sfa/rspecs/elements/versions/pgv2Link.py

   1 from lxml import etree
   2 from sfa.rspecs.elements.link import Link
   3 from sfa.rspecs.elements.interface import Interface
   4
   5 class PGv2Link:
   6
   7     @staticmethod
   8     def add_links(xml, links):
   9         for link in links:
  10             link_elem = etree.SubElement(xml, 'link')
  11             for attrib in ['component_name', 'component_id', 'client_id']:
  12                 if attrib in link and link[attrib]:
  13                     link_elem.set(attrib, link[attrib])
  14             if 'component_manager' in link and link['component_manger']:
  15                 cm_element = etree.SubElement(xml, 'component_manager', name=link['component_manager'])
  16             for if_ref in [link['interface1'], link['interface2']]:
  17                 if_ref_elem = etree.SubElement(xml, 'interface_ref')
  18                 for attrib in Interface.fields:
  19                     if attrib in if_ref and if_ref[attrib]:
  20                         if_ref_elem[attrib] = if_ref[attrib]
  21             prop1 = etree.SubElement(xml, 'property', source_id = link['interface1']['component_id'],
  22                 dest_id = link['interface2']['component_id'], capacity=link['capacity'],
  23                 latency=link['latency'], packet_loss=link['packet_loss'])
  24             prop2 = etree.SubElement(xml, 'property', source_id = link['interface2']['component_id'],
  25                 dest_id = link['interface1']['component_id'], capacity=link['capacity'],
  26                 latency=link['latency'], packet_loss=link['packet_loss'])
  27             if 'type' in link and link['type']:
  28                 type_elem = etree.SubElement(xml, 'link_type', name=link['type'])
  29
  30     @staticmethod
  31     def get_links(xml, namespaces=None):
  32         links = []
  33         link_elems = xml.xpath('//default:link', namespaces=namespaces)
  34         for link_elem in link_elems:
  35             # set client_id, component_id, component_name
  36             link = Link(link_elem.attrib)
  37             # set component manager
  38             cm = link_elem.xpath('./default:component_manager', namespaces=namespaces)
  39             if len(cm) >  0:
  40                 cm = cm[0]
  41                 if  'name' in cm.attrib:
  42                     link['component_manager'] = cm.attrib['name']
  43             # set link type
  44             link_types = link_elem.xpath('./default:link_type', namespaces=namespaces)
  45             if len(link_types) > 0:
  46                 link_type = link_types[0]
  47                 if 'name' in link_type.attrib:
  48                     link['type'] = link_type.attrib['name']
  49
  50             # get capacity, latency and packet_loss from first property
  51             props = link_elem.xpath('./default:property', namespaces=namespaces)
  52             if len(props) > 0:
  53                 prop = props[0]
  54                 for attrib in ['capacity', 'latency', 'packet_loss']:
  55                     if attrib in prop.attrib:
  56                         link[attrib] = prop.attrib[attrib]
  57
  58             # get interfaces
  59             if_elems = link_elem.xpath('./default:interface_ref', namespaces=namespaces)
  60             ifs = []
  61             for if_elem in if_elems:
  62                 if_ref = Interface(if_elem.attrib)
  63                 ifs.append(if_ref)
  64             if len(ifs) > 1:
  65                 link['interface1'] = ifs[0]
  66                 link['interface2'] = ifs[1]
  67             links.append(link)
  68         return links
  69
  70