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356 lines
14 KiB
Python
356 lines
14 KiB
Python
# (c) 2020 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import absolute_import, division, print_function
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__metaclass__ = type
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DOCUMENTATION = """
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name: schedule_rruleset
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author: John Westcott IV (@john-westcott-iv)
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short_description: Generate an rruleset string
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requirements:
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- pytz
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- python-dateutil >= 2.7.0
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description:
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- Returns a string based on criteria which represents an rrule
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options:
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_terms:
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description:
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- The start date of the ruleset
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- Used for all frequencies
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- Format should be YYYY-MM-DD [HH:MM:SS]
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required: True
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type: str
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timezone:
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description:
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- The timezone to use for this rule
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- Used for all frequencies
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- Format should be as US/Eastern
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- Defaults to America/New_York
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type: str
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rules:
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description:
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- Array of rules in the rruleset
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type: list
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elements: dict
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required: True
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suboptions:
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frequency:
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description:
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- The frequency of the schedule
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- none - Run this schedule once
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- minute - Run this schedule every x minutes
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- hour - Run this schedule every x hours
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- day - Run this schedule every x days
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- week - Run this schedule weekly
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- month - Run this schedule monthly
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required: True
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choices: ['none', 'minute', 'hour', 'day', 'week', 'month']
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interval:
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description:
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- The repetition in months, weeks, days hours or minutes
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- Used for all types except none
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type: int
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end_on:
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description:
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- How to end this schedule
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- If this is not defined, this schedule will never end
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- If this is a positive integer, this schedule will end after this number of occurrences
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- If this is a date in the format YYYY-MM-DD [HH:MM:SS], this schedule ends after this date
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- Used for all types except none
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type: str
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bysetpos:
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description:
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- Specify an occurrence number, corresponding to the nth occurrence of the rule inside the frequency period.
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- A comma-separated list of positions (first, second, third, forth or last)
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type: string
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bymonth:
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description:
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- The months this schedule will run on
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- A comma-separated list which can contain values 0-12
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type: string
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bymonthday:
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description:
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- The day of the month this schedule will run on
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- A comma-separated list which can contain values 0-31
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type: string
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byyearday:
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description:
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- The year day numbers to run this schedule on
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- A comma-separated list which can contain values 0-366
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type: string
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byweekno:
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description:
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- The week numbers to run this schedule on
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- A comma-separated list which can contain values as described in ISO8601
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type: string
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byweekday:
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description:
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- The days to run this schedule on
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- A comma-separated list which can contain values sunday, monday, tuesday, wednesday, thursday, friday
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type: string
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byhour:
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description:
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- The hours to run this schedule on
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- A comma-separated list which can contain values 0-23
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type: string
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byminute:
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description:
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- The minutes to run this schedule on
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- A comma-separated list which can contain values 0-59
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type: string
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include:
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description:
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- If this rule should be included (RRULE) or excluded (EXRULE)
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type: bool
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default: True
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"""
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EXAMPLES = """
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- name: Create a ruleset for everyday except Sundays
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set_fact:
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complex_rule: "{{ lookup(awx.awx.schedule_rruleset, '2022-04-30 10:30:45', rules=rrules, timezone='UTC' ) }}"
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vars:
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rrules:
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- frequency: 'day'
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interval: 1
