Add support to process NSI selection request

Issue-ID: OPTFRA-802
Signed-off-by: dhebeha <dhebeha.mj71@wipro.com>
Signed-off-by: krishnaa96 <krishna.moorthy6@wipro.com>
Change-Id: I85d951061abc697714425bd223b89102d4f2ede9

2 files changed, 181 insertions, 222 deletions

diff --git a/apps/slice_selection/optimizers/conductor/remote_opt_processor.py b/apps/slice_selection/optimizers/conductor/remote_opt_processor.py
index 40638fc..c1c6980 100644
--- a/apps/slice_selection/optimizers/conductor/remote_opt_processor.py
+++ b/apps/slice_selection/optimizers/conductor/remote_opt_processor.py
@@ -20,92 +20,106 @@
 Module for processing slice selection request
 """
 
-import json
-import traceback
 from requests import RequestException
+from threading import Thread
+import traceback
 
-from apps.slice_selection.optimizers.conductor.response_processor \
-    import conductor_response_processor, conductor_error_response_processor, solution_with_only_slice_profile, get_nsi_selection_response
+from apps.slice_selection.optimizers.conductor.response_processor import ResponseProcessor
 from osdf.adapters.conductor import conductor
 from osdf.adapters.policy.interface import get_policies
-from osdf.adapters.policy.utils import group_policies_gen
-from osdf.logging.osdf_logging import error_log, debug_log
+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 osdf.utils.mdc_utils import mdc_from_json
 
