emuvim/dcemulator/net.py

   1 """
   2 Distributed Cloud Emulator (dcemulator)
   3 (c) 2015 by Manuel Peuster <manuel.peuster@upb.de>
   4 """
   5 import logging
   6
   7 from mininet.net import Mininet
   8 from mininet.node import Controller, OVSKernelSwitch, Switch
   9 from mininet.cli import CLI
  10 from mininet.log import setLogLevel, info
  11 from mininet.link import TCLink, Link
  12
  13 from node import Datacenter
  14
  15
  16 class DCNetwork(object):
  17     """
  18     Wraps the original Mininet class and provides
  19     methods to add data centers, switches, etc.
  20
  21     This class is used by topology definition scripts.
  22     """
  23
  24     def __init__(self):
  25         self.dcs = {}
  26         self.switches = {}
  27         self.links = []
  28
  29         # create a Mininet/Dockernet network
  30         setLogLevel('info')  # set Mininet loglevel
  31         self.mnet = Mininet(controller=Controller, switch=OVSKernelSwitch)
  32         self.mnet.addController('c0')
  33
  34     def addDatacenter(self, name):
  35         """
  36         Create and add a logical cloud data center to the network.
  37         """
  38         if name in self.dcs:
  39             raise Exception("Data center name already exists: %s" % name)
  40         dc = Datacenter(name)
  41         dc.net = self  # set reference to network
  42         self.dcs[name] = dc
  43         dc.create()  # finally create the data center in our Mininet instance
  44         logging.info("added data center: %s" % name)
  45         return dc
  46
  47     def addSwitch(self, name):
  48         """
  49         We can also add additional SDN switches between data centers.
  50         """
  51         s = self.mnet.addSwitch(name)
  52         self.switches[name] = s
  53         logging.info("added switch: %s" % name)
  54         return s
  55
  56     def addLink(self, node1, node2):
  57         assert node1 is not None
  58         assert node2 is not None
  59         # ensure type of node1
  60         if isinstance( node1, basestring ):
  61             if node1 in self.dcs:
  62                 node1 = self.dcs[node1].switch
  63             elif node1 in self.switches:
  64                 node1 = self.switches[node1]
  65         if isinstance( node1, Datacenter ):
  66             node1 = node1.switch
  67         # ensure type of node2
  68         if isinstance( node2, basestring ):
  69             if node2 in self.dcs:
  70                 node2 = self.dcs[node2].switch
  71             elif node2 in self.switches:
  72                 node2 = self.switches[node2]
  73         if isinstance( node2, Datacenter ):
  74             node2 = node2.switch
  75         # create link if everything is correct
  76         if (node1 is not None and isinstance(node1, OVSKernelSwitch)
  77                 and node2 is not None and isinstance(node2, OVSKernelSwitch)):
  78             self.mnet.addLink(node1, node2)  # TODO we need TCLinks with user defined performance here
  79         else:
  80             raise Exception(
  81                 "one of the given nodes is not a Mininet switch or None")
  82
  83     def start(self):
  84         # start
  85         for dc in self.dcs.itervalues():
  86             dc.start()
  87         self.mnet.start()
  88
  89     def stop(self):
  90         self.mnet.stop()
  91
  92     def CLI(self):
  93         CLI(self.mnet)