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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 datetime import datetime
import json
from pymzn import cbc
from pymzn import chuffed
from pymzn import gecode
from pymzn import minizinc
from pymzn import or_tools
from pymzn import Status
from osdf.utils.file_utils import delete_file_folder
error_status_map = {
Status.INCOMPLETE: "incomplete",
Status.COMPLETE: "complete",
Status.UNSATISFIABLE: "unsatisfiable",
Status.UNKNOWN: "unknown",
Status.UNBOUNDED: "unbounded",
Status.UNSATorUNBOUNDED: "unsat_or_unbounded",
Status.ERROR: "error"
}
solver_dict = {
'cbc': cbc,
'geocode': gecode,
'chuffed': chuffed,
'cp': chuffed,
'or_tools': or_tools
}
def map_status(status):
return error_status_map.get(status, "failed")
def solve(request_json, mzn_content):
"""Given the request and minizinc content. Translates the json request to the format minizinc understands
return: returns the optimized solution.
"""
req_info = request_json['requestInfo']
opt_info = request_json['optimInfo']
try:
mzn_solution = mzn_solver(mzn_content, opt_info)
response = {
'transactionId': req_info['transactionId'],
'requestID': req_info['requestID'],
'requestStatus': 'done',
'statusMessage': map_status(mzn_solution.status),
'solutions': mzn_solution[0] if mzn_solution else {}
}
return 200, json.dumps(response)
except Exception as e:
response = {
'transactionId': req_info['transactionId'],
'requestID': req_info['requestID'],
'requestStatus': 'failed',
'statusMessage': 'Failed due to {}'.format(e)
}
return 400, json.dumps(response)
def mzn_solver(mzn_content, opt_info):
"""Calls the minizinc optimizer.
"""
args = opt_info['solverArgs']
solver = get_mzn_solver(args.pop('solver'))
mzn_opts = dict()
try:
file_name = persist_opt_data(opt_info)
mzn_opts.update(args)
return minizinc(mzn_content, file_name, **mzn_opts, solver=solver)
finally:
delete_file_folder(file_name)
def persist_opt_data(opt_info):
"""Persist the opt data, if included as part of the request.
return: file_name path of the optim_data
returns None if no optData is part of the request
"""
file_name = None
if 'optData' in opt_info:
if opt_info['optData'].get('json'):
data_content = json.dumps(opt_info['optData']['json'])
file_name = '/tmp/optim_engine_{}.json'.format(datetime.timestamp(datetime.now()))
persist_data(data_content, file_name)
elif opt_info['optData'].get('text'):
data_content = opt_info['optData']['text']
file_name = '/tmp/optim_engine_{}.dzn'.format(datetime.timestamp(datetime.now()))
persist_data(data_content, file_name)
return file_name
def persist_data(data_content, file_name):
"""Save the dzn data into a file
"""
with open(file_name, "wt") as data:
data.write(data_content)
def get_mzn_solver(solver):
"""Returns a solver type object for minizinc optimizers
solver: solver that is part of the request
return: solver mapped object
"""
return solver_dict.get(solver)
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