src/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 import site
   8 from subprocess import Popen
   9 import os
  10
  11 from mininet.net import Dockernet
  12 from mininet.node import Controller, OVSSwitch, OVSKernelSwitch, Switch, Docker, Host, RemoteController
  13 from mininet.cli import CLI
  14 from mininet.log import setLogLevel, info, debug
  15 from mininet.link import TCLink
  16 import networkx as nx
  17 from emuvim.dcemulator.monitoring import DCNetworkMonitor
  18 from emuvim.dcemulator.node import Datacenter, EmulatorCompute
  19 from emuvim.dcemulator.resourcemodel import ResourceModelRegistrar
  20
  21
  22 class DCNetwork(Dockernet):
  23     """
  24     Wraps the original Mininet/Dockernet class and provides
  25     methods to add data centers, switches, etc.
  26
  27     This class is used by topology definition scripts.
  28     """
  29
  30     def __init__(self, dc_emulation_max_cpu=1.0, **kwargs):
  31         """
  32         Create an extended version of a Dockernet network
  33         :param dc_emulation_max_cpu: max. CPU time used by containers in data centers
  34         :param kwargs: path through for Mininet parameters
  35         :return:
  36         """
  37         self.dcs = {}
  38
  39         # call original Docker.__init__ and setup default controller
  40         Dockernet.__init__(
  41             self, controller=RemoteController, switch=OVSKernelSwitch, **kwargs)
  42
  43         # ass a remote controller to be able to use Ryu
  44         self.addController('c0', controller=RemoteController)
  45
  46         # graph of the complete DC network
  47         self.DCNetwork_graph=nx.DiGraph()
  48
  49         # monitoring agent
  50         self.monitor_agent = DCNetworkMonitor(self)
  51
  52         # start Ryu controller
  53         self.startRyu()
  54
  55         # initialize resource model registrar
  56         self.rm_registrar = ResourceModelRegistrar(dc_emulation_max_cpu)
  57
  58     def addDatacenter(self, label, metadata={}):
  59         """
  60         Create and add a logical cloud data center to the network.
  61         """
  62         if label in self.dcs:
  63             raise Exception("Data center label already exists: %s" % label)
  64         dc = Datacenter(label, metadata=metadata)
  65         dc.net = self  # set reference to network
  66         self.dcs[label] = dc
  67         dc.create()  # finally create the data center in our Mininet instance
  68         logging.info("added data center: %s" % label)
  69         return dc
  70
  71     def addLink(self, node1, node2, **params):
  72         """
  73         Able to handle Datacenter objects as link
  74         end points.
  75         """
  76         assert node1 is not None
  77         assert node2 is not None
  78         logging.debug("addLink: n1=%s n2=%s" % (str(node1), str(node2)))
  79         # ensure type of node1
  80         if isinstance( node1, basestring ):
  81             if node1 in self.dcs:
  82                 node1 = self.dcs[node1].switch
  83         if isinstance( node1, Datacenter ):
  84             node1 = node1.switch
  85         # ensure type of node2
  86         if isinstance( node2, basestring ):
  87             if node2 in self.dcs:
  88                 node2 = self.dcs[node2].switch
  89         if isinstance( node2, Datacenter ):
  90             node2 = node2.switch
  91         # try to give containers a default IP
  92         if isinstance( node1, Docker ):
  93             if "params1" not in params:
  94                 params["params1"] = {}
  95             if "ip" not in params["params1"]:
  96                 params["params1"]["ip"] = self.getNextIp()
  97         if isinstance( node2, Docker ):
  98             if "params2" not in params:
  99                 params["params2"] = {}
 100             if "ip" not in params["params2"]:
 101                 params["params2"]["ip"] = self.getNextIp()
 102         # ensure that we allow TCLinks between data centers
 103         # TODO this is not optimal, we use cls=Link for containers and TCLink for data centers
 104         # see Dockernet issue: https://github.com/mpeuster/dockernet/issues/3
 105         if "cls" not in params:
 106             params["cls"] = TCLink
 107
 108         link = Dockernet.addLink(self, node1, node2, **params)
 109
 110         # add edge and assigned port number to graph in both directions between node1 and node2
 111         self.DCNetwork_graph.add_edge(node1.name, node2.name, \
 112                                       {'src_port': node1.ports[link.intf1], 'dst_port': node2.ports[link.intf2]})
 113         self.DCNetwork_graph.add_edge(node2.name, node1.name, \
 114                                        {'src_port': node2.ports[link.intf2], 'dst_port': node1.ports[link.intf1]})
 115
 116         return link
 117
 118     def addDocker( self, label, **params ):
 119         """
