102 lines
3.5 KiB
Ruby
102 lines
3.5 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Ci
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class CronParser
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VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'
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VALID_SYNTAX_SAMPLE_CRON = '* * * * *'
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class << self
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def parse_natural(expression, cron_timezone = 'UTC')
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new(Fugit::Nat.parse(expression)&.original, cron_timezone)
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end
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# This method generates compatible expressions that can be
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# parsed by Fugit::Nat.parse to generate a cron line.
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# It takes start date of the cron and cadence in the following format:
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# cadence = {
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# unit: 'day/week/month/year'
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# duration: 1
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# }
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def parse_natural_with_timestamp(starts_at, cadence)
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case cadence[:unit]
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when 'day' # Currently supports only 'every 1 day'.
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"#{starts_at.min} #{starts_at.hour} * * *"
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when 'week' # Currently supports only 'every 1 week'.
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"#{starts_at.min} #{starts_at.hour} * * #{starts_at.wday}"
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when 'month'
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unless [1, 3, 6, 12].include?(cadence[:duration])
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raise NotImplementedError, "The cadence #{cadence} is not supported"
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end
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"#{starts_at.min} #{starts_at.hour} #{starts_at.mday} #{fall_in_months(cadence[:duration], starts_at)} *"
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when 'year' # Currently supports only 'every 1 year'.
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"#{starts_at.min} #{starts_at.hour} #{starts_at.mday} #{starts_at.month} *"
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else
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raise NotImplementedError, "The cadence unit #{cadence[:unit]} is not implemented"
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end
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end
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def fall_in_months(offset, start_date)
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(1..(12 / offset)).map { |i| start_date.next_month(offset * i).month }.join(',')
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end
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end
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def initialize(cron, cron_timezone = 'UTC')
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@cron = cron
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@cron_timezone = timezone_name(cron_timezone)
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end
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def next_time_from(time)
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cron_line.next_time(time).utc.in_time_zone(Time.zone) if cron_line.present?
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end
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def previous_time_from(time)
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cron_line.previous_time(time).utc.in_time_zone(Time.zone) if cron_line.present?
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end
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def cron_valid?
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try_parse_cron(@cron, VALID_SYNTAX_SAMPLE_TIME_ZONE).present?
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end
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def cron_timezone_valid?
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try_parse_cron(VALID_SYNTAX_SAMPLE_CRON, @cron_timezone).present?
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end
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def match?(time)
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cron_line.match?(time)
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end
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private
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def timezone_name(timezone)
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ActiveSupport::TimeZone.find_tzinfo(timezone).name
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rescue TZInfo::InvalidTimezoneIdentifier
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timezone
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end
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# NOTE:
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# cron_timezone can only accept timezones listed in TZInfo::Timezone.
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# Aliases of Timezones from ActiveSupport::TimeZone are NOT accepted,
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# because Fugit::Cron only supports TZInfo::Timezone.
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#
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# For example, those codes have the same effect.
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# Time.zone = 'Pacific Time (US & Canada)' (ActiveSupport::TimeZone)
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# Time.zone = 'America/Los_Angeles' (TZInfo::Timezone)
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#
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# However, try_parse_cron only accepts the latter format.
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# try_parse_cron('* * * * *', 'Pacific Time (US & Canada)') -> Doesn't work
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# try_parse_cron('* * * * *', 'America/Los_Angeles') -> Works
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# If you want to know more, please take a look
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# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/values/time_zone.rb
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def try_parse_cron(cron, cron_timezone)
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Fugit::Cron.parse("#{cron} #{cron_timezone}")
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end
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def cron_line
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@cron_line ||= try_parse_cron(@cron, @cron_timezone)
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end
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end
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end
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end
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