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 import time
   9 from subprocess import Popen
  10 import os
  11
  12 from mininet.net import Dockernet
  13 from mininet.node import Controller, DefaultController, OVSSwitch, OVSKernelSwitch, Docker, RemoteController
  14 from mininet.cli import CLI
  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, controller=RemoteController,
  31                  dc_emulation_max_cpu=1.0,  # fraction of overall CPU time for emulation
  32                  dc_emulation_max_mem=512,  # emulation max mem in MB
  33                  **kwargs):
  34         """
  35         Create an extended version of a Dockernet network
  36         :param dc_emulation_max_cpu: max. CPU time used by containers in data centers
  37         :param kwargs: path through for Mininet parameters
  38         :return:
  39         """
  40         self.dcs = {}
  41
  42         # call original Docker.__init__ and setup default controller
  43         Dockernet.__init__(
  44             self, switch=OVSKernelSwitch, **kwargs)
  45
  46         # Ryu management
  47         self.ryu_process = None
  48         if controller == RemoteController:
  49             # start Ryu controller
  50             self.startRyu()
  51
  52         # add the specified controller
  53         self.addController('c0', controller=controller)
  54
  55         # graph of the complete DC network
  56         self.DCNetwork_graph = nx.MultiDiGraph()
  57
  58         # monitoring agent
  59         self.monitor_agent = DCNetworkMonitor(self)
  60
  61         # initialize resource model registrar
  62         self.rm_registrar = ResourceModelRegistrar(
  63             dc_emulation_max_cpu, dc_emulation_max_mem)
  64
  65     def addDatacenter(self, label, metadata={}, resource_log_path=None):
  66         """
  67         Create and add a logical cloud data center to the network.
  68         """
  69         if label in self.dcs:
  70             raise Exception("Data center label already exists: %s" % label)
  71         dc = Datacenter(label, metadata=metadata, resource_log_path=resource_log_path)
  72         dc.net = self  # set reference to network
  73         self.dcs[label] = dc
  74         dc.create()  # finally create the data center in our Mininet instance
  75         logging.info("added data center: %s" % label)
  76         return dc
  77
  78     def addLink(self, node1, node2, **params):
  79         """
  80         Able to handle Datacenter objects as link
  81         end points.
  82         """
  83         assert node1 is not None
  84         assert node2 is not None
  85         logging.debug("addLink: n1=%s n2=%s" % (str(node1), str(node2)))
  86         # ensure type of node1
  87         if isinstance( node1, basestring ):
  88             if node1 in self.dcs:
  89                 node1 = self.dcs[node1].switch
  90         if isinstance( node1, Datacenter ):
  91             node1 = node1.switch
  92         # ensure type of node2
  93         if isinstance( node2, basestring ):
  94             if node2 in self.dcs:
  95                 node2 = self.dcs[node2].switch
  96         if isinstance( node2, Datacenter ):
  97             node2 = node2.switch
  98         # try to give containers a default IP
  99         if isinstance( node1, Docker ):
 100             if "params1" not in params:
 101                 params["params1"] = {}
 102             if "ip" not in params["params1"]:
 103                 params["params1"]["ip"] = self.getNextIp()
 104         if isinstance( node2, Docker ):
 105             if "params2" not in params:
 106                 params["params2"] = {}
 107             if "ip" not in params["params2"]:
 108                 params["params2"]["ip"] = self.getNextIp()
 109         # ensure that we allow TCLinks between data centers
 110         # TODO this is not optimal, we use cls=Link for containers and TCLink for data centers
 111         # see Dockernet issue: https://github.com/mpeuster/dockernet/issues/3
 112         if "cls" not in params:
 113             params["cls"] = TCLink
 114
 115         link = Dockernet.addLink(self, node1, node2, **params)
 116
 117         # try to give container interfaces a default id
 118         node1_port_id = node1.ports[link.intf1]
 119         if isinstance(node1, Docker):
 120             if "id" in params["params1"]:
 121                 node1_port_id = params["params1"]["id"]
 122
 123         node2_port_id = node2.ports[link.intf2]
 124         if isinstance(node2, Docker):
 125             if "id" in params["params2"]:
 126                 node2_port_id = params["params2"]["id"]
 127
 128         # add edge and assigned port number to graph in both directions between node1 and node2
 129         # port_id: id given in descriptor (if available, otherwise same as port)
 130         # port: portnumber assigned by Dockernet
 131
 132         self.DCNetwork_graph.add_edge(node1.name, node2.name,
 133                                       attr_dict={'src_port_id': node1_port_id, 'src_port': node1.ports[link.intf1],
 134                                        'dst_port_id': node2_port_id, 'dst_port': node2.ports[link.intf2]})
 135         self.DCNetwork_graph.add_edge(node2.name, node1.name,
 136                                       attr_dict={'src_port_id': node2_port_id, 'src_port': node2.ports[link.intf2],
 137                                         'dst_port_id': node1_port_id, 'dst_port': node1.ports[link.intf1]})
 138
 139         return link
 140
 141     def addDocker( self, label, **params ):
 142         """
 143         Wrapper for addDocker method to use custom container class.
 144         """
 145         self.DCNetwork_graph.add_node(label)
 146         return Dockernet.addDocker(self, label, cls=EmulatorCompute, **params)
 147
 148     def removeDocker( self, label, **params ):
 149         """
 150         Wrapper for removeDocker method to update graph.
 151         """
 152         self.DCNetwork_graph.remove_node(label)
 153         return Dockernet.removeDocker(self, label, **params)
 154
 155     def addSwitch( self, name, add_to_graph=True, **params ):
 156         """
