
+          modify_information_end: []
+
+    VDU1:
+      type: tosca.nodes.nfv.Vdu.Compute
+      properties:
+        name: VDU1
+        description: VDU1 compute node
+        vdu_profile:
+          min_number_of_instances: 1
+          max_number_of_instances: 3
+      capabilities:
+        virtual_compute:
+          properties:
+            requested_additional_capabilities:
+              properties:
+                requested_additional_capability_name: m1.tiny
+                support_mandatory: true
+                target_performance_parameters:
+                  entry_schema: test
+            virtual_memory:
+              virtual_mem_size: 512 MB
+            virtual_cpu:
+              num_virtual_cpu: 1
+            virtual_local_storage:
+              - size_of_storage: 3 GB
+      requirements:
+        - virtual_storage: VirtualStorage
+
+    VDU2:
+      type: tosca.nodes.nfv.Vdu.Compute
+      properties:
+        name: VDU2
+        description: VDU2 compute node
+        vdu_profile:
+          min_number_of_instances: 2
+          max_number_of_instances: 2
+        sw_image_data:
+          name: cirros-0.5.2-x86_64-disk
+          version: '0.5.2'
+          checksum:
+            algorithm: sha-256
+            hash: 932fcae93574e242dc3d772d5235061747dfe537668443a1f0567d893614b464
+          container_format: bare
+          disk_format: qcow2
+          min_disk: 0 GB
+          min_ram: 256 MB
+          size: 12 GB
+      capabilities:
+        virtual_compute:
+          properties:
+            requested_additional_capabilities:
+              properties:
+                requested_additional_capability_name: m1.tiny
+                support_mandatory: true
+                target_performance_parameters:
+                  entry_schema: test
+            virtual_memory:
+              virtual_mem_size: 512 MB
+            virtual_cpu:
+              num_virtual_cpu: 1
+            virtual_local_storage:
+              - size_of_storage: 3 GB
+
+    VirtualStorage:
+      type: tosca.nodes.nfv.Vdu.VirtualBlockStorage
+      properties:
+        virtual_block_storage_data:
+          size_of_storage: 1 GB
+          rdma_enabled: true
+        sw_image_data:
+          name: cirros-0.5.2-x86_64-disk
+          version: '0.5.2'
+          checksum:
+            algorithm: sha-256
+            hash: 932fcae93574e242dc3d772d5235061747dfe537668443a1f0567d893614b464
+          container_format: bare
+          disk_format: qcow2
+          min_disk: 0 GB
+          min_ram: 256 MB
+          size: 12 GB
+
+    VDU1_CP1:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 0
+      requirements:
+        - virtual_binding: VDU1
+
+    VDU1_CP2:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 1
+      requirements:
+        - virtual_binding: VDU1
+
+    VDU1_CP3:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 2
+      requirements:
+        - virtual_binding: VDU1
+        - virtual_link: internalVL1
+
+    VDU1_CP4:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 3
+      requirements:
+        - virtual_binding: VDU1
+        - virtual_link: internalVL2
+
+    VDU1_CP5:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 4
+      requirements:
+        - virtual_binding: VDU1
+        - virtual_link: internalVL3
+
+    VDU2_CP1:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 0
+      requirements:
+        - virtual_binding: VDU2
+
+    VDU2_CP2:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 1
+      requirements:
+        - virtual_binding: VDU2
+
+    VDU2_CP3:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 2
+      requirements:
+        - virtual_binding: VDU2
+        - virtual_link: internalVL1
+
+    VDU2_CP4:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 3
+      requirements:
+        - virtual_binding: VDU2
+        - virtual_link: internalVL2
+
+    VDU2_CP5:
+      type: tosca.nodes.nfv.VduCp
+      properties:
+        layer_protocols: [ ipv4 ]
+        order: 4
+      requirements:
+        - virtual_binding: VDU2
+        - virtual_link: internalVL3
+
+    internalVL1:
+      type: tosca.nodes.nfv.VnfVirtualLink
+      properties:
+        connectivity_type:
+          layer_protocols: [ ipv4 ]
+        description: External Managed Virtual link in the VNF
+        vl_profile:
+          max_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          min_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          virtual_link_protocol_data:
