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# Copyright 2020 K Sai Kiran (Tata Elxsi) |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
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# implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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__author__ = "K Sai Kiran <saikiran.k@tataelxsi.co.in>" |
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__date__ = "$28-Apr-2020 23:59:59$" |
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|
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import asyncio |
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import aiohttp |
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from http import HTTPStatus |
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import json |
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import logging |
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import time |
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from uuid import uuid4 |
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class NotificationException(Exception): |
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""" |
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Notification Exception |
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""" |
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def __init__(self, message: str, http_code: int = HTTPStatus.BAD_REQUEST) -> None: |
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""" |
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Constructor of notification exception |
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:param message: String text containing exception details. |
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:param http_code: HTTP status code of exception. |
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""" |
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self.http_code = http_code |
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Exception.__init__(self, message) |
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|
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|
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class NotificationBase: |
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response_models = None |
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# Common HTTP payload header for all notifications. |
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payload_header = {"Content-Type": "application/json", "Accept": "application/json"} |
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|
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def __init__(self, db) -> None: |
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""" |
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Constructor of NotificationBase class. |
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:param db: Database handler. |
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""" |
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self.db = db |
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self.logger = logging.getLogger("nbi.notifications") |
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self.subscriber_collection = None |
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|
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def get_models(self) -> dict: |
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""" |
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Returns the SOL005 model of notification class |
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:param None |
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:return: dict of SOL005 data model |
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""" |
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return NotificationBase.response_models |
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def get_subscribers(self, **kwargs) -> NotificationException: |
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""" |
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Method should be implemented by all notification subclasses |
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:param kwargs: any keyword arguments needed for db query. |
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:return: List of subscribers |
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""" |
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raise NotificationException( |
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"Method get_subscribers() is not implemented", |
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http_code=HTTPStatus.NOT_IMPLEMENTED, |
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) |
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|
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@staticmethod |
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def _get_basic_auth(username: str, password: str) -> tuple: |
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return aiohttp.BasicAuth(username, password) |
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|
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def _decrypt_password( |
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self, hashed: str, salt: str, schema_version: str = "1.1" |
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) -> str: |
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return self.db.decrypt(hashed, schema_version, salt=salt) |
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|
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def get_payload(self, meta_notification: dict) -> dict: |
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""" |
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Generates SOL005 compliant payload structure and returns them in dictionary. |
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:param meta_notification: notification meta data which needs to be formatted as SOL005 compliant |
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:return: A dictionary which is SOL005 compliant. |
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""" |
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model_name = meta_notification["notificationType"] |
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response_models = self.get_models() |
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if not response_models or not response_models.get(model_name): |
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raise NotificationException( |
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"Response model {} is not defined.".format(model_name), |
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HTTPStatus.NOT_IMPLEMENTED, |
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) |
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model_keys = response_models[model_name] |
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payload = dict.fromkeys(model_keys, "N/A") |
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notification_keys = set(meta_notification.keys()) |
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for model_key in model_keys.intersection(notification_keys): |
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payload[model_key] = meta_notification[model_key] |
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self.logger.debug( |
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"Payload generated for subscriber: {} for {}".format( |
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payload["subscriptionId"], payload["notificationType"] |
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) |
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) |
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return payload |
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async def send_notifications( |
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self, |
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subscribers: list, |
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): |
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""" |
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Generate tasks for all notification for an event. |
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:param subscribers: A list of subscribers who want to be notified for event. |
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""" |
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notifications = [] |
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for subscriber in subscribers: |
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# Notify without auth |
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if not subscriber.get("authentication"): |
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notifications.append( |
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{ |
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"headers": self.payload_header, |
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"payload": self.get_payload(subscriber), |
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"CallbackUri": subscriber["CallbackUri"], |
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} |
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) |
