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#--
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# CyborgHood, a distributed system management software.
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# Copyright (c) 2009-2011 Marc Dequènes (Duck) <Duck@DuckCorp.org>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#++
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require 'active_support/basic_object'
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require 'http_headers'
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require 'set'
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module CyborgHood
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module DSL
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class BaseDSL < ActiveSupport::BasicObject
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reveal :class
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reveal :logger
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end
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class TaskBase < BaseDSL
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attr_reader :bot, :name, :errors, :results, :preferred_locales, :locale, :user
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@@task_wip = 0
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def self.idle?
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@@task_wip == 0
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end
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# the name MUST be unique
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def initialize(bot, name, &block)
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@bot = bot
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@name = name
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@@task_wip += 1
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@errors = {}.freeze
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@results = {}.freeze
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@notification_name = "task/#{@name}"
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@preferred_locales = nil
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@locale = nil
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@user = nil
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_setup
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_start_dsl &block
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end
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def set_preferred_locales(prefs)
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_add_subtask("setting/preferred_locales") do |subtask|
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logger.debug "Task '#{@name}': setting preferred locales"
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lang_chooser = HTTPHeaders::AcceptLanguage.parse(prefs)
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if lang_chooser
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@preferred_locales = prefs
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ordered_list = lang_chooser.reduce(I18nController.instance.available_locales)
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@locale = ordered_list.empty? ? I18nController::DEFAULT_LOCALE : ordered_list.first.range
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logger.debug "Task '#{@name}': locale chosen: #{@locale}"
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else
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@errors << CyberError.new(:unrecoverable, "botnet/client/dsl", _("unparsable preferred locales"))
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end
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subtask.finish
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end
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end
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# temporary setting until Guard is created
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def set_user(user)
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_add_subtask("setting/user") do |subtask|
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logger.debug "Task '#{@name}': setting user to: #{user}"
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@user = user
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subtask.finish
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end
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end
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# may return a Hash of results
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def schedule(&job)
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_add_subtask("job/#{job.hash}") do |subtask|
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logger.debug "Task '#{@name}': Scheduling job"
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cb = Proc.new do
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subtask.finish
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end
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job_wrapper = Proc.new do
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job.call subtask
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end
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@bot.schedule_task(cb, job_wrapper)
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end
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end
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def send_notification(name, data)
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name = @notification_name if name == :task
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_add_subtask("notification/#{name}/out") do |subtask|
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logger.debug "Task '#{@name}': Sending notification to '#{name}'"
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chan = @bot.get_channel(name)
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chan << data
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subtask.finish
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end
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end
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def wait_notification(name, criterias = {}, timeout = nil, &cb)
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name = @notification_name if name == :task
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_add_subtask("notification/#{name}/in") do |subtask|
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logger.debug "Task '#{@name}': Waiting notification on '#{name}'"
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subcription_id = @bot.get_channel(name).subscribe do |msg|
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if _notification_criterias_match(msg, criterias)
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cb.call(subtask, msg)
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@bot.get_channel(name).unsubscribe(subcription_id) if subtask.finished?
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end
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end
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if timeout
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EventMachine.add_timer(timeout) do
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@bot.get_channel(name).unsubscribe(subcription_id)
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subtask.finish
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end
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end
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end
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end
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def wait_timer(timeout, repeat = false, &cb)
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_add_subtask("timer/#{timeout}/#{cb.hash}") do |subtask|
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periodic_timer_signature = nil
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timer_cb = Proc.new do
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if repeat
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cb.call(subtask)
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EventMachine.cancel_timer(periodic_timer_signature) if subtask.finished?
