Class: Riemann::Tools::Net

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

Constant Summary collapse

FREEBSD_MAPPING = 
{
  'collisions'       => 'tx colls',
  'dropped-packets'  => 'rx drop',
  'received-bytes'   => 'rx bytes',
  'received-packets' => 'rx packets',
  'received-errors'  => 'rx errs',
  'sent-bytes'       => 'tx bytes',
  'sent-packets'     => 'tx packets',
  'send-errors'      => 'tx errs',
}.freeze

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 ⇒ Net

Returns a new instance of Net.



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# File 'lib/riemann/tools/net.rb', line 14

def initialize
  super

  @old_state = nil
  @interfaces = if opts[:interfaces]
                  opts[:interfaces].reject(&:empty?).map(&:dup)
                else
                  []
                end
  @ignore_interfaces = opts[:ignore_interfaces].reject(&:empty?).map(&:dup)

  ostype = `uname -s`.chomp.downcase
  case ostype
  when 'freebsd'
    @state = method :freebsd_state
  else
    puts "WARNING: OS '#{ostype}' not explicitly supported. Falling back to Linux" unless ostype == 'linux'
    @state = method :linux_state
  end
end

Instance Method Details

#freebsd_state ⇒ Object 



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# File 'lib/riemann/tools/net.rb', line 54

def freebsd_state
  require 'json'

  state = {}

  all_stats = JSON.parse(`netstat -inb --libxo=json`)
  all_stats.dig('statistics', 'interface').select { |s| s['mtu'] }.each do |interface_stats|
    next unless report_interface?(interface_stats['name'])

    FREEBSD_MAPPING.each do |key, service|
      state["#{interface_stats['name']} #{service}"] = interface_stats[key]
    end
  end

  state
end

#linux_state ⇒ Object 



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# File 'lib/riemann/tools/net.rb', line 71

def linux_state
  f = File.read('/proc/net/dev')
  state = {}
  f.split("\n").each do |line|
    next unless line =~ /\A\s*([[:alnum:]-]+?):\s*([\s\d]+)\s*/

    iface = Regexp.last_match(1)

    next unless report_interface?(iface)

    ['rx bytes',
     'rx packets',
     'rx errs',
     'rx drop',
     'rx fifo',
     'rx frame',
     'rx compressed',
     'rx multicast',
     'tx bytes',
     'tx packets',
     'tx errs',
     'tx drop',
     'tx fifo',
     'tx colls',
     'tx carrier',
     'tx compressed',].map do |service|
      "#{iface} #{service}"
    end.zip( # rubocop:disable Style/MultilineBlockChain
      Regexp.last_match(2).split(/\s+/).map(&:to_i),
    ).each do |service, value|
      state[service] = value
    end
  end

  state
end

#report_interface?(iface) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/riemann/tools/net.rb', line 35

def report_interface?(iface)
  if !@interfaces.empty?
    @interfaces.any? { |pattern| iface.match?(pattern) }
  else
    @ignore_interfaces.none? { |pattern| iface.match?(pattern) }
  end
end

#tick ⇒ Object 



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# File 'lib/riemann/tools/net.rb', line 108

def tick
  state = @state.call

  if @old_state
    # Report services from `@old_state` that don't exist in `state` as expired
    @old_state.reject { |k| state.key?(k) }.each_key do |service|
      report(service: service.dup, state: 'expired')
    end

    # Report delta for services that have values in both `@old_state` and `state`
    state.each do |service, metric|
      next unless @old_state.key?(service)

      delta = metric - @old_state[service]
      svc_state = case service
                  when /drop$/, /errs$/
                    if delta.positive?
                      'warning'
                    else
                      'ok'
                    end
                  else
                    'ok'
                  end

      report(
        service: service.dup,
        metric: (delta.to_f / opts[:interval]),
        state: svc_state,
      )
    end
  end

  @old_state = state
end