Module: Bj::Runner::Instance_Methods

Defined in:
lib/bj/runner.rb

Instance Method Summary collapse

Instance Method Details

#fill_morgue(options = {}) ⇒ Object 



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# File 'lib/bj/runner.rb', line 188

def fill_morgue options = {}
  Bj.logger.debug{ "filling the morgue..." }
  Bj.transaction(options) do
    now = Time.now
    jobs = Bj::Table::Job.find :all,
                               :conditions => ["state = 'running' and runner = ?", Bj.hostname]
    jobs.each do |job|
      Bj.logger.info{ "marking #{ job.id } (#{ job.command }) as dead." }
      job.state = 'dead'
      job.finished_at = now
      job.save!
    end
  end
end

#initialize(options = {}, &block) ⇒ Object 



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# File 'lib/bj/runner.rb', line 96

def initialize options = {}, &block
  options.to_options!
  @options, @block = options, block
end

#install_signal_handlers ⇒ Object 



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# File 'lib/bj/runner.rb', line 235

def install_signal_handlers
  trap('SIGHUP') do
    if sleeping?
      Bj.logger.debug{ "woke up!" }
      throw :wake_up
    else
      sighup true
    end
  end
end

#new_lifeline(ppid) ⇒ Object 



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# File 'lib/bj/runner.rb', line 219

def new_lifeline ppid
  Thread.new do
    loop do
      begin
        Process.kill 0, ppid
      rescue Errno::ESRCH
        STDERR.puts "parent #{ ppid } died"
        Kernel.exit 42
      end
      sleep 42 
    end
  end
end

#register(options = {}) ⇒ Object 



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# File 'lib/bj/runner.rb', line 266

def register options = {}
  Bj.transaction(options) do
    pid = Bj.config[Runner.key]
    if Util.alive?(pid)
      return false
    end
    Bj.config[Runner.key] = Process.pid
    at_exit{ unregister }
  end
end

#run ⇒ Object 



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# File 'lib/bj/runner.rb', line 101

def run
  wait = options[:wait] || 42
  limit = options[:limit]
  forever = options[:forever]
  ppid = options[:ppid]

  limit = false if forever
  wait = Integer wait
  loopno = 0
  thread = new_lifeline(ppid) if ppid

  Bj.chroot do
    register or exit!(EXIT::WARNING)
    Bj.logger.info{ "START" }
    fill_morgue
    install_signal_handlers

    loop do
      loopno += 1
      break if(limit and n > limit)

      Bj.logger.debug{ "loopno #{ loopno }" }

      sweep

      catch :no_jobs do
        loop do
          job = thread = stdout = stderr = nil

          Bj.transaction(options) do
            job = Bj::Table::Job.find :first,
                                      :conditions => "state = 'pending'",
                                      :order => "priority DESC, submitted_at ASC", 
                                      :limit => 1
            throw :no_jobs unless job

            Bj.logger.info{ "running #{ job.id } (#{ job.command })" }

            command = job.command
            env = job.env || {}
            stdin = job.stdin || ''
            stdout = job.stdout || ''
            stderr = job.stderr || ''
            started_at = Time.now

            q = Queue.new
            thread = Thread.new do
              Thread.current.abort_on_exception = true
              systemu command, :cwd=>Bj.rails_root, :env=>env, :stdin=>stdin, :stdout=>stdout, :stderr=>stderr do |pid|
                q << pid
              end
            end
            pid = q.pop

            job.state = "running"
            job.runner = Bj.hostname
            job.pid = pid
            job.started_at = started_at 
            job.save!
            job.update
          end

          exit_status = thread.value
          finished_at = Time.now

          Bj.transaction(options) do
            job = Bj::Table::Job.find job.id 
            break unless job
            job.state = "finished"
            job.finished_at = finished_at 
            job.stdout = stdout
            job.stderr = stderr
            job.exit_status = exit_status
            job.save!
            job.update
            Bj.logger.info{ "exit_status #{ job.exit_status }" }
          end
        end
      end

      sleep wait

      break unless(limit or limit == false)
    end
  end
end

#sleep(seconds) ⇒ Object 



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# File 'lib/bj/runner.rb', line 246

def sleep seconds
  if sighup
    sighup false
    return
  end
  Bj.logger.debug{ "sleeping #{ seconds }..." }
  catch :wake_up do
    begin
      @sleeping = true
      Kernel.sleep seconds
    ensure
      @sleeping = false
    end
  end
end

#sleeping? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bj/runner.rb', line 262

def sleeping?
  @sleeping
end

#sweep(options = {}) ⇒ Object 



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# File 'lib/bj/runner.rb', line 203

def sweep options = {}
  Bj.logger.debug{ "sweeping..." }
  Bj.transaction(options) do
    now = Time.now
    too_old = now - Bj.ttl
    jobs = Bj::Table::Job.find :all,
                               :conditions => ["(state = 'finished' or state = 'dead') and submitted_at < ?", too_old]
    jobs.each do |job|
      Bj.logger.info{ "archiving #{ job.id } (#{ job.command })." }
      hash = job.to_hash.update(:archived_at => now)
      Bj::Table::JobArchive.create! hash 
      job.destroy
    end
  end
end

#unregister(options = {}) ⇒ Object 



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# File 'lib/bj/runner.rb', line 277

def unregister options = {}
  Bj.transaction(options) do
    Bj.config.delete Runner.key
  end
end