Class: CopyTaskThread

Inherits:
BaseThread show all
Defined in:
lib/daemon/copy_task_thread.rb

Instance Method Summary collapse

Methods inherited from BaseThread

#initialize

Constructor Details

This class inherits a constructor from BaseThread

Instance Method Details

#calc_avg_count ⇒ Object 



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# File 'lib/daemon/copy_task_thread.rb', line 84

def calc_avg_count
  $copy_cont_avg = ($copy_count + $copy_cont_avg) / 2.0
end

#go(storage_name) ⇒ Object 



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# File 'lib/daemon/copy_task_thread.rb', line 2

def go(storage_name)
  return unless $tasks_copy[storage_name]
  Thread.current[:tasks_processed] = 0 unless Thread.current[:tasks_processed]
  while task = $tasks_copy[storage_name].shift do
    $curr_tasks << task
    $log.debug("CopyTaskThread(#{storage_name}): run task for item_storage ##{task.id}, copy_count=#{$copy_count}/#{$copy_cont_avg}, copy_speed=#{$copy_speed}")
    make_copy(task)
    $curr_tasks.delete(task)
    $log.debug("CopyTaskThread(#{storage_name}): finish task for item_storage ##{task.id}")
    Thread.current[:tasks_processed] += 1
    exit if $exit_signal
  end
end

#make_copy(task) ⇒ Object 



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# File 'lib/daemon/copy_task_thread.rb', line 16

def make_copy(task)
  begin
    task.reload
    if task.status != 'copy'
      $log.warn("Task ##{task.id} status #{task.status} != copy, skip")
      return
    end
  rescue
    $log.warn("Task ##{task.id} not found in db, skip")
    return
  end
  sleep 0.1 while $copy_count > FC::Var.get('daemon_copy_tasks_per_host_limit', 10).to_i
  limit = FC::Var.get_current_speed_limit
  speed_limit = nil
  if limit
    if $copy_count == 0
      $copy_speed = 0
      speed_limit = limit * 0.75
    elsif $copy_count <= $copy_cont_avg && (speed_limit = limit / $copy_cont_avg) < limit * 1.1 - $copy_speed
    else
      while (speed_limit = (limit - $copy_speed) * 0.75) < limit*0.1 do
        sleep 0.1
      end
    end
  end
  $copy_count += 1
  $copy_speed += speed_limit if speed_limit
  calc_avg_count()
  
  storage = $storages.detect{|s| s.name == task.storage_name}
  begin
    item = FC::Item.find(task.item_id)
  rescue Exception => e
    if e.message.match('Record not found')
      $log.warn("Item ##{task.item_id} not found before copy")
      task.delete
      return nil
    else 
      raise e
    end
  end
  return nil unless item && item.status == 'ready'
  available_src_storages = FC::ItemStorage.where("item_id = ? AND status = 'ready'", item.id)
                                          .map do |item_storage|
    $all_storages.detect { |a_storage| a_storage.name == item_storage.storage_name && a_storage.up? }
  end.compact

  # pref for current host
  src_storage = available_src_storages.detect { |src| src.host == storage.host }
  # pref for same dc
  src_storage = available_src_storages.detect { |src| src.dc == storage.dc } unless src_storage
  # random from available storages
  src_storage = available_src_storages.sample unless src_storage

  unless src_storage
    $log.warn("Item ##{item.id} #{item.name} has no ready item_storage or storage")
    return nil 
  end
  $log.debug("Copy from #{src_storage.name} to #{storage.name} #{storage.path}#{item.name}")
  item.copy_item_storage(src_storage, storage, task, false, speed_limit)
rescue Exception => e
  error "Copy item_storage error: #{e.message}; #{e.backtrace.join(', ')}", :item_id => task.item_id, :item_storage_id => task.id
  $curr_tasks.delete(task)
ensure 
  $copy_count -= 1 if $copy_count > 0
  $copy_speed -= speed_limit if speed_limit
end