libxml_sax.rb

require 'rubygems'
require 'xml/libxml'

Gmeta
  include XML::SaxParser::Callbacks

  def initialize
    @ganglia = {}
    @grid = nil
    @cluster = nil
    @host = nil
    @metric = nil
  end

  def on_start_element(element, attributes)
    if element == "GANGLIA_XML"
      @ganglia['version'] = attributes['VERSION']
    end

    if element == "GRID"
      @grid = attributes['NAME']
      @ganglia[@grid] = {}
    end

    if element == "CLUSTER"
      @cluster = attributes['NAME']
      @ganglia[@grid][@cluster] = { 'alive' => [] }
    end

    if element == "HOST"
      @host = attributes['NAME']
      if attributes['TN'].to_i < attributes['TMAX'].to_i * 4
        @ganglia[@grid][@cluster]['alive'] << @host
      end
      @ganglia[@grid][@cluster][@host] = { 'metrics' => {} }
      @ganglia[@grid][@cluster][@host]['ip'] = attributes['IP']
      @ganglia[@grid][@cluster][@host]['last_update'] = attributes['REPORTED']
    end

    if element == "METRIC"
      @metric = attributes['NAME']
      @ganglia[@grid][@cluster][@host]['metrics'][@metric] = {}
      @ganglia[@grid][@cluster][@host]['metrics'][@metric]['value'] = attributes['VAL']
      @ganglia[@grid][@cluster][@host]['metrics'][@metric]['type'] = attributes['TYPE']
      @ganglia[@grid][@cluster][@host]['metrics'][@metric]['units'] = attributes['UNITS']
      @ganglia[@grid][@cluster][@host]['metrics'][@metric]['slope'] = attributes['SLOPE']
    end

    if element == "EXTRA_ELEMENT"
      k = attributes['NAME'].downcase
      v = attributes['VAL'].downcase
      @ganglia[@grid][@cluster][@host]['metrics'][@metric][k] = v
    end
  end

  def on_end_document
#    puts @ganglia.inspect
  end

end

lparser = XML::SaxParser.file('ganglia.xml')
lparser.callbacks = Gmeta.new
lx_start = Time.now
lparser.parse
lx_end = Time.now


puts "LibXML Parsing: #{lx_end - lx_start}"