+            - associated_layer_protocol: ipv4
+              l3_protocol_data:
+                ip_version: ipv4
+                cidr: 33.33.0.0/24
+
+    internalVL2:
+      type: tosca.nodes.nfv.VnfVirtualLink
+      properties:
+        connectivity_type:
+          layer_protocols: [ ipv4 ]
+        description: External Managed Virtual link in the VNF
+        vl_profile:
+          max_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          min_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          virtual_link_protocol_data:
+            - associated_layer_protocol: ipv4
+              l3_protocol_data:
+                ip_version: ipv4
+                cidr: 33.34.0.0/24
+
+    internalVL3:
+      type: tosca.nodes.nfv.VnfVirtualLink
+      properties:
+        connectivity_type:
+          layer_protocols: [ ipv4 ]
+        description: Internal Virtual link in the VNF
+        vl_profile:
+          max_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          min_bitrate_requirements:
+            root: 1048576
+            leaf: 1048576
+          virtual_link_protocol_data:
+            - associated_layer_protocol: ipv4
+              l3_protocol_data:
+                ip_version: ipv4
+                cidr: 33.35.0.0/24
+
+  policies:
+    - scaling_aspects:
+        type: tosca.policies.nfv.ScalingAspects
+        properties:
+          aspects:
+            VDU1_scale:
+              name: VDU1_scale
+              description: VDU1 scaling aspect
+              max_scale_level: 2
+              step_deltas:
+                - delta_1
+
+    - VDU1_initial_delta:
+        type: tosca.policies.nfv.VduInitialDelta
+        properties:
+          initial_delta:
+            number_of_instances: 1
+        targets: [ VDU1 ]
+
+    - VDU2_initial_delta:
+        type: tosca.policies.nfv.VduInitialDelta
+        properties:
+          initial_delta:
+            number_of_instances: 2
+        targets: [ VDU2 ]
+
+    - VDU1_scaling_aspect_deltas:
+        type: tosca.policies.nfv.VduScalingAspectDeltas
+        properties:
+          aspect: VDU1_scale
+          deltas:
+            delta_1:
+              number_of_instances: 1
+        targets: [ VDU1 ]
+
+    - instantiation_levels:
+        type: tosca.policies.nfv.InstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              description: Smallest size
+              scale_info:
+                VDU1_scale:
+                  scale_level: 0
+            instantiation_level_2:
+              description: Largest size
+              scale_info:
+                VDU1_scale:
+                  scale_level: 2
+          default_level: instantiation_level_1
+
+    - VDU1_instantiation_levels:
+        type: tosca.policies.nfv.VduInstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              number_of_instances: 1
+            instantiation_level_2:
+              number_of_instances: 3
+        targets: [ VDU1 ]
+
+    - VDU2_instantiation_levels:
+        type: tosca.policies.nfv.VduInstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              number_of_instances: 2
+            instantiation_level_2:
+              number_of_instances: 2
+        targets: [ VDU2 ]
+
+    - internalVL1_instantiation_levels:
+        type: tosca.policies.nfv.VirtualLinkInstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+            instantiation_level_2:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+        targets: [ internalVL1 ]
+
+    - internalVL2_instantiation_levels:
+        type: tosca.policies.nfv.VirtualLinkInstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+            instantiation_level_2:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+        targets: [ internalVL2 ]
+
+    - internalVL3_instantiation_levels:
+        type: tosca.policies.nfv.VirtualLinkInstantiationLevels
+        properties:
+          levels:
+            instantiation_level_1:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+            instantiation_level_2:
+              bitrate_requirements:
+                root: 1048576
+                leaf: 1048576
+        targets: [ internalVL3 ]
+
+    - policy_antiaffinity_vdu1:
+        type: tosca.policies.nfv.AntiAffinityRule
+        targets: [ VDU1 ]
+        properties:
+          scope: zone
+
+    - policy_antiaffinity_vdu2:
+        type: tosca.policies.nfv.AntiAffinityRule
+        targets: [ VDU2 ]
+        properties:
+          scope: zone

