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module Gitlab
module Ci
class CronParser
VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'.freeze
VALID_SYNTAX_SAMPLE_CRON = '* * * * *'.freeze
def initialize(cron, cron_timezone = 'UTC')
@cron = cron
@cron_timezone = ActiveSupport::TimeZone.find_tzinfo(cron_timezone).name
end
def next_time_from(time)
@cron_line ||= try_parse_cron(@cron, @cron_timezone)
@cron_line.next_time(time).in_time_zone(Time.zone) if @cron_line.present?
end
def cron_valid?
try_parse_cron(@cron, VALID_SYNTAX_SAMPLE_TIME_ZONE).present?
end
def cron_timezone_valid?
try_parse_cron(VALID_SYNTAX_SAMPLE_CRON, @cron_timezone).present?
end
private
# NOTE:
# cron_timezone can only accept timezones listed in TZInfo::Timezone.
# Aliases of Timezones from ActiveSupport::TimeZone are NOT accepted,
# because Rufus::Scheduler only supports TZInfo::Timezone.
#
# For example, those codes have the same effect.
# Time.zone = 'Pacific Time (US & Canada)' (ActiveSupport::TimeZone)
# Time.zone = 'America/Los_Angeles' (TZInfo::Timezone)
#
# However, try_parse_cron only accepts the latter format.
# try_parse_cron('* * * * *', 'Pacific Time (US & Canada)') -> Doesn't work
# try_parse_cron('* * * * *', 'America/Los_Angeles') -> Works
# If you want to know more, please take a look
# https://github.com/rails/rails/blob/master/activesupport/lib/active_support/values/time_zone.rb
def try_parse_cron(cron, cron_timezone)
cron_line = Rufus::Scheduler.parse("#{cron} #{cron_timezone}")
cron_line if cron_line.is_a?(Rufus::Scheduler::CronLine)
rescue
# noop
end
end
end
end
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