Class: Fluent::MongostatInput

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ MongostatInput

Returns a new instance of MongostatInput.



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# File 'lib/fluent/plugin/in_mongostat.rb', line 10

def initialize
  super
end

Instance Method Details

#configure(conf) ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 25

def configure(conf)
  super

  if !mongostat_exists?
    raise ConfigError, '"mongostat" command not found.'
  end

  @command = %(mongostat #{@option} --json #{@refresh_interval})
  @hostname = get_hostname
end

#get_hostname ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 151

def get_hostname
  return `hostname`.chomp!
end

#mongostat_exists? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fluent/plugin/in_mongostat.rb', line 142

def mongostat_exists?
  begin
    `mongostat --version`
  rescue Errno::ENOENT
    return false
  end
  return true
end

#parse_line(line) ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 55

def parse_line(line)
  begin
    json_hash = JSON.parse(line.delete('*'))
  rescue JSON::ParserError
    raise ParserError, 'response json parse error'
  end

  status = json_hash.values[0]

  if status.has_key?('error')
    return status
  end

 if status.has_key?('command')
    status['command'] = status['command'].split('|')[0].to_i
  end

  if !status.has_key?('host')
    status['hostname'] = @hostname
  else
    status['hostname'] = status.delete('host')
  end

  if status.has_key?('arw')
    arw = status['arw'].split('|')
    status['arw'] = {'ar' => arw[0].to_i, 'aw' => arw[1].to_i}
  elsif status.has_key?('ar|aw')
    arw = status['ar|aw'].split('|')
    status.delete('ar|aw')
    status['arw'] = {'ar' => arw[0].to_i, 'aw' => arw[1].to_i}
  end

  if status.has_key?('qrw')
    qrw = status['qrw'].split('|')
    status['qrw'] = {'qr' => qrw[0].to_i, 'qw' => qrw[1].to_i}
  elsif status.has_key?('qr|qw')
    qrw = status['qr|qw'].split('|')
    status.delete('qr|qw')
    status['qrw'] = {'qr' => qrw[0].to_i, 'qw' => qrw[1].to_i}
  end

  if status.has_key?('netIn')
    status['net_in'] = status.delete('netIn')
  end

  if status.has_key?('netOut')
    status['net_out'] = status.delete('netOut')
  end

  status['conn'] = status['conn'].to_i if status.has_key?('conn')
  status['delete'] = status['delete'].to_i  if status.has_key?('delete')
  status['flushes'] = status['flushes'].to_i  if status.has_key?('flushes')
  status['getmore'] = status['getmore'].to_i  if status.has_key?('getmore')
  status['insert'] = status['insert'].to_i  if status.has_key?('insert')
  status['query'] = status['query'].to_i  if status.has_key?('query')
  status['update'] = status['update'].to_i  if status.has_key?('update')
  status['dirty'] = status['dirty'].to_f  if status.has_key?('dirty')
  status['used'] = status['used'].to_f  if status.has_key?('used')

  status['net_in'] = parse_unit(status['net_in']) if status.has_key?('net_in')
  status['net_out'] = parse_unit(status['net_out']) if status.has_key?('net_out')
  status['res'] = parse_unit(status['res']) if status.has_key?('res')
  status['vsize'] = parse_unit(status['vsize']) if status.has_key?('vsize')

  return status
end

#parse_unit(str) ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 122

def parse_unit(str)
  si_prefix = {
    'T'   =>  1e12,
    't'   =>  1e12,
    'G'   =>  1e9,
    'g'   =>  1e9,
    'M'   =>  1e6,
    'm'   =>  1e6,
    'K'   =>  1e3,
    'k'   =>  1e3
  }
  value = str.to_f
  unit = str[/[a-zA-Z]+/]
  if si_prefix.has_key?(unit)
    return (value * si_prefix[unit]).to_i
  else
    return value.to_i
  end
end

#run ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 46

def run
  Open3.popen3(@command) do |i, o, e, w|
    o.each do |line|
      status = parse_line(line)
      router.emit(@tag, Fluent::Engine.now, status)
    end
  end
end

#shutdown ⇒ Object 



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# File 'lib/fluent/plugin/in_mongostat.rb', line 41

def shutdown
  super
  Thread.kill(@thread)
end

#start ⇒ Object 



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

def start
  super
  @thread = Thread.new(&method(:run))
end