tacker/tests/unit/vnflcm/test_vnflcm_driver.py

@@ -1768,9 +1768,14 @@ class TestVnflcmDriver(db_base.SqlTestCase):
             vim_type="openstack")
         scale_name_list = ["fake"]
         grp_id = "fake_id"
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
+
         driver = vnflcm_driver.VnfLcmDriver()
-        driver.scale(self.context, vnf_info, scale_vnf_request,
-        vim_connection_info, scale_name_list, grp_id)
+        driver.scale(self.context, vnf_info, vnf_instance,
+            scale_vnf_request, vim_connection_info,
+            scale_name_list, grp_id)
 
     @mock.patch.object(TackerManager, 'get_service_plugins',
         return_value={'VNFM': FakeVNFMPlugin()})
@@ -1796,12 +1801,17 @@ class TestVnflcmDriver(db_base.SqlTestCase):
             vim_type="openstack")
         scale_name_list = ["fake"]
         grp_id = "fake_id"
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
+
         with open(vnf_info["attributes"]["heat_template"], "r") as f:
             mock_safe_load.return_value = yaml.safe_load(f)
             print(mock_safe_load.return_value)
         driver = vnflcm_driver.VnfLcmDriver()
-        driver.scale(self.context, vnf_info, scale_vnf_request,
-        vim_connection_info, scale_name_list, grp_id)
+        driver.scale(self.context, vnf_info, vnf_instance,
+            scale_vnf_request, vim_connection_info,
+            scale_name_list, grp_id)
 
     @mock.patch.object(TackerManager, 'get_service_plugins',
         return_value={'VNFM': FakeVNFMPlugin()})
@@ -1827,12 +1837,16 @@ class TestVnflcmDriver(db_base.SqlTestCase):
             vim_type="openstack")
         scale_name_list = ["fake"]
         grp_id = "fake_id"
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
         with open(vnf_info["attributes"]["heat_template"], "r") as f:
             mock_safe_load.return_value = yaml.safe_load(f)
             print(mock_safe_load.return_value)
         driver = vnflcm_driver.VnfLcmDriver()
-        driver.scale(self.context, vnf_info, scale_vnf_request,
-        vim_connection_info, scale_name_list, grp_id)
+        driver.scale(self.context, vnf_info, vnf_instance,
+            scale_vnf_request,
+            vim_connection_info, scale_name_list, grp_id)
 
     @mock.patch.object(TackerManager, 'get_service_plugins',
         return_value={'VNFM': FakeVNFMPlugin()})
@@ -1858,12 +1872,17 @@ class TestVnflcmDriver(db_base.SqlTestCase):
             vim_type="openstack")
         scale_name_list = ["fake"]
         grp_id = "fake_id"
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
+
         with open(vnf_info["attributes"]["heat_template"], "r") as f:
             mock_safe_load.return_value = yaml.safe_load(f)
             print(mock_safe_load.return_value)
         driver = vnflcm_driver.VnfLcmDriver()
-        driver.scale(self.context, vnf_info, scale_vnf_request,
-        vim_connection_info, scale_name_list, grp_id)
+        driver.scale(self.context, vnf_info, vnf_instance,
+            scale_vnf_request,
+            vim_connection_info, scale_name_list, grp_id)
 
     @mock.patch.object(TackerManager, 'get_service_plugins',
         return_value={'VNFM': FakeVNFMPlugin()})
@@ -1968,6 +1987,9 @@ class TestVnflcmDriver(db_base.SqlTestCase):
                        'username': 'test_user',
                        'project_name': 'test_project'}}
         self.vim_client.get_vim.return_value = vim_obj
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
         driver.scale_vnf(self.context, vnf_info, vnf_instance,
             scale_vnf_request)
 
@@ -1993,13 +2015,16 @@ class TestVnflcmDriver(db_base.SqlTestCase):
         scale_name_list = ["fake"]
         grp_id = "fake_id"
         driver = vnflcm_driver.VnfLcmDriver()
-
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
         msg = 'Unknown scale type'
         self.assertRaisesRegex(exceptions.VnfScaleFailed,
                                msg,
                                driver.scale,
                                self.context,
                                vnf_info,
+                               vnf_instance,
                                scale_vnf_request,
                                vim_connection_info,
                                scale_name_list,
@@ -2029,11 +2054,15 @@ class TestVnflcmDriver(db_base.SqlTestCase):
         driver = vnflcm_driver.VnfLcmDriver()
 
         msg = 'Unknown vim type'
+        vnf_instance = fakes.return_vnf_instance(
+            fields.VnfInstanceState.INSTANTIATED,
+            task_state=fields.VnfInstanceTaskState.SCALING)
         self.assertRaisesRegex(exceptions.VnfScaleFailed,
                                msg,
                                driver.scale,
                                self.context,
                                vnf_info,
+                               vnf_instance,
                                scale_vnf_request,
                                vim_connection_info,
                                scale_name_list,