 
-def process_nsi_selection_opt(request_json, osdf_config):
-    """Process the nsi selection request from API layer
-        :param request_json: api request
-        :param policies: flattened policies corresponding to this request
-        :param osdf_config: configuration specific to OSDF app
-        :return: response as a dictionary
-        """
-    req_info = request_json['requestInfo']
-    try:
-        mdc_from_json(request_json)
-
-        overall_recommendations = dict()
-        nst_info_map = dict()
-        new_nsi_solutions = list()
-        for nst_info in request_json["NSTInfoList"]:
-            nst_name = nst_info["modelName"]
-            nst_info_map[nst_name] =  {"NSTName": nst_name,
-                                                    "UUID": nst_info["modelVersionId"],
-                                                    "invariantUUID": nst_info["modelInvariantId"]}
-
-            if request_json["serviceProfile"]["resourceSharingLevel"] == "non-shared":
-                new_nsi_solution = solution_with_only_slice_profile(request_json['serviceProfile'], nst_info_map.get(nst_name))
-                new_nsi_solutions.append(new_nsi_solution)
+class SliceSelectionOptimizer(Thread):
+    def __init__(self, osdf_config, slice_config, request_json, model_type):
+        self.osdf_config = osdf_config
+        self.slice_config = slice_config
+        self.request_json = request_json
+        self.model_type = model_type
+        self.response_processor = ResponseProcessor(request_json['requestInfo'], slice_config)
+
+    def run(self):
+        self.process_slice_selection_opt()
+
+    def process_slice_selection_opt(self):
+        """Process the slice selection request from the API layer"""
+        req_info = self.request_json['requestInfo']
+        rc = get_rest_client(self.request_json, service='so')
+
+        try:
+            if self.model_type == 'NSSI' \
+                    and self.request_json['sliceProfile'].get('resourceSharingLevel', "") == 'not-shared':
+                final_response = self.response_processor.get_slice_selection_response([])
+
             else:
-                policy_request_json = request_json.copy()
-                policy_request_json['serviceInfo']['serviceName'] = nst_name
-                policies = get_policies(policy_request_json, "slice_selection")
-
-                demands = get_slice_demands(nst_name, policies, osdf_config.core)
-
-                request_parameters = request_json.get('serviceProfile',{})
-                service_info = {}
-                req_info['numSolutions'] = 'all'
-                try:
-                    resp = conductor.request(req_info, demands, request_parameters, service_info, False,
-                                             osdf_config, policies)
-                except RequestException as e:
-                    resp = e.response.json()
-                    error = resp['plans'][0]['message']
-                    error_log.error('Error from conductor {}'.format(error))
-                debug_log.debug("Response from conductor {}".format(str(resp)))
-                overall_recommendations[nst_name] = resp["plans"][0].get("recommendations")
-
-        if request_json["serviceProfile"]["resourceSharingLevel"] == "non-shared":
-            solutions = dict()
-            solutions['newNSISolutions'] = new_nsi_solutions
-            solutions['sharedNSISolutions'] = []
-            return get_nsi_selection_response(req_info, solutions)
-        else:
-            return conductor_response_processor(overall_recommendations, nst_info_map, req_info, request_json["serviceProfile"])
-    except Exception as ex:
-        error_log.error("Error for {} {}".format(req_info.get('requestId'),
-                                                 traceback.format_exc()))
-        error_message = str(ex)
-        return conductor_error_response_processor(req_info, error_message)
-
-
-def get_slice_demands(model_name, policies, config):
-    """
-    :param model_name: model name of the slice
-    :param policies: flattened polcies corresponding to the request
-    :param config: configuration specific to OSDF app
-    :return: list of demands for the request
-    """
-    group_policies = group_policies_gen(policies, config)
-    subscriber_policy_list = group_policies["onap.policies.optimization.service.SubscriberPolicy"]
-    slice_demands = list()
-    for subscriber_policy in subscriber_policy_list:
-        policy_properties = subscriber_policy[list(subscriber_policy.keys())[0]]['properties']
-        if model_name in policy_properties["services"]:
-            for subnet in policy_properties["properties"]["subscriberName"]:
-                slice_demand = dict()
-                slice_demand["resourceModuleName"] = subnet
-                slice_demand['resourceModelInfo'] = {}
-                slice_demands.append(slice_demand)
-    return slice_demands
+                final_response = self.do_slice_selection()
+
+        except Exception as ex:
+            error_log.error("Error for {} {}".format(req_info.get('requestId'),
+                                                     traceback.format_exc()))
+            error_message = str(ex)
+            final_response = self.response_processor.process_error_response(error_message)
+
+        try:
+            rc.request(json=final_response, noresponse=True)
+        except RequestException:
+            error_log.error("Error sending asynchronous notification for {} {}".format(req_info['request_id'],
+                                                                                       traceback.format_exc()))
+
+    def do_slice_selection(self):
+        req_info = self.request_json['requestInfo']
+        app_info = self.slice_config['app_info'][self.model_type]
+        mdc_from_json(self.request_json)
+        requirements = self.request_json.get(app_info['requirements_field'], {})
+        model_info = self.request_json.get(app_info['model_info'])
+        model_name = model_info['name']
+        policies = self.get_app_policies(model_name, app_info['app_name'])
+        request_parameters = self.get_request_parameters(requirements)
+
+        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']
+            error_log.error('Error from conductor {}'.format(error))
+            return self.response_processor.process_error_response(error)
+
+        debug_log.debug("Response from conductor {}".format(str(resp)))
+        recommendations = resp["plans"][0].get("recommendations")
+        subnets = [subnet['domainType'] for subnet in self.request_json['subnetCapabilities']] \
+            if self.request_json.get('subnetCapabilities') else []
+        return self.response_processor.process_response(recommendations, model_info, subnets)
+
+    def get_request_parameters(self, requirements):
+        camel_to_snake = self.slice_config['attribute_mapping']['camel_to_snake']
+        request_params = {camel_to_snake[key]: value for key, value in requirements.items()}
+        subnet_capabilities = self.request_json.get('subnetCapabilities')
+        if subnet_capabilities:
+            for subnet_capability in subnet_capabilities:
+                domain_type = f"{subnet_capability['domainType'].lower().replace('-', '_')}_"
+                capability_details = subnet_capability['capabilityDetails']
+                for key, value in capability_details.items():
+                    request_params[f"{domain_type}{camel_to_snake[key]}"] = value
+        return request_params
+
+    def get_app_policies(self, model_name, app_name):
+        policy_request_json = self.request_json.copy()
+        policy_request_json['serviceInfo'] = {'serviceName': model_name}
+        if 'preferReuse' in self.request_json:
+            policy_request_json['preferReuse'] = "reuse" if self.request_json['preferReuse'] else "create_new"
+        return get_policies(policy_request_json, app_name)
diff --git a/apps/slice_selection/optimizers/conductor/response_processor.py b/apps/slice_selection/optimizers/conductor/response_processor.py
index a9bdad0..71a350f 100644
--- a/apps/slice_selection/optimizers/conductor/response_processor.py
+++ b/apps/slice_selection/optimizers/conductor/response_processor.py
@@ -20,144 +20,89 @@
 Module for processing response from conductor for slice selection
 """
 
