+# ==================================================================================
+# Copyright (c) 2019 Nokia
+# Copyright (c) 2018-2019 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.
+# ==================================================================================
+
+"""
+Represents A1s database and database access functions.
+In the future, this may change to use a different backend, possibly dramatically.
+Hopefully, the access functions are a good api so nothing else has to change when this happens
+
+For now, the database is in memory.
+We use dict data structures (KV) with the expectation of having to move this into Redis
+"""
+from a1.exceptions import PolicyTypeNotFound, PolicyInstanceNotFound
+from a1 import get_module_logger
+
+logger = get_module_logger(__name__)
+
+# This is essentially mockouts for future KV
+# Note that the D subkey won't be needed when in redis, since you can store data at x anx x_y
+POLICY_DATA = {}
+I = "instances"
+H = "handlers"
+D = "data"
+
+
+# TODO: REMOVE THIS!! (should be done via PUT)
+POLICY_DATA[20000] = {}
+POLICY_DATA[20000][D] = {"foo": "bar"}
+POLICY_DATA[20000][I] = {}
+POLICY_DATA[20001] = {}
+POLICY_DATA[20001][D] = {"foo": "bar"}
+POLICY_DATA[20001][I] = {}
+
+
+def type_is_valid(policy_type_id):
+ """
+ check that a type is valid
+ """
+ if policy_type_id not in POLICY_DATA:
+ logger.error("%s not found", policy_type_id)
+ raise PolicyTypeNotFound()
+
+
+def instance_is_valid(policy_type_id, policy_instance_id):
+ """
+ check that an instance is valid
+ """
+ type_is_valid(policy_type_id)
+ if policy_instance_id not in POLICY_DATA[policy_type_id][I]:
+ raise PolicyInstanceNotFound
+
+
+def store_policy_instance(policy_type_id, policy_instance_id, instance):
+ """
+ Store a policy instance
+ """
+ type_is_valid(policy_type_id)
+
+ # store the instance
+ # Reset the statuses because this is a new policy instance, even if it was overwritten
+ POLICY_DATA[policy_type_id][I][policy_instance_id] = {}
+ POLICY_DATA[policy_type_id][I][policy_instance_id][D] = instance
+ POLICY_DATA[policy_type_id][I][policy_instance_id][H] = {}
+
+
+def get_policy_instance(policy_type_id, policy_instance_id):
+ """
+ Retrieve a policy instance
+ """
+ type_is_valid(policy_type_id)
+ instance_is_valid(policy_type_id, policy_instance_id)
+ return POLICY_DATA[policy_type_id][I][policy_instance_id][D]
+
+
+def get_policy_instance_statuses(policy_type_id, policy_instance_id):
+ """
+ Retrieve the status vector for a policy instance
+ """
+ type_is_valid(policy_type_id)
+ instance_is_valid(policy_type_id, policy_instance_id)
+
+ return [{"handler_id": k, "status": v} for k, v in POLICY_DATA[policy_type_id][I][policy_instance_id][H].items()]
+
+
+def set_policy_instance_status(policy_type_id, policy_instance_id, handler_id, status):
+ """
+ Update the status of a handler id of a policy instance
+ """
+ type_is_valid(policy_type_id)
+ instance_is_valid(policy_type_id, policy_instance_id)
+
+ POLICY_DATA[policy_type_id][I][policy_instance_id][H][handler_id] = status