Class: RbbtProcessQueue::RbbtProcessQueueWorker

Inherits:
Object
  • Object
show all
Defined in:
lib/rbbt/util/concurrency/processes/worker.rb

Defined Under Namespace

Classes: Respawn

Constant Summary collapse

WORKER_ABORT_SIGNAL = 
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Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(queue, callback_queue = nil, cleanup = nil, respawn = false, offset = false, &block) ⇒ RbbtProcessQueueWorker

Returns a new instance of RbbtProcessQueueWorker.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 191

def initialize(queue, callback_queue = nil, cleanup = nil, respawn = false, offset = false, &block)
  @queue, @callback_queue, @cleanup, @block, @offset = queue, callback_queue, cleanup, block, offset

  @pid = Process.fork do
    Misc.pre_fork
    Log::ProgressBar.add_offset @offset if @offset

    @cleanup.call if @cleanup
    @queue.close_write 

    if @callback_queue
      Misc.purge_pipes(@callback_queue.swrite) 
      @callback_queue.close_read 
    else
      Misc.purge_pipes
    end

    if respawn
      run_with_respawn respawn
    else
      run
    end
    Log::ProgressBar.remove_offset @offset if @offset
  end
end

Instance Attribute Details

#block ⇒ Object (readonly)

Returns the value of attribute block.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def block
  @block
end

#callback_queue ⇒ Object (readonly)

Returns the value of attribute callback_queue.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def callback_queue
  @callback_queue
end

#cleanup ⇒ Object (readonly)

Returns the value of attribute cleanup.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def cleanup
  @cleanup
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def pid
  @pid
end

#queue ⇒ Object (readonly)

Returns the value of attribute queue.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def queue
  @queue
end

#stopping ⇒ Object (readonly)

Returns the value of attribute stopping.



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 4

def stopping
  @stopping
end

Instance Method Details

#abort ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 236

def abort
  begin
    Process.kill WORKER_ABORT_SIGNAL, @pid
  rescue Errno::ESRCH, Errno::ECHILD
  end
end

#abort_and_join ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 243

def abort_and_join
  self.abort

  begin
  Misc.insist([0,0.05,0.5,1,2]) do
    begin
      pid, status = Process.waitpid2 @pid, Process::WNOHANG
      Log.low "Abort and join of #{@pid}"
      return
    rescue Aborted
      abort
      raise 
    rescue ProcessFailed
      Log.low "Abort and join of #{@pid} (ProcessFailed)"
      return
    rescue Errno::ESRCH, Errno::ECHILD
      Log.low "Already joined worker #{@pid}"
      return
    end
  end
  rescue Aborted
    retry
  end

  begin
    Log.low "Forcing abort of #{@pid}"
    Process.kill 9, @pid
    pid, status = Process.waitpid2 @pid
  rescue Errno::ESRCH, Errno::ECHILD
    Log.low "Force killed worker #{@pid}"
  end
end

#done? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 286

def done?
  begin
    Process.waitpid @pid, Process::WNOHANG
  rescue Errno::ECHILD
    true
  rescue
    false
  end
end

#join ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 217

def join
  return unless Misc.pid_exists? @pid
  begin
    pid, status = Process.waitpid2 @pid
    raise ProcessFailed.new @pid if not status.success?
  rescue Aborted
    self.abort
    raise Aborted
  rescue Errno::ESRCH, Errno::ECHILD
    Log.exception $!
  rescue ProcessFailed
    raise $!
  rescue Exception
    Log.exception $!
    raise $!
  end
end

#run ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 15

def run
  begin
    begin
      Signal.trap(:INT){ 
        Kernel.exit! -1
      }

