Class: Fluent::ExecCronInput

Inherits:
Input
  • Object
show all
Defined in:
lib/fluent/plugin/in_exec_cron.rb

Constant Summary collapse

SUPPORTED_FORMAT = 
{
  'tsv' => :tsv,
  'json' => :json,
  'msgpack' => :msgpack,
}

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ExecCronInput

Returns a new instance of ExecCronInput.



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# File 'lib/fluent/plugin/in_exec_cron.rb', line 5

def initialize
  super
  require 'fluent/plugin/exec_util'
  require 'fluent/timezone'
  require 'parse-cron'
  require 'erb'
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_exec_cron.rb', line 40

def configure(conf)
  super

  if localtime = conf['localtime']
    @localtime = true
  elsif utc = conf['utc']
    @localtime = false
  end

  if conf['timezone']
    @timezone = conf['timezone']
    Fluent::Timezone.validate!(@timezone)
  end

  if !@tag && !@tag_key
    raise ConfigError, "'tag' or 'tag_key' option is required on exec input"
  end

  if @time_key
    if @time_format
      f = @time_format
      @time_parse_proc = Proc.new {|str| Time.strptime(str, f).to_i }
    else
      @time_parse_proc = Proc.new {|str| str.to_i }
    end
  end

  case @format
  when :tsv
    if @keys.empty?
      raise ConfigError, "keys option is required on exec input for tsv format"
    end
    @parser = ExecUtil::TSVParser.new(@keys, method(:on_message))
  when :json
    @parser = ExecUtil::JSONParser.new(method(:on_message))
  when :msgpack
    @parser = ExecUtil::MessagePackParser.new(method(:on_message))
  end

  begin
    @cron_parser = CronParser.new(@cron)
  rescue => e
    raise ConfigError, "invalid cron expression. [#{@cron}]"
  end
  @command = ERB.new(@command.gsub(/\$\{([^}]+)\}/, '<%= \1 %>'))
end

#run_periodic ⇒ Object 



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# File 'lib/fluent/plugin/in_exec_cron.rb', line 101

def run_periodic
  until @finished
    begin
      secs = @cron_parser.next(Time.now) - Time.now
      sleep secs
      io = IO.popen(@command.result(binding), "r")
      @parser.call(io)
      Process.waitpid(io.pid)
    rescue
      log.error "exec failed to run or shutdown child process", :error => $!.to_s, :error_class => $!.class.to_s
      log.warn_backtrace $!.backtrace
    end
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_exec_cron.rb', line 92

def shutdown
  @finished = true
  if @graceful_shutdown
    @thread.join
  else
    Thread.kill(@thread)
  end
end

#start ⇒ Object 



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# File 'lib/fluent/plugin/in_exec_cron.rb', line 87

def start
  @finished = false
  @thread = Thread.new(&method(:run_periodic))
end