-from osdf.logging.osdf_logging import debug_log
-
-
-SLICE_PROFILE_FIELDS = {"latency":"latency", "max_number_of_ues":"maxNumberOfUEs", "coverage_area_ta_list": "coverageAreaTAList",
-                        "ue_mobility_level":"uEMobilityLevel", "resource_sharing_level":"resourceSharingLevel", "exp_data_rate_ul": "expDataRateUL",
-                        "exp_data_rate_dl":"expDataRateDL", "area_traffic_cap_ul":"areaTrafficCapUL", "area_traffic_cap_dl": "areaTrafficCapDL",
-                        "activity_factor":"activityFactor", "e2e_latency":"e2eLatency", "jitter":"jitter", "survival_time": "survivalTime",
-                        "exp_data_rate":"expDataRate", "payload_size":"payloadSize", "traffic_density":"trafficDensity", "conn_density":"connDensity",
-                        "reliability":"reliability", "service_area_dimension":"serviceAreaDimension", "cs_availability": "csAvailability"}
-
-
-def conductor_response_processor(overall_recommendations, nst_info_map, request_info, service_profile):
-    """Process conductor response to form the response for the API request
-        :param overall_recommendations: recommendations from conductor
-        :param nst_info_map: NST info from the request
-        :param request_info: request info
-        :return: response json as a dictionary
-    """
-    shared_nsi_solutions = list()
-    new_nsi_solutions = list()
-    for nst_name, recommendations in overall_recommendations.items():
-        if  not (recommendations):
-            new_nsi_solution = solution_with_only_slice_profile(service_profile, nst_info_map.get(nst_name))
-            new_nsi_solutions.append(new_nsi_solution)
-            continue
-
-        for recommendation in recommendations:
-            nsi_set = set(values['candidate']['nsi_id'] for key, values in recommendation.items())
-            if len(nsi_set) == 1:
-                nsi_id = nsi_set.pop()
-                candidate = list(recommendation.values())[0]['candidate']
-                debug_log.debug("The NSSIs in the solution belongs to the same NSI {}"
-                                .format(nsi_id))
-                shared_nsi_solution = dict()
-                shared_nsi_solution["NSIId"] = nsi_id
-                shared_nsi_solution["NSIName"] = candidate.get('nsi_name')
-                shared_nsi_solution["UUID"] = candidate.get('nsi_model_version_id')
-                shared_nsi_solution["invariantUUID"] = candidate.get('nsi_model_invariant_id')
-
-                nssi_info_list = get_nssi_solutions(recommendation)
-                nssis = list()
-                for nssi_info in nssi_info_list:
-                    nssi = dict()
-                    nssi["NSSIId"] = nssi_info.get("NSSISolution").get("NSSIId")
-                    nssi["NSSIName"] = nssi_info.get("NSSISolution").get("NSSIName")
-                    nssi["UUID"] = ""
-                    nssi["invariantUUID"] = ""
-                    nssi_info.get("sliceProfile").update({"domainType":"cn"})
-                    nssi["sliceProfile"] = [nssi_info.get("sliceProfile")]
-                    nssis.append(nssi)
-
-                shared_nsi_solution["NSSIs"] = nssis
-                shared_nsi_solutions.append(shared_nsi_solution)
-            else:
-                nssi_solutions = get_nssi_solutions(recommendation)
-                new_nsi_solution = dict()
-                new_nsi_solution['matchLevel'] = ""
-                new_nsi_solution['NSTInfo'] = nst_info_map.get(nst_name)
-                new_nsi_solution['NSSISolutions'] = nssi_solutions
-                new_nsi_solutions.append(new_nsi_solution)
-
-    solutions = dict()
-    solutions['sharedNSISolutions'] = shared_nsi_solutions
-    solutions['newNSISolutions'] = new_nsi_solutions
-    return get_nsi_selection_response(request_info, solutions)
-
-
-def solution_with_only_slice_profile(service_profile, nst_info):
-    nssi_solutions = get_slice_profile_from_service_profile(service_profile)
-    new_nsi_solution = dict()
-    new_nsi_solution['matchLevel'] = ""
-    new_nsi_solution['NSTInfo'] = nst_info
-    new_nsi_solution['NSSISolutions'] = nssi_solutions
-    return new_nsi_solution
-
-def conductor_error_response_processor(request_info, error_message):
-    """Form response message from the error message
-        :param request_info: request info
-        :param error_message: error message while processing the request
-        :return: response json as dictionary
-    """
-    return {'requestId': request_info['requestId'],
-            'transactionId': request_info['transactionId'],
-            'requestStatus': 'error',
-            'statusMessage': error_message}
-
-
-def get_slice_profile_from_service_profile(service_profile):
-    nssi_solutions = list()
-    service_profile["domainType"] = "cn"
-    nssi_solution = {"sliceProfile": service_profile}
-    nssi_solutions.append(nssi_solution)
-    return nssi_solutions
-
-
