2 # NEPI, a framework to manage network experiments
3 # Copyright (C) 2013 INRIA
5 # This program is free software: you can redistribute it and/or modify
6 # it under the terms of the GNU General Public License as published by
7 # the Free Software Foundation, either version 3 of the License, or
8 # (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program. If not, see <http://www.gnu.org/licenses/>.
18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
27 SINGLETON = "singleton::"
28 SIMULATOR_UUID = "singleton::Simulator"
29 CONFIG_UUID = "singleton::Config"
30 GLOBAL_VALUE_UUID = "singleton::GlobalValue"
31 IPV4_GLOBAL_ROUTING_HELPER_UUID = "singleton::Ipv4GlobalRoutingHelper"
33 def load_ns3_libraries():
37 libdir = os.environ.get("NS3LIBRARIES")
39 # Load the ns-3 modules shared libraries
41 files = os.listdir(libdir)
42 regex = re.compile("(.*\.so)$")
43 libs = [m.group(1) for filename in files for m in [regex.search(filename)] if m]
45 initial_size = len(libs)
46 # Try to load the libraries in the right order by trial and error.
47 # Loop until all libraries are loaded.
50 libfile = os.path.join(libdir, lib)
52 ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
56 #err = traceback.format_exc()
60 # if did not load any libraries in the last iteration break
61 # to prevent infinit loop
62 if initial_size == len(libs):
63 raise RuntimeError("Imposible to load shared libraries %s" % str(libs))
64 initial_size = len(libs)
66 def load_ns3_module():
69 # import the python bindings for the ns-3 modules
70 bindings = os.environ.get("NS3BINDINGS")
72 sys.path.append(bindings)
78 # create a Python module to add all ns3 classes
79 ns3mod = imp.new_module("ns3")
80 sys.modules["ns3"] = ns3mod
82 for importer, modname, ispkg in pkgutil.iter_modules(ns.__path__):
83 if modname in [ "visualizer" ]:
86 fullmodname = "ns.%s" % modname
87 module = __import__(fullmodname, globals(), locals(), ['*'])
89 for sattr in dir(module):
90 if sattr.startswith("_"):
93 attr = getattr(module, sattr)
95 # netanim.Config and lte.Config singleton overrides ns3::Config
96 if sattr == "Config" and modname in ['netanim', 'lte']:
97 sattr = "%s.%s" % (modname, sattr)
99 setattr(ns3mod, sattr, attr)
103 class NS3Wrapper(object):
104 def __init__(self, loglevel = logging.INFO, enable_dump = False):
105 super(NS3Wrapper, self).__init__()
106 # Thread used to run the simulation
107 self._simulation_thread = None
108 self._condition = None
110 # True if Simulator::Run was invoked
111 self._started = False
113 # holds reference to all C++ objects and variables in the simulation
114 self._objects = dict()
117 self._logger = logging.getLogger("ns3wrapper")
118 self._logger.setLevel(loglevel)
120 ## NOTE that the reason to create a handler to the ns3 module,
121 # that is re-loaded each time a ns-3 wrapper is instantiated,
122 # is that else each unit test for the ns3wrapper class would need
123 # a separate file. Several ns3wrappers would be created in the
124 # same unit test (single process), leading to inchorences in the
125 # state of ns-3 global objects
127 # Handler to ns3 classes
130 # Collection of allowed ns3 classes
131 self._allowed_types = None
133 # Object to dump instructions to reproduce and debug experiment
134 from ns3wrapper_debug import NS3WrapperDebuger
135 self._debuger = NS3WrapperDebuger(enabled = enable_dump)
144 # load ns-3 libraries and bindings
145 self._ns3 = load_ns3_module()
150 def allowed_types(self):
151 if not self._allowed_types:
152 self._allowed_types = set()
153 type_id = self.ns3.TypeId()
155 tid_count = type_id.GetRegisteredN()
156 base = type_id.LookupByName("ns3::Object")
158 for i in xrange(tid_count):
159 tid = type_id.GetRegistered(i)
161 if tid.MustHideFromDocumentation() or \
162 not tid.HasConstructor() or \
163 not tid.IsChildOf(base):
166 type_name = tid.GetName()
