/
views.py
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/
views.py
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# Copyright 2018 Google Inc
#
# 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.
"""Cron handler."""
import logging
import time
from google.appengine.api import urlfetch
from croniter import croniter
from flask import Blueprint
from flask_restful import Resource
from core import insight
from core.models import Pipeline
from jbackend.extensions import api
blueprint = Blueprint('cron', __name__)
class Cron(Resource):
"""Resource to handle GET requests from cron service."""
def _its_time(self, cron_format):
"""Returns True if current time matches cron time spec."""
now = int(time.time())
itr = croniter(cron_format, now - 60)
nxt = itr.get_next()
return now / 60 * 60 == nxt
def get(self):
"""Finds and enqueues pipelines scheduled to be executed now."""
urlfetch.set_default_fetch_deadline(300)
for pipeline in Pipeline.where(run_on_schedule=True).all():
logging.info('Checking schedules for pipeline %s', pipeline.name)
for schedule in pipeline.schedules:
logging.info('Checking schedule with cron string %s', schedule.cron)
if self._its_time(schedule.cron):
logging.info('Trying to start pipeline %s', pipeline.name)
pipeline.start()
tracker = insight.GAProvider()
tracker.track_event(category='pipelines', action='scheduled_run')
break
return 'OK', 200
api.add_resource(Cron, '/cron')