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"""Main module of kytos/maintenance Kytos Network Application. |
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This NApp creates maintenance windows, allowing the maintenance of network |
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devices (a switch, a board, a link) without receiving alerts. |
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""" |
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import datetime |
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import pytz |
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from flask import jsonify, request |
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from napps.kytos.maintenance.models import MaintenanceWindow as MW |
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from napps.kytos.maintenance.models import Scheduler, Status |
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from werkzeug.exceptions import BadRequest, NotFound, UnsupportedMediaType |
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from kytos.core import KytosNApp, rest |
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class Main(KytosNApp): |
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"""Main class of kytos/maintenance NApp. |
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This class is the entry point for this napp. |
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""" |
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def setup(self): |
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"""Replace the '__init__' method for the KytosNApp subclass. |
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The setup method is automatically called by the controller when your |
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application is loaded. |
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So, if you have any setup routine, insert it here. |
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""" |
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self.maintenances = {} |
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self.scheduler = Scheduler() |
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def execute(self): |
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"""Run after the setup method execution. |
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You can also use this method in loop mode if you add to the above setup |
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method a line like the following example: |
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self.execute_as_loop(30) # 30-second interval. |
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""" |
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def shutdown(self): |
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"""Run when your napp is unloaded. |
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If you have some cleanup procedure, insert it here. |
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""" |
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@rest('/', methods=['GET']) |
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@rest('/<mw_id>', methods=['GET']) |
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def get_mw(self, mw_id=None): |
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"""Return one or all maintenance windows.""" |
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if mw_id is None: |
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return jsonify( |
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[maintenance.as_dict() |
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for maintenance in self.maintenances.values()]), 200 |
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try: |
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return jsonify(self.maintenances[mw_id].as_dict()), 200 |
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except KeyError: |
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raise NotFound(f'Maintenance with id {mw_id} not found') |
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@rest('/', methods=['POST']) |
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def create_mw(self): |
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"""Create a new maintenance window.""" |
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now = datetime.datetime.now(pytz.utc) |
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data = request.get_json() |
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if not data: |
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raise UnsupportedMediaType('The request does not have a json.') |
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try: |
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maintenance = MW.from_dict(data, self.controller) |
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except ValueError as err: |
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raise BadRequest(f'{err}') |
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if maintenance is None: |
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raise BadRequest('One or more items are invalid') |
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if maintenance.start < now: |
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raise BadRequest('Start in the past not allowed') |
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if maintenance.end <= maintenance.start: |
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raise BadRequest('End before start not allowed') |
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self.scheduler.add(maintenance) |
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self.maintenances[maintenance.id] = maintenance |
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return jsonify({'mw_id': maintenance.id}), 201 |
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@rest('/<mw_id>', methods=['PATCH']) |
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def update_mw(self, mw_id): |
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"""Update a maintenance window.""" |
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data = request.get_json() |
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if not data: |
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raise UnsupportedMediaType('The request does not have a json.') |
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try: |
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maintenance = self.maintenances[mw_id] |
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except KeyError: |
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raise NotFound(f'Maintenance with id {mw_id} not found') |
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if maintenance.status == Status.RUNNING: |
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raise BadRequest('Updating a running maintenance is not allowed') |
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try: |
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maintenance.update(data) |
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except ValueError as error: |
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raise BadRequest(f'{error}') |
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self.scheduler.remove(maintenance) |
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self.scheduler.add(maintenance) |
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return jsonify({'response': f'Maintenance {mw_id} updated'}), 200 |
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@rest('/<mw_id>', methods=['DELETE']) |
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def remove_mw(self, mw_id): |
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"""Delete a maintenance window.""" |
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try: |
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maintenance = self.maintenances[mw_id] |
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except KeyError: |
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raise NotFound(f'Maintenance with id {mw_id} not found') |
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if maintenance.status == Status.RUNNING: |
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raise BadRequest('Deleting a running maintenance is not allowed') |
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self.scheduler.remove(maintenance) |
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del self.maintenances[mw_id] |
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return jsonify({'response': f'Maintenance with id {mw_id} ' |
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f'successfully removed'}), 200 |
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@rest('/<mw_id>/end', methods=['PATCH']) |
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def end_mw(self, mw_id): |
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"""Finish a maintenance window right now.""" |
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try: |
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maintenance = self.maintenances[mw_id] |
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except KeyError: |
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raise NotFound(f'Maintenance with id {mw_id} not found') |
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now = datetime.datetime.now(pytz.utc) |
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if now < maintenance.start: |
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raise BadRequest(f'Maintenance window {mw_id} has not yet ' |
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'started.') |
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if now > maintenance.end: |
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raise BadRequest(f'Maintenance window {mw_id} has already ' |
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'finished.') |
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self.scheduler.remove(maintenance) |
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maintenance.end_mw() |
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return jsonify({'response': f'Maintenance window {mw_id} ' |
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f'finished.'}), 200 |
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@rest('/<mw_id>/extend', methods=['PATCH']) |
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def extend_mw(self, mw_id): |
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"""Extend a running maintenance window.""" |
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data = request.get_json() |
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if not data: |
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raise UnsupportedMediaType('The request does not have a json') |
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try: |
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maintenance = self.maintenances[mw_id] |
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except KeyError: |
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raise NotFound(f'Maintenance with id {mw_id} not found') |
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if 'minutes' not in data: |
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raise BadRequest('Minutes of extension must be sent') |
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now = datetime.datetime.now(pytz.utc) |
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if now < maintenance.start: |
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raise BadRequest(f'Maintenance window {mw_id} has not yet ' |
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'started') |
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if now > maintenance.end: |
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raise BadRequest(f'Maintenance window {mw_id} has already ' |
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'finished') |
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try: |
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maintenance.end = maintenance.end + \ |
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datetime.timedelta(minutes=data['minutes']) |
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except TypeError: |
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raise BadRequest('Minutes of extension must be integer') |
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self.scheduler.remove(maintenance) |
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self.scheduler.add(maintenance) |
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return jsonify({'response': f'Maintenance {mw_id} extended'}), 200 |
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kytos-ng /
maintenance