167 self._allowed_types.add(type_name)
169 return self._allowed_types
176 def is_running(self):
177 return self._started and not self.ns3.Simulator.IsFinished()
180 def is_finished(self):
181 return self.ns3.Simulator.IsFinished()
184 return "uuid%s" % uuid.uuid4()
186 def get_object(self, uuid):
187 return self._objects.get(uuid)
189 def factory(self, type_name, **kwargs):
190 """ This method should be used to construct ns-3 objects
191 that have a TypeId and related introspection information """
193 if type_name not in self.allowed_types:
194 msg = "Type %s not supported" % (type_name)
195 self.logger.error(msg)
197 uuid = self.make_uuid()
200 self.logger.debug("FACTORY %s( %s )" % (type_name, str(kwargs)))
202 self.debuger.dump_factory(uuid, type_name, kwargs)
205 factory = self.ns3.ObjectFactory()
206 factory.SetTypeId(type_name)
208 for name, value in kwargs.iteritems():
209 ns3_value = self._attr_from_string_to_ns3_value(type_name, name, value)
210 factory.Set(name, ns3_value)
212 obj = factory.Create()
214 self._objects[uuid] = obj
217 self.logger.debug("RET FACTORY ( uuid %s ) %s = %s( %s )" % (
218 str(uuid), str(obj), type_name, str(kwargs)))
223 def create(self, clazzname, *args):
224 """ This method should be used to construct ns-3 objects that
225 do not have a TypeId (e.g. Values) """
227 if not hasattr(self.ns3, clazzname):
228 msg = "Type %s not supported" % (clazzname)
229 self.logger.error(msg)
231 uuid = self.make_uuid()
234 self.logger.debug("CREATE %s( %s )" % (clazzname, str(args)))
236 self.debuger.dump_create(uuid, clazzname, args)
239 clazz = getattr(self.ns3, clazzname)
241 # arguments starting with 'uuid' identify ns-3 C++
242 # objects and must be replaced by the actual object
243 realargs = self.replace_args(args)
245 obj = clazz(*realargs)
247 self._objects[uuid] = obj
250 self.logger.debug("RET CREATE ( uuid %s ) %s = %s( %s )" % (str(uuid),
251 str(obj), clazzname, str(args)))
256 def invoke(self, uuid, operation, *args, **kwargs):
258 self.logger.debug("INVOKE %s -> %s( %s, %s ) " % (
259 uuid, operation, str(args), str(kwargs)))
265 if operation == "isRunning":
266 result = self.is_running
267 elif operation == "isFinished":
268 result = self.is_finished
269 elif operation == "isAppRunning":
270 result = self._is_app_running(uuid)
271 elif operation == "addStaticRoute":
273 self.debuger.dump_add_static_route(uuid, args)
276 result = self._add_static_route(uuid, *args)
278 newuuid = self.make_uuid()
281 self.debuger.dump_invoke(newuuid, uuid, operation, args, kwargs)
284 if uuid.startswith(SINGLETON):
285 obj = self._singleton(uuid)
287 obj = self.get_object(uuid)
289 method = getattr(obj, operation)
291 # arguments starting with 'uuid' identify ns-3 C++
292 # objects and must be replaced by the actual object
293 realargs = self.replace_args(args)
294 realkwargs = self.replace_kwargs(kwargs)
296 result = method(*realargs, **realkwargs)
298 # If the result is an object (not a base value),
299 # then keep track of the object a return the object
300 # reference (newuuid)
301 if not (result is None or type(result) in [
302 bool, float, long, str, int]):
303 self._objects[newuuid] = result
307 self.logger.debug("RET INVOKE %s%s = %s -> %s(%s, %s) " % (
308 "(uuid %s) " % str(newuuid) if newuuid else "", str(result), uuid,
309 operation, str(args), str(kwargs)))
314 def _set_attr(self, obj, name, ns3_value):
315 obj.SetAttribute(name, ns3_value)
317 def set(self, uuid, name, value):
319 self.logger.debug("SET %s %s %s" % (uuid, name, str(value)))
321 self.debuger.dump_set(uuid, name, value)
324 obj = self.get_object(uuid)
325 type_name = obj.GetInstanceTypeId().GetName()
326 ns3_value = self._attr_from_string_to_ns3_value(type_name, name, value)
328 # If the Simulation thread is not running,
329 # then there will be no thread-safety problems
330 # in changing the value of an attribute directly.
