Class: One2Influx::VirtualMachine

Inherits:
OneObject
  • Object
show all
Defined in:
lib/one2influx/one_object/virtual_machine.rb

Overview

Representation of ONE virtual machine

Instance Attribute Summary

Attributes inherited from OneObject

#doc, #metrics, #tags

Instance Method Summary collapse

Methods inherited from OneObject

#method_missing, #serialize_as_points

Constructor Details

#initialize(xml, client, parent_host) ⇒ VirtualMachine

Returns a new instance of VirtualMachine.

Parameters:

  • xml (string) —

    representation of VM

  • client (OpenNebula::Client) —

    connection link to ONE API

  • parent_host (One2Influx::Host) —

    owner of this VM



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# File 'lib/one2influx/one_object/virtual_machine.rb', line 8

def initialize(xml, client, parent_host)
  # Load configuration
  @tag_names = $CFG.storage[:vm][:tags]
  @metric_names = $CFG.storage[:vm][:metrics]
  @custom_metric_names = $CFG.storage[:vm][:cust_metrics]

  # Assign tags inherited from parent host
  @tags = Hash.new
  $CFG.storage[:vm][:inh_tags].each do |name, value|
    @tags[name] = parent_host.tags[value.to_sym]
  end
  super(xml, client)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class One2Influx::OneObject

Instance Method Details

#get_MEMORY_PERC ⇒ float

Computes percentage usage of memory for virtual machine.

Values might go over 1.0 as there is an overhead

Returns:

  • (float) —

    current usage over max usage



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# File 'lib/one2influx/one_object/virtual_machine.rb', line 25

def get_MEMORY_PERC
  template_id = @doc.xpath('//TEMPLATE').first
  if template_id.nil? || template_id.content.nil?
    $LOG.error "Unable to get metric 'MEMORY_PERC' in #{self.class}."
    return
  end
  template_id = template_id.content
  template = OpenNebula::Template.new(OpenNebula::Template.build_xml(template_id), @client)
  rc = template.info
  raise rc.message if OpenNebula.is_error?(rc)

  doc = Nokogiri::XML(template.to_xml)
  ni_element = doc.xpath('//TEMPLATE/MEMORY').first
  puts @metrics
  if ni_element.nil? || @metrics[:MEMORY].nil?
    $LOG.error "Unable to get metric 'MEMORY_PERC' in #{self.class}."
    return
  end

  # Convert //TEMPLATE/MEMORY from MB to kB as //VM/CPU is in kB
  max_mem = ni_element.content.to_f * 1000.0

  @metrics[:MEMORY].to_f / max_mem
end