src/nepi/testbeds/ns3/execute.py

   1 #!/usr/bin/env python
   2 # -*- coding: utf-8 -*-
   3
   4 from nepi.core import testbed_impl
   5 from nepi.core.attributes import Attribute
   6 from constants import TESTBED_ID
   7 from nepi.util.constants import TIME_NOW, \
   8     TESTBED_STATUS_STARTED
   9 import os
  10 import sys
  11 import threading
  12 import random
  13 import socket
  14 import weakref
  15
  16 class TestbedController(testbed_impl.TestbedController):
  17     from nepi.util.tunchannel_impl import TunChannel
  18
  19     LOCAL_FACTORIES = {
  20         'ns3::Nepi::TunChannel' : TunChannel,
  21     }
  22
  23     LOCAL_TYPES = tuple(LOCAL_FACTORIES.values())
  24
  25     def __init__(self, testbed_version):
  26         super(TestbedController, self).__init__(TESTBED_ID, testbed_version)
  27         self._ns3 = None
  28         self._home_directory = None
  29         self._traces = dict()
  30         self._simulator_thread = None
  31         self._condition = None
  32
  33     @property
  34     def home_directory(self):
  35         return self._home_directory
  36
  37     @property
  38     def ns3(self):
  39         return self._ns3
  40
  41     def do_setup(self):
  42         self._home_directory = self._attributes.\
  43             get_attribute_value("homeDirectory")
  44         self._ns3 = self._load_ns3_module()
  45
  46         # create home...
  47         home = os.path.normpath(self.home_directory)
  48         if not os.path.exists(home):
  49             os.makedirs(home, 0755)
  50
  51         super(TestbedController, self).do_setup()
  52
  53     def start(self):
  54         super(TestbedController, self).start()
  55         self._condition = threading.Condition()
  56         self._simulator_thread = threading.Thread(target = self._simulator_run,
  57                 args = [self._condition])
  58         self._simulator_thread.setDaemon(True)
  59         self._simulator_thread.start()
  60
  61     def stop(self, time = TIME_NOW):
  62         super(TestbedController, self).stop(time)
  63         #self.ns3.Simulator.Stop()
  64         self._stop_simulation(time)
  65
  66     def set(self, guid, name, value, time = TIME_NOW):
  67         super(TestbedController, self).set(guid, name, value, time)
  68         # TODO: take on account schedule time for the task
  69         factory_id = self._create[guid]
  70         factory = self._factories[factory_id]
  71         if factory.box_attributes.is_attribute_design_only(name):
  72             return
  73         element = self._elements[guid]
  74         if factory_id in self.LOCAL_FACTORIES:
  75             setattr(element, name, value)
  76         elif factory.box_attributes.is_attribute_invisible(name):
  77             return
  78         else:
  79             ns3_value = self._to_ns3_value(guid, name, value)
  80             self._set_attribute(name, ns3_value, element)
  81
  82     def get(self, guid, name, time = TIME_NOW):
  83         value = super(TestbedController, self).get(guid, name, time)
  84         # TODO: take on account schedule time for the task
  85         factory_id = self._create[guid]
  86         factory = self._factories[factory_id]
  87         element = self._elements[guid]
  88         if factory_id in self.LOCAL_FACTORIES:
  89             if hasattr(element, name):
  90                 return getattr(element, name)
  91             else:
  92                 return value
  93         if factory.box_attributes.is_attribute_design_only(name) or \
  94                 factory.box_attributes.is_attribute_invisible(name):
  95             return value
  96         TypeId = self.ns3.TypeId()
  97         typeid = TypeId.LookupByName(factory_id)
  98         info = TypeId.AttributeInfo()
  99         if not typeid or not typeid.LookupAttributeByName(name, info):
 100             raise AttributeError("Invalid attribute %s for element type %d" % \
 101                 (name, guid))
 102         checker = info.checker
 103         ns3_value = checker.Create()
 104         self._get_attribute(name, ns3_value, element)
 105         value = ns3_value.SerializeToString(checker)
 106         attr_type = factory.box_attributes.get_attribute_type(name)
 107         if attr_type == Attribute.INTEGER:
 108             return int(value)
 109         if attr_type == Attribute.DOUBLE:
 110             return float(value)
 111         if attr_type == Attribute.BOOL:
 112             return value == "true"
 113         return value
 114
 115     def action(self, time, guid, action):
 116         raise NotImplementedError
 117
 118     def trace_filepath(self, guid, trace_id):
 119         filename = self._traces[guid][trace_id]
 120         return os.path.join(self.home_directory, filename)
 121
 122     def follow_trace(self, guid, trace_id, filename):
 123         if not guid in self._traces:
 124             self._traces[guid] = dict()
 125         self._traces[guid][trace_id] = filename
 126
 127     def shutdown(self):
 128         for element in self._elements.itervalues():
 129             if isinstance(element, self.LOCAL_TYPES):
 130                 # graceful shutdown of locally-implemented objects
 131                 element.Cleanup()
 132         self._elements.clear()
 133         if self.ns3:
 134             self.ns3.Simulator.Stop()
 135             #self._stop_simulation("0s")
 136         # TODO!!!! SHOULD WAIT UNTIL THE THREAD FINISHES
 137         #   if self._simulator_thread:
 138         #       self._simulator_thread.join()
 139             self.ns3.Simulator.Destroy()
 140         self._ns3 = None
 141         sys.stdout.flush()
 142         sys.stderr.flush()
 143
 144     def _simulator_run(self, condition):
 145         # Run simulation
 146         self.ns3.Simulator.Run()
 147         # Signal condition on simulation end to notify waiting threads
 148         condition.acquire()
 149         condition.notifyAll()
 150         condition.release()
 151
 152     def _schedule_event(self, condition, func, *args):
 153         """Schedules event on running experiment"""
 154         def execute_event(condition, has_event_occurred, func, *args):
 155             # exec func
 156             try:
 157                 func(*args)