Class: Gogetit::GogetLibvirt

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/providers/libvirt.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

#get_gateway, #ping_available?, #recognize_env, #ssh_available?, #symbolize_keys

Constructor Details

#initialize(conf, maas, logger) ⇒ GogetLibvirt

Returns a new instance of GogetLibvirt.



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# File 'lib/providers/libvirt.rb', line 13

def initialize(conf, maas, logger)
  @config = conf
  @conn = Libvirt::open(config[:libvirt][:url])
  @maas = maas
  @logger = logger
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/providers/libvirt.rb', line 11

def config
  @config
end

#conn ⇒ Object (readonly)

Returns the value of attribute conn.



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# File 'lib/providers/libvirt.rb', line 11

def conn
  @conn
end

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/providers/libvirt.rb', line 11

def logger
  @logger
end

#maas ⇒ Object (readonly)

Returns the value of attribute maas.



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# File 'lib/providers/libvirt.rb', line 11

def maas
  @maas
end

Instance Method Details

#add_nic(document, nic_conf) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 212

def add_nic(document, nic_conf)
  logger.info("Calling <#{__method__.to_s}>")
  template = File.read(config[:lib_dir] + "/template/nic.xml")
  doc = Oga.parse_xml(template)

  nic_conf.each do |nic|
    doc = Oga.parse_xml(template)
    doc.at_xpath('interface/source').attribute('network').value = nic[:network]
    doc.at_xpath('interface/source').attribute('portgroup').value = nic[:portgroup]
    document.at_xpath('domain/devices').children << doc.at_xpath('interface')
  end

  document
end

#create(name, conf_file = nil) ⇒ Object

subject.create(name: ‘test01’)



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# File 'lib/providers/libvirt.rb', line 46

def create(name, conf_file = nil)
  logger.info("Calling <#{__method__.to_s}>")
  if maas.domain_name_exists?(name) or domain_exists?(name)
    puts "Domain #{name} already exists! Please check both on MAAS and libvirt."
    return false
  end

  conf_file ||= config[:default_provider_conf_file]
  domain = symbolize_keys(YAML.load_file(conf_file))
  domain[:name] = name
  domain[:uuid] = SecureRandom.uuid

  dom = conn.define_domain_xml(define_domain(domain))
  maas.refresh_pods

  system_id = maas.get_system_id(domain[:name])
  maas.wait_until_state(system_id, 'Ready')
  logger.info("Calling to deploy...")
  maas.conn.request(:post, ['machines', system_id], {'op' => 'deploy'})
  maas.wait_until_state(system_id, 'Deployed')
  logger.info("#{domain[:name]} has been created.")
  true
end

#create_volume(pool_name, volume_doc) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 205

def create_volume(pool_name, volume_doc)
  logger.info("Calling <#{__method__.to_s}> to create volume in #{pool_name} pool.")
  pool = conn.lookup_storage_pool_by_name(pool_name)
  pool.create_volume_xml(volume_doc)
  pool.refresh
end

#define_domain(domain) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 105

def define_domain(domain)
  logger.info("Calling <#{__method__.to_s}>")
  template = File.read(config[:lib_dir] + '/template/domain.xml')
  doc = Oga.parse_xml(template)

  name = domain[:name]
  doc.at_xpath('domain/name').inner_text = name
  uuid = domain[:uuid]
  doc.at_xpath('domain/uuid').inner_text = uuid
  vcpu = domain[:vcpu].to_s
  doc.at_xpath('domain/vcpu').inner_text = vcpu
  memory = domain[:memory].to_s
  doc.at_xpath('domain/memory').inner_text = memory
  doc.at_xpath('domain/currentMemory').inner_text = memory

  doc = define_volumes(doc, domain)
  doc = add_nic(doc, domain[:nic])

  #print_xml(doc)
  #volumes.each do |v|
  #  print_xml(v)
  #end

  return Oga::XML::Generator.new(doc).to_xml
end

#define_volumes(document, domain) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 156

def define_volumes(document, domain)
  logger.info("Calling <#{__method__.to_s}>")
  disk_template = File.read(config[:lib_dir] + '/template/disk.xml')
  disk_doc = Oga.parse_xml(disk_template)
  volume_template = File.read(config[:lib_dir] + '/template/volume.xml')
  volume_doc = Oga.parse_xml(volume_template)

  defined_volumes = []