-def get_nssi_solutions(recommendation):
-    """Get nssi solutions from recommendation
-        :param recommendation: recommendation from conductor
-        :return: new nssi solutions list
-    """
-    nssi_solutions = list()
-
-    for nsst_name, nsst_rec in recommendation.items():
-        candidate = nsst_rec['candidate']
-        nssi_info, slice_profile = get_solution_from_candidate(candidate)
-        nsst_info = {"NSSTName": nsst_name}
-        nssi_solution = {"sliceProfile": slice_profile,
-                         "NSSTInfo": nsst_info,
-                         "NSSISolution": nssi_info}
-        nssi_solutions.append(nssi_solution)
-    return nssi_solutions
-
-
-def get_solution_from_candidate(candidate):
-    """Get nssi info from candidate
-        :param candidate: Candidate from the recommendation
-        :return: nssi_info and slice profile derived from candidate
-    """
-    slice_profile = dict()
-    nssi_info = {"NSSIName": candidate['instance_name'],
-                 "NSSIId": candidate['candidate_id']}
-
-    for field in SLICE_PROFILE_FIELDS:
-        if candidate[field]:
-            slice_profile[SLICE_PROFILE_FIELDS[field]] = candidate[field]
-
-    return nssi_info, slice_profile
-
-
-def get_nsi_selection_response(request_info, solutions):
-    """Get NSI selection response from final solution
-        :param request_info: request info
-        :param solutions: final solutions
-        :return: NSI selection response to send back as dictionary
-    """
-    return {'requestId': request_info['requestId'],
-            'transactionId': request_info['transactionId'],
-            'requestStatus': 'completed',
-            'statusMessage': '',
-            'solutions': solutions}
-
+import re
+
+
+class ResponseProcessor(object):
+    def __init__(self, request_info, slice_config):
+        self.request_info = request_info
+        self.slice_config = slice_config
+
+    def process_response(self, recommendations, model_info, subnets):
+        """Process conductor response to form the response for the API request
+
+            :param recommendations: recommendations from conductor
+            :param model_info: model info from the request
+            :param subnets: list of subnets
+            :return: response json as a dictionary
+        """
+        if not recommendations:
+            return self.get_slice_selection_response([])
+        model_name = model_info['name']
+        solutions = [self.get_solution_from_candidate(rec[model_name]['candidate'], model_info, subnets)
+                     for rec in recommendations]
+        return self.get_slice_selection_response(solutions)
+
+    def get_solution_from_candidate(self, candidate, model_info, subnets):
+        if candidate['inventory_type'] == 'nssi':
+            return {
+                'UUID': model_info['UUID'],
+                'invariantUUID': model_info['invariantUUID'],
+                'NSSIName': candidate['instance_name'],
+                'NSSIId': candidate['instance_id']
+            }
+
+        elif candidate['inventory_type'] == 'nsi':
+            return {
+                'existingNSI': True,
+                'sharedNSISolution': {
+                    'UUID': model_info['UUID'],
+                    'invariantUUID': model_info['invariantUUID'],
+                    'NSIName': candidate['instance_name'],
+                    'NSIId': candidate['instance_id']
+                }
+            }
+
+        elif candidate['inventory_type'] == 'slice_profiles':
+            return {
+                'existingNSI': False,
+                'newNSISolution': {
+                    'slice_profiles': self.get_slice_profiles_from_candidate(candidate, subnets)
+                }
+            }
+
+    def get_slice_profiles_from_candidate(self, candidate, subnets):
+        slice_profiles = []
+        for subnet in subnets:
+            slice_profile = {self.get_profile_attribute(k, subnet): v for k, v in candidate.items()
+                             if k.startswith(subnet)}
+            slice_profile['domainType'] = subnet
+            slice_profiles.append(slice_profile)
+        return slice_profiles
+
+    def get_profile_attribute(self, attribute, subnet):
+        snake_to_camel = self.slice_config['attribute_mapping']['snake_to_camel']
+        return snake_to_camel[re.sub(f'^{subnet}_', '', attribute)]
+
+    def process_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_slice_selection_response(self, solutions):
+        """Get NSI selection response from final solution
+
+            :param solutions: final solutions
+            :return: NSI selection response to send back as dictionary
+        """
+        return {'requestId': self.request_info['requestId'],
+                'transactionId': self.request_info['transactionId'],
+                'requestStatus': 'completed',
+                'statusMessage': '',
+                'solutions': solutions}