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- frequency: 'day'
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interval: 1
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byweekday: 'sunday'
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include: false
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"""
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RETURN = """
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_raw:
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description:
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- String in the rrule format
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type: string
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"""
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import re
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from ansible.module_utils.six import raise_from
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from ansible.plugins.lookup import LookupBase
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from ansible.errors import AnsibleError
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from datetime import datetime
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try:
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import pytz
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from dateutil import rrule
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except ImportError as imp_exc:
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LIBRARY_IMPORT_ERROR = imp_exc
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else:
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LIBRARY_IMPORT_ERROR = None
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class LookupModule(LookupBase):
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# plugin constructor
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def __init__(self, *args, **kwargs):
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if LIBRARY_IMPORT_ERROR:
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raise_from(AnsibleError('{0}'.format(LIBRARY_IMPORT_ERROR)), LIBRARY_IMPORT_ERROR)
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super().__init__(*args, **kwargs)
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self.frequencies = {
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'none': rrule.DAILY,
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'minute': rrule.MINUTELY,
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'hour': rrule.HOURLY,
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'day': rrule.DAILY,
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'week': rrule.WEEKLY,
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'month': rrule.MONTHLY,
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}
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self.weekdays = {
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'monday': rrule.MO,
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'tuesday': rrule.TU,
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'wednesday': rrule.WE,
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'thursday': rrule.TH,
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'friday': rrule.FR,
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'saturday': rrule.SA,
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'sunday': rrule.SU,
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}
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self.set_positions = {
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'first': 1,
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'second': 2,
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'third': 3,
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'fourth': 4,
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'last': -1,
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}
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@staticmethod
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def parse_date_time(date_string):
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try:
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return datetime.strptime(date_string, '%Y-%m-%d %H:%M:%S')
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except ValueError:
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return datetime.strptime(date_string, '%Y-%m-%d')
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def process_integer(self, field_name, rule, min_value, max_value, rule_number):
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# We are going to tolerate multiple types of input here:
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# something: 1 - A single integer
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# something: "1" - A single str
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# something: "1,2,3" - A comma separated string of ints
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# something: "1, 2,3" - A comma separated string of ints (with spaces)
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# something: ["1", "2", "3"] - A list of strings
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# something: [1,2,3] - A list of ints
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return_values = []
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# If they give us a single int, lets make it a list of ints
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if isinstance(rule[field_name], int):
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rule[field_name] = [rule[field_name]]
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# If its not a list, we need to split it into a list
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if not isinstance(rule[field_name], list):
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rule[field_name] = rule[field_name].split(',')
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for value in rule[field_name]:
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# If they have a list of strs we want to strip the str incase its space delineated
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if isinstance(value, str):
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value = value.strip()
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# If value happens to be an int (from a list of ints) we need to coerce it into a str for the re.match
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if not re.match(r"^\d+$", str(value)) or int(value) < min_value or int(value) > max_value:
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raise AnsibleError('In rule {0} {1} must be between {2} and {3}'.format(rule_number, field_name, min_value, max_value))
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return_values.append(int(value))
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return return_values
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def process_list(self, field_name, rule, valid_list, rule_number):
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return_values = []
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# If its not a list, we need to split it into a list
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if not isinstance(rule[field_name], list):
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rule[field_name] = rule[field_name].split(',')
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for value in rule[field_name]:
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value = value.strip().lower()
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if value not in valid_list:
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raise AnsibleError('In rule {0} {1} must only contain values in {2}'.format(rule_number, field_name, ', '.join(valid_list.keys())))
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return_values.append(valid_list[value])
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return return_values
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def run(self, terms, variables=None, **kwargs):
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if len(terms) != 1:
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raise AnsibleError('You may only pass one schedule type in at a time')
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# Validate the start date
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try:
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start_date = LookupModule.parse_date_time(terms[0])
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except Exception as e:
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raise_from(AnsibleError('The start date must be in the format YYYY-MM-DD [HH:MM:SS]'), e)
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if not kwargs.get('rules', None):
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raise AnsibleError('You must include rules to be in the ruleset via the rules parameter')
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# All frequencies can use a timezone but rrule can't support the format that AWX uses.