331 # However, if the simulation is running we need
332 # to set the value by scheduling an event, else
333 # we risk to corrupt the state of the
336 event_executed = [False]
339 # schedule the event in the Simulator
340 self._schedule_event(self._condition, event_executed,
341 self._set_attr, obj, name, ns3_value)
343 if not event_executed[0]:
344 self._set_attr(obj, name, ns3_value)
347 self.logger.debug("RET SET %s = %s -> set(%s, %s)" % (str(value), uuid, name,
353 def _get_attr(self, obj, name, ns3_value):
354 obj.GetAttribute(name, ns3_value)
356 def get(self, uuid, name):
358 self.logger.debug("GET %s %s" % (uuid, name))
360 self.debuger.dump_get(uuid, name)
363 obj = self.get_object(uuid)
364 type_name = obj.GetInstanceTypeId().GetName()
365 ns3_value = self._create_attr_ns3_value(type_name, name)
367 event_executed = [False]
370 # schedule the event in the Simulator
371 self._schedule_event(self._condition, event_executed,
372 self._get_attr, obj, name, ns3_value)
374 if not event_executed[0]:
375 self._get_attr(obj, name, ns3_value)
377 result = self._attr_from_ns3_value_to_string(type_name, name, ns3_value)
380 self.logger.debug("RET GET %s = %s -> get(%s)" % (str(result), uuid, name))
387 self.debuger.dump_start()
390 # Launch the simulator thread and Start the
391 # simulator in that thread
392 self._condition = threading.Condition()
393 self._simulator_thread = threading.Thread(
394 target = self._simulator_run,
395 args = [self._condition])
396 self._simulator_thread.setDaemon(True)
397 self._simulator_thread.start()
401 self.logger.debug("START")
404 def stop(self, time = None):
406 self.debuger.dump_stop(time=time)
410 self.ns3.Simulator.Stop()
412 self.ns3.Simulator.Stop(self.ns3.Time(time))
415 self.logger.debug("STOP time=%s" % str(time))
420 self.debuger.dump_shutdown()
423 while not self.ns3.Simulator.IsFinished():
424 #self.logger.debug("Waiting for simulation to finish")
427 if self._simulator_thread:
428 self._simulator_thread.join()
430 self.ns3.Simulator.Destroy()
432 # Remove all references to ns-3 objects
433 self._objects.clear()
439 self.logger.debug("SHUTDOWN")
442 def _simulator_run(self, condition):
444 self.ns3.Simulator.Run()
445 # Signal condition to indicate simulation ended and
446 # notify waiting threads
448 condition.notifyAll()
451 def _schedule_event(self, condition, event_executed, func, *args):
452 """ Schedules event on running simulation, and wait until
455 def execute_event(contextId, condition, event_executed, func, *args):
458 event_executed[0] = True
460 # notify condition indicating event was executed
462 condition.notifyAll()
465 # contextId is defined as general context
466 contextId = long(0xffffffff)
468 # delay 0 means that the event is expected to execute inmediately
469 delay = self.ns3.Seconds(0)
471 # Mark event as not executed
472 event_executed[0] = False
476 self.ns3.Simulator.ScheduleWithContext(contextId, delay, execute_event,
477 condition, event_executed, func, *args)
478 if not self.ns3.Simulator.IsFinished():
483 def _create_attr_ns3_value(self, type_name, name):
484 TypeId = self.ns3.TypeId()
485 tid = TypeId.LookupByName(type_name)
486 info = TypeId.AttributeInformation()
487 if not tid.LookupAttributeByName(name, info):
488 msg = "TypeId %s has no attribute %s" % (type_name, name)
489 self.logger.error(msg)
491 checker = info.checker
492 ns3_value = checker.Create()
495 def _attr_from_ns3_value_to_string(self, type_name, name, ns3_value):
496 TypeId = self.ns3.TypeId()
497 tid = TypeId.LookupByName(type_name)
498 info = TypeId.AttributeInformation()
