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 class DCNetwork(Dockernet):
  22     """
  23     Wraps the original Mininet/Dockernet class and provides
  24     methods to add data centers, switches, etc.
  25
  26     This class is used by topology definition scripts.
  27     """
  28
  29     def __init__(self, controller=RemoteController,
  30                  dc_emulation_max_cpu=1.0,  # fraction of overall CPU time for emulation
  31                  dc_emulation_max_mem=512,  # emulation max mem in MB
  32                  **kwargs):
  33         """
  34         Create an extended version of a Dockernet network
  35         :param dc_emulation_max_cpu: max. CPU time used by containers in data centers
  36         :param kwargs: path through for Mininet parameters
  37         :return:
  38         """
  39         self.dcs = {}
  40
  41         # call original Docker.__init__ and setup default controller
  42         Dockernet.__init__(
  43             self, switch=OVSKernelSwitch, **kwargs)
  44
  45         # Ryu management
  46         self.ryu_process = None
  47         if controller == RemoteController:
  48             # start Ryu controller
  49             self.startRyu()
  50
  51         # add the specified controller
  52         self.addController('c0', controller=controller)
  53
  54         # graph of the complete DC network
  55         self.DCNetwork_graph = nx.MultiDiGraph()
  56
  57         # monitoring agent
  58         self.monitor_agent = DCNetworkMonitor(self)
  59
  60         # initialize resource model registrar
  61         self.rm_registrar = ResourceModelRegistrar(
  62             dc_emulation_max_cpu, dc_emulation_max_mem)
  63
  64     def addDatacenter(self, label, metadata={}, resource_log_path=None):
  65         """
  66         Create and add a logical cloud data center to the network.
  67         """
  68         if label in self.dcs:
  69             raise Exception("Data center label already exists: %s" % label)
  70         dc = Datacenter(label, metadata=metadata, resource_log_path=resource_log_path)
  71         dc.net = self  # set reference to network
  72         self.dcs[label] = dc
  73         dc.create()  # finally create the data center in our Mininet instance
  74         logging.info("added data center: %s" % label)
  75         return dc
  76
  77     def addLink(self, node1, node2, **params):
  78         """
  79         Able to handle Datacenter objects as link
  80         end points.
  81         """
  82         assert node1 is not None
  83         assert node2 is not None
  84         logging.debug("addLink: n1=%s n2=%s" % (str(node1), str(node2)))
  85         # ensure type of node1
  86         if isinstance( node1, basestring ):
  87             if node1 in self.dcs:
  88                 node1 = self.dcs[node1].switch
  89         if isinstance( node1, Datacenter ):
  90             node1 = node1.switch
  91         # ensure type of node2
  92         if isinstance( node2, basestring ):
  93             if node2 in self.dcs:
  94                 node2 = self.dcs[node2].switch
  95         if isinstance( node2, Datacenter ):
  96             node2 = node2.switch
  97         # try to give containers a default IP
  98         if isinstance( node1, Docker ):
  99             if "params1" not in params:
 100                 params["params1"] = {}
 101             if "ip" not in params["params1"]:
 102                 params["params1"]["ip"] = self.getNextIp()
 103         if isinstance( node2, Docker ):
 104             if "params2" not in params:
 105                 params["params2"] = {}
 106             if "ip" not in params["params2"]:
 107                 params["params2"]["ip"] = self.getNextIp()
 108         # ensure that we allow TCLinks between data centers
 109         # TODO this is not optimal, we use cls=Link for containers and TCLink for data centers
 110         # see Dockernet issue: https://github.com/mpeuster/dockernet/issues/3
 111         if "cls" not in params:
 112             params["cls"] = TCLink
 113
 114         link = Dockernet.addLink(self, node1, node2, **params)
 115
 116         # try to give container interfaces a default id
 117         node1_port_id = node1.ports[link.intf1]
 118         if isinstance(node1, Docker):
 119             if "id" in params["params1"]:
 120                 node1_port_id = params["params1"]["id"]
 121
 122         node2_port_id = node2.ports[link.intf2]
 123         if isinstance(node2, Docker):
 124             if "id" in params["params2"]:
 125                 node2_port_id = params["params2"]["id"]
