8b90fb6d47
There is inconsistent use of either `/usr/bin/python` or `/usr/bin/env python`. This makes for unexpected results when a user might be using a virtualenv. Change-Id: Ibb030f920a8869f9113ade70b66a921cc815060d
108 lines
3.5 KiB
Python
108 lines
3.5 KiB
Python
#!/usr/bin/env python
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This module creates a list of cron intervals for a node in a group of nodes
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# to ensure each node runs a cron in round robbin style.
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from __future__ import print_function
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import argparse
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import json
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import sys
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MINUTE_SPAN = 1
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HOUR_SPAN = 60
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DAY_SPAN = 24 * HOUR_SPAN
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WEEK_SPAN = 7 * DAY_SPAN
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def json_exit(msg=None, failed=False, changed=False):
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if type(msg) is not dict:
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msg = {'msg': str(msg)}
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msg.update({'failed': failed, 'changed': changed})
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print(json.dumps(msg))
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sys.exit()
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def generate(host_index, total_hosts, total_rotation_mins):
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min = '*'
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hour = '*'
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day = '*'
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crons = []
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if host_index >= total_hosts:
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return crons
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rotation_frequency = total_rotation_mins // total_hosts
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cron_min = rotation_frequency * host_index
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# Build crons for a week period
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if total_rotation_mins == WEEK_SPAN:
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day = cron_min // DAY_SPAN
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hour = (cron_min % DAY_SPAN) // HOUR_SPAN
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min = cron_min % HOUR_SPAN
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crons.append({'min': min, 'hour': hour, 'day': day})
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# Build crons for a day period
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elif total_rotation_mins == DAY_SPAN:
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hour = cron_min // HOUR_SPAN
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min = cron_min % HOUR_SPAN
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crons.append({'min': min, 'hour': hour, 'day': day})
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# Build crons for multiple of an hour
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elif total_rotation_mins % HOUR_SPAN == 0:
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for multiple in range(1, DAY_SPAN // total_rotation_mins + 1):
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time = cron_min
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if multiple > 1:
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time += total_rotation_mins * (multiple - 1)
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hour = time // HOUR_SPAN
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min = time % HOUR_SPAN
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crons.append({'min': min, 'hour': hour, 'day': day})
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# Build crons for multiple of a minute
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elif total_rotation_mins % MINUTE_SPAN == 0:
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for multiple in range(1, HOUR_SPAN // total_rotation_mins + 1):
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time = cron_min
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if multiple > 1:
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time += total_rotation_mins * (multiple - 1)
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min = time // MINUTE_SPAN
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crons.append({'min': min, 'hour': hour, 'day': day})
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return crons
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def main():
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parser = argparse.ArgumentParser(description='''Creates a list of cron
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intervals for a node in a group of nodes to ensure each node runs
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a cron in round robbin style.''')
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parser.add_argument('-t', '--time',
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help='Time in seconds for a token rotation cycle',
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required=True,
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type=int)
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parser.add_argument('-i', '--index',
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help='Index of host starting from 0',
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required=True,
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type=int)
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parser.add_argument('-n', '--number',
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help='Number of tokens that should exist',
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required=True,
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type=int)
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args = parser.parse_args()
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json_exit({'cron_jobs': generate(args.index, args.number, args.time)})
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if __name__ == "__main__":
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main()
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