tacker/tests/unit/vnfm/infra_drivers/openstack/test_openstack_driver.py

@@ -13,14 +13,12 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+import ddt
 import importlib
 import json
 import os
-import tempfile
-from unittest import mock
-
-import ddt
 import requests
+import tempfile
 import yaml
 
 from heatclient.v1 import resources
@@ -43,7 +41,7 @@ from tacker.tests.unit.vnfm.infra_drivers.openstack.fixture_data import \
 from tacker.tests import uuidsentinel
 from tacker.vnfm.infra_drivers.openstack import heat_client as hc
 from tacker.vnfm.infra_drivers.openstack import openstack
-
+from unittest import mock
 
 vnf_dict = {
     'instance_id': 'd1121d3c-368b-4ac2-b39d-835aa3e4ccd8'
@@ -2169,7 +2167,7 @@ class TestOpenStack(base.FixturedTestCase):
         inst_vnf_info = fd_utils.get_vnf_instantiated_info(
             virtual_storage_resource_info=[v_s_resource_info],
             vnfc_resource_info=[vnfc_resource_info])
-
+        inst_vnf_info.additional_params = None
         vnf_instance = fd_utils.get_vnf_instance_object(
             instantiated_vnf_info=inst_vnf_info)
 
@@ -2205,6 +2203,7 @@ class TestOpenStack(base.FixturedTestCase):
         vnf_lcm_op_occs = fd_utils.get_lcm_op_occs_object(
             error_point=fields.ErrorPoint.PRE_VIM_CONTROL)
         mock_get_vnflcm_op_occs.return_value = vnf_lcm_op_occs
+
         self.openstack.heal_vnf(
             self.context, vnf_instance, vim_connection_info,
             heal_vnf_request)
@@ -2240,7 +2239,7 @@ class TestOpenStack(base.FixturedTestCase):
             instantiated_vnf_info=inst_vnf_info)
 
         vim_connection_info = fd_utils.get_vim_connection_info_object()
-
+        inst_vnf_info.additional_params = None
         heal_vnf_request = objects.HealVnfRequest(
             vnfc_instance_id=[vnfc_resource_info.id],
             cause="healing request")

tacker/tests/unit/vnfm/lcm_user_data/utils/test_utils.py

@@ -15,8 +15,10 @@ import os
 import testtools
 import yaml
 
+from tacker import objects
 from tacker.objects import instantiate_vnf_req
 from tacker.tests import constants
+from tacker.tests import uuidsentinel
 from tacker.vnfm.lcm_user_data import utils
 
 default_initial_param_dict = {
@@ -198,3 +200,24 @@ class TestUtils(testtools.TestCase):
         inst_req_info.ext_virtual_links = None
         cpd_vl_dict = utils.create_cpd_vl_dict(base_hot_dict, inst_req_info)
         self.assertEqual({}, cpd_vl_dict)
+
+    def test_create_desired_capacity_dict(self):
+        base_hot_dict = {}
+        vnfd_dict = {}
+        base_hot_dict['heat_template'] = self._read_file(
+            "hot_lcm_user_data_with_scale.yaml")
+        expected_desired_capaity = {'VDU1_scale': 1}
+        vnfd_dict = self._read_file('vnf_vnfd_dict_scale.yaml')
+        s_status = {"aspect_id": "VDU1_scale", "scale_level": 0}
+        scale_status = objects.ScaleInfo(**s_status)
+        instantiated_vnf_info = {
+            'flavour_id': uuidsentinel.flavour_id,
+            'vnf_state': 'STARTED',
+            'instance_id': '',
+            "scale_status": [scale_status]
+        }
+        inst_req_info = objects.InstantiatedVnfInfo(**instantiated_vnf_info)
+
+        actual_desired_capacity = utils.get_desired_capacity_dict(
+            base_hot_dict, vnfd_dict, inst_req_info)
+        self.assertEqual(actual_desired_capacity, expected_desired_capaity)

tacker/vnflcm/vnflcm_driver.py

@@ -1180,8 +1180,9 @@ class VnfLcmDriver(abstract_driver.VnfInstanceAbstractDriver):
         # action_driver
         LOG.debug("vnf_info['vnfd']['attributes'] %s",
         vnf_info['vnfd']['attributes'])
-        self.scale(context, vnf_info, scale_vnf_request,
-                   vim_connection_info, scale_name_list, grp_id)
+        self.scale(context, vnf_info, vnf_instance,
+             scale_vnf_request, vim_connection_info,
+             scale_name_list, grp_id)
 
