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authorShankaranarayanan Puzhavakath Narayanan <snarayanan@research.att.com>2020-03-05 17:50:24 +0000
committerGerrit Code Review <gerrit@onap.org>2020-03-05 17:50:24 +0000
commitb9cbf0028fd8db0d7ab9e845acc41b9f3ecb245f (patch)
treed918418791df55e2aa7d08437f6d9e26139f95f1 /runtime/solvers/mzn/mzn_solver.py
parent2e2d7f666ad84d6fe18c86ad7718fd89f2c9448e (diff)
parentde5fdaafad9fccba0b9a7f308d72f26816dd1a0f (diff)
Merge "Adding the generic solver code"
Diffstat (limited to 'runtime/solvers/mzn/mzn_solver.py')
-rw-r--r--runtime/solvers/mzn/mzn_solver.py102
1 files changed, 102 insertions, 0 deletions
diff --git a/runtime/solvers/mzn/mzn_solver.py b/runtime/solvers/mzn/mzn_solver.py
new file mode 100644
index 0000000..cf002e7
--- /dev/null
+++ b/runtime/solvers/mzn/mzn_solver.py
@@ -0,0 +1,102 @@
+# -------------------------------------------------------------------------
+# 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.
+#
+# -------------------------------------------------------------------------
+#
+
+import json
+from datetime import datetime
+
+from pymzn import Status, minizinc, cbc, gecode, chuffed, or_tools
+
+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):
+ 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):
+ 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):
+
+ 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()))
+ elif opt_info['optData'].get('text'):
+ data_content = opt_info['optData']['text']
+ file_name = '/tmp/optim_engine_{}.dzn'.format(datetime.timestamp(datetime.now()))
+
+ with open(file_name, "wt") as data:
+ data.write(data_content)
+ return file_name
+
+
+def get_mzn_solver(solver):
+ return solver_dict.get(solver)