Class: FluentdServer::SyncWorker

Inherits:
Object
  • Object
show all
Includes:
Logger
Defined in:
lib/fluentd_server/sync_worker.rb

Overview

reference: github.com/focuslight/focuslight/blob/master/lib/focuslight/worker.rb thanks!

Constant Summary collapse

DEFAULT_INTERVAL = 
60

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Logger

included, #logger, #logger=

Constructor Details

#initialize(opts = {}) ⇒ SyncWorker

Returns a new instance of SyncWorker.



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# File 'lib/fluentd_server/sync_worker.rb', line 17

def initialize(opts = {})
  @opts = opts
  @interval = opts[:interval] || FluentdServer::Config.sync_interval || DEFAULT_INTERVAL
  @signals = []
end

Instance Attribute Details

#interval ⇒ Object (readonly)

Returns the value of attribute interval.



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# File 'lib/fluentd_server/sync_worker.rb', line 11

def interval
  @interval
end

Class Method Details

.start(opts = {}) ⇒ Object 



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# File 'lib/fluentd_server/sync_worker.rb', line 13

def self.start(opts = {})
  self.new(opts).start
end

Instance Method Details

#start ⇒ Object 



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# File 'lib/fluentd_server/sync_worker.rb', line 28

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

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

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

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

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

    if childpid
      logger.warn("[sync] previous updater exists, skipping this time")
      next
    end

    childpid = fork do
      FluentdServer::SyncRunner.run(@opts)
    end
  end

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

#update_next! ⇒ Object 



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# File 'lib/fluentd_server/sync_worker.rb', line 23

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