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 from sfa.rspecs.rspec_elements import RSpecElement, RSpecElements
   5
   6 class PGv2Link:
   7
   8     elements = {
   9         'link': RSpecElement(RSpecElements.LINK, '//default:link | //link'),
  10         'component_manager': RSpecElement(RSpecElements.COMPONENT_MANAGER, './default:component_manager | ./component_manager')
  11     }
  12
  13     @staticmethod
  14     def add_links(xml, links):
  15         for link in links:
  16             link_elem = etree.SubElement(xml, 'link')
  17             for attrib in ['component_name', 'component_id', 'client_id']:
  18                 if attrib in link and link[attrib]:
  19                     link_elem.set(attrib, link[attrib])
  20             if 'component_manager' in link and link['component_manager']:
  21                 cm_element = etree.SubElement(xml, 'component_manager', name=link['component_manager'])
  22             for if_ref in [link['interface1'], link['interface2']]:
  23                 if_ref_elem = etree.SubElement(xml, 'interface_ref')
  24                 for attrib in Interface.fields:
  25                     if attrib in if_ref and if_ref[attrib]:
  26                         if_ref_elem.attrib[attrib] = if_ref[attrib]
  27             prop1 = etree.SubElement(xml, 'property', source_id = link['interface1']['component_id'],
  28                 dest_id = link['interface2']['component_id'], capacity=link['capacity'],
  29                 latency=link['latency'], packet_loss=link['packet_loss'])
  30             prop2 = etree.SubElement(xml, 'property', source_id = link['interface2']['component_id'],
  31                 dest_id = link['interface1']['component_id'], capacity=link['capacity'],
  32                 latency=link['latency'], packet_loss=link['packet_loss'])
  33             if 'type' in link and link['type']:
  34                 type_elem = etree.SubElement(xml, 'link_type', name=link['type'])
  35
  36     @staticmethod
  37     def get_links(xml, namespaces=None):
  38         links = []
  39         link_elems = xml.xpath('//default:link', namespaces=namespaces)
  40         for link_elem in link_elems:
  41             # set client_id, component_id, component_name
  42             link = Link(link_elem.attrib)
  43             # set component manager
  44             cm = link_elem.xpath('./default:component_manager', namespaces=namespaces)
  45             if len(cm) >  0:
  46                 cm = cm[0]
  47                 if  'name' in cm.attrib:
  48                     link['component_manager'] = cm.attrib['name']
  49             # set link type
  50             link_types = link_elem.xpath('./default:link_type', namespaces=namespaces)
  51             if len(link_types) > 0:
  52                 link_type = link_types[0]
  53                 if 'name' in link_type.attrib:
  54                     link['type'] = link_type.attrib['name']
  55
  56             # get capacity, latency and packet_loss from first property
  57             props = link_elem.xpath('./default:property', namespaces=namespaces)
  58             if len(props) > 0:
  59                 prop = props[0]
  60                 for attrib in ['capacity', 'latency', 'packet_loss']:
  61                     if attrib in prop.attrib:
  62                         link[attrib] = prop.attrib[attrib]
  63
  64             # get interfaces
  65             if_elems = link_elem.xpath('./default:interface_ref', namespaces=namespaces)
  66             ifs = []
  67             for if_elem in if_elems:
  68                 if_ref = Interface(if_elem.attrib)
  69                 ifs.append(if_ref)
  70             if len(ifs) > 1:
  71                 link['interface1'] = ifs[0]
  72                 link['interface2'] = ifs[1]
  73             links.append(link)
  74         return links
  75