  # For root volume
  pool_path = get_pool_path(domain[:disk][:root][:pool])
  volume_name = "#{domain[:name]}_root_sda.qcow2"
  volume_file = pool_path + "/" + volume_name
  disk_doc.at_xpath('disk/source').attribute('file').value = volume_file
  document.at_xpath('domain/devices').children << disk_doc.at_xpath('disk')

  volume_doc.at_xpath('volume/name').inner_text = volume_name
  volume_doc.at_xpath('volume/target/path').inner_text = volume_file
  volume_doc.at_xpath('volume/capacity').inner_text = domain[:disk][:root][:capacity].to_s

  create_volume(domain[:disk][:root][:pool], Oga::XML::Generator.new(volume_doc).to_xml)
  defined_volumes << volume_doc

  # For data(secondary) volumes
  if domain[:disk][:data] != [] and domain[:disk][:data] != nil
    disk_index = 98
    domain[:disk][:data].each do |v|
      pool_path = get_pool_path(v[:pool])
      volume_index = "sd" + disk_index.chr
      volume_name = "#{domain[:name]}_data_#{volume_index}.qcow2"
      volume_file = pool_path + "/" + volume_name
      disk_doc = Oga.parse_xml(disk_template)
      disk_doc.at_xpath('disk/source').attribute('file').value = volume_file
      disk_doc.at_xpath('disk/target').attribute('dev').value = volume_index
      document.at_xpath('domain/devices').children << disk_doc.at_xpath('disk')

      volume_doc = Oga.parse_xml(volume_template)
      volume_doc.at_xpath('volume/name').inner_text = volume_name
      volume_doc.at_xpath('volume/target/path').inner_text = volume_file
      volume_doc.at_xpath('volume/capacity').inner_text = v[:capacity].to_s
      create_volume(v[:pool], Oga::XML::Generator.new(volume_doc).to_xml)
      defined_volumes << volume_doc
      disk_index += 1
    end
  end

  return document
end

#destroy(name) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 70

def destroy(name)
  logger.info("Calling <#{__method__.to_s}>")
  system_id = maas.get_system_id(name)
  if maas.machine_exists?(name)
    if maas.get_machine_state(system_id) == 'Deployed'
      logger.info("Calling to release...")
      maas.conn.request(:post, ['machines', system_id], {'op' => 'release'})
      maas.wait_until_state(system_id, 'Ready')
    end
    maas.conn.request(:delete, ['machines', system_id])
  end

  pools = []
  conn.list_storage_pools.each do |name|
    pools << self.conn.lookup_storage_pool_by_name(name)
  end

  dom = conn.lookup_domain_by_name(name)
  dom.destroy if dom.active?
  Oga.parse_xml(dom.xml_desc).xpath('domain/devices/disk/source').each do |d|
    pool_path = d.attribute('file').value.split('/')[0..2].join('/')
    pools.each do |p|
      if Oga.parse_xml(p.xml_desc).at_xpath('pool/target/path').inner_text == pool_path
        logger.info("Deleting volume in #{p.name} pool.")
        p.lookup_volume_by_name(d.attribute('file').value.split('/')[3]).delete
      end
    end
  end
  dom.undefine

  maas.refresh_pods
  logger.info("#{name} has been destroyed.")
  true
end

#domain_exists?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/providers/libvirt.rb', line 29

def domain_exists?(name)
  logger.info("Calling <#{__method__.to_s}>")
  get_domain_list.each do |d|
    return true if d == name
  end
  false
end

#get_domain_list ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 20

def get_domain_list
  logger.info("Calling <#{__method__.to_s}>")
  domains = []
  conn.list_all_domains.each do |d|
    domains << d.name
  end
  domains
end

#get_mac_addr(domain_name) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 37

def get_mac_addr(domain_name)
  logger.info("Calling <#{__method__.to_s}>")
   Oga.parse_xml(conn.lookup_domain_by_name(domain_name).xml_desc)
    .at_xpath('domain/devices/interface[1]/mac')
    .attribute('address')
    .value
end

#get_pool_path(pool) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 139

def get_pool_path(pool)
  logger.info("Calling <#{__method__.to_s}>")
  path = nil
  conn.list_all_storage_pools.each do |p|
    if p.name == pool
      pool_doc = Oga.parse_xml(p.xml_desc)
      path = pool_doc.at_xpath('pool/target/path').inner_text
    end
  end

  if path
    return path
  else
    raise 'No such pool found.'
  end
end

#print_xml(doc) ⇒ Object 



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# File 'lib/providers/libvirt.rb', line 131

def print_xml(doc)
  logger.info("Calling <#{__method__.to_s}>")
  output = REXML::Document.new(Oga::XML::Generator.new(doc).to_xml)
  formatter = REXML::Formatters::Pretty.new
  formatter.compact = true
  formatter.write(output, $stdout)
end