sfa/rspecs/elements/versions/pgv2Link.py

   1 from sfa.util.plxrn import PlXrn
   2 from sfa.util.xrn import Xrn
   3 from sfa.rspecs.elements.element import Element
   4 from sfa.rspecs.elements.link import Link
   5 from sfa.rspecs.elements.interface import Interface
   6 from sfa.rspecs.elements.property import Property
   7
   8 class PGv2Link:
   9     @staticmethod
  10     def add_links(xml, links):
  11         for link in links:
  12
  13             link_elem = xml.add_instance('link', link, ['component_name', 'component_id', 'client_id'])
  14             # set component manager element
  15             if 'component_manager' in link and link['component_manager']:
  16                 cm_element = link_elem.add_element('component_manager', name=link['component_manager'])
  17             # set interface_ref elements
  18             if link.get('interface1') and link.get('interface2'):
  19                 for if_ref in [link['interface1'], link['interface2']]:
  20                     link_elem.add_instance('interface_ref', if_ref, Interface.fields)
  21                 # set property elements
  22                 prop1 = link_elem.add_element('property', source_id = link['interface1']['component_id'],
  23                     dest_id = link['interface2']['component_id'], capacity=link['capacity'],
  24                     latency=link['latency'], packet_loss=link['packet_loss'])
  25                 prop2 = link_elem.add_element('property', source_id = link['interface2']['component_id'],
  26                     dest_id = link['interface1']['component_id'], capacity=link['capacity'],
  27                     latency=link['latency'], packet_loss=link['packet_loss'])
  28             if link.get('type'):
  29                 type_elem = link_elem.add_element('link_type', name=link['type'])
  30
  31     @staticmethod
  32     def get_links(xml):
  33         links = []
  34         link_elems = xml.xpath('//default:link | //link')
  35         for link_elem in link_elems:
  36             # set client_id, component_id, component_name
  37             link = Link(link_elem.attrib, link_elem)
  38
  39             # set component manager
  40             component_managers = link_elem.xpath('./default:component_manager | ./component_manager')
  41             if len(component_managers) > 0 and 'name' in component_managers[0].attrib:
  42                 link['component_manager'] = component_managers[0].attrib['name']
  43
  44             # set link type
  45             link_types = link_elem.xpath('./default:link_type | ./link_type')
  46             if len(link_types) > 0 and 'name' in link_types[0].attrib:
  47                 link['type'] = link_types[0].attrib['name']
  48
  49             # get capacity, latency and packet_loss from first property
  50             property_fields = ['capacity', 'latency', 'packet_loss']
  51             property_elems = link_elem.xpath('./default:property | ./property')
  52             if len(propery_elems) > 0:
  53                 prop = property_elems[0]
  54                 for attrib in ['capacity', 'latency', 'packet_loss']:
  55                     if attrib in prop:
  56                         link[attrib] = prop[attrib]
  57
  58             # get interfaces
  59             iface_elems = link_elem.xpath('./default:interface_ref | ./interface_ref')
  60             interfaces = [iface_elem.get_instance(Interface) for iface_elem in iface_elems]
  61             if len(interfaces) > 1:
  62                 link['interface1'] = interfaces[0]
  63                 link['interface2'] = interfaces[1]
  64             links.append(link)
  65         return links
  66
  67     @staticmethod
  68     def add_link_requests(xml, link_tuples, append=False):
  69         if not isinstance(link_tuples, set):
  70             link_tuples = set(link_tuples)
  71
  72         available_links = PGv2Link.get_links(xml)
  73         recently_added = []
  74         for link in available_links:
  75             if_name1 =  Xrn(link['interface1']['component_id']).get_leaf()
  76             if_name2 =  Xrn(link['interface2']['component_id']).get_leaf()
  77
  78             requested_link = None
  79             l_tup_1 = (if_name1, if_name2)
  80             l_tup_2 = (if_name2, if_name1)
  81             if link_tuples.issuperset([(if_name1, if_name2)]):
  82                 requested_link = (if_name1, if_name2)
  83             elif link_tuples.issuperset([(if_name2, if_name2)]):
  84                 requested_link = (if_name2, if_name1)
  85             if requested_link:
  86                 # add client id to link ane interface elements
  87                 link.element.set('client_id', link['component_name'])
  88                 link['interface1'].element.set('client_id', Xrn(link['interface1']['component_id']).get_leaf())
  89                 link['interface2'].element.set('client_id', Xrn(link['interface2']['component_id']).get_leaf())
  90                 recently_added.append(link['component_name'])
  91
  92         if not append:
  93             # remove all links that don't have a client id
  94             for link in PGv2Link.get_links(xml):
  95                 if not link['client_id'] or link['component_name'] not in recently_added:
  96                     parent = link.element.getparent()
  97                     parent.remove(link.element)
  98
  99     @staticmethod
 100     def get_link_requests(xml):
 101         link_requests = []
 102         for link in PGv2Link.get_links(xml):
 103             if link['client_id'] != None:
 104                 link_requests.append(link)
 105         return link_requests