2 # -*- coding: utf-8 -*-
4 from nepi.core import testbed_impl
5 from nepi.core.attributes import Attribute
6 from constants import TESTBED_ID, TESTBED_VERSION
7 from nepi.util.constants import TIME_NOW, TestbedStatus as TS
15 def load_ns3_module():
17 if 'ns3' in sys.modules:
24 bindings = os.environ["NEPI_NS3BINDINGS"] \
25 if "NEPI_NS3BINDINGS" in os.environ else None
26 libdir = os.environ["NEPI_NS3LIBRARY"] \
27 if "NEPI_NS3LIBRARY" in os.environ else None
30 files = os.listdir(libdir)
31 regex = re.compile("(.*\.so)$")
32 libs = [m.group(1) for filename in files for m in [regex.search(filename)] if m]
37 libfile = os.path.join(libdir, lib)
39 ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
43 # if did not load any libraries in the last iteration
44 if len(libscp) == len(libs):
45 raise RuntimeError("Imposible to load shared libraries %s" % str(libs))
49 sys.path.append(bindings)
51 import ns3_bindings_import as mod
52 sys.modules["ns3"] = mod
54 class TestbedController(testbed_impl.TestbedController):
55 from nepi.util.tunchannel_impl import TunChannel
58 'ns3::Nepi::TunChannel' : TunChannel,
61 LOCAL_TYPES = tuple(LOCAL_FACTORIES.values())
64 super(TestbedController, self).__init__(TESTBED_ID, TESTBED_VERSION)
66 self._home_directory = None
68 self._simulator_thread = None
69 self._condition = None
72 def home_directory(self):
73 return self._home_directory
80 self._home_directory = self._attributes.\
81 get_attribute_value("homeDirectory")
82 self._ns3 = self._configure_ns3_module()
85 home = os.path.normpath(self.home_directory)
86 if not os.path.exists(home):
87 os.makedirs(home, 0755)
89 super(TestbedController, self).do_setup()
92 super(TestbedController, self).start()
93 self._condition = threading.Condition()
94 self._simulator_thread = threading.Thread(target = self._simulator_run,
95 args = [self._condition])
96 self._simulator_thread.setDaemon(True)
97 self._simulator_thread.start()
99 def stop(self, time = TIME_NOW):
100 super(TestbedController, self).stop(time)
101 #self.ns3.Simulator.Stop()
102 self._stop_simulation(time)
104 def set(self, guid, name, value, time = TIME_NOW):
105 super(TestbedController, self).set(guid, name, value, time)
106 # TODO: take on account schedule time for the task
107 factory_id = self._create[guid]
108 factory = self._factories[factory_id]
109 element = self._elements[guid]
110 if factory_id in self.LOCAL_FACTORIES:
111 setattr(element, name, value)
112 elif not factory.box_attributes.is_attribute_metadata(name):
113 ns3_value = self._to_ns3_value(guid, name, value)
114 self._set_attribute(name, ns3_value, element)
116 def get(self, guid, name, time = TIME_NOW):
117 value = super(TestbedController, self).get(guid, name, time)
118 # TODO: take on account schedule time for the task
119 factory_id = self._create[guid]
120 factory = self._factories[factory_id]
121 element = self._elements[guid]
122 if factory_id in self.LOCAL_FACTORIES:
123 if hasattr(element, name):
124 return getattr(element, name)
127 if factory.box_attributes.is_attribute_metadata(name):
130 TypeId = self.ns3.TypeId()
131 typeid = TypeId.LookupByName(factory_id)
132 info = TypeId.AttributeInfo()
133 if not typeid or not typeid.LookupAttributeByName(name, info):
134 raise AttributeError("Invalid attribute %s for element type %d" % \
136 checker = info.checker
137 ns3_value = checker.Create()
138 self._get_attribute(name, ns3_value, element)
139 value = ns3_value.SerializeToString(checker)
140 attr_type = factory.box_attributes.get_attribute_type(name)
141 if attr_type == Attribute.INTEGER:
143 if attr_type == Attribute.DOUBLE:
145 if attr_type == Attribute.BOOL:
146 return value == "true"
149 def action(self, time, guid, action):
150 raise NotImplementedError
152 def trace_filepath(self, guid, trace_id):
153 filename = self._traces[guid][trace_id]
154 return os.path.join(self.home_directory, filename)
156 def follow_trace(self, guid, trace_id, filename):
157 if not guid in self._traces:
158 self._traces[guid] = dict()
159 self._traces[guid][trace_id] = filename
162 for element in self._elements.itervalues():
163 if isinstance(element, self.LOCAL_TYPES):
164 # graceful shutdown of locally-implemented objects
167 self.ns3.Simulator.Stop()