 126
 127         # add edge and assigned port number to graph in both directions between node1 and node2
 128         # port_id: id given in descriptor (if available, otherwise same as port)
 129         # port: portnumber assigned by Dockernet
 130
 131         self.DCNetwork_graph.add_edge(node1.name, node2.name,
 132                                       attr_dict={'src_port_id': node1_port_id, 'src_port': node1.ports[link.intf1],
 133                                        'dst_port_id': node2_port_id, 'dst_port': node2.ports[link.intf2]})
 134         self.DCNetwork_graph.add_edge(node2.name, node1.name,
 135                                       attr_dict={'src_port_id': node2_port_id, 'src_port': node2.ports[link.intf2],
 136                                         'dst_port_id': node1_port_id, 'dst_port': node1.ports[link.intf1]})
 137
 138         return link
 139
 140     def addDocker( self, label, **params ):
 141         """
 142         Wrapper for addDocker method to use custom container class.
 143         """
 144         self.DCNetwork_graph.add_node(label)
 145         return Dockernet.addDocker(self, label, cls=EmulatorCompute, **params)
 146
 147     def removeDocker( self, label, **params ):
 148         """
 149         Wrapper for removeDocker method to update graph.
 150         """
 151         self.DCNetwork_graph.remove_node(label)
 152         return Dockernet.removeDocker(self, label, **params)
 153
 154     def addSwitch( self, name, add_to_graph=True, **params ):
 155         """
 156         Wrapper for addSwitch method to store switch also in graph.
 157         """
 158         if add_to_graph:
 159             self.DCNetwork_graph.add_node(name)
 160         return Dockernet.addSwitch(self, name, protocols='OpenFlow10,OpenFlow12,OpenFlow13', **params)
 161
 162     def getAllContainers(self):
 163         """
 164         Returns a list with all containers within all data centers.
 165         """
 166         all_containers = []
 167         for dc in self.dcs.itervalues():
 168             all_containers += dc.listCompute()
 169         return all_containers
 170
 171     def start(self):
 172         # start
 173         for dc in self.dcs.itervalues():
 174             dc.start()
 175         Dockernet.start(self)
 176
 177     def stop(self):
 178         # stop Ryu controller
 179         Dockernet.stop(self)
 180         self.stopRyu()
 181         # stop the monitor agent
 182         self.monitor_agent.stop()
 183
 184     def CLI(self):
 185         CLI(self)
 186
 187     # to remove chain do setChain( src, dst, cmd='del-flows')
 188     def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, cmd='add-flow'):
 189
 190         #check if port is specified (vnf:port)
 191         if vnf_src_interface is None:
 192             # take first interface by default
 193             connected_sw = self.DCNetwork_graph.neighbors(vnf_src_name)[0]
 194             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 195             vnf_src_interface = link_dict[0]['src_port_id']
 196             #vnf_source_interface = 0
 197
 198         for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name):
 199             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 200             for link in link_dict:
 201                 #logging.info("{0},{1}".format(link_dict[link],vnf_source_interface))
 202                 if link_dict[link]['src_port_id'] == vnf_src_interface:
 203                     # found the right link and connected switch
 204                     #logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface))
 205                     src_sw = connected_sw
 206
 207                     src_sw_inport = link_dict[link]['dst_port']
 208                     break
 209
 210         if vnf_dst_interface is None:
 211             # take first interface by default
 212             connected_sw = self.DCNetwork_graph.neighbors(vnf_dst_name)[0]
 213             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 214             vnf_dst_interface = link_dict[0]['dst_port_id']
 215             #vnf_dest_interface = 0
 216
 217         vnf_dst_name = vnf_dst_name.split(':')[0]
 218         for connected_sw in self.DCNetwork_graph.neighbors(vnf_dst_name):
 219             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 220             for link in link_dict:
 221                 if link_dict[link]['dst_port_id'] == vnf_dst_interface:
 222                     # found the right link and connected switch
 223                     dst_sw = connected_sw
 224                     dst_sw_outport = link_dict[link]['src_port']