 120         Wrapper for addDocker method to use custom container class.
 121         """
 122         self.DCNetwork_graph.add_node(label)
 123         return Dockernet.addDocker(self, label, cls=EmulatorCompute, **params)
 124
 125     def removeDocker( self, label, **params ):
 126         """
 127         Wrapper for removeDocker method to update graph.
 128         """
 129         self.DCNetwork_graph.remove_node(label)
 130         return Dockernet.removeDocker(self, label, **params)
 131
 132     def addSwitch( self, name, add_to_graph=True, **params ):
 133         """
 134         Wrapper for addSwitch method to store switch also in graph.
 135         """
 136         if add_to_graph:
 137             self.DCNetwork_graph.add_node(name)
 138         return Dockernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', **params)
 139
 140     def getAllContainers(self):
 141         """
 142         Returns a list with all containers within all data centers.
 143         """
 144         all_containers = []
 145         for dc in self.dcs.itervalues():
 146             all_containers += dc.listCompute()
 147         return all_containers
 148
 149     def start(self):
 150         # start
 151         for dc in self.dcs.itervalues():
 152             dc.start()
 153         Dockernet.start(self)
 154
 155     def stop(self):
 156         # stop Ryu controller
 157         self.ryu_process.terminate()
 158         #self.ryu_process.kill()
 159         Dockernet.stop(self)
 160
 161     def CLI(self):
 162         CLI(self)
 163
 164     # to remove chain do setChain( src, dst, cmd='del-flows')
 165     def setChain(self, vnf_src_name, vnf_dst_name, cmd='add-flow'):
 166         # get shortest path
 167         path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
 168         logging.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path))
 169
 170         current_hop = vnf_src_name
 171         for i in range(0,len(path)):
 172             next_hop = path[path.index(current_hop)+1]
 173             next_node = self.getNodeByName(next_hop)
 174
 175             if next_hop == vnf_dst_name:
 176                 return "path added between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 177             elif not isinstance( next_node, OVSSwitch ):
 178                 logging.info("Next node: {0} is not a switch".format(next_hop))
 179                 return "Next node: {0} is not a switch".format(next_hop)
 180
 181
 182             switch_inport = self.DCNetwork_graph[current_hop][next_hop]['dst_port']
 183             next2_hop = path[path.index(current_hop)+2]
 184             switch_outport = self.DCNetwork_graph[next_hop][next2_hop]['src_port']
 185
 186             logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(next_node.name, switch_inport, switch_outport))
 187             # set of entry via ovs-ofctl
 188             # TODO use rest API of ryu to set flow entries to correct witch dpid
 189             if isinstance( next_node, OVSSwitch ):
 190                 match = 'in_port=%s' % switch_inport
 191
 192                 if cmd=='add-flow':
 193                     action = 'action=%s' % switch_outport
 194                     s = ','
 195                     ofcmd = s.join([match,action])
 196                 elif cmd=='del-flows':
 197                     ofcmd = match
 198                 else:
 199                     ofcmd=''
 200
 201                 next_node.dpctl(cmd, ofcmd)
 202
 203             current_hop = next_hop
 204
 205         return "destination node: {0} not reached".format(vnf_dst_name)
 206
 207     # start Ryu Openflow controller as Remote Controller for the DCNetwork
 208     def startRyu(self):
 209         # start Ryu controller with rest-API
 210         python_install_path = site.getsitepackages()[0]
 211         ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
 212         ryu_path2 =  python_install_path + '/ryu/app/ofctl_rest.py'
 213         # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
 214         # Ryu still uses 6633 as default
 215         ryu_option = '--ofp-tcp-listen-port'
 216         ryu_of_port = '6653'
 217         ryu_cmd =  'ryu-manager'
 218         FNULL = open(os.devnull, 'w')
 219         self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)