     @log.log
     @revert_to_error_scale
@@ -1241,6 +1242,7 @@ class VnfLcmDriver(abstract_driver.VnfInstanceAbstractDriver):
             self,
             context,
             vnf_info,
+            vnf_instance,
             scale_vnf_request,
             vim_connection_info,
             scale_name_list,

tacker/vnfm/infra_drivers/openstack/openstack.py

@@ -322,7 +322,7 @@ class OpenStack(abstract_driver.VnfAbstractDriver,
                     # Find existing stack
                     name_filter = None
                     if 'stack_name' in vnf['attributes'].keys():
-                        name_filter = vnf['attributes']['stack_name']
+                        name_filter = vnf['attributes']['stack_param']
                     else:
                         name_filter = (vnf['name'].replace(' ', '_')
                             + '_' + vnf['id'])
@@ -402,7 +402,6 @@ class OpenStack(abstract_driver.VnfAbstractDriver,
                     vdu_name = rsc.vdu_id
                 if not vdu_name:
                     continue
-
                 if scale_group_dict:
                     base_hot_dict, nested_hot_dict, vdu_none_flg = \
                         self._update_hot_available_scale(
@@ -1458,6 +1457,64 @@ class OpenStack(abstract_driver.VnfAbstractDriver,
             for name, value in nested_hot_dict.items():
                 files_dict[name] = self._format_base_hot(value)
             stack_update_param['files'] = files_dict
+        additional_param = inst_vnf_info.additional_params
+        if additional_param is not None:
+            param = yaml.safe_load(vnf_dict['attributes']['stack_name'])
+            vnf_instance = vnf_instance
+            lcm_user_data_path = None
+            lcm_user_data_class = None
+            lcm_user_data_path = additional_param.get(
+                'lcm-operation-user-data')
+            lcm_user_data_class = additional_param.get(
+                'lcm-operation-user-data-class')
+            LOG.debug('UserData path: %s', lcm_user_data_path)
+            LOG.debug('UserData class: %s', lcm_user_data_class)
+            vnf_pack_path = vnflcm_utils._get_vnf_package_path(
+                context, vnf_dict['vnfd_id'])
+            LOG.debug('VNF package path: %s', vnf_pack_path)
+            lcm_user_data_module = os.path.splitext(
+                os.path.basename(lcm_user_data_path))[0]
+            LOG.debug('UserData module name: %s', lcm_user_data_module)
+            try:
+                spec = importlib.util.spec_from_file_location(
+                    lcm_user_data_module,
+                    vnf_pack_path + '/' + lcm_user_data_path)
+                lcm_user_module = importlib.util.module_from_spec(spec)
+                spec.loader.exec_module(lcm_user_module)
+                LOG.debug('lcm_user_module: %s', lcm_user_module)
+            except Exception:
+                error_reason = _(
+                    "failed to get UserData path based on "
+                    "lcm-operation-user-data from additionalParams.")
+                raise vnfm.LCMUserDataFailed(reason=error_reason)
+            try:
+                lcm_user_class = getattr(lcm_user_module, lcm_user_data_class)
+                user_method_heal = getattr(lcm_user_class, "heal", None)
+            except Exception:
+                error_reason = _(
+                    "failed to get UserData class based on "
+                    "lcm-operation-user-data-class from additionalParams.")
+                raise vnfm.LCMUserDataFailed(reason=error_reason)
+            LOG.debug('Check target method: {}'.format(user_method_heal))
+            if callable(user_method_heal):
+                LOG.debug('The above is callable')
+                if base_hot_dict is None:
+                    error_reason = _("failed to get Base HOT.")
+                    raise vnfm.LCMUserDataFailed(reason=error_reason)
+                if base_hot_dict is None:
+                    nested_hot_dict = {}
+                param_base_hot_dict = copy.deepcopy(nested_hot_dict)
+                param_base_hot_dict['heat_template'] = base_hot_dict
+                vnfd_dict = yaml.safe_load(
+                    vnf_dict['vnfd']['attributes']['vnfd_' +
+                        inst_vnf_info.flavour_id])
+                vnfc_resource_info = \
+                    self._get_vnfc_resources_from_heal_request(
+                        inst_vnf_info, heal_vnf_request)
+                updated_stack_param = user_method_heal(
+                    param_base_hot_dict, vnfd_dict, heal_vnf_request,
+                    vnf_instance, inst_vnf_info, param, vnfc_resource_info)
+                stack_param = {**updated_stack_param}
 
         if stack_param:
             stack_update_param['parameters'] = stack_param
@@ -1848,7 +1905,7 @@ class OpenStack(abstract_driver.VnfAbstractDriver,
 
