Class: Cfruby::Scheduler::Scheduler

Inherits:
Object
  • Object
show all
Defined in:
lib/libcfruby/scheduler.rb

Overview

Base class implementation of a Scheduler interface

Instance Method Summary collapse

Instance Method Details

#schedule(program, schedule, user = 'root') ⇒ Object

Schedules program according to schedule (schedule takes standard crontab format). If program is already scheduled according to schedule the call will do nothing silently



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# File 'lib/libcfruby/scheduler.rb', line 26

def schedule(program, schedule, user='root')
	Cfruby.controller.attempt("adding \"#{program}\" to crontab", 'reversible', 'destructive') {
		tmp = Tempfile.new('cfruby-cron')
		output = Exec.exec('crontab -u ' + user + ' -l > ' + tmp.path)
		if(output[1].length > 0 && output[1][0] !~ /no crontab for/ )
			raise(SchedulerError, "Unable to get schedule for #{user}")
		end
		added = FileEdit.file_must_contain(tmp.path, "#{schedule} #{program}")
		if(added)
			output = Exec.exec("crontab -u #{user} #{Cfruby::Exec.shellescape(tmp.path)}")
			if(output[1].length > 0)
				raise(SchedulerError, "Unable to schedule \"#{program}\" - #{output[1][1].strip()}")
			end
		else
			Cfruby.controller.attempt_abort("No changes made")
		end
	}
end

#unschedule(regex, user = 'root') ⇒ Object

Removes any scheduled program that matches regex (regex may be given as a String or Regexp, or an Array of either)



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# File 'lib/libcfruby/scheduler.rb', line 48

def unschedule(regex, user='root')
	if(regex.kind_of?(Array))
		regex.each() { |r|
			unschedule(r)
		}
	end
	
	if regex.kind_of?(String)
		regex = Regexp.new(Regexp.escape(String))
	end
	
	Cfruby.controller.attempt("removing \"#{regex.source}\" from crontab", 'nonreversible', 'destructive') {
		if(!regex.kind_of?(Regexp))
			regex = Regexp.new(Regexp.escape(regex.to_s))
		end
		tmp = Tempfile.new('cfruby-cron')
		output = Exec.exec('crontab -u ' + user + ' -l > ' + tmp.path)
		if(output[1].length > 0 && output[1][0] !~ /no crontab for/)
			raise(SchedulerError, "Unable to remove \"#{regex.source()}\" from schedule - #{output[1][1].strip()}")
		end
		added = FileEdit.file_must_not_contain(tmp.path, regex)
		if(added)
			output = Exec.exec("crontab #{Cfruby::Exec.shellescape(tmp.path)}")
			if(output[1].length > 0)
				raise(SchedulerError, "Unable to remove \"#{regex.source()}\" from schedule - #{output[1][1].strip()}")
			end
		else
			Cfruby.controller.attempt_abort("No changes made")
		end
	}
end