Class: Focuslight::Worker

Inherits:
Object
  • Object
show all
Includes:
Logger
Defined in:
lib/focuslight/worker.rb

Constant Summary collapse

DEFAULT_RRD_UPDATE_WORKER_INTERVAL = 
300
WORKER_TARGET_VALUES = 
[:normal, :short]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logger

included, #logger, #logger=

Constructor Details

#initialize(opts) ⇒ Worker

Returns a new instance of Worker.

Raises:

  • (ArgumentError) 


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# File 'lib/focuslight/worker.rb', line 19

def initialize(opts)
  @interval = opts[:interval] || DEFAULT_RRD_UPDATE_INTERVAL
  @target = opts[:target] || :normal
  raise ArgumentError, "invalid worker target #{@target}" unless WORKER_TARGET_VALUES.include?(@target)

  @signals = []
end

Instance Attribute Details

#interval ⇒ Object (readonly)

Returns the value of attribute interval.



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# File 'lib/focuslight/worker.rb', line 13

def interval
  @interval
end

Class Method Details

.run(opts) ⇒ Object 



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# File 'lib/focuslight/worker.rb', line 15

def self.run(opts)
  Focuslight::Worker.new(opts).run
end

Instance Method Details

#data ⇒ Object 



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# File 'lib/focuslight/worker.rb', line 27

def data
  @data ||= Focuslight::Data.new
end

#rrd ⇒ Object 



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# File 'lib/focuslight/worker.rb', line 31

def rrd
  @rrd ||= Focuslight::RRD.new
end

#run ⇒ Object 



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# File 'lib/focuslight/worker.rb', line 40

def run
  Signal.trap(:INT){  @signals << :INT }
  Signal.trap(:HUP){  @signals << :HUP }
  Signal.trap(:TERM){ @signals << :TERM }
  Signal.trap(:PIPE, "IGNORE")

  update_next!
  logger.info("[#{@target}] first updater start in #{@next_time}")

  childpid = nil
  while sleep(0.5) do
    if childpid
      begin
        if Process.waitpid(childpid, Process::WNOHANG)
          #TODO: $? (Process::Status object)
          logger.debug("[#{@target}] update finished pid: #{childpid}, code: #{$? >> 8}")
          logger.debug("[#{@target}] next rader start in #{@next_time}")
          childpid = nil
        end
      rescue Errno::ECHILD
        logger.warn("[#{@target}] no child process");
        childpid = nil
      end
    end

    unless @signals.empty?
      logger.warn("[#{@target}] signals_received: #{@signals.join(',')}")
      break
    end

    next if Time.now < @next_time
    update_next!
    logger.debug("[#{@target}] (#{@next_time}) updater start")

    if childpid
      logger.warn("[#{@target}] Previous radar exists, skipping this time")
      next
    end

    childpid = fork do
      graphs = data().get_all_graph_all()
      graphs.each do |graph|
        logger.debug("[#{@target}] update #{graph.id}")
        rrd().update(graph, @target)
      end
    end
  end

  if childpid
    logger.warn("[#{@target}] waiting for updater process finishing")
    begin
      waitpid childpid
    rescue Errno::ECHILD
      # ignore
    end
  end
end

#update_next! ⇒ Object 



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# File 'lib/focuslight/worker.rb', line 35

def update_next!
  now = Time.now
  @next_time = now - ( now.to_i % @interval ) + @interval
end