     @log.log
     def scale_in_reverse(self, context, plugin, auth_attr, vnf_info,
-                         scale_vnf_request, region_name,
+                         vnf_instance, scale_vnf_request, region_name,
                          scale_name_list, grp_id):
         heatclient = hc.HeatClient(auth_attr, region_name)
         if grp_id:
@@ -1858,13 +1915,75 @@ class OpenStack(abstract_driver.VnfAbstractDriver,
                     resource_name=name,
                     mark_unhealthy=True,
                     resource_status_reason='Scale')
-        paramDict = {}
-        scale_json = vnf_info['attributes']['scale_group']
-        scaleGroupDict = jsonutils.loads(scale_json)
-        for name, value in scaleGroupDict['scaleGroupDict'].items():
-            paramDict[name + '_desired_capacity'] = value['default']
-        paramDict[scale_vnf_request.aspect_id + '_desired_capacity'] = \
-            vnf_info['res_num']
+        inst_vnf_info = vnf_instance.instantiated_vnf_info
+        vnf = vnf_info
+        stack_param = {}
+        updated_stack_param = {}
+        if 'stack_param' in vnf['attributes'].keys():
+            param = yaml.safe_load(vnf['attributes']['stack_param'])
+            additional_param = inst_vnf_info.additional_params
+            if additional_param is not None:
+                lcm_user_data_path = None
+                lcm_user_data_class = None
+                lcm_user_data_path = additional_param.get(
+                    'lcm-operation-user-data')
+                lcm_user_data_class = additional_param.get(
+                    'lcm-operation-user-data-class')
+                LOG.debug('UserData path: %s', lcm_user_data_path)
+                LOG.debug('UserData class: %s', lcm_user_data_class)
+                vnf_pack_path = vnflcm_utils._get_vnf_package_path(
+                    context, vnf['vnfd_id'])
+                LOG.debug('VNF package path: %s', vnf_pack_path)
+                lcm_user_data_module = os.path.splitext(
+                    os.path.basename(lcm_user_data_path))[0]
+                LOG.debug('UserData module name: %s', lcm_user_data_module)
+                try:
+                    spec = importlib.util.spec_from_file_location(
+                        lcm_user_data_module,
+                        vnf_pack_path + '/' + lcm_user_data_path)
+                    lcm_user_module = importlib.util.module_from_spec(spec)
+                    spec.loader.exec_module(lcm_user_module)
+                    LOG.debug('lcm_user_module: %s', lcm_user_module)
+                except Exception:
+                    error_reason = _(
+                        "failed to get UserData path based on "
+                        "lcm-operation-user-data from additionalParams.")
+                    raise vnfm.LCMUserDataFailed(reason=error_reason)
+                try:
+                    lcm_user_class = getattr(lcm_user_module,
+                        lcm_user_data_class)
+                    user_method_scale = getattr(lcm_user_class, "scale", None)
+                except Exception:
+                    error_reason = _(
+                        "failed to get UserData class based on "
+                        "lcm-operation-user-data-class from additionalParams.")
+                    raise vnfm.LCMUserDataFailed(reason=error_reason)
+
+                if callable(user_method_scale):
+                    base_hot_dict, nested_hot_dict = \
+                        vnflcm_utils._get_base_nest_hot_dict(
+                            context, inst_vnf_info.flavour_id,
+                            vnf_instance.vnfd_id)
+                    if base_hot_dict is None:
+                        error_reason = _("failed to get Base HOT.")
+                        raise vnfm.LCMUserDataFailed(reason=error_reason)
+                    if base_hot_dict is None:
+                        nested_hot_dict = {}
+                    param_base_hot_dict = copy.deepcopy(nested_hot_dict)
+                    param_base_hot_dict['heat_template'] = base_hot_dict
+                    vnfd_dict = yaml.safe_load(
+                        vnf['vnfd']['attributes']['vnfd_' +
+                        inst_vnf_info.flavour_id])
+                    updated_stack_param = user_method_scale(
+                        param_base_hot_dict, vnfd_dict, scale_vnf_request,
+                        vnf_instance, inst_vnf_info, param, vnf['res_num'])
+                    stack_param = {**stack_param, **updated_stack_param}
+                else:
+                    stack_param = {**stack_param, **param}
+            else:
+                stack_param = {**stack_param, **param}
+
+        paramDict = stack_param
         stack_update_param = {
             'parameters': paramDict,
             'existing': True}

