Class: Riemann::Tools::Diskstats

Inherits:
Object
  • Object
show all
Includes:
Riemann::Tools
Defined in:
lib/riemann/tools/diskstats.rb

Constant Summary

Constants included from Riemann::Tools

VERSION

Instance Attribute Summary

Attributes included from Riemann::Tools

#argv

Instance Method Summary collapse

Methods included from Riemann::Tools

#attributes, #endpoint_name, included, #options, #report, #riemann, #run

Constructor Details

#initialize ⇒ Diskstats

Returns a new instance of Diskstats.



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# File 'lib/riemann/tools/diskstats.rb', line 13

def initialize
  super

  @old_state = nil
end

Instance Method Details

#state ⇒ Object 



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# File 'lib/riemann/tools/diskstats.rb', line 19

def state
  f = File.read('/proc/diskstats')
  state = f.split("\n").grep_v(/(ram|loop)/).each_with_object({}) do |line, s|
    next unless line =~ /^(?:\s+\d+){2}\s+([\w\d-]+) (.*)$/

    dev = Regexp.last_match(1)

    ['reads reqs',
     'reads merged',
     'reads sector',
     'reads time',
     'writes reqs',
     'writes merged',
     'writes sector',
     'writes time',
     'io reqs',
     'io time',
     'io weighted',].map do |service|
      "#{dev} #{service}"
    end.zip( # rubocop:disable Style/MultilineBlockChain
      Regexp.last_match(2).split(/\s+/).map(&:to_i),
    ).each do |service, value|
      s[service] = value
    end
  end

  # Filter interfaces
  if (is = opts[:devices])
    state = state.select do |service, _value|
      is.include? service.split.first
    end
  end

  if (ign = opts[:ignore_devices])
    state = state.reject do |service, _value|
      ign.include? service.split.first
    end
  end

  state
end

#tick ⇒ Object 



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# File 'lib/riemann/tools/diskstats.rb', line 61

def tick
  state = self.state

  if @old_state
    state.each do |service, metric|
      if service =~ /io reqs$/
        report(
          service: "diskstats #{service}",
          metric: metric,
          state: 'ok',
        )
      else
        delta = metric - @old_state[service]

        report(
          service: "diskstats #{service}",
          metric: (delta.to_f / opts[:interval]),
          state: 'ok',
        )
      end

      next unless service =~ /io time$/

      report(
        service: "diskstats #{service.gsub('time', 'util')}",
        metric: (delta.to_f / (opts[:interval] * 1000)),
        state: 'ok',
      )
    end
  end

  @old_state = state
end