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elif subscriber["authentication"]["authType"] == "basic": |
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salt = subscriber["subscriptionId"] |
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hashed_password = subscriber["authentication"]["paramsBasic"][ |
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"password" |
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] |
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password = self._decrypt_password(hashed_password, salt) |
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auth_basic = self._get_basic_auth( |
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subscriber["authentication"]["paramsBasic"]["userName"], password |
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) |
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notifications.append( |
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{ |
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"headers": self.payload_header, |
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"payload": self.get_payload(subscriber), |
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"auth_basic": auth_basic, |
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"CallbackUri": subscriber["CallbackUri"], |
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} |
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) |
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# TODO add support for AuthType OAuth and TLS after support is added in subscription. |
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else: |
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self.logger.debug( |
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"Subscriber {} can not be notified. {} notification auth type is not implemented".format( |
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subscriber["subscriptionId"], |
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subscriber["authentication"]["authType"], |
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) |
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) |
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if notifications: |
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tasks = [] |
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async with aiohttp.ClientSession() as session: |
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for notification in notifications: |
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tasks.append( |
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asyncio.ensure_future( |
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self.send_notification(session, notification), |
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) |
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) |
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await asyncio.gather(*tasks) |
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async def send_notification( |
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self, |
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session: aiohttp.ClientSession, |
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notification: dict, |
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retry_count: int = 5, |
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timeout: float = 5.0, |
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): |
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""" |
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Performs HTTP Post request to notify subscriber. In case if for any reason notification is not sent successfully |
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after maximum number of reties, then notification is dropped. |
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:param session: An aiohttp client session object to maintain http session. |
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:param notification: A dictionary containing all necessary data to make POST request. |
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:param retry_count: An integer specifying the maximum number of reties for a notification. |
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:param timeout: A float representing client timeout of each HTTP request. |
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""" |
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backoff_delay = 1 |
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while retry_count > 0: |
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try: |
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async with session.post( |
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url=notification["CallbackUri"], |
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headers=notification["headers"], |
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auth=notification.get("auth_basic", None), |
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data=json.dumps(notification["payload"]), |
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timeout=timeout, |
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) as resp: |
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# self.logger.debug("Notification response: {}".format(resp.status)) |
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if resp.status == HTTPStatus.NO_CONTENT: |
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self.logger.debug( |
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"Notification sent successfully to subscriber {}".format( |
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notification["payload"]["subscriptionId"] |
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) |
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) |
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else: |
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error_text = "Erroneous response code: {}, ".format(resp.status) |
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error_text += await resp.text() |
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raise NotificationException(error_text) |
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return True |
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except Exception as e: |
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error_text = type(e).__name__ + ": " + str(e) |
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self.logger.debug( |
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"Unable to send notification to subscriber {}. Details: {}".format( |
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notification["payload"]["subscriptionId"], error_text |
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) |
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) |
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error_detail = { |
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"error": type(e).__name__, |
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"error_text": str(e), |
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"timestamp": time.time(), |
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} |
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if "error_details" in notification["payload"].keys(): |
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notification["payload"]["error_details"].append(error_detail) |
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else: |
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notification["payload"]["error_details"] = [error_detail] |
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retry_count -= 1 |
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backoff_delay *= 2 |
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self.logger.debug( |
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"Retry Notification for subscriber: {} after backoff delay: {} seconds.".format( |
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notification["payload"]["subscriptionId"], backoff_delay |
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) |
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) |
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await asyncio.sleep(backoff_delay) |
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# Dropping notification |
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self.logger.debug( |
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"Notification {} sent failed to subscriber:{}.".format( |
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notification["payload"]["notificationType"], |
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notification["payload"]["subscriptionId"], |
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) |
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) |
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return False |
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class NsLcmNotification(NotificationBase): |
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# SOL005 response model for nslcm notifications |
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response_models = { |
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"NsLcmOperationOccurrenceNotification": { |
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"id", |