169 # Wait for it to stop, with a 30s timeout
170 for i in xrange(300):
171 if self.ns3.Simulator.IsFinished():
174 #self._stop_simulation("0s")
176 self._elements.clear()
179 # TODO!!!! SHOULD WAIT UNTIL THE THREAD FINISHES
180 # if self._simulator_thread:
181 # self._simulator_thread.join()
182 self.ns3.Simulator.Destroy()
188 def _simulator_run(self, condition):
190 self.ns3.Simulator.Run()
191 # Signal condition on simulation end to notify waiting threads
193 condition.notifyAll()
196 def _schedule_event(self, condition, func, *args):
197 """Schedules event on running experiment"""
198 def execute_event(condition, has_event_occurred, func, *args):
204 has_event_occurred[0] = True
205 # notify condition indicating attribute was set
207 condition.notifyAll()
210 # contextId is defined as general context
211 contextId = long(0xffffffff)
212 # delay 0 means that the event is expected to execute inmediately
213 delay = self.ns3.Seconds(0)
214 # flag to indicate that the event occured
215 # because bool is an inmutable object in python, in order to create a
216 # bool flag, a list is used as wrapper
217 has_event_occurred = [False]
219 if not self.ns3.Simulator.IsFinished():
220 self.ns3.Simulator.ScheduleWithContext(contextId, delay, execute_event,
221 condition, has_event_occurred, func, *args)
222 while not has_event_occurred[0] and not self.ns3.Simulator.IsFinished():
226 def _set_attribute(self, name, ns3_value, element):
227 if self.status() == TS.STATUS_STARTED:
228 # schedule the event in the Simulator
229 self._schedule_event(self._condition, self._set_ns3_attribute,
230 name, ns3_value, element)
232 self._set_ns3_attribute(name, ns3_value, element)
234 def _get_attribute(self, name, ns3_value, element):
235 if self.status() == TS.STATUS_STARTED:
236 # schedule the event in the Simulator
237 self._schedule_event(self._condition, self._get_ns3_attribute,
238 name, ns3_value, element)
240 self._get_ns3_attribute(name, ns3_value, element)
242 def _set_ns3_attribute(self, name, ns3_value, element):
243 element.SetAttribute(name, ns3_value)
245 def _get_ns3_attribute(self, name, ns3_value, element):
246 element.GetAttribute(name, ns3_value)
248 def _stop_simulation(self, time):
249 if self.status() == TS.STATUS_STARTED:
250 # schedule the event in the Simulator
251 self._schedule_event(self._condition, self._stop_ns3_simulation,
254 self._stop_ns3_simulation(time)
256 def _stop_ns3_simulation(self, time = TIME_NOW):
260 self.ns3.Simulator.Stop()
262 self.ns3.Simulator.Stop(self.ns3.Time(time))
264 def _to_ns3_value(self, guid, name, value):
265 factory_id = self._create[guid]
266 TypeId = self.ns3.TypeId()
267 typeid = TypeId.LookupByName(factory_id)
268 info = TypeId.AttributeInfo()
269 if not typeid.LookupAttributeByName(name, info):
270 raise RuntimeError("Attribute %s doesn't belong to element %s" \
271 % (name, factory_id))
272 str_value = str(value)
273 if isinstance(value, bool):
274 str_value = str_value.lower()
275 checker = info.checker
276 ns3_value = checker.Create()
277 ns3_value.DeserializeFromString(str_value, checker)
280 def _configure_ns3_module(self):
281 simu_impl_type = self._attributes.get_attribute_value(
282 "SimulatorImplementationType")
283 sched_impl_type = self._attributes.get_attribute_value(
285 checksum = self._attributes.get_attribute_value("ChecksumEnabled")
286 stop_time = self._attributes.get_attribute_value("StopTime")
293 value = mod.StringValue(simu_impl_type)
294 mod.GlobalValue.Bind ("SimulatorImplementationType", value)
296 value = mod.StringValue(sched_impl_type)
297 mod.GlobalValue.Bind ("SchedulerType", value)
299 value = mod.BooleanValue(checksum)
300 mod.GlobalValue.Bind ("ChecksumEnabled", value)
302 value = mod.Time(stop_time)
303 mod.Simulator.Stop (value)
306 def _get_construct_parameters(self, guid):
307 params = self._get_parameters(guid)
308 construct_params = dict()
309 factory_id = self._create[guid]
310 TypeId = self.ns3.TypeId()
311 typeid = TypeId.LookupByName(factory_id)
312 for name, value in params.iteritems():
313 info = self.ns3.TypeId.AttributeInfo()
314 found = typeid.LookupAttributeByName(name, info)
316 (info.flags & TypeId.ATTR_CONSTRUCT == TypeId.ATTR_CONSTRUCT):
317 construct_params[name] = value
318 return construct_params