499 if not tid.LookupAttributeByName(name, info):
500 msg = "TypeId %s has no attribute %s" % (type_name, name)
501 self.logger.error(msg)
503 checker = info.checker
504 value = ns3_value.SerializeToString(checker)
506 type_name = checker.GetValueTypeName()
507 if type_name in ["ns3::UintegerValue", "ns3::IntegerValue"]:
509 if type_name == "ns3::DoubleValue":
511 if type_name == "ns3::BooleanValue":
512 return value == "true"
516 def _attr_from_string_to_ns3_value(self, type_name, name, value):
517 TypeId = self.ns3.TypeId()
518 tid = TypeId.LookupByName(type_name)
519 info = TypeId.AttributeInformation()
520 if not tid.LookupAttributeByName(name, info):
521 msg = "TypeId %s has no attribute %s" % (type_name, name)
522 self.logger.error(msg)
524 str_value = str(value)
525 if isinstance(value, bool):
526 str_value = str_value.lower()
528 checker = info.checker
529 ns3_value = checker.Create()
530 ns3_value.DeserializeFromString(str_value, checker)
533 # singletons are identified as "ns3::ClassName"
534 def _singleton(self, ident):
535 if not ident.startswith(SINGLETON):
538 clazzname = ident[ident.find("::")+2:]
539 if not hasattr(self.ns3, clazzname):
540 msg = "Type %s not supported" % (clazzname)
541 self.logger.error(msg)
543 return getattr(self.ns3, clazzname)
545 # replace uuids and singleton references for the real objects
546 def replace_args(self, args):
547 realargs = [self.get_object(arg) if \
548 str(arg).startswith("uuid") else arg for arg in args]
550 realargs = [self._singleton(arg) if \
551 str(arg).startswith(SINGLETON) else arg for arg in realargs]
555 # replace uuids and singleton references for the real objects
556 def replace_kwargs(self, kwargs):
557 realkwargs = dict([(k, self.get_object(v) \
558 if str(v).startswith("uuid") else v) \
559 for k,v in kwargs.iteritems()])
561 realkwargs = dict([(k, self._singleton(v) \
562 if str(v).startswith(SINGLETON) else v )\
563 for k, v in realkwargs.iteritems()])
567 def _is_app_running(self, uuid):
568 now = self.ns3.Simulator.Now()
572 app = self.get_object(uuid)
573 stop_time_value = self.ns3.TimeValue()
574 app.GetAttribute("StopTime", stop_time_value)
575 stop_time = stop_time_value.Get()
577 start_time_value = self.ns3.TimeValue()
578 app.GetAttribute("StartTime", start_time_value)
579 start_time = start_time_value.Get()
581 if now.Compare(start_time) >= 0 and now.Compare(stop_time) < 0:
586 def _add_static_route(self, ipv4_uuid, network, prefix, nexthop):
587 ipv4 = self.get_object(ipv4_uuid)
589 list_routing = ipv4.GetRoutingProtocol()
590 (static_routing, priority) = list_routing.GetRoutingProtocol(0)
592 ifindex = self._find_ifindex(ipv4, nexthop)
596 nexthop = self.ns3.Ipv4Address(nexthop)
598 if network in ["0.0.0.0", "0", None]:
599 # Default route: 0.0.0.0/0
600 static_routing.SetDefaultRoute(nexthop, ifindex)
602 mask = self.ns3.Ipv4Mask("/%s" % prefix)
603 network = self.ns3.Ipv4Address(network)
606 # Host route: x.y.z.w/32
607 static_routing.AddHostRouteTo(network, nexthop, ifindex)
609 # Network route: x.y.z.w/n
610 static_routing.AddNetworkRouteTo(network, mask, nexthop,
614 def _find_ifindex(self, ipv4, nexthop):
617 nexthop = self.ns3.Ipv4Address(nexthop)
619 # For all the interfaces registered with the ipv4 object, find
620 # the one that matches the network of the nexthop
621 nifaces = ipv4.GetNInterfaces()
622 for ifidx in xrange(nifaces):
623 iface = ipv4.GetInterface(ifidx)
624 naddress = iface.GetNAddresses()
625 for addridx in xrange(naddress):
626 ifaddr = iface.GetAddress(addridx)
627 ifmask = ifaddr.GetMask()
629 ifindex = ipv4.GetInterfaceForPrefix(nexthop, ifmask)