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
 182     def CLI(self):
 183         CLI(self)
 184
 185     # to remove chain do setChain( src, dst, cmd='del-flows')
 186     def setChain(self, vnf_src_name, vnf_dst_name, vnf_src_interface=None, vnf_dst_interface=None, cmd='add-flow'):
 187
 188         #check if port is specified (vnf:port)
 189         if vnf_src_interface is None:
 190             # take first interface by default
 191             connected_sw = self.DCNetwork_graph.neighbors(vnf_src_name)[0]
 192             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 193             vnf_src_interface = link_dict[0]['src_port_id']
 194             #vnf_source_interface = 0
 195
 196         for connected_sw in self.DCNetwork_graph.neighbors(vnf_src_name):
 197             link_dict = self.DCNetwork_graph[vnf_src_name][connected_sw]
 198             for link in link_dict:
 199                 #logging.info("{0},{1}".format(link_dict[link],vnf_source_interface))
 200                 if link_dict[link]['src_port_id'] == vnf_src_interface:
 201                     # found the right link and connected switch
 202                     #logging.info("{0},{1}".format(link_dict[link]['src_port_id'], vnf_source_interface))
 203                     src_sw = connected_sw
 204
 205                     src_sw_inport = link_dict[link]['dst_port']
 206                     break
 207
 208         if vnf_dst_interface is None:
 209             # take first interface by default
 210             connected_sw = self.DCNetwork_graph.neighbors(vnf_dst_name)[0]
 211             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 212             vnf_dst_interface = link_dict[0]['dst_port_id']
 213             #vnf_dest_interface = 0
 214
 215         vnf_dst_name = vnf_dst_name.split(':')[0]
 216         for connected_sw in self.DCNetwork_graph.neighbors(vnf_dst_name):
 217             link_dict = self.DCNetwork_graph[connected_sw][vnf_dst_name]
 218             for link in link_dict:
 219                 if link_dict[link]['dst_port_id'] == vnf_dst_interface:
 220                     # found the right link and connected switch
 221                     dst_sw = connected_sw
 222                     dst_sw_outport = link_dict[link]['src_port']
 223                     break
 224
 225
 226         # get shortest path
 227         #path = nx.shortest_path(self.DCNetwork_graph, vnf_src_name, vnf_dst_name)
 228         try:
 229             path = nx.shortest_path(self.DCNetwork_graph, src_sw, dst_sw)
 230         except:
 231             logging.info("No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name))
 232             return "No path could be found between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 233
 234         logging.info("Path between {0} and {1}: {2}".format(vnf_src_name, vnf_dst_name, path))
 235
 236         #current_hop = vnf_src_name
 237         current_hop = src_sw
 238         switch_inport = src_sw_inport
 239
 240         for i in range(0,len(path)):
 241             current_node = self.getNodeByName(current_hop)
 242             if path.index(current_hop) < len(path)-1:
 243                 next_hop = path[path.index(current_hop)+1]
 244             else:
 245                 #last switch reached
 246                 next_hop = vnf_dst_name
 247
 248             next_node = self.getNodeByName(next_hop)
 249
 250             if next_hop == vnf_dst_name:
 251                 switch_outport = dst_sw_outport
 252                 logging.info("end node reached: {0}".format(vnf_dst_name))
 253             elif not isinstance( next_node, OVSSwitch ):
 254                 logging.info("Next node: {0} is not a switch".format(next_hop))
 255                 return "Next node: {0} is not a switch".format(next_hop)
 256             else:
 257                 # take first link between switches by default
 258                 index_edge_out = 0
 259                 switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 260
 261             # take into account that multiple edges are possible between 2 nodes
 262             index_edge_in = 0
 263
 264
 265             #switch_inport = self.DCNetwork_graph[current_hop][next_hop][index_edge_in]['dst_port']
 266
 267             #next2_hop = path[path.index(current_hop)+2]
 268             #index_edge_out = 0
 269             #switch_outport = self.DCNetwork_graph[next_hop][next2_hop][index_edge_out]['src_port']
 270             #switch_outport = self.DCNetwork_graph[current_hop][next_hop][index_edge_out]['src_port']
 271
 272             #logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport, switch_outport))
 273             # set of entry via ovs-ofctl
 274             # TODO use rest API of ryu to set flow entries to correct witch dpid
 275             if isinstance( current_node, OVSSwitch ):
 276                 match = 'in_port=%s' % switch_inport
 277
 278                 if cmd=='add-flow':
 279                     action = 'action=%s' % switch_outport
 280                     s = ','
 281                     ofcmd = s.join([match,action])
 282                 elif cmd=='del-flows':
 283                     ofcmd = match
 284                 else:
 285                     ofcmd=''
 286
 287                 current_node.dpctl(cmd, ofcmd)
 288                 logging.info("add flow in switch: {0} in_port: {1} out_port: {2}".format(current_node.name, switch_inport,
 289                                                                                      switch_outport))
 290             # take first link between switches by default
 291             if isinstance( next_node, OVSSwitch ):
 292                 switch_inport = self.DCNetwork_graph[current_hop][next_hop][0]['dst_port']
 293                 current_hop = next_hop
 294
 295         return "path added between {0} and {1}".format(vnf_src_name, vnf_dst_name)
 296         #return "destination node: {0} not reached".format(vnf_dst_name)
 297
 298     # start Ryu Openflow controller as Remote Controller for the DCNetwork
 299     def startRyu(self):
 300         # start Ryu controller with rest-API
 301         python_install_path = site.getsitepackages()[0]
 302         ryu_path = python_install_path + '/ryu/app/simple_switch_13.py'
 303         ryu_path2 = python_install_path + '/ryu/app/ofctl_rest.py'
 304         # change the default Openflow controller port to 6653 (official IANA-assigned port number), as used by Mininet
 305         # Ryu still uses 6633 as default
 306         ryu_option = '--ofp-tcp-listen-port'
 307         ryu_of_port = '6653'
 308         ryu_cmd = 'ryu-manager'
 309         FNULL = open("/tmp/ryu.log", 'w')
 310         self.ryu_process = Popen([ryu_cmd, ryu_path, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 311         # no learning switch
 312         #self.ryu_process = Popen([ryu_cmd, ryu_path2, ryu_option, ryu_of_port], stdout=FNULL, stderr=FNULL)
 313         time.sleep(1)
 314
 315     def stopRyu(self):
 316         if self.ryu_process is not None:
 317             self.ryu_process.terminate()
 318             self.ryu_process.kill()
 319