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else
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cb.call(subtask)
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subtask.finish
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end
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end
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if repeat
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periodic_timer_signature = EventMachine.add_periodic_timer(timeout, timer_cb)
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else
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EventMachine.add_timer(timeout, timer_cb)
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end
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end
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end
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# the name MUST be unique
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def task(name, &block)
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_add_subtask("task/#{name}") do |subtask|
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self.class.new(@bot, name, &block)
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subtask.finish
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end
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end
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def meet(task_list, meetpoint, retry_time = 2)
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task_list = [task_list] unless task_list.is_a? Array
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task_list = Set.new(task_list)
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notification_name = "meeting_point/#{meetpoint}"
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notifications_received = Set.new
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meet_ok = false
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wait_notification(notification_name, {:topic => "MEET"}) do |subtask, msg|
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notifications_received << msg[:from] if task_list.include?(msg[:from])
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if task_list == notifications_received
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meet_ok = true
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subtask.finish
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end
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end
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wait_timer(retry_time, true) do |subtask|
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# in this order: send a last message before leaving
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# (so we are sure the peer received a reply to its message)
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send_notification notification_name, {:topic => "MEET", :from => @name}
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subtask.finish if meet_ok
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end
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end
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# error when adding subtasks, as we cannot check callbacks
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# only applies to subsequently added tasks (wanted behavior)
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def cancel_on_start_error
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@cancel_on_start_error = true
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end
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def on_error(&cb)
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@error_cb = cb
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end
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def on_success(&cb)
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@success_cb = cb
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end
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def stop_bot(condition)
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_add_subtask('stop') do |subtask|
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case condition
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when :when_finished
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# try to stop gracefully
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@bot.try_stop
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when :at_once
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# it won't wait for anything to finish…
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@bot.stop
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end
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subtask.finish
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end
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end
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protected
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class Subtask
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attr_reader :name
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attr_accessor :results, :errors
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def initialize(task, name, &block)
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@task = task
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@name = name
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@block = block
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@finished = false
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@results = {}
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@errors = []
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end
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def do_it
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@block.call self
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rescue
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msg = "Task '#{@task.name}': error: " + $!.to_s
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logger.error msg
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@errors << CyberError.new(:unrecoverable, "botnet/client/dsl", msg)
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logger.debug $!.backtrace.join("\n")
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finish
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end
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def finish
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if @finished
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raise CyberError.new(:unrecoverable, "botnet/client/dsl", "Task '#{@task.name}': subtask should have ended, but it lied")
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end
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@finished = true
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logger.debug "Task '#{@task.name}': subtask '#{@name}' finished"
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@task.__send__(:_check_finished)
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end
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def finished?
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@finished
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end
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end
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def _add_subtask(name, cb = nil, &block)
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subtask = Subtask.new(self, name, &block)
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@subtasks << subtask
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subtask.do_it if @dsl_runing
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end
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def _subtasks_finished?
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@subtasks.each do |subtask|
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return false unless subtask.finished?
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end
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return true
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end
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def _check_finished
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return unless _subtasks_finished?
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# avoid race: no subtask will be run in this task now
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@dsl_runing = false
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# compute step result
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@errors = {}
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@results = {}
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@subtasks.each do |subtask|
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@errors[subtask.name] = subtask.errors unless subtask.errors.empty?
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@results.merge!(subtask.results)
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end
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@errors.freeze
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@result.freeze
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# next step
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cb = @errors.empty? ? @success_cb : @error_cb
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if cb
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_start_dsl(&cb)
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else
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_finished
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end
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end
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def _notification_criterias_match(msg, criterias)
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criterias.each_pair do |key, expected_val|
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val = msg[key]
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if expected_val.is_a? Regexp
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return false if val !~ expected_val
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else
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return false if val != expected_val
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end
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end
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true
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end
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def _setup
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logger.debug "Task '#{@name}': created"
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end
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def _start_dsl(&block)
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@dsl_runing = false
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@subtasks = []
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@cancel_on_start_error = false
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@error_cb = nil
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@success_cb = nil
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begin
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instance_eval(&block)
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rescue
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logger.error "Task '#{@name}': error in DSL: " + $!.to_s
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logger.debug $!.backtrace.join("\n")
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return
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end
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logger.debug "Task '#{@name}': begining step"
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if @subtasks.empty?
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_check_finished
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else
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@dsl_runing = true
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@subtasks.each do |subtask|
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# skip broken or canceled subtasks
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next if subtask.finished?
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subtask.do_it
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end
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end
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true
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end
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def _finished
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@@task_wip -= 1
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logger.debug "Task '#{@name}': finished (#{@@task_wip} remaining)"
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end
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end
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# this empty class is used as a trick to be able to inject features
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# as module.prepend does not exist yet
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class Task < TaskBase
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end
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end
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end
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