Class: Fluent::DstatInput

Inherits:
Input
  • Object
show all
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.



8
9
10
11
12
13
14
15
16
17
 
# File 'lib/fluent/plugin/in_dstat.rb', line 8

def initialize
  super

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

Instance Method Details

#check_dstat ⇒ Object 



53
54
55
56
57
58
59
 
# File 'lib/fluent/plugin/in_dstat.rb', line 53

def check_dstat
  now = Time.now
  if now - @last_time > @delay * 3
    $log.info "Process dstat(#{@pid}) is stopped. Last updated: #{@last_time}"
    restart
  end
end

#configure(conf) ⇒ Object 



40
41
42
43
44
45
46
47
48
49
50
51
 
# File 'lib/fluent/plugin/in_dstat.rb', line 40

def configure(conf)
  super

  @command = "#{@dstat_path} #{@option} --nocolor --output #{@tmp_file} #{@delay} > /dev/null 2>&1"
  @hostname = `#{@hostname_command}`.chomp!

  begin
    `#{@dstat_path} --version`
  rescue Errno::ENOENT
    raise ConfigError, "'#{@dstat_path}' command not found. Install dstat before run fluentd"
  end
end

#desc(description) ⇒ Object 



22
23
 
# File 'lib/fluent/plugin/in_dstat.rb', line 22

def desc(description)
end

#receive_lines(lines) ⇒ Object 



112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
 
# File 'lib/fluent/plugin/in_dstat.rb', line 112

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
        else
          @first_keys[index] = @first_keys[index].gsub(/\s/, '_')
        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
      }
      router.emit(@tag, Engine.now, record)
    end
    @line_number += 1
    @last_time = Time.now
  end

end

#restart ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
 
# File 'lib/fluent/plugin/in_dstat.rb', line 92

def restart
  Process.detach(@pid)
  begin
    Process.kill(:TERM, @pid)
  rescue Errno::ESRCH => e
    $log.error "unexpected death of a child process", :error=>e.to_s
    $log.error_backtrace
  end
  @dw.detach
  @tw.detach
  @line_number = 0

  @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 



83
84
85
86
87
88
89
90
 
# File 'lib/fluent/plugin/in_dstat.rb', line 83

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

#shutdown ⇒ Object 



74
75
76
77
78
79
80
81
 
# File 'lib/fluent/plugin/in_dstat.rb', line 74

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

#start ⇒ Object 



61
62
63
64
65
66
67
68
69
70
71
72
 
# File 'lib/fluent/plugin/in_dstat.rb', line 61

def start
  system("mkfifo #{@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