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cron.rb
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cron.rb
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module Fugit
class Cron
SPECIALS = {
'@reboot' => :reboot,
'@yearly' => '0 0 1 1 *',
'@annually' => '0 0 1 1 *',
'@monthly' => '0 0 1 * *',
'@weekly' => '0 0 * * 0',
'@daily' => '0 0 * * *',
'@midnight' => '0 0 * * *',
'@hourly' => '0 * * * *',
}
attr_reader :original, :zone
attr_reader :seconds, :minutes, :hours, :monthdays, :months, :weekdays, :timezone
class << self
def new(original)
parse(original)
end
def parse(s)
return s if s.is_a?(self)
s = SPECIALS[s] || s
return nil unless s.is_a?(String)
#p s; Raabro.pp(Parser.parse(s, debug: 3), colors: true)
h = Parser.parse(s)
return nil unless h
self.allocate.send(:init, s, h)
end
def do_parse(s)
parse(s) ||
fail(ArgumentError.new("not a cron string #{s.inspect}"))
end
end
def to_cron_s
@cron_s ||= begin
[
@seconds == [ 0 ] ? nil : (@seconds || [ '*' ]).join(','),
(@minutes || [ '*' ]).join(','),
(@hours || [ '*' ]).join(','),
(@monthdays || [ '*' ]).join(','),
(@months || [ '*' ]).join(','),
(@weekdays || [ [ '*' ] ]).map { |d| d.compact.join('#') }.join(','),
@timezone ? @timezone.name : nil
].compact.join(' ')
end
end
class TimeCursor
def initialize(t)
@t = t.is_a?(TimeCursor) ? t.time : t
@t.seconds = @t.seconds.to_i
end
def time; @t; end
def to_i; @t.to_i; end
%w[ year month day wday hour min sec wday_in_month ]
.collect(&:to_sym).each { |k| define_method(k) { @t.send(k) } }
def inc(i)
@t = @t + i
self
end
def dec(i); inc(-i); end
def inc_month
y = @t.year
m = @t.month + 1
if m == 13; m = 1; y += 1; end
@t = ::EtOrbi.make(y, m)
self
end
def inc_day; inc((24 - @t.hour) * 3600 - @t.min * 60 - @t.sec); end
def inc_hour; inc((60 - @t.min) * 60 - @t.sec); end
def inc_min; inc(60 - @t.sec); end
def inc_sec(seconds)
if sec = seconds.find { |s| s > @t.sec }
inc(sec - @t.sec)
else
inc(60 - @t.sec + seconds.first)
end
end
def dec_month
dec(@t.day * 24 * 3600 + @t.hour * 3600 + @t.min * 60 + @t.sec + 1)
end
def dec_day; dec(@t.hour * 3600 + @t.min * 60 + @t.sec + 1); end
def dec_hour; dec(@t.min * 60 + @t.sec + 1); end
def dec_min; dec(@t.sec + 1); end
def dec_sec(seconds)
target = seconds.reverse.find { |s| s < @t.sec } || seconds.last
inc(target - @t.sec)
end
end
def month_match?(nt); ( ! @months) || @months.include?(nt.month); end
def hour_match?(nt); ( ! @hours) || @hours.include?(nt.hour); end
def min_match?(nt); ( ! @minutes) || @minutes.include?(nt.min); end
def sec_match?(nt); ( ! @seconds) || @seconds.include?(nt.sec); end
def weekday_match?(nt)
return true if @weekdays.nil?
wd, hsh = @weekdays.find { |d, _| d == nt.wday }
return false unless wd
return true if hsh.nil?
phsh, nhsh = nt.wday_in_month
if hsh > 0
hsh == phsh # positive wday, from the beginning of the month
else
hsh == nhsh # negative wday, from the end of the month, -1 == last
end
end
def monthday_match?(nt)
return true if @monthdays.nil?
