Class: Fluent::DstatInput

Inherits:
Input
  • Object
show all
Includes:
Mixin::RewriteTagName
Defined in:
lib/fluent/plugin/in_dstat.rb

Defined Under Namespace

Classes: DstatCSVWatcher, TimerWatcher

Instance Method Summary collapse

Constructor Details

#initialize ⇒ DstatInput

Returns a new instance of DstatInput.



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# File 'lib/fluent/plugin/in_dstat.rb', line 8

def initialize
  super

  require 'csv'
  @line_number = 0
  @first_keys = []
  @second_keys = []
  @data_array = []
  @max_lines = 100
  @last_time = Time.now
end

Instance Method Details

#check_dstat ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 36

def check_dstat
  restart if (Time.now - @last_time) > @delay*3
end

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 29

def configure(conf)
  super

  @command = "#{@dstat_path} #{@option} --output #{@tmp_file} #{@delay}"
  @hostname = `#{@hostname_command}`.chomp!
end

#receive_lines(lines) ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 95

def receive_lines(lines)
  lines.each do |line|
    next if line == ""
    case @line_number
    when 0..1
    when 2
      line.delete!("\"")
      @first_keys = CSV.parse_line(line)
      pre_key = ""
      @first_keys.each_with_index do |key, index|
        if key.nil? || key == ""
          @first_keys[index] = pre_key
        end
        pre_key = @first_keys[index]
      end
    when 3
      line.delete!("\"")
      @second_keys = line.split(',')
      @first_keys.each_with_index do |key, index|
        @data_array[index] = {}
        @data_array[index][:first] = key
        @data_array[index][:second] = @second_keys[index]
      end
    else
      values = line.split(',')
      data = Hash.new { |hash,key| hash[key] = Hash.new {} }
      values.each_with_index do |v, index|
        data[@first_keys[index]][@second_keys[index]] = v
      end
      record = {
        'hostname' => @hostname,
        'dstat' => data
      }
      emit_tag = @tag.dup
      filter_record(emit_tag, Engine.now, record)
      Engine.emit(emit_tag, Engine.now, record)
    end

    if (@line_number % @max_lines) == (@max_lines - 1)
      @dw.detach
      File.truncate(@tmp_file, 0)
      @dw = DstatCSVWatcher.new(@tmp_file, &method(:receive_lines))
      @dw.attach(@loop)
    end

    @line_number += 1
    @last_time = Time.now
  end

end

#restart ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 71

def restart
  Process.detach(@pid)
  Process.kill(:TERM, @pid)
  @dw.detach
  @tw.detach
  @line_number = 0
  touch_or_truncate(@tmp_file)

  @io = IO.popen(@command, "r")
  @pid = @io.pid
  @dw = DstatCSVWatcher.new(@tmp_file, &method(:receive_lines))
  @dw.attach(@loop)
  @tw = TimerWatcher.new(1, true,  &method(:check_dstat))
  @tw.attach(@loop)
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 62

def run
  begin
    @loop.run
  rescue
    $log.error "unexpected error", :error=>$!.to_s
    $log.error_backtrace
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_dstat.rb', line 53

def shutdown
  Process.kill(:TERM, @pid)
  @dw.detach
  @tw.detach
  @loop.stop
  @thread.join
  File.delete(@tmp_file)
end

#start ⇒ Object 



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

def start
  touch_or_truncate(@tmp_file)
  @io = IO.popen(@command, "r")
  @pid = @io.pid

  @loop = Coolio::Loop.new
  @dw = DstatCSVWatcher.new(@tmp_file, &method(:receive_lines))
  @dw.attach(@loop)
  @tw = TimerWatcher.new(1, true,  &method(:check_dstat))
  @tw.attach(@loop)
  @thread = Thread.new(&method(:run))
end

#touch_or_truncate(file) ⇒ Object 



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

def touch_or_truncate(file)
  if File.exist?(file)
    File.truncate(file, 0)
  else
    `touch #{file}`
  end
end