tacker/vnfm/lcm_user_data/utils.py

@@ -14,8 +14,9 @@
 import copy
 
 from oslo_log import log as logging
+from oslo_serialization import jsonutils
 from tacker.common.utils import MemoryUnit
-
+from tacker.tosca import utils as tosca_utils
 
 """Define util functions that can be used in UserData.
 
@@ -412,3 +413,85 @@ def _create_fixed_ips_list(ext_cp):
                     fixed_ips_lst.append(fixed_ips)
 
     return fixed_ips_lst
+
+
+def _create_scale_group_dict(base_hot_dict, vnfd_dict, inst_req_info):
+
+    base_hot = base_hot_dict['heat_template']
+    LOG.debug("base_hot: %s", base_hot)
+
+    scaling_group_dict = {}
+    for name, rsc in base_hot.get('resources').items():
+        if rsc['type'] == 'OS::Heat::AutoScalingGroup':
+            key_name = name.replace('_group', '')
+            scaling_group_dict[key_name] = name
+    LOG.debug("scaling_group_dict: %s", scaling_group_dict)
+
+    if scaling_group_dict:
+        vnf = {'attributes': {'scaling_group_names':
+            jsonutils.dump_as_bytes(scaling_group_dict)}}
+        scale_group_dict = tosca_utils.get_scale_group(
+            vnf, vnfd_dict, inst_req_info)
+        LOG.debug("scale_group_dict: %s", scale_group_dict)
+        return scale_group_dict
+    else:
+        LOG.debug("no scale_group_dict")
+        return {}
+
+
+def create_desired_capacity_dict(base_hot_dict, vnfd_dict, inst_req_info):
+    """Create a dict containing information about desired capacity.
+
+    :param base_hot_dict: dict(Base HOT dict format)
+    :param vnfd_dict: dict(VNFD dict format)
+    :param inst_req_info: dict(Instantiation request information format)
+    :return: dict(Scaling aspect name, Desired capacity value)
+    """
+    scale_group_dict = _create_scale_group_dict(
+        base_hot_dict, vnfd_dict, inst_req_info)
+
+    param_dict = {}
+    if scale_group_dict.get('scaleGroupDict'):
+        for name, value in scale_group_dict['scaleGroupDict'].items():
+            param_dict[name] = value['default']
+
+    LOG.info("desired_capacity dict: %s", param_dict)
+    return param_dict
+
+
+def _calc_desired_capacity(inst_vnf_info, name, value):
+
+    for scale_status in inst_vnf_info.scale_status:
+        if scale_status.aspect_id == name:
+            LOG.debug("scale_level of %s: %d",
+                 name, scale_status.scale_level)
+            increase = value['num'] * scale_status.scale_level
+            desired_capacity = value['initialNum'] + increase
+            LOG.debug("desired_capacity: %d", desired_capacity)
+            return desired_capacity
+
+    LOG.debug("scale_level of %s: None", name)
+    return None
+
+
+def get_desired_capacity_dict(base_hot_dict, vnfd_dict, inst_vnf_info):
+    """Get a dict containing information about desired capacity.
+
+    :param base_hot_dict: dict(Base HOT dict format)
+    :param vnfd_dict: dict(VNFD dict format)
+    :param inst_vnf_info: dict(Instantiated VNF Info dict format)
+    :return: dict(Scaling aspect name, Desired capacity value)
+    """
+    scale_group_dict = _create_scale_group_dict(
+        base_hot_dict, vnfd_dict, {})
+
+    param_dict = {}
+    if scale_group_dict.get('scaleGroupDict'):
+        for name, value in scale_group_dict['scaleGroupDict'].items():
+            desired_capacity = _calc_desired_capacity(
+                inst_vnf_info, name, value)
+            if desired_capacity is not None:
+                param_dict[name] = desired_capacity
+
+    LOG.info("desired_capacity dict: %s", param_dict)
+    return param_dict