54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from croniter import croniter
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from datetime import datetime
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from oslo_utils import timeutils
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from karbor import exception
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from karbor.i18n import _
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from karbor.services.operationengine.engine.triggers.timetrigger import \
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timeformats
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class Crontab(timeformats.TimeFormat):
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def __init__(self, start_time, pattern):
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self._start_time = start_time
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self._pattern = pattern
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super(Crontab, self).__init__(start_time, pattern)
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@classmethod
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def check_time_format(cls, pattern):
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if not pattern:
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msg = (_("The trigger pattern is None"))
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raise exception.InvalidInput(msg)
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try:
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croniter(pattern)
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except Exception:
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msg = (_("The trigger pattern(%s) is invalid") % pattern)
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raise exception.InvalidInput(msg)
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def compute_next_time(self, current_time):
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time = current_time if current_time >= self._start_time else (
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self._start_time)
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return croniter(self._pattern, time).get_next(datetime)
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def get_min_interval(self):
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try:
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t1 = self.compute_next_time(datetime.now())
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t2 = self.compute_next_time(t1)
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return timeutils.delta_seconds(t1, t2)
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except Exception:
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return None
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