sfa/rspecs/elements/versions/pgv2Link.py

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