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# -------------------------------------------------------------------------
# Copyright (C) 2020 Wipro Limited.
#
# 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.
#
# -------------------------------------------------------------------------
#
"""
Module for processing slice selection request
"""
from requests import RequestException
from threading import Thread
import traceback
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.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
class SliceSelectionOptimizer(Thread):
def __init__(self, osdf_config, slice_config, request_json, model_type):
super().__init__()
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', "") \
in ['not-shared', 'non-shared']:
final_response = self.response_processor.get_slice_selection_response([])
else:
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, model_info)
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 isinstance(error, list) and "Unable to find any" in error[0]:
return self.response_processor.get_slice_selection_response([])
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, self.model_type)
def get_request_parameters(self, requirements, model_info):
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']}_"
capability_details = subnet_capability['capabilityDetails']
for key, value in capability_details.items():
request_params[f"{domain_type}{camel_to_snake[key]}"] = value
request_params.update(model_info)
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 'serviceProfile' in self.request_json:
slice_scope = self.request_json['serviceProfile']['resourceSharingLevel']
if 'preferReuse' in self.request_json and slice_scope == "shared":
slice_scope = slice_scope + "," + ("reuse" if self.request_json['preferReuse'] else "create_new")
policy_request_json['slice_scope'] = slice_scope
debug_log.debug("policy_request_json {}".format(str(policy_request_json)))
return get_policies(policy_request_json, app_name)
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