last = (TimeCursor.new(nt).inc_month.time - 24 * 3600).day + 1
@monthdays
.collect { |d| d < 1 ? last + d : d }
.include?(nt.day)
end
def day_match?(nt)
return weekday_match?(nt) || monthday_match?(nt) \
if @weekdays && @monthdays
return false unless weekday_match?(nt)
return false unless monthday_match?(nt)
true
end
def match?(t)
t = Fugit.do_parse_at(t)
month_match?(t) && day_match?(t) &&
hour_match?(t) && min_match?(t) && sec_match?(t)
end
def next_time(from=::EtOrbi::EoTime.now)
from = ::EtOrbi.make_time(from)
sfrom = from.strftime('%F/%T')
t = TimeCursor.new(from.translate(@timezone))
#
# the translation occurs in the timezone of
# this Fugit::Cron instance
loop do
(from.to_i == t.to_i) && (t.inc(1); next)
month_match?(t) || (t.inc_month; next)
day_match?(t) || (t.inc_day; next)
hour_match?(t) || (t.inc_hour; next)
min_match?(t) || (t.inc_min; next)
sec_match?(t) || (t.inc_sec(@seconds); next)
st = t.time.strftime('%F/%T')
(from, sfrom = t.time, st; next) if st == sfrom
#
# when transitioning out of DST, this prevents #next_time from
# yielding the same literal time twice in a row, see gh-6
break
end
t.time.translate(from.zone)
#
# the answer time is in the same timezone as the `from`
# starting point
end
def previous_time(from=::EtOrbi::EoTime.now)
from = ::EtOrbi.make_time(from)
t = TimeCursor.new(from.translate(@timezone))
loop do
#p [ :l, Fugit.time_to_s(t.time) ]
(from.to_i == t.to_i) && (t.inc(-1); next)
month_match?(t) || (t.dec_month; next)
day_match?(t) || (t.dec_day; next)
hour_match?(t) || (t.dec_hour; next)
min_match?(t) || (t.dec_min; next)
sec_match?(t) || (t.dec_sec(@seconds); next)
break
end
t.time.translate(from.zone)
end
# Mostly used as a #next_time sanity check.
# Avoid for "business" use, it's slow.
#
# 2017 is a non leap year (though it is preceded by
# a leap second on 2016-12-31)
#
# Nota bene: cron with seconds are not supported.
#
def brute_frequency(year=2017)
FREQUENCY_CACHE["#{to_cron_s}|#{year}"] ||=
begin
deltas = []
t = EtOrbi.make_time("#{year}-01-01") - 1
t0 = nil
t1 = nil
loop do
t1 = next_time(t)
deltas << (t1 - t).to_i if t0
t0 ||= t1
break if deltas.any? && t1.year > year
break if t1.year - t0.year > 7
t = t1
end
Frequency.new(deltas, t1 - t0)
end
end
SLOTS = [
[ :seconds, 1, 60 ],
[ :minutes, 60, 60 ],
[ :hours, 3600, 24 ],
[ :days, 24 * 3600, 365 ] ]
def rough_frequency
slots = SLOTS
.collect { |k, v0, v1|
a = (k == :days) ? rough_days : instance_variable_get("@#{k}")
[ k, v0, v1, a ] }
slots.each do |k, v0, _, a|
next if a == [ 0 ]
break if a != nil
return v0 if a == nil
end
slots.each do |k, v0, v1, a|
next unless a && a.length > 1
return (a + [ a.first + v1 ])
.each_cons(2)
.collect { |a0, a1| a1 - a0 }
.min * v0
end
slots.reverse.each do |k, v0, v1, a|
return v0 * v1 if a && a.length == 1
end
1 # second
end
class Frequency
attr_reader :span, :delta_min, :delta_max, :occurrences
attr_reader :span_years, :yearly_occurrences
def initialize(deltas, span)
@span = span
@delta_min = deltas.min; @delta_max = deltas.max
@occurrences = deltas.size
@span_years = span / (365 * 24 * 3600)
@yearly_occurrences = @occurrences.to_f / @span_years
end
def to_debug_s
{
dmin: Fugit::Duration.new(delta_min).deflate.to_plain_s,
dmax: Fugit::Duration.new(delta_max).deflate.to_plain_s,
ocs: occurrences,
spn: Fugit::Duration.new(span.to_i).deflate.to_plain_s,
spnys: span_years.to_i,
yocs: yearly_occurrences.to_i
}.collect { |k, v| "#{k}: #{v}" }.join(', ')
end
end
def to_a
[ @seconds, @minutes, @hours, @monthdays, @months, @weekdays ]
end
def to_h
{ seconds: @seconds,
minutes: @minutes,
hours: @hours,
monthdays: @monthdays,
months: @months,
weekdays: @weekdays }
end
def ==(o)
o.is_a?(::Fugit::Cron) && o.to_a == to_a
end
alias eql? ==
def hash
to_a.hash
end
protected
def rough_days
return nil if @weekdays == nil && @monthdays == nil
months = (@months || (1..12).to_a)
monthdays = months
.product(@monthdays || [])
.collect { |m, d|
d = 31 + d if d < 0
(m - 1) * 30 + d } # rough
weekdays = (@weekdays || [])
.collect { |d, w|
w ?