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# So we will do a string manip here if we need to
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timezone = 'America/New_York'
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if 'timezone' in kwargs:
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if kwargs['timezone'] not in pytz.all_timezones:
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raise AnsibleError('Timezone parameter is not valid')
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timezone = kwargs['timezone']
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rules = []
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got_at_least_one_rule = False
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for rule_index in range(0, len(kwargs['rules'])):
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rule = kwargs['rules'][rule_index]
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rule_number = rule_index + 1
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valid_options = [
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"frequency",
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"interval",
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"end_on",
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"bysetpos",
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"bymonth",
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"bymonthday",
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"byyearday",
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"byweekno",
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"byweekday",
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"byhour",
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"byminute",
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"include",
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]
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invalid_options = list(set(rule.keys()) - set(valid_options))
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if invalid_options:
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raise AnsibleError('Rule {0} has invalid options: {1}'.format(rule_number, ', '.join(invalid_options)))
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frequency = rule.get('frequency', None)
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if not frequency:
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raise AnsibleError("Rule {0} is missing a frequency".format(rule_number))
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if frequency not in self.frequencies:
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raise AnsibleError('Frequency of rule {0} is invalid {1}'.format(rule_number, frequency))
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rrule_kwargs = {
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'freq': self.frequencies[frequency],
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'interval': rule.get('interval', 1),
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'dtstart': start_date,
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}
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# If we are a none frequency we don't need anything else
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if frequency == 'none':
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rrule_kwargs['count'] = 1
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else:
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# All non-none frequencies can have an end_on option
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if 'end_on' in rule:
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end_on = rule['end_on']
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if re.match(r'^\d+$', end_on):
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rrule_kwargs['count'] = end_on
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else:
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try:
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rrule_kwargs['until'] = LookupModule.parse_date_time(end_on)
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except Exception as e:
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raise_from(
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AnsibleError('In rule {0} end_on must either be an integer or in the format YYYY-MM-DD [HH:MM:SS]'.format(rule_number)), e
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)
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if 'bysetpos' in rule:
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rrule_kwargs['bysetpos'] = self.process_list('bysetpos', rule, self.set_positions, rule_number)
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if 'bymonth' in rule:
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rrule_kwargs['bymonth'] = self.process_integer('bymonth', rule, 1, 12, rule_number)
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if 'bymonthday' in rule:
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rrule_kwargs['bymonthday'] = self.process_integer('bymonthday', rule, 1, 31, rule_number)
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if 'byyearday' in rule:
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rrule_kwargs['byyearday'] = self.process_integer('byyearday', rule, 1, 366, rule_number) # 366 for leap years
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if 'byweekno' in rule:
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rrule_kwargs['byweekno'] = self.process_integer('byweekno', rule, 1, 52, rule_number)
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if 'byweekday' in rule:
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rrule_kwargs['byweekday'] = self.process_list('byweekday', rule, self.weekdays, rule_number)
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if 'byhour' in rule:
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rrule_kwargs['byhour'] = self.process_integer('byhour', rule, 0, 23, rule_number)
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if 'byminute' in rule:
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rrule_kwargs['byminute'] = self.process_integer('byminute', rule, 0, 59, rule_number)
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try:
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generated_rule = str(rrule.rrule(**rrule_kwargs))
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except Exception as e:
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raise_from(AnsibleError('Failed to parse rrule for rule {0} {1}: {2}'.format(rule_number, str(rrule_kwargs), e)), e)
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# AWX requires an interval. rrule will not add interval if it's set to 1
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if rule.get('interval', 1) == 1:
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generated_rule = "{0};INTERVAL=1".format(generated_rule)
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if rule_index == 0:
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# rrule puts a \n in the rule instead of a space and can't handle timezones
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generated_rule = generated_rule.replace('\n', ' ').replace('DTSTART:', 'DTSTART;TZID={0}:'.format(timezone))
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else:
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# Only the first rule needs the dtstart in a ruleset so remaining rules we can split at \n
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generated_rule = generated_rule.split('\n')[1]
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# If we are an exclude rule we need to flip from an rrule to an ex rule
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if not rule.get('include', True):
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generated_rule = generated_rule.replace('RRULE', 'EXRULE')
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else:
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got_at_least_one_rule = True
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rules.append(generated_rule)
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if not got_at_least_one_rule:
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raise AnsibleError("A ruleset must contain at least one RRULE")
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rruleset_str = ' '.join(rules)
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# For a sanity check lets make sure our rule can parse. Not sure how we can test this though
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try:
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rules = rrule.rrulestr(rruleset_str)
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except Exception as e:
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raise_from(AnsibleError("Failed to parse generated rule set via rruleset {0}".format(e)), e)
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# return self.get_rrule(frequency, kwargs)
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return [rruleset_str]
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