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"nsInstanceId", |
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"nsLcmOpOccId", |
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"operation", |
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"notificationType", |
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"subscriptionId", |
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"timestamp", |
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"notificationStatus", |
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"operationState", |
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"isAutomaticInvocation", |
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"affectedVnf", |
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"affectedVl", |
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"affectedVnffg", |
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"affectedNs", |
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"affectedSap", |
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"error", |
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"_links", |
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}, |
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"NsIdentifierCreationNotification": { |
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"notificationType", |
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"subscriptionId", |
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"timestamp", |
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"nsInstanceId", |
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"_links", |
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}, |
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"NsIdentifierDeletionNotification": { |
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"notificationType", |
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"subscriptionId", |
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"timestamp", |
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"nsInstanceId", |
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"_links", |
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}, |
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"NsChangeNotification": { |
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"nsInstanceId", |
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"nsComponentType", |
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"nsComponentId", |
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"lcmOpOccIdImpactngNsComponent", |
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"lcmOpNameImpactingNsComponent", |
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"lcmOpOccStatusImpactingNsComponent", |
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"notificationType", |
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"subscriptionId", |
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"timeStamp", |
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"error", |
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"_links", |
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}, |
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} |
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def __init__(self, db) -> None: |
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""" |
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Constructor of NsLcmNotification class. |
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:param db: Database handler. |
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""" |
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super().__init__(db) |
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self.subscriber_collection = "mapped_subscriptions" |
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|
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def get_models(self) -> dict: |
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""" |
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Returns the SOL005 model of notification class |
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:param None |
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:return: dict of SOL005 data model |
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""" |
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return NsLcmNotification.response_models |
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|
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@staticmethod |
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def _format_nslcm_subscribers(subscribers: list, event_details: dict) -> list: |
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""" |
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Formats the raw event details from kakfa message and subscriber details. |
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:param subscribers: A list of subscribers whom the event needs to be notified. |
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:param event_details: A dict containing all meta data of event. |
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:return: |
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""" |
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notification_id = str(uuid4()) |
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event_timestamp = event_details["params"]["startTime"] |
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resource_links = event_details["params"]["links"] |
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event_operation = event_details["command"] |
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for key in ["_admin", "_id", "id", "links"]: |
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event_details["params"].pop(key, None) |
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for subscriber in subscribers: |
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subscriber["id"] = notification_id |
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subscriber["timestamp"] = event_timestamp |
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subscriber["_links"] = resource_links |
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subscriber["subscriptionId"] = subscriber["reference"] |
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subscriber["operation"] = event_operation |
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del subscriber["reference"] |
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del subscriber["_id"] |
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subscriber.update(event_details["params"]) |
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return subscribers |
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|
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def get_subscribers( |
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self, |
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nsd_id: str, |
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ns_instance_id: str, |
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command: str, |
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op_state: str, |
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event_details: dict, |
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) -> list: |
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""" |
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Queries database and returns list of subscribers. |
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:param nsd_id: NSD id of an NS whose lifecycle has changed. (scaled, terminated. etc) |
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:param ns_instance_id: NS instance id an NS whose lifecycle has changed. |
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:param command: the command for event. |
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:param op_state: the operation state of NS. |
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:param event_details: dict containing raw data of event occured. |
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:return: List of interested subscribers for occurred event. |
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""" |
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notification_type = [ |
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"NsLcmOperationOccurrenceNotification", |
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"NsChangeNotification", |
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"NsIdentifierCreationNotification", |
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"NsIdentifierDeletionNotification", |
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] |
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filter_q = { |
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"identifier": [nsd_id, ns_instance_id], |
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"operationStates": ["ANY"], |
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"operationTypes": ["ANY"], |
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"notificationType": notification_type, |
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} |
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if op_state: |
