Class: Spider::HTTP::Spawner

Inherits:
Object
  • Object
show all
Defined in:
lib/spiderfw/http/server.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(actions) ⇒ Spawner

Returns a new instance of Spawner.



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# File 'lib/spiderfw/http/server.rb', line 189

def initialize(actions)
    @actions = actions
end

Instance Attribute Details

#child_pid ⇒ Object (readonly)

Returns the value of attribute child_pid.



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# File 'lib/spiderfw/http/server.rb', line 187

def child_pid
  @child_pid
end

Instance Method Details

#monitor_fs ⇒ Object 



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# File 'lib/spiderfw/http/server.rb', line 242

def monitor_fs
    require 'fssm'
    spawner = self
    action = 'spawn'
    return Thread.new do
        fsm_exclude = ['var', 'tmp']
        FSSM.monitor do
            #Spider.logger.debug("Monitoring #{Spider.paths[:apps]} for changes")
            path Spider.paths[:apps] do 
                glob '**/*.rb'

                update { |base, relative| 
                    Spider.logger.debug("#{relative} updated, restarting")
                    Process.kill 'KILL', Thread.current[:spawner_child_pid]
                    spawner.spawn(action)
                }
                delete { |base, relative|
                    Spider.logger.debug("#{relative} deleted, restarting")
                    Process.kill 'KILL', Thread.current[:spawner_child_pid]
                    spawner.spawn(action)
                }
                create { |base, relative|
                    Spider.logger.debug("#{relative} created, restarting")
                    Process.kill 'KILL', Thread.current[:spawner_child_pid]
                    spawner.spawn(action)
                }
            end
            # path Spider.paths[:root] do
            #     glob '**/*.shtml'
            #     
            #     update { |base, relative|
            #         puts "Changed #{base}, #{relative}"
            #         Spider::Template.cache.invalidate(File.join('ROOT', relative))
            #     }
            # end

            # path '/some/other/directory/' do
            #   update {|base, relative|}
            #   delete {|base, relative|}
            #   create {|base, relative|}
            # end
        end
    end
    
end

#run(action = nil) ⇒ Object 



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# File 'lib/spiderfw/http/server.rb', line 193

def run(action=nil)
    @monitor_thread = monitor_fs
    spawn(action)
    @monitor_thread.join
end

#spawn(action) ⇒ Object 



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# File 'lib/spiderfw/http/server.rb', line 199

def spawn(action)
    rd, wr = IO.pipe
    if pid = fork
        # Spawner
        Spider.logger.debug("Spawner forked")
        @child_pid = pid

        unless @already_forked
            Spider.main_process_startup
            exit_spawner = lambda{ 
                Spider.logger.debug "Spawner exiting" 
                Process.kill 'KILL', @monitor_thread[:spawner_child_pid]
            }
            Spider.on_main_process_shutdown(&exit_spawner)
            $SPIDER_SCRIPT ||= $0
            $0 = 'spider-spawner'
        end
        @already_forked = true

        wr.close
        @monitor_thread[:spawner_child_pid] = pid
        # TODO
        # msg = rd.read(5)
        # rd.close
        # spawn(msg) unless msg.blank?

    else
        # Child
        $SPIDER_SPAWNED = true
        trap('TERM'){ }
        trap('INT'){ }
        rd.close
        Spider.spawner = wr
        return unless @actions[action]
        begin
            @actions[action].call
        rescue Exception => exc
            Spider.logger.debug(exc)
            Process.kill 'KILL', Process.pid
        end
    end
end