Merge "Adding the generic solver code"

1 files changed, 79 insertions, 0 deletions

diff --git a/runtime/optim_engine.py b/runtime/optim_engine.py
new file mode 100644
index 0000000..4a8788e
--- /dev/null
+++ b/runtime/optim_engine.py
@@ -0,0 +1,79 @@
+# -------------------------------------------------------------------------
+#   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