 157         Wrapper for addSwitch method to store switch also in graph.
 158         """
 159         if add_to_graph:
 160             self.DCNetwork_graph.add_node(name)
 161         return Dockernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', **params)
 162
 163     def getAllContainers(self):
 164         """
 165         Returns a list with all containers within all data centers.
 166         """
 167         all_containers = []
 168         for dc in self.dcs.itervalues():
 169             all_containers += dc.listCompute()
 170         return all_containers
 171
 172     def start(self):
 173         # start
 174         for dc in self.dcs.itervalues():
 175             dc.start()
 176         Dockernet.start(self)
 177
 178     def stop(self):
 179         # stop Ryu controller
 180         Dockernet.stop(self)
 181         self.stopRyu()
 182
 183     def CLI(self):
 184         CLI(self)
 185
 186     # to remove chain do setChain( src, dst, cmd='del-flows')
 187     def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, cmd='add-flow'):
 188
 189         #check if port is specified (vnf:port)
 190         if vnf_src_interface is None:
 191             # take first interface by default
 192             connected_sw = self.DCNetwork_graph.neighbors(vnf_src_name)[0]
 193             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 194             vnf_src_interface = link_dict[0]['src_port_id']
 195             #vnf_source_interface = 0
 196
 197         for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name):
 198             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 199             for link in link_dict:
 200                 #logging.info("{0},{1}".format(link_dict[link],vnf_source_interface))
 201                 if link_dict[link]['src_port_id'] == vnf_src_interface:
 202                     # found the right link and connected switch
 203                     #logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface))
 204                     src_sw = connected_sw
 205
 206                     src_sw_inport = link_dict[link]['dst_port']
 207                     break
 208
 209         if vnf_dst_interface is None:
 210             # take first interface by default
 211             connected_sw = self.DCNetwork_graph.neighbors(vnf_dst_name)[0]
 212             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 213             vnf_dst_interface = link_dict[0]['dst_port_id']
 214             #vnf_dest_interface = 0
 215
 216         vnf_dst_name = vnf_dst_name.split(':')[0]
 217         for connected_sw in self.DCNetwork_graph.neighbors(vnf_dst_name):
 218             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 219             for link in link_dict:
 220                 if link_dict[link]['dst_port_id'] == vnf_dst_interface:
 221                     # found the right link and connected switch
 222                     dst_sw = connected_sw
 223                     dst_sw_outport = link_dict[link]['src_port']
 224                     break
 225
 226
 227         # get shortest path
 228         #path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
 229         try:
 230             path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw)
 231         except:
 232             logging.info("No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name))
 233             return "No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 234
 235         logging.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path))
 236
 237         #current_hop = vnf_src_name
 238         current_hop = src_sw
 239         switch_inport = src_sw_inport
 240
 241         for i in range(0,len(path)):
 242             current_node = self.getNodeByName(current_hop)
 243             if path.index(current_hop) < len(path)-1:
 244                 next_hop = path[path.index(current_hop)+1]
 245             else:
 246                 #last switch reached
 247                 next_hop = vnf_dst_name
 248
 249             next_node = self.getNodeByName(next_hop)
 250
 251             if next_hop == vnf_dst_name:
 252                 switch_outport = dst_sw_outport
 253                 logging.info("end node reached: {0}".format(vnf_dst_name))
 254             elif not isinstance( next_node, OVSSwitch ):
 255                 logging.info("Next node: {0} is not a switch".format(next_hop))
 256                 return "Next node: {0} is not a switch".format(next_hop)
 257             else:
 258                 # take first link between switches by default
 259                 index_edge_out = 0
 260                 switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 261
 262             # take into account that multiple edges are possible between 2 nodes
 263             index_edge_in = 0
 264
 265
 266             #switch_inport = self.DCNetwork_graph[current_hop][next_hop][index_edge_in]['dst_port']
 267
 268             #next2_hop = path[path.index(current_hop)+2]
 269             #index_edge_out = 0
 270             #switch_outport = self.DCNetwork_graph[next_hop][next2_hop][index_edge_out]['src_port']
 271             #switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 272
 273             #logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport, switch_outport))
 274             # set of entry via ovs-ofctl
 275             # TODO use rest API of ryu to set flow entries to correct witch dpid
 276             if isinstance( current_node, OVSSwitch ):
 277                 match = 'in_port=%s' % switch_inport
 278
 279                 if cmd=='add-flow':
 280                     action = 'action=%s' % switch_outport
 281                     s = ','
 282                     ofcmd = s.join([match,action])
 283                 elif cmd=='del-flows':
 284                     ofcmd = match
 285                 else:
 286                     ofcmd=''
 287
 288                 current_node.dpctl(cmd, ofcmd)
 289                 logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport,
 290                                                                                      switch_outport))
 291             # take first link between switches by default
 292             if isinstance( next_node, OVSSwitch ):
 293                 switch_inport = self.DCNetwork_graph[current_hop][next_hop][0]['dst_port']
 294                 current_hop = next_hop
 295
 296         return "path added between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 297         #return "destination node: {0} not reached".format(vnf_dst_name)
 298
 299     # start Ryu Openflow controller as Remote Controller for the DCNetwork
 300     def startRyu(self):
 301         # start Ryu controller with rest-API
 302         python_install_path = site.getsitepackages()[0]
 303         ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
 304         ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py'
 305         # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
 306         # Ryu still uses 6633 as default
 307         ryu_option = '--ofp-tcp-listen-port'
 308         ryu_of_port = '6653'
 309         ryu_cmd = 'ryu-manager'
 310         FNULL = open("/tmp/ryu.log", 'w')
 311         self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 312         # no learning switch
 313         #self.ryu_process = Popen([ryu_cmd, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 314         time.sleep(1)
 315
 316     def stopRyu(self):
 317         if self.ryu_process is not None:
 318             self.ryu_process.terminate()
 319             self.ryu_process.kill()
 320