d + (w - 1) * 7 :
(0..3).collect { |ww| d + ww * 7 } }
.flatten
weekdays = months
.product(weekdays)
.collect { |m, d| (m - 1) * 30 + d } # rough
(monthdays + weekdays).sort
end
FREQUENCY_CACHE = {}
def init(original, h)
@original = original
@cron_s = nil # just to be sure
determine_seconds(h[:sec])
determine_minutes(h[:min])
determine_hours(h[:hou])
determine_monthdays(h[:dom])
determine_months(h[:mon])
determine_weekdays(h[:dow])
determine_timezone(h[:tz])
self
end
def expand(min, max, r)
sta, edn, sla = r
sla = nil if sla == 1 # don't get fooled by /1
return [ nil ] if sta.nil? && edn.nil? && sla.nil?
return [ sta ] if sta && edn.nil?
sla = 1 if sla == nil
sta = min if sta == nil
edn = max if edn == nil
sta, edn = edn, sta if sta > edn
(sta..edn).step(sla).to_a
end
def compact(key)
arr = instance_variable_get(key)
return instance_variable_set(key, nil) if arr.include?(nil)
# reductio ad astrum
arr.uniq!
arr.sort!
end
def determine_seconds(arr)
@seconds = (arr || [ 0 ]).inject([]) { |a, s| a.concat(expand(0, 59, s)) }
compact(:@seconds)
end
def determine_minutes(arr)
@minutes = arr.inject([]) { |a, m| a.concat(expand(0, 59, m)) }
compact(:@minutes)
end
def determine_hours(arr)
@hours = arr
.inject([]) { |a, h| a.concat(expand(0, 23, h)) }
.collect { |h| h == 24 ? 0 : h }
compact(:@hours)
end
def determine_monthdays(arr)
@monthdays = arr.inject([]) { |a, d| a.concat(expand(1, 31, d)) }
compact(:@monthdays)
end
def determine_months(arr)
@months = arr.inject([]) { |a, m| a.concat(expand(1, 12, m)) }
compact(:@months)
end
def determine_weekdays(arr)
@weekdays = []
arr.each do |a, z, s, h| # a to z, slash and hash
if h
@weekdays << [ a, h ]
elsif s
((a || 0)..(z || (a ? a : 6))).step(s < 1 ? 1 : s)
.each { |i| @weekdays << [ i ] }
elsif z
(a..z).each { |i| @weekdays << [ i ] }
elsif a
@weekdays << [ a ]
#else
end
end
@weekdays.each { |wd| wd[0] = 0 if wd[0] == 7 } # turn sun7 into sun0
@weekdays.uniq!
@weekdays = nil if @weekdays.empty?
end
def determine_timezone(z)
@zone, @timezone = z
end
module Parser include Raabro
WEEKDAYS = %w[ sunday monday tuesday wednesday thursday friday saturday ]
WEEKDS = WEEKDAYS.collect { |d| d[0, 3] }
MONTHS = %w[ - jan feb mar apr may jun jul aug sep oct nov dec ]
# piece parsers bottom to top
def s(i); rex(nil, i, /[ \t]+/); end
def star(i); str(nil, i, '*'); end
def hyphen(i); str(nil, i, '-'); end
def comma(i); str(nil, i, ','); end
def slash(i); rex(:slash, i, /\/\d\d?/); end
def core_mos(i); rex(:mos, i, /[0-5]?\d/); end # min or sec
def core_hou(i); rex(:hou, i, /(2[0-4]|[01]?[0-9])/); end
def core_dom(i); rex(:dom, i, /(-?(3[01]|[12][0-9]|0?[1-9])|last|l)/i); end
def core_mon(i); rex(:mon, i, /(1[0-2]|0?[1-9]|#{MONTHS[1..-1].join('|')})/i); end
def core_dow(i); rex(:dow, i, /([0-7]|#{WEEKDS.join('|')})/i); end
def dow_hash(i); rex(:hash, i, /#(-?[1-5]|last|l)/i); end
def mos(i); core_mos(i); end
def hou(i); core_hou(i); end
def dom(i); core_dom(i); end
def mon(i); core_mon(i); end
def dow(i); core_dow(i); end
def _mos(i); seq(nil, i, :hyphen, :mos); end
def _hou(i); seq(nil, i, :hyphen, :hou); end
def _dom(i); seq(nil, i, :hyphen, :dom); end