 225                     break
 226
 227
 228         # get shortest path
 229         #path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
 230         try:
 231             path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw)
 232         except:
 233             logging.info("No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name))
 234             return "No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 235
 236         logging.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path))
 237
 238         #current_hop = vnf_src_name
 239         current_hop = src_sw
 240         switch_inport = src_sw_inport
 241
 242         for i in range(0,len(path)):
 243             current_node = self.getNodeByName(current_hop)
 244             if path.index(current_hop) < len(path)-1:
 245                 next_hop = path[path.index(current_hop)+1]
 246             else:
 247                 #last switch reached
 248                 next_hop = vnf_dst_name
 249
 250             next_node = self.getNodeByName(next_hop)
 251
 252             if next_hop == vnf_dst_name:
 253                 switch_outport = dst_sw_outport
 254                 logging.info("end node reached: {0}".format(vnf_dst_name))
 255             elif not isinstance( next_node, OVSSwitch ):
 256                 logging.info("Next node: {0} is not a switch".format(next_hop))
 257                 return "Next node: {0} is not a switch".format(next_hop)
 258             else:
 259                 # take first link between switches by default
 260                 index_edge_out = 0
 261                 switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 262
 263             # take into account that multiple edges are possible between 2 nodes
 264             index_edge_in = 0
 265
 266
 267             #switch_inport = self.DCNetwork_graph[current_hop][next_hop][index_edge_in]['dst_port']
 268
 269             #next2_hop = path[path.index(current_hop)+2]
 270             #index_edge_out = 0
 271             #switch_outport = self.DCNetwork_graph[next_hop][next2_hop][index_edge_out]['src_port']
 272             #switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 273
 274             #logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport, switch_outport))
 275             # set of entry via ovs-ofctl
 276             # TODO use rest API of ryu to set flow entries to correct witch dpid
 277             if isinstance( current_node, OVSSwitch ):
 278                 match = 'in_port=%s' % switch_inport
 279
 280                 if cmd=='add-flow':
 281                     action = 'action=%s' % switch_outport
 282                     s = ','
 283                     ofcmd = s.join([match,action])
 284                 elif cmd=='del-flows':
 285                     ofcmd = match
 286                 else:
 287                     ofcmd=''
 288
 289                 current_node.dpctl(cmd, ofcmd)
 290                 logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport,
 291                                                                                      switch_outport))
 292             # take first link between switches by default
 293             if isinstance( next_node, OVSSwitch ):
 294                 switch_inport = self.DCNetwork_graph[current_hop][next_hop][0]['dst_port']
 295                 current_hop = next_hop
 296
 297         return "path added between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 298         #return "destination node: {0} not reached".format(vnf_dst_name)
 299
 300     # start Ryu Openflow controller as Remote Controller for the DCNetwork
 301     def startRyu(self):
 302         # start Ryu controller with rest-API
 303         python_install_path = site.getsitepackages()[0]
 304         ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
 305         ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py'
 306         # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
 307         # Ryu still uses 6633 as default
 308         ryu_option = '--ofp-tcp-listen-port'
 309         ryu_of_port = '6653'
 310         ryu_cmd = 'ryu-manager'
 311         FNULL = open("/tmp/ryu.log", 'w')
 312         self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 313         # no learning switch
 314         #self.ryu_process = Popen([ryu_cmd, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 315         time.sleep(1)
 316
 317     def stopRyu(self):
 318         if self.ryu_process is not None:
 319             self.ryu_process.terminate()
 320             self.ryu_process.kill()
 321