      @respawn = false
      Signal.trap(:USR1){ 
        @respawn = true
      }

      @stop = false
      Signal.trap(:USR2){ 
        @stop = true
      }

      Signal.trap(WORKER_ABORT_SIGNAL){ 
        Log.high "Worker #{Process.pid} signaled to abort"
        Kernel.exit! -1
      }

      loop do
        p = @queue.pop

        next if p.nil?
        raise p if Exception === p
        raise p.first if Array === p and Exception === p.first

        begin
          res = @block.call *p
          @callback_queue.push res if @callback_queue
        rescue Respawn
          @callback_queue.push $!.payload if @callback_queue
          raise $!
        end

        raise Respawn if @respawn
        if @stop
          Log.high "Worker #{Process.pid} leaving"
          break
        end
      end
    rescue Respawn
      Kernel.exit! 28
    rescue ClosedStream
    rescue Interrupt,Aborted
      Log.high "Worker #{Process.pid} aborted"
    rescue SemaphoreInterrupted
      retry unless @stop 
      Log.high "Worker #{Process.pid} leaving"
    rescue Exception
      Log.high "Worker #{Process.pid} had exception: #{$!.message}"
      @callback_queue.push($!) if @callback_queue
      Kernel.exit! -1
    ensure
      @callback_queue.close_write if @callback_queue 
    end
  rescue Aborted
    Log.high "Worker #{Process.pid} aborted"
  end

  Log.high "Worker #{Process.pid} completed"
  Kernel.exit! 0
end

#run_with_respawn(multiplier = nil) ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 81

def run_with_respawn(multiplier = nil)
  multiplier = case multiplier
               when String
                 multiplier.to_s
               when Numeric
                 multiplier.to_i
               else
                 3
               end

  status = nil
  begin

    initial = Misc.memory_use(Process.pid)
    memory_cap = multiplier * initial

    @asked = false
    @monitored = false
    @monitor_thread = Thread.new do
      begin
        while true
          @monitored = true

          current_mem = @current ? Misc.memory_use(@current) : 0
          if current_mem > memory_cap and not @asked
            Log.medium "Worker #{@current} for #{Process.pid} asked to respawn -- initial: #{initial} - multiplier: #{multiplier} - cap: #{memory_cap} - current: #{current_mem}"
            RbbtSemaphore.synchronize(@callback_queue.write_sem) do
              Process.kill "USR1", @current if @current
            end
            @asked = true
          end
          sleep 2
        end
      rescue
        Log.exception $!
      end
    end

    while ! @monitored
      sleep 0.1
    end

    @current = nil
    Signal.trap(:INT){ 
      begin
        Process.kill :INT, @current if @current
      rescue Errno::ESRCH, Errno::ECHILD
      end
    }

    Signal.trap(:USR1){ 
      begin
        Process.kill :USR1, @current if @current
      rescue Errno::ESRCH, Errno::ECHILD
      end
    }

    Signal.trap(:USR2){ 
      begin
        Process.kill :USR2, @current if @current
      rescue Errno::ESRCH, Errno::ECHILD
      end
    }

    Signal.trap(WORKER_ABORT_SIGNAL){ 
      Log.high "Killing respawned process #{@current}"
      begin
        Process.kill WORKER_ABORT_SIGNAL, @current if @current
      rescue Errno::ESRCH, Errno::ECHILD
      end
    }

    @current = Process.fork do
      run
    end

    Log.debug "Worker for #{Process.pid} started with pid #{@current} -- initial: #{initial} - multiplier: #{multiplier} - cap: #{memory_cap}"

    while true
      @prev = @current
      pid, status = Process.waitpid2 @current
      code = status.to_i >> 8 
      break unless code == 28
      @current = Process.fork do
        run
      end
      @asked = false
      Log.high "Worker #{Process.pid} respawning from #{@prev} to #{@current}"
    end
  rescue Aborted, Interrupt
    Log.high "Worker #{Process.pid} aborted. Current #{@current} #{Misc.pid_exists?(@current) ? "exists" : "does not exist"}"
    Process.kill "INT", @current if Misc.pid_exists? @current
    @callback_queue.close_write if @callback_queue 
    Kernel.exit! 0
  rescue Exception
    raise $!
  ensure
    @monitor_thread.kill if @monitor_thread
    Process.kill "INT", @current if Misc.pid_exists? @current
    @callback_queue.close_write if @callback_queue 
  end

  if status
    Log.high "Worker #{@current} (respawner #{Process.pid} ) completed with status #{status}"
    Kernel.exit! status.to_i >> 8
  else
    Kernel.exit! -1
  end
end

#stop ⇒ Object 



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# File 'lib/rbbt/util/concurrency/processes/worker.rb', line 276

def stop
  begin
    @stoping = true
    Process.kill :USR2, @pid
  rescue Errno::ESRCH 
  rescue Exception
    Log.exception $!
  end
end