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filter_q["operationStates"].append(op_state) |
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if command: |
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filter_q["operationTypes"].append(command) |
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# self.logger.debug("Db query is: {}".format(filter_q)) |
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subscribers = [] |
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try: |
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subscribers = self.db.get_list(self.subscriber_collection, filter_q) |
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subscribers = self._format_nslcm_subscribers(subscribers, event_details) |
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except Exception as e: |
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error_text = type(e).__name__ + ": " + str(e) |
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self.logger.debug("Error getting nslcm subscribers: {}".format(error_text)) |
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finally: |
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return subscribers |
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|
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|
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class VnfLcmNotification(NotificationBase): |
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# SOL003 response model for vnflcm notifications |
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response_models = { |
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"VnfLcmOperationOccurrenceNotification": { |
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"id", |
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"notificationType", |
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"subscriptionId", |
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"timeStamp", |
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"notificationStatus", |
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"operationState", |
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"vnfInstanceId", |
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"operation", |
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"isAutomaticInvocation", |
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"vnfLcmOpOccId", |
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"affectedVnfcs", |
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"affectedVirtualLinks", |
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"affectedExtLinkPorts", |
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"affectedVirtualStorages", |
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"changedInfo", |
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"changedExtConnectivity", |
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"modificationsTriggeredByVnfPkgChange", |
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"error", |
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"_links", |
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}, |
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"VnfIdentifierCreationNotification": { |
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"id", |
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"notificationType", |
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"subscriptionId", |
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"timeStamp", |
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"vnfInstanceId", |
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"_links", |
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}, |
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"VnfIdentifierDeletionNotification": { |
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"id", |
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"notificationType", |
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"subscriptionId", |
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"timeStamp", |
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"vnfInstanceId", |
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"_links", |
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}, |
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} |
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|
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def __init__(self, db) -> None: |
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""" |
| 418 |
|
Constructor of VnfLcmNotification class. |
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|
:param db: Database handler. |
| 420 |
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""" |
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super().__init__(db) |
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self.subscriber_collection = "mapped_subscriptions" |
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|
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def get_models(self) -> dict: |
| 425 |
|
""" |
| 426 |
|
Returns the SOL003 model of notification class |
| 427 |
|
:param None |
| 428 |
|
:return: dict of SOL003 data model |
| 429 |
|
""" |
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return self.response_models |
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|
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def _format_vnflcm_subscribers( |
| 433 |
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self, subscribers: list, event_details: dict |
| 434 |
|
) -> list: |
| 435 |
|
""" |
| 436 |
|
Formats the raw event details from kafka message and subscriber details. |
| 437 |
|
:param subscribers: A list of subscribers whom the event needs to be notified. |
| 438 |
|
:param event_details: A dict containing all meta data of event. |
| 439 |
|
:return: |
| 440 |
|
""" |
| 441 |
0 |
notification_id = str(uuid4()) |
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0 |
event_timestamp = time.time() |
| 443 |
0 |
event_operation = event_details["command"] |
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0 |
for subscriber in subscribers: |
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0 |
subscriber["id"] = notification_id |
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0 |
subscriber["timeStamp"] = event_timestamp |
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subscriber["subscriptionId"] = subscriber["reference"] |
| 448 |
0 |
subscriber["operation"] = event_operation |
| 449 |
0 |
del subscriber["reference"] |
| 450 |
0 |
del subscriber["_id"] |
| 451 |
0 |
subscriber.update(event_details["params"]) |
| 452 |
0 |
return subscribers |
| 453 |
|
|
| 454 |
0 |
def get_subscribers( |
| 455 |
|
self, |
| 456 |
|
vnfd_id: str, |
| 457 |
|
vnf_instance_id: str, |
| 458 |
|
command: str, |
| 459 |
|
op_state: str, |
| 460 |
|
event_details: dict, |
| 461 |
|
) -> list: |
| 462 |
|
""" |
| 463 |
|
Queries database and returns list of subscribers. |
| 464 |
|
:param vnfd_id: Vnfd id of a VNF whose lifecycle has changed. (instantiated, scaled, terminated. etc) |
| 465 |
|
:param vnf_instance_id: Vnf instance id of a VNF whose lifecycle has changed. |
| 466 |
|
:param command: the command for event. |
| 467 |
|
:param op_state: the operation state of VNF. |
| 468 |
|
:param event_details: dict containing raw data of event occurred. |
| 469 |
|
:return: List of interested subscribers for occurred event. |
| 470 |
|
""" |
| 471 |
0 |
notification_type = [ |
| 472 |
|
"VnfIdentifierCreationNotification", |
| 473 |
|
"VnfLcmOperationOccurrenceNotification", |
| 474 |
|
"VnfIdentifierDeletionNotification", |
| 475 |
|
] |
| 476 |
0 |
filter_q = { |
| 477 |
|
"identifier": [vnfd_id, vnf_instance_id], |
| 478 |
|
"operationStates": ["ANY"], |
| 479 |
|
"operationTypes": ["ANY"], |
| 480 |
|
"notificationType": notification_type, |
| 481 |
|
} |
| 482 |
0 |
if op_state: |
| 483 |
0 |
filter_q["operationStates"].append(op_state) |
| 484 |
0 |
if command: |
| 485 |
0 |
filter_q["operationTypes"].append(command) |
| 486 |
0 |
subscribers = [] |
| 487 |
0 |
try: |
| 488 |
0 |
subscribers = self.db.get_list(self.subscriber_collection, filter_q) |
| 489 |
0 |
subscribers = self._format_vnflcm_subscribers(subscribers, event_details) |
| 490 |
0 |
except Exception as e: |
| 491 |
0 |
error_text = type(e).__name__ + ": " + str(e) |
| 492 |
0 |
self.logger.debug("Error getting vnflcm subscribers: {}".format(error_text)) |
| 493 |
|
finally: |
| 494 |
0 |
return subscribers |
| 495 |
|
|
| 496 |
|
|
| 497 |
0 |
class NsdNotification(NotificationBase): |
| 498 |
0 |
def __init__(self, db): |
| 499 |
|
""" |
| 500 |
|
Constructor of the class |
| 501 |
|
""" |
| 502 |
0 |
super().__init__(db) |
| 503 |
|
# TODO will update this once support is there from subscription |
| 504 |
0 |
self.response_models = {} |
| 505 |
0 |
self.subscriber_collection = None |
| 506 |
|
|
| 507 |
|
|
| 508 |
0 |
class VnfdNotification(NotificationBase): |
| 509 |
0 |
def __init__(self, db): |
| 510 |
|
""" |
| 511 |
|
Constructor of the class |
| 512 |
|
""" |
| 513 |
0 |
super().__init__(db) |
| 514 |
|
# TODO will update this once support is there from subscription |
| 515 |
0 |
self.response_models = {} |
| 516 |
0 |
self.subscriber_collection = None |
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