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# -------------------------------------------------------------------------
# Copyright (c) 2020 AT&T 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.
#
# -------------------------------------------------------------------------
#
from flask import Response
from osdf.operation.exceptions import BusinessException
from .model_api import get_model_data
from .models.api.optim_request import OptimizationAPI
from .solvers.mzn.mzn_solver import solve as mzn_solve
from .solvers.py.py_solver import solve as py_solve
def is_valid_optim_request(request_json):
# Method to check whether the requestinfo/optimizer value is valid.
opt_info = request_json['optimInfo']
if not opt_info.get('modelId'):
if not opt_info.get('modelContent') or not opt_info.get('solver'):
raise BusinessException('modelContent and solver needs to be populated if model_id is not set')
if not opt_info.get('optData'):
raise BusinessException('optimInfo.optData needs to be populated to solve for a problem')
return True
def validate_request(request_json):
OptimizationAPI(request_json).validate()
if not is_valid_optim_request(request_json):
raise BusinessException('Invalid optim request ')
return True
def process_request(request_json):
response_code, response_message = run_optimizer(request_json)
response = Response(response_message, content_type='application/json; charset=utf-8')
response.headers.add('content-length', len(response_message))
response.status_code = response_code
return response
def run_optimizer(request_json):
validate_request(request_json)
model_content, solver = get_model_content(request_json)
if solver == 'mzn':
return mzn_solve(request_json, model_content)
elif solver == 'py':
return py_solve(request_json, model_content)
raise BusinessException('Unsupported optimization solver requested {} '.format(solver))
def get_model_content(request_json):
model_id = request_json['optimInfo'].get('modelId')
if model_id:
status, data = get_model_data(model_id)
if status == 200:
model_content = data[1]
solver = data[3]
else:
raise BusinessException('model_id [{}] not found in the model database'.format(model_id))
else:
model_content = request_json['optimInfo']['modelContent']
solver = request_json['optimInfo']['solver']
return model_content, solver
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