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         """
  58         Able to handle Datacenter objects as link
  59         end points.
  60         """
  61         assert node1 is not None
  62         assert node2 is not None
  63         # ensure type of node1
  64         if isinstance( node1, basestring ):
  65             if node1 in self.dcs:
  66                 node1 = self.dcs[node1].switch
  67             elif node1 in self.switches:
  68                 node1 = self.switches[node1]
  69         if isinstance( node1, Datacenter ):
  70             node1 = node1.switch
  71         # ensure type of node2
  72         if isinstance( node2, basestring ):
  73             if node2 in self.dcs:
  74                 node2 = self.dcs[node2].switch
  75             elif node2 in self.switches:
  76                 node2 = self.switches[node2]
  77         if isinstance( node2, Datacenter ):
  78             node2 = node2.switch
  79         # create link if everything is correct
  80         if (node1 is not None and isinstance(node1, OVSKernelSwitch)
  81                 and node2 is not None and isinstance(node2, OVSKernelSwitch)):
  82             self.mnet.addLink(node1, node2)  # TODO we need TCLinks with user defined performance here
  83         else:
  84             raise Exception(
  85                 "one of the given nodes is not a Mininet switch or None")
  86
  87     def addDocker( self, name, **params ):
  88         """
  89         Wrapper for addDocker method provided by Dockernet.
  90         """
  91         return self.mnet.addDocker( name, **params)
  92
  93     def removeDocker( self, name, **params):
  94         """
  95         Wrapper for removeHost. Just to be complete.
  96         """
  97         return self.mnet.removeDocker(name, **params)
  98
  99     def start(self):
 100         # start
 101         for dc in self.dcs.itervalues():
 102             dc.start()
 103         self.mnet.start()
 104
 105     def stop(self):
 106         self.mnet.stop()
 107
 108     def CLI(self):
 109         CLI(self.mnet)