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"""Module responsible to handle schedulers.""" |
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from uuid import uuid4 |
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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.triggers.cron import CronTrigger |
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from pytz import utc |
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from kytos.core import log |
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class CircuitSchedule: |
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"""Schedule events.""" |
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def __init__(self, **kwargs): |
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"""Create a CircuitSchedule object.""" |
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self._id = kwargs.get('id', uuid4().hex) |
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self.date = kwargs.get('date', None) |
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# The minimum number of seconds to wait between retries |
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self.interval = kwargs.get('interval', None) |
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# Frequency uses Cron format. Ex: "* * * * * *" |
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self.frequency = kwargs.get('frequency', None) |
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self.action = kwargs.get('action', 'create') |
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@property |
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def id(self): # pylint: disable=invalid-name |
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"""Return this EVC's ID.""" |
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return self._id |
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@id.setter |
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def id(self, value): # pylint: disable=invalid-name |
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"""Set this EVC's ID.""" |
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self._id = value |
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def as_dict(self): |
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"""Return a dictionary representing an circuit schedule object.""" |
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circuit_scheduler_dict = {'id': self.id, 'action': self.action} |
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if self.date: |
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circuit_scheduler_dict['date'] = self.date |
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if self.frequency: |
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circuit_scheduler_dict['frequency'] = self.frequency |
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if self.interval: |
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circuit_scheduler_dict['interval'] = self.interval |
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return circuit_scheduler_dict |
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@classmethod |
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def from_dict(cls, data): |
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"""Return a CircuitSchedule object from dict.""" |
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return cls(**data) |
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class Scheduler: |
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"""Class to schedule the circuits rules. |
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It is responsible to create/remove schedule jobs based on |
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Circuit Schedules. |
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""" |
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def __init__(self): |
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"""Create a new schedule structure.""" |
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self.scheduler = BackgroundScheduler(timezone=utc) |
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self.scheduler.start() |
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def shutdown(self): |
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"""Shutdown the scheduler.""" |
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self.scheduler.shutdown(wait=False) |
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def add(self, circuit): |
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""" |
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Add all circuit_scheduler from specific circuit. |
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Args: |
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circuit (napps.kytos.mef_eline.models.EVCBase): EVC circuit |
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""" |
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for circuit_scheduler in circuit.circuit_scheduler: |
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self.add_circuit_job(circuit, circuit_scheduler) |
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def remove(self, circuit): |
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"""Remove all scheduler from a circuit.""" |
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for job in circuit.circuit_scheduler: |
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self.cancel_job(job.id) |
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def add_circuit_job(self, circuit, circuit_scheduler): |
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""" |
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Prepare the Circuit data to be added to the Scheduler. |
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:param circuit(napps.kytos.mef_eline.models.EVCBase): EVC circuit |
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:param circuit_scheduler (CircuitSchedule): Circuit schedule data |
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:return: |
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""" |
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job_call = None |
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if circuit_scheduler.action == 'create': |
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job_call = circuit.deploy |
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elif circuit_scheduler.action == 'remove': |
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job_call = circuit.remove |
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data = {'id': circuit_scheduler.id} |
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if circuit_scheduler.date: |
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data.update({'run_date': circuit_scheduler.date}) |
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else: |
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data.update({'start_date': circuit.start_date, |
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'end_date': circuit.end_date}) |
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if circuit_scheduler.interval: |
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data.update(circuit_scheduler.interval) |
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self.add_job(circuit_scheduler, job_call, data) |
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def add_job(self, circuit_scheduler, job_call, data): |
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""" |
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Add a specific cron job to the scheduler. |
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Args: |
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circuit_scheduler: CircuitSchedule object |
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job_call: function to be called by the job |
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data: Dict to pass to the job_call as parameter |
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if job_call is a date, the template is like: |
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{'id': <ID>, 'run_date': date } or |
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{'id': <ID>, 'start_date': date, 'end_date': date } |
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if job_call is an interval, the template is like: |
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{ 'id': <ID>, |
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'hours': 2, |
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'minutes': 3 |
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} |
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if job_call is frequency, the template is the cron format. |
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""" |
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if circuit_scheduler.date: |
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self.scheduler.add_job(job_call, 'date', **data) |
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elif circuit_scheduler.interval: |
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self.scheduler.add_job(job_call, 'interval', **data) |
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elif circuit_scheduler.frequency: |
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cron = CronTrigger.from_crontab(circuit_scheduler.frequency, |
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timezone=utc) |
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self.scheduler.add_job(job_call, cron, **data) |
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def cancel_job(self, circuit_scheduler_id): |
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"""Cancel a specific job from scheduler.""" |
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try: |
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self.scheduler.remove_job(circuit_scheduler_id) |
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except JobLookupError as job_error: |
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# Job was not found... Maybe someone already remove it. |
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log.error("Scheduler error cancelling job. %s" % job_error) |
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kytos /
mef_eline
