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 Dockernet
   8 from mininet.node import Controller, OVSKernelSwitch, Switch, Docker, Host
   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, EmulatorCompute
  14
  15
  16 class DCNetwork(Dockernet):
  17     """
  18     Wraps the original Mininet/Dockernet 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, **kwargs):
  25         self.dcs = {}
  26         # create a Mininet/Dockernet network
  27         # call original Docker.__init__ and setup default controller
  28         Dockernet.__init__(
  29             self, controller=Controller, switch=OVSKernelSwitch, **kwargs)
  30         self.addController('c0')
  31
  32     def addDatacenter(self, label, metadata={}):
  33         """
  34         Create and add a logical cloud data center to the network.
  35         """
  36         if label in self.dcs:
  37             raise Exception("Data center label already exists: %s" % label)
  38         dc = Datacenter(label, metadata=metadata)
  39         dc.net = self  # set reference to network
  40         self.dcs[label] = dc
  41         dc.create()  # finally create the data center in our Mininet instance
  42         logging.info("added data center: %s" % label)
  43         return dc
  44
  45     def addLink(self, node1, node2, **params):
  46         """
  47         Able to handle Datacenter objects as link
  48         end points.
  49         """
  50         assert node1 is not None
  51         assert node2 is not None
  52         logging.debug("addLink: n1=%s n2=%s" % (str(node1), str(node2)))
  53         # ensure type of node1
  54         if isinstance( node1, basestring ):
  55             if node1 in self.dcs:
  56                 node1 = self.dcs[node1].switch
  57         if isinstance( node1, Datacenter ):
  58             node1 = node1.switch
  59         # ensure type of node2
  60         if isinstance( node2, basestring ):
  61             if node2 in self.dcs:
  62                 node2 = self.dcs[node2].switch
  63         if isinstance( node2, Datacenter ):
  64             node2 = node2.switch
  65         # try to give containers a default IP
  66         if isinstance( node1, Docker ):
  67             if not "params1" in params:
  68                 params["params1"] = {}
  69             if not "ip" in params["params1"]:
  70                 params["params1"]["ip"] = self.getNextIp()
  71         if isinstance( node2, Docker ):
  72             if not "params2" in params:
  73                 params["params2"] = {}
  74             if not "ip" in params["params2"]:
  75                 params["params2"]["ip"] = self.getNextIp()
  76
  77         return Dockernet.addLink(self, node1, node2, **params)  # TODO we need TCLinks with user defined performance here
  78
  79     def addDocker( self, label, **params ):
  80         """
  81         Wrapper for addDocker method to use custom container class.
  82         """
  83         return Dockernet.addDocker(self, label, cls=EmulatorCompute, **params)
  84
  85     def getAllContainers(self):
  86         """
  87         Returns a list with all containers within all data centers.
  88         """
  89         all_containers = []
  90         for dc in self.dcs.itervalues():
  91             all_containers += dc.listCompute()
  92         return all_containers
  93
  94     def start(self):
  95         # start
  96         for dc in self.dcs.itervalues():
  97             dc.start()
  98         Dockernet.start(self)
  99
 100     def stop(self):
 101         Dockernet.stop(self)
 102
 103     def CLI(self):
 104         CLI(self)