Unix cron implementation by Python
Project description
Cron Validator
Features
- Validate unix cron expression
- Match unit cron expression with specific datetime
- Generate match datetime between two datetime
- Schedule tasks
Install
pip install cron-validator
Run Tests
1. Install test requirements
pip install -r requirements/test.txt
2. Run tests (with coverage if wished)
pytest --cov=. test/
Sample
1. Validate unix cron expression
from cron_validator import CronValidator
assert CronValidator.parse('* * * * *') is not None # valid
assert CronValidator.parse('*/3 * * * *') is not None # valid
assert CronValidator.parse('*/61 * * * *') is None # invalid
2. Match unit cron expression with specific datetime
from cron_validator import CronValidator
from cron_validator.util import str_to_datetime
dt_str = '2019-04-23 1:00'
dt = str_to_datetime(dt_str)
assert CronValidator.match_datetime("* * * * *", dt)
assert CronValidator.match_datetime("* * * 4 *", dt)
assert CronValidator.match_datetime("* * * 5 *", dt) is False
assert CronValidator.match_datetime("* * * 1-5 *", dt)
assert CronValidator.match_datetime("* * * 1-3 *", dt) is False
assert CronValidator.match_datetime("* * * 1/5 *", dt) is False
assert CronValidator.match_datetime("* * * * *", dt)
assert CronValidator.match_datetime("0 * * * *", dt)
assert CronValidator.match_datetime("0-30 * * * *", dt)
assert CronValidator.match_datetime("0/30 * * * *", dt)
3. Generate match datetime between two datetime
from cron_validator import CronValidator
from cron_validator.util import str_to_datetime
from_str = '2019-04-22 00:00'
to_str = '2019-04-23 23:59'
for dt in CronValidator.get_execution_time("0 0 * * *",
from_dt=str_to_datetime(from_str), to_dt=str_to_datetime(to_str)):
print(dt)
# Output:
# 2019-04-22 00:00:00+00:00
# 2019-04-23 00:00:00+00:00
4. Use scheduler for repetitive task
from cron_validator import CronScheduler
cron_string = "*/1 * * * *"
scheduler = CronScheduler(cron_string)
while True:
if scheduler.time_for_execution():
# Get's called every full minute (excluding first iteration)
print("Now is the next scheduled time.")
5. Use extended cron rules based on AWS EventBridge rules (from v1.0.6)
The cron validator supports partially extended rules based on the Amazon EvenBridge rule set. More info.
Currently we support:
- 'L' for day of the month and day of the week
- 'W' for day of the week.
from cron_validator import CronValidator
from cron_validator.util import str_to_datetime
from cron_validator.regexes import Version
dt_str = '2023-04-28 1:00'
dt = str_to_datetime(dt_str)
assert CronValidator.match_datetime("* * * * 30W", dt, version=Version.EB)
assert CronValidator.match_datetime("* * * * 5L", dt, version=Version.EB)
dt_str = "2022-02-28 1:00"
dt = str_to_datetime(dt_str)
assert CronValidator.match_datetime("* * L * *", dt, version=Version.EB)
License
This project is licensed under the MIT License - see the LICENSE.txt file for details
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