49 lines
1.7 KiB
Ruby
49 lines
1.7 KiB
Ruby
module Gitlab
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module Ci
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class CronParser
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VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'.freeze
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VALID_SYNTAX_SAMPLE_CRON = '* * * * *'.freeze
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def initialize(cron, cron_timezone = 'UTC')
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@cron = cron
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@cron_timezone = ActiveSupport::TimeZone.find_tzinfo(cron_timezone).name
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end
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def next_time_from(time)
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@cron_line ||= try_parse_cron(@cron, @cron_timezone)
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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 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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private
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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 Rufus::Scheduler 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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cron_line = Rufus::Scheduler.parse("#{cron} #{cron_timezone}")
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cron_line if cron_line.is_a?(Rufus::Scheduler::CronLine)
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rescue
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# noop
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end
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end
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end
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end
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