4 # ==================================================================================
5 # Copyright (c) 2019 Nokia
6 # Copyright (c) 2018-2019 AT&T Intellectual Property.
8 # Licensed under the Apache License, Version 2.0 (the "License");
9 # you may not use this file except in compliance with the License.
10 # You may obtain a copy of the License at
12 # http://www.apache.org/licenses/LICENSE-2.0
14 # Unless required by applicable law or agreed to in writing, software
15 # distributed under the License is distributed on an "AS IS" BASIS,
16 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 # See the License for the specific language governing permissions and
18 # limitations under the License.
19 # ==================================================================================
21 from flask import Response
22 from jsonschema import validate
23 from jsonschema.exceptions import ValidationError
25 from a1 import get_module_logger
26 from a1 import a1rmr, exceptions, data
29 logger = get_module_logger(__name__)
32 def _try_func_return(func):
34 generic caller that returns the apporp http response if exceptions are raised
38 except (ValidationError, exceptions.PolicyTypeAlreadyExists) as exc:
41 except (exceptions.PolicyTypeNotFound, exceptions.PolicyInstanceNotFound) as exc:
44 except BaseException as exc:
45 # catch all, should never happen...
47 return Response(status=500)
50 def _gen_body_to_handler(operation, policy_type_id, policy_instance_id, payload=None):
52 used to create the payloads that get sent to downstream policy handlers
55 "operation": operation,
56 "policy_type_id": policy_type_id,
57 "policy_instance_id": policy_instance_id,
65 def get_healthcheck():
67 Handles healthcheck GET
68 Currently, this basically checks the server is alive.a1rmr
76 def get_all_policy_types():
78 Handles GET /a1-p/policytypes
80 return _try_func_return(data.get_type_list)
83 def create_policy_type(policy_type_id):
85 Handles PUT /a1-p/policytypes/policy_type_id
88 def put_type_handler():
89 data.store_policy_type(policy_type_id, body)
92 body = connexion.request.json
93 return _try_func_return(put_type_handler)
96 def get_policy_type(policy_type_id):
98 Handles GET /a1-p/policytypes/policy_type_id
100 return _try_func_return(lambda: data.get_policy_type(policy_type_id))
103 def delete_policy_type(policy_type_id):
105 Handles DELETE /a1-p/policytypes/policy_type_id
107 logger.error(policy_type_id)
114 def get_all_instances_for_type(policy_type_id):
116 Handles GET /a1-p/policytypes/policy_type_id/policies
119 def get_all_instance_handler():
120 # try to clean up instances for this type
121 for policy_instance_id in data.get_instance_list(policy_type_id):
122 data.delete_policy_instance_if_applicable(policy_type_id, policy_instance_id)
124 # re-fetch this list as it may have changed
125 return data.get_instance_list(policy_type_id), 200
127 return _try_func_return(get_all_instance_handler)
130 def get_policy_instance(policy_type_id, policy_instance_id):
132 Handles GET /a1-p/policytypes/polidyid/policies/policy_instance_id
135 def get_instance_handler():
136 # delete if applicable (will raise if not applicable to begin with)
137 data.delete_policy_instance_if_applicable(policy_type_id, policy_instance_id)
139 # raise 404 now that we may have deleted, or get the instance otherwise
140 return data.get_policy_instance(policy_type_id, policy_instance_id), 200
142 return _try_func_return(get_instance_handler)
145 def get_policy_instance_status(policy_type_id, policy_instance_id):
147 Handles GET /a1-p/policytypes/polidyid/policies/policy_instance_id/status
149 Return the aggregated status. The order of rules is as follows:
150 1. If a1 has received at least one status, and *all* received statuses are "DELETED", we blow away the instance and return a 404
151 2. if a1 has received at least one status and at least one is OK, we return "IN EFFECT"
152 3. "NOT IN EFFECT" otherwise (no statuses, or none are OK but not all are deleted)
155 def get_status_handler():
156 # delete if applicable (will raise if not applicable to begin with)
157 data.delete_policy_instance_if_applicable(policy_type_id, policy_instance_id)
159 vector = data.get_policy_instance_statuses(policy_type_id, policy_instance_id)
162 return "IN EFFECT", 200
163 return "NOT IN EFFECT", 200
165 return _try_func_return(get_status_handler)
168 def create_or_replace_policy_instance(policy_type_id, policy_instance_id):
170 Handles PUT /a1-p/policytypes/polidyid/policies/policy_instance_id
172 instance = connexion.request.json
174 def put_instance_handler():
176 Handles policy instance put
178 For now, policy_type_id is used as the message type
180 # validate the PUT against the schema
181 schema = data.get_policy_type(policy_type_id)["create_schema"]
182 validate(instance=instance, schema=schema)
185 data.store_policy_instance(policy_type_id, policy_instance_id, instance)
187 # send rmr (best effort)
188 body = _gen_body_to_handler("CREATE", policy_type_id, policy_instance_id, payload=instance)
189 a1rmr.send(json.dumps(body), message_type=policy_type_id)
193 return _try_func_return(put_instance_handler)
196 def delete_policy_instance(policy_type_id, policy_instance_id):
198 Handles DELETE /a1-p/policytypes/polidyid/policies/policy_instance_id
201 def delete_instance_handler():
203 here we send out the DELETEs but we don't delete the instance until a GET is called where we check the statuses
205 # send rmr (best effort)
206 body = _gen_body_to_handler("DELETE", policy_type_id, policy_instance_id)
207 a1rmr.send(json.dumps(body), message_type=policy_type_id)
211 return _try_func_return(delete_instance_handler)