new API selectNSST for slicing use case3.0.8

Issue-ID: OPTFRA-1122
Signed-off-by: Aleem Raja <aleem.raja@t-systems.com>
Change-Id: Ib027bfe49948180a1808b5507dc1647ba05c6e0d

1 files changed, 155 insertions, 0 deletions

diff --git a/apps/nsst/optimizers/nsst_select_processor.py b/apps/nsst/optimizers/nsst_select_processor.py
new file mode 100644
index 0000000..90f40f2
--- /dev/null
+++ b/apps/nsst/optimizers/nsst_select_processor.py
@@ -0,0 +1,155 @@
+# -------------------------------------------------------------------------
+#   Copyright (c) 2020 Huawei Intellectual Property
+#
+#   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.
+#
+# -------------------------------------------------------------------------
+
+"""
+This application generates NST SELECTION API calls using the information received from SO
+"""
+import os
+from osdf.adapters.conductor import conductor
+from osdf.adapters.policy.interface import get_policies
+from osdf.logging.osdf_logging import debug_log
+from osdf.logging.osdf_logging import error_log
+from osdf.utils.interfaces import get_rest_client
+from requests import RequestException
+from threading import Thread
+import traceback
+BASE_DIR = os.path.dirname(__file__)
+
+
+# This is the class for NST Selection
+
+
+class NsstSelection(Thread):
+
+    def __init__(self, osdf_config, request_json):
+        super().__init__()
+        self.osdf_config = osdf_config
+        self.request_json = request_json
+        self.request_info = self.request_json['requestInfo']
+        self.request_info['numSolutions'] = 1
+
+    def run(self):
+        self.process_nsst_selection()
+
+    def process_nsst_selection(self):
+        """Process a PCI request from a Client (build config-db, policy and  API call, make the call, return result)
+
+            :param req_object: Request parameters from the client
+            :param osdf_config: Configuration specific to OSDF application (core + deployment)
+            :return: response from NST Opt
+        """
+        try:
+            rest_client = get_rest_client(self.request_json, service='so')
+            solution = self.get_nsst_solution()
+        except Exception as err:
+            error_log.error("Error for {} {}".format(self.request_info.get('requestId'),
+                                                     traceback.format_exc()))
+            error_message = str(err)
+            solution = self.error_response(error_message)
+
+        try:
+            rest_client.request(json=solution, noresponse=True)
+        except RequestException:
+            error_log.error("Error sending asynchronous notification for {} {}".
+                            format(self.request_info['requestId'], traceback.format_exc()))
+
+    def get_nsst_solution(self):
+        """the file is in the same folder for now will move it to the conf folder of the has once its
+
+           integrated there...
+        """
+        req_info = self.request_json['requestInfo']
+        requirements = self.request_json['sliceProfile']
+        model_name = "nsst"
+        policies = self.get_app_policies(model_name, "nsst_selection")
+        conductor_response = self.get_conductor(req_info, requirements, policies, model_name)
+        return conductor_response
+
+    def get_nsst_selection_response(self, solutions):
+        """Get NST selection response from final solution
+
+            :param solutions: final solutions
+            :return: NST selection response to send back as dictionary
+        """
+        return {'requestId': self.request_info['requestId'],
+                'transactionId': self.request_info['transactionId'],
+                'requestStatus': 'completed',
+                'statusMessage': '',
+                'solutions': solutions}
+
+    def error_response(self, error_message):
+        """Form response message from the error message
+
+            :param error_message: error message while processing the request
+            :return: response json as dictionary
+        """
+        return {'requestId': self.request_info['requestId'],
+                'transactionId': self.request_info['transactionId'],
+                'requestStatus': 'error',
+                'statusMessage': error_message}
+
+    def get_app_policies(self, model_name, app_name):
+        policy_request_json = self.request_json.copy()
+        policy_request_json['serviceInfo'] = {'serviceName': model_name}
+        debug_log.debug("policy_request_json {}".format(str(policy_request_json)))
+        return get_policies(policy_request_json, app_name)  # app_name: nsst_selection
+
+    def get_conductor(self, req_info, request_parameters, policies, model_name):
+        demands = [
+            {
+                "resourceModuleName": model_name,
+                "resourceModelInfo": {}
+            }
+        ]
+
+        try:
+            template_fields = {
+                'location_enabled': False,
+                'version': '2020-08-13'
+            }
+            resp = conductor.request(req_info, demands, request_parameters, {}, template_fields,
+                                     self.osdf_config, policies)
+        except RequestException as e:
+            resp = e.response.json()
+            error = resp['plans'][0]['message']
+            if "Unable to find any" in error:
+                return self.get_nsst_selection_response([])
+            error_log.error('Error from conductor {}'.format(error))
+            return self.error_response(error)
+        debug_log.debug("Response from conductor in get_conductor method {}".format(str(resp)))
+        recommendations = resp["plans"][0].get("recommendations")
+        return self.process_response(recommendations, model_name)
+
+    def process_response(self, recommendations, model_name):
+        """Process conductor response to form the response for the API request
+
+            :param recommendations: recommendations from conductor
+            :return: response json as a dictionary
+        """
+        if not recommendations:
+            return self.get_nsst_selection_response([])
+        solutions = [self.get_solution_from_candidate(rec[model_name]['candidate'])
+                     for rec in recommendations]
+        return self.get_nsst_selection_response(solutions)
+
+    def get_solution_from_candidate(self, candidate):
+        if candidate['inventory_type'] == 'nsst':
+            return {
+                'UUID': candidate['model_version_id'],
+                'invariantUUID': candidate['model_invariant_id'],
+                'NSSTName': candidate['model_name'],
+            }