lcm/lcm/nf/biz/create_subscription.py

   1 # Copyright (C) 2018 Verizon. All Rights Reserved
   2 #
   3 # Licensed under the Apache License, Version 2.0 (the "License");
   4 # you may not use this file except in compliance with the License.
   5 # You may obtain a copy of the License at
   6 #
   7 #         http://www.apache.org/licenses/LICENSE-2.0
   8 #
   9 # Unless required by applicable law or agreed to in writing, software
  10 # distributed under the License is distributed on an "AS IS" BASIS,
  11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 import ast
  16 import json
  17 import logging
  18 import requests
  19 import uuid
  20
  21 from collections import Counter
  22
  23 from rest_framework import status
  24
  25 from lcm.nf import const
  26 from lcm.pub.database.models import SubscriptionModel
  27 from lcm.pub.exceptions import NFLCMException
  28 from lcm.pub.utils.values import ignore_case_get
  29
  30 logger = logging.getLogger(__name__)
  31
  32
  33 def is_filter_type_equal(new_filter, existing_filter):
  34     return Counter(new_filter) == Counter(existing_filter)
  35
  36
  37 class CreateSubscription:
  38     def __init__(self, data):
  39         self.data = data
  40         self.filter = ignore_case_get(self.data, "filter", {})
  41         self.callback_uri = ignore_case_get(self.data, "callbackUri")
  42         self.authentication = ignore_case_get(self.data, "authentication", {})
  43         self.notification_types = ignore_case_get(self.filter, "notificationTypes", [])
  44         self.operation_types = ignore_case_get(self.filter, "operationTypes", [])
  45         self.operation_states = ignore_case_get(self.filter, "operationStates", [])
  46         self.vnf_filter = \
  47             ignore_case_get(self.filter, "vnfInstanceSubscriptionFilter", {})
  48
  49     def check_callbackuri_connection(self):
  50         logger.debug("SubscribeNotification-post::> Sending GET request "
  51                      "to %s" % self.callback_uri)
  52         try:
  53             response = requests.get(self.callback_uri, timeout=2)
  54             if response.status_code != status.HTTP_204_NO_CONTENT:
  55                 raise NFLCMException("callbackUri %s returns %s status "
  56                                      "code." % (self.callback_uri, response.status_code))
  57         except Exception:
  58             raise NFLCMException("callbackUri %s didn't return 204 status"
  59                                  "code." % self.callback_uri)
  60
  61     def do_biz(self):
  62         self.subscription_id = str(uuid.uuid4())
  63         # self.check_callbackuri_connection()
  64         self.check_valid_auth_info()
  65         self.check_filter_types()
  66         self.check_valid()
  67         self.save_db()
  68         subscription = SubscriptionModel.objects.get(subscription_id=self.subscription_id)
  69         return subscription
  70
  71     def check_filter_types(self):
  72         logger.debug("SubscribeNotification--post::> Validating "
  73                      "operationTypes  and operationStates if exists")
  74         if self.operation_types and \
  75                 const.LCCNNOTIFICATION not in self.notification_types:
  76             raise NFLCMException("If you are setting operationTypes,"
  77                                  "then notificationTypes "
  78                                  "must be " + const.LCCNNOTIFICATION)
  79         if self.operation_states and \
  80                 const.LCCNNOTIFICATION not in self.notification_types:
  81             raise NFLCMException("If you are setting operationStates,"
  82                                  "then notificationTypes "
  83                                  "must be " + const.LCCNNOTIFICATION)
  84
  85     def check_valid_auth_info(self):
  86         logger.debug("SubscribeNotification--post::> Validating Auth "
  87                      "details if provided")
  88         if self.authentication.get("paramsBasic", {}) and \
  89                 const.BASIC not in self.authentication.get("authType"):
  90             raise NFLCMException('Auth type should be ' + const.BASIC)
  91         if self.authentication.get("paramsOauth2ClientCredentials", {}) and \
  92                 const.OAUTH2_CLIENT_CREDENTIALS not in self.authentication.get("authType"):
  93             raise NFLCMException('Auth type should be ' + const.OAUTH2_CLIENT_CREDENTIALS)
  94
  95     def check_filter_exists(self, sub):
  96         # Check the notificationTypes, operationTypes, operationStates
  97         for filter_type in ["operation_types",
  98                             "notification_types", "operation_states"]:
  99             if not is_filter_type_equal(getattr(self, filter_type),
 100                                         ast.literal_eval(getattr(sub, filter_type))):
 101                 return False
 102         # If all the above types are same then check vnf instance filters
 103         nf_filter = json.loads(sub.vnf_instance_filter)
 104         for vnf_filter_type in ["vnfdIds", "vnfInstanceIds",
 105                                 "vnfInstanceNames"]:
 106             if not is_filter_type_equal(self.vnf_filter.get(vnf_filter_type, []),
 107                                         nf_filter.get(vnf_filter_type, [])):
 108                 return False
 109         return True
 110
 111     def check_valid(self):
 112         logger.debug("SubscribeNotification--post::> Checking DB if "
 113                      "callbackUri already exists")
 114         subscriptions = SubscriptionModel.objects.filter(callback_uri=self.callback_uri)
 115         if not subscriptions.exists():
 116             return True
 117         for subscription in subscriptions:
 118             if self.check_filter_exists(subscription):
 119                 raise NFLCMException("Already Subscription exists with the "
 120                                      "same callbackUri and filter")
 121         return False
 122
 123     def save_db(self):
 124         logger.debug("SubscribeNotification--post::> Saving the subscription "
 125                      "%s to the database" % self.subscription_id)
 126         links = {
 127             "self": {
 128                 "href": const.ROOT_URI + self.subscription_id
 129             }
 130         }
 131         SubscriptionModel.objects.create(subscription_id=self.subscription_id,
 132                                          callback_uri=self.callback_uri,
 133                                          auth_info=self.authentication,
 134                                          notification_types=json.dumps(self.notification_types),
 135                                          operation_types=json.dumps(self.operation_types),
 136                                          operation_states=json.dumps(self.operation_states),
 137                                          vnf_instance_filter=json.dumps(self.vnf_filter),
 138                                          links=json.dumps(links))
 139         logger.debug('Create Subscription[%s] success', self.subscription_id)