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# Copyright (c) 2019, ZTE Corporation.
# 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 ast
import json
import logging
import requests
import uuid
from collections import Counter
from rest_framework import status
from lcm.ns.enum import NOTIFICATION_TYPE, AUTH_TYPE
from lcm.pub.database.models import SubscriptionModel
from lcm.pub.exceptions import NSLCMException, SeeOtherException
from lcm.pub.utils.values import ignore_case_get
from lcm.ns import const
logger = logging.getLogger(__name__)
def is_filter_type_equal(new_filter, existing_filter):
return Counter(new_filter) == Counter(existing_filter)
FILTER_TYPE = [
"operation_types",
"ns_component_types",
"lcm_opname_impacting_nscomponent",
"lcm_opoccstatus_impacting_nscomponent",
"notification_types",
"operation_states"
]
NS_FILTER_TYPE = [
"nsdIds",
"nsInstanceIds",
"vnfdIds",
"pnfdIds",
"nsInstanceNames"
]
class CreateSubscription:
"""
Subscription Create process
"""
def __init__(self, data):
self.data = data
self.filter = ignore_case_get(self.data, "filter", {})
self.callback_uri = ignore_case_get(self.data, "callbackUri")
self.authentication = ignore_case_get(self.data, "authentication", {})
self.notification_types = ignore_case_get(self.filter, "notificationTypes", [])
self.operation_types = ignore_case_get(self.filter, "operationTypes", [])
self.operation_states = ignore_case_get(self.filter, "notificationStates", [])
self.ns_component_types = ignore_case_get(self.filter, "nsComponentTypes", [])
self.lcm_opname_impacting_nscomponent = ignore_case_get(
self.filter,
"lcmOpNameImpactingNsComponent",
[]
)
self.lcm_opoccstatus_impacting_nscomponent = ignore_case_get(
self.filter,
"lcmOpOccStatusImpactingNsComponent",
[]
)
self.ns_filter = ignore_case_get(
self.filter,
"nsInstanceSubscriptionFilter",
{}
)
def check_callback_uri(self):
"""
Check if the callback Uri can access
:return:
"""
logger.debug("SubscribeNotification-post::> Sending GET request to %s" % self.callback_uri)
try:
response = requests.get(self.callback_uri, timeout=2)
if response.status_code != status.HTTP_204_NO_CONTENT:
raise NSLCMException("callbackUri %s returns %s status code." % (
self.callback_uri,
response.status_code
))
except Exception:
raise NSLCMException("callbackUri %s didn't return 204 status code." % self.callback_uri)
def do_biz(self):
self.subscription_id = str(uuid.uuid4())
# self.check_callback_uri()
self.check_valid_auth_info()
self.check_filter_types()
self.check_valid()
self.save_db()
subscription = SubscriptionModel.objects.get(subscription_id=self.subscription_id)
return subscription
def check_filter_types(self):
"""
Validate operationTypes and operationStates if exists
:return:
"""
logger.debug("SubscribeNotification--post::> Validating operationTypes and operationStates if exists")
occ_notification = NOTIFICATION_TYPE.NSLCM_OPERATION_OCCURRENCE_NOTIFICATION
if self.operation_types and occ_notification not in self.notification_types:
except_message = "If you are setting operationTypes, notificationTypes must be %s"
raise NSLCMException(except_message % occ_notification)
if self.operation_states and occ_notification not in self.notification_types:
except_message = "If you are setting operationStates, notificationTypes must be %s"
raise NSLCMException(except_message % occ_notification)
def check_valid_auth_info(self):
"""
Validate Auth details if provided
:return:
"""
logger.debug("SubscribeNotification--post::> Validating Auth details if provided")
auth_type = self.authentication.get("authType")
params_basic = self.authentication.get("paramsBasic")
params_oauth2 = self.authentication.get("paramsOauth2ClientCredentials")
if params_basic and AUTH_TYPE.BASIC not in auth_type:
raise NSLCMException('Auth type should be ' + AUTH_TYPE.BASIC)
if params_oauth2 and AUTH_TYPE.OAUTH2_CLIENT_CREDENTIALS not in auth_type:
raise NSLCMException('Auth type should be ' + AUTH_TYPE.OAUTH2_CLIENT_CREDENTIALS)
def check_filter_exists(self, sub):
# Check the notificationTypes, operationTypes, operationStates
for filter_type in FILTER_TYPE:
if not is_filter_type_equal(
getattr(self, filter_type),
ast.literal_eval(getattr(sub, filter_type))
):
return False
# If all the above types are same then check ns instance filters
ns_filter = json.loads(sub.ns_instance_filter)
for ns_filter_type in NS_FILTER_TYPE:
if not is_filter_type_equal(
self.ns_filter.get(ns_filter_type, []),
ns_filter.get(ns_filter_type, [])
):
return False
return True
def check_valid(self):
"""
Check DB if callbackUri already exists
:return:
"""
logger.debug("SubscribeNotification--post::> Checking DB if callbackUri already exists")
subscriptions = SubscriptionModel.objects.filter(callback_uri=self.callback_uri)
if not subscriptions.exists():
return True
for subscription in subscriptions:
if self.check_filter_exists(subscription):
raise SeeOtherException("Already Subscription exists with the same callbackUri and filter")
return False
def save_db(self):
"""
Save the subscription(%s) to the database
:return:
"""
logger.debug(
"SubscribeNotification--post::> Saving the subscription(%s) to the database" % self.subscription_id)
links = {
"self": {
"href": const.SUBSCRIPTION_ROOT_URI % self.subscription_id
}
}
SubscriptionModel.objects.create(
subscription_id=self.subscription_id,
callback_uri=self.callback_uri,
auth_info=self.authentication,
notification_types=json.dumps(self.notification_types),
operation_types=json.dumps(self.operation_types),
operation_states=json.dumps(self.operation_states),
ns_instance_filter=json.dumps(self.ns_filter),
ns_component_types=json.dumps(self.ns_component_types),
lcm_opname_impacting_nscomponent=json.dumps(self.lcm_opname_impacting_nscomponent),
lcm_opoccstatus_impacting_nscomponent=json.dumps(self.lcm_opoccstatus_impacting_nscomponent),
links=json.dumps(links))
logger.debug('Create Subscription[%s] success', self.subscription_id)
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