def _mon(i); seq(nil, i, :hyphen, :mon); end
def _dow(i); seq(nil, i, :hyphen, :dow); end
# r: range
def r_mos(i); seq(nil, i, :mos, :_mos, '?'); end
def r_hou(i); seq(nil, i, :hou, :_hou, '?'); end
def r_dom(i); seq(nil, i, :dom, :_dom, '?'); end
def r_mon(i); seq(nil, i, :mon, :_mon, '?'); end
def r_dow(i); seq(nil, i, :dow, :_dow, '?'); end
# sor: star or range
def sor_mos(i); alt(nil, i, :star, :r_mos); end
def sor_hou(i); alt(nil, i, :star, :r_hou); end
def sor_dom(i); alt(nil, i, :star, :r_dom); end
def sor_mon(i); alt(nil, i, :star, :r_mon); end
def sor_dow(i); alt(nil, i, :star, :r_dow); end
# sorws: star or range with[out] slash
def sorws_mos(i); seq(:elt, i, :sor_mos, :slash, '?'); end
def sorws_hou(i); seq(:elt, i, :sor_hou, :slash, '?'); end
def sorws_dom(i); seq(:elt, i, :sor_dom, :slash, '?'); end
def sorws_mon(i); seq(:elt, i, :sor_mon, :slash, '?'); end
def sorws_dow(i); seq(:elt, i, :sor_dow, :slash, '?'); end
def h_dow(i); seq(:elt, i, :core_dow, :dow_hash); end
def _sorws_dow(i); alt(nil, i, :h_dow, :sorws_dow); end
def list_sec(i); jseq(:sec, i, :sorws_mos, :comma); end
def list_min(i); jseq(:min, i, :sorws_mos, :comma); end
def list_hou(i); jseq(:hou, i, :sorws_hou, :comma); end
def list_dom(i); jseq(:dom, i, :sorws_dom, :comma); end
def list_mon(i); jseq(:mon, i, :sorws_mon, :comma); end
def list_dow(i); jseq(:dow, i, :_sorws_dow, :comma); end
def lsec_(i); seq(nil, i, :list_sec, :s); end
def lmin_(i); seq(nil, i, :list_min, :s); end
def lhou_(i); seq(nil, i, :list_hou, :s); end
def ldom_(i); seq(nil, i, :list_dom, :s); end
def lmon_(i); seq(nil, i, :list_mon, :s); end
alias ldow list_dow
def _tz_name(i)
rex(nil, i, / +[A-Z][a-zA-Z0-9+\-]+(\/[A-Z][a-zA-Z0-9+\-_]+){0,2}/)
end
def _tz_delta(i)
rex(nil, i, / +[-+]([01][0-9]|2[0-4]):?(00|15|30|45)/)
end
def _tz(i); alt(:tz, i, :_tz_delta, :_tz_name); end
def classic_cron(i)
seq(:ccron, i, :lmin_, :lhou_, :ldom_, :lmon_, :ldow, :_tz, '?')
end
def second_cron(i)
seq(:scron, i, :lsec_, :lmin_, :lhou_, :ldom_, :lmon_, :ldow, :_tz, '?')
end
def cron(i)
alt(:cron, i, :second_cron, :classic_cron)
end
# rewriting the parsed tree
def to_i(k, t)
s = t.string.downcase
(k == :mon && MONTHS.index(s)) ||
(k == :dow && WEEKDS.index(s)) ||
((k == :dom) && s[0, 1] == 'l' && -1) || # L, l, last
s.to_i
end
def rewrite_elt(k, t)
(a, z), others = t
.subgather(nil)
.partition { |tt| ![ :hash, :slash ].include?(tt.name) }
s = others.find { |tt| tt.name == :slash }
h = others.find { |tt| tt.name == :hash }
h = h ? h.string[1..-1] : nil
h = -1 if h && h.upcase[0, 1] == 'L'
h = h.to_i if h
a = a ? to_i(k, a) : nil
z = z ? to_i(k, z) : nil
a, z = z, a if a && z && a > z
[ a, z, s ? s.string[1..-1].to_i : nil, h ]
end
def rewrite_entry(t)
t
.subgather(:elt)
.collect { |et| rewrite_elt(t.name, et) }
end
def rewrite_tz(t)
s = t.string.strip
z = EtOrbi.get_tzone(s)
[ s, z ]
end
def rewrite_cron(t)
hcron = t
.sublookup(nil) # go to :ccron or :scron
.subgather(nil) # list min, hou, mon, ...
.inject({}) { |h, tt|
h[tt.name] = tt.name == :tz ? rewrite_tz(tt) : rewrite_entry(tt)
h }
z, tz = hcron[:tz]; return nil if z && ! tz
hcron
end
end
end
end