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"""Module for handling the scheduled execution of maintenance windows.""" |
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import pytz |
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from dataclasses import dataclass |
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from apscheduler.jobstores.base import JobLookupError |
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from apscheduler.schedulers.background import BackgroundScheduler |
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from apscheduler.schedulers.base import BaseScheduler |
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from .deployer import MaintenanceDeployer |
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from ..controllers import MaintenanceController |
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from ..models import ( |
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MaintenanceID, |
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MaintenanceWindow, |
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MaintenanceWindows, |
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OverlapError, |
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Status, |
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) |
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from kytos.core import log |
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@dataclass |
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class MaintenanceStart: |
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""" |
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Callable used for starting maintenance windows |
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""" |
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maintenance_scheduler: 'MaintenanceScheduler' |
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mw_id: MaintenanceID |
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def __call__(self): |
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self.maintenance_scheduler.start_maintenance(self.mw_id) |
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@dataclass |
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class MaintenanceEnd: |
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""" |
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Callable used for ending maintenance windows |
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""" |
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maintenance_scheduler: 'MaintenanceScheduler' |
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mw_id: MaintenanceID |
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def __call__(self): |
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self.maintenance_scheduler.end_maintenance(self.mw_id) |
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@dataclass |
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class MaintenanceScheduler: |
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"""Class for scheduling maintenance windows.""" |
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deployer: MaintenanceDeployer |
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db_controller: MaintenanceController |
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scheduler: BaseScheduler |
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@classmethod |
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def new_scheduler(cls, deployer: MaintenanceDeployer): |
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""" |
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Creates a new scheduler from the given MaintenanceDeployer |
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""" |
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scheduler = BackgroundScheduler(timezone=pytz.utc) |
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db_controller = MaintenanceController() |
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db_controller.bootstrap_indexes() |
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instance = cls(deployer, db_controller, scheduler) |
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return instance |
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def start(self): |
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""" |
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Begin running the scheduler. |
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""" |
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self.db_controller.prepare_start() |
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# Populate the scheduler with all pending tasks |
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windows = self.db_controller.get_unfinished_windows() |
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for window in windows: |
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if window.status == Status.RUNNING: |
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self.deployer.start_mw(window) |
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self._schedule(window) |
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# Start the scheduler |
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self.scheduler.start() |
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def shutdown(self): |
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""" |
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Stop running the scheduler. |
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""" |
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windows = self.db_controller.get_windows() |
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# Depopulate the scheduler |
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for window in windows: |
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self._unschedule(window) |
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self.scheduler.remove_all_jobs() |
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self.scheduler.shutdown() |
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def start_maintenance(self, mw_id: MaintenanceID): |
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"""Begins executing the maintenance window |
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""" |
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# Get Maintenance from DB and Update |
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window = self.db_controller.start_window(mw_id) |
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# Activate Running |
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self.deployer.start_mw(window) |
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# Schedule next task |
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self._schedule(window) |
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def end_maintenance(self, mw_id: MaintenanceID): |
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"""Ends execution of the maintenance window |
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""" |
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# Get Maintenance from DB |
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window = self.db_controller.end_window(mw_id) |
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# Set to Ending |
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self.deployer.end_mw(window) |
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def end_maintenance_early(self, mw_id: MaintenanceID): |
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"""Ends execution of the maintenance window early |
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""" |
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# Get Maintenance from DB |
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window = self.db_controller.end_window(mw_id) |
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# Unschedule tasks |
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self._unschedule(window) |
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def add(self, window: MaintenanceWindow, force=False): |
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"""Add jobs to start and end a maintenance window.""" |
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overlapping_windows = self.db_controller.check_overlap(window, force) |
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if overlapping_windows: |
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raise OverlapError(window, overlapping_windows) |
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# Add window to DB |
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self.db_controller.insert_window(window) |
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# Schedule next task |
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self._schedule(window) |
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def update(self, window: MaintenanceWindow): |
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"""Update an existing Maintenance Window.""" |
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# Update window |
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self.db_controller.update_window(window) |
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# Reschedule any pending tasks |
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self._reschedule(window) |
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def remove(self, mw_id: MaintenanceID): |
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"""Remove jobs that start and end a maintenance window.""" |
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# Get Maintenance from DB |
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window = self.db_controller.get_window(mw_id) |
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# Remove from schedule |
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self._unschedule(window) |
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# Remove from DB |
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self.db_controller.remove_window(mw_id) |
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def _schedule(self, window: MaintenanceWindow): |
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log.info(f'Scheduling "{window.id}"') |
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if window.status == Status.PENDING: |
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self.scheduler.add_job( |
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MaintenanceStart(self, window.id), |
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'date', |
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id=f'{window.id}-start', |
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run_date=window.start |
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) |
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log.info(f'Scheduled "{window.id}" start at {window.start}') |
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if window.status == Status.RUNNING: |
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self.scheduler.add_job( |
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MaintenanceEnd(self, window.id), |
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'date', |
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id=f'{window.id}-end', |
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run_date=window.end |
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) |
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log.info(f'Scheduled "{window.id}" end at {window.end}') |
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def _reschedule(self, window: MaintenanceWindow): |
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log.info(f'Rescheduling "{window.id}"') |
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try: |
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self.scheduler.remove_job( |
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f'{window.id}-start', |
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) |
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self.scheduler.add_job( |
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MaintenanceStart(self, window.id), |
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'date', |
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id=f'{window.id}-start', |
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run_date=window.start |
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) |
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log.info(f'Rescheduled "{window.id}" start to {window.start}') |
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except JobLookupError: |
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log.info(f'Could not reschedule "{window.id}" start, no start job') |
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try: |
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self.scheduler.remove_job( |
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f'{window.id}-end', |
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) |
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self.scheduler.add_job( |
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MaintenanceEnd(self, window.id), |
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'date', |
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id=f'{window.id}-end', |
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run_date=window.end |
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) |
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log.info(f'Rescheduled "{window.id}" end to {window.end}') |
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except JobLookupError: |
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log.info(f'Could not reschedule "{window.id}" end, no end job') |
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def _unschedule(self, window: MaintenanceWindow): |
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"""Remove maintenance events from scheduler. |
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Does not update DB, due to being |
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primarily for shutdown startup cases. |
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""" |
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started = False |
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ended = False |
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try: |
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self.scheduler.remove_job(f'{window.id}-start') |
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except JobLookupError: |
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started = True |
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log.info(f'Job to start "{window.id}" already removed.') |
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try: |
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self.scheduler.remove_job(f'{window.id}-end') |
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except JobLookupError: |
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ended = True |
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log.info(f'Job to end "{window.id}" already removed.') |
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if started and not ended: |
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self.deployer.end_mw(window) |
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def get_maintenance(self, mw_id: MaintenanceID) -> MaintenanceWindow: |
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"""Get a single maintenance by id""" |
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return self.db_controller.get_window(mw_id) |
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def list_maintenances(self) -> MaintenanceWindows: |
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"""Returns a list of all maintenances""" |
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return self.db_controller.get_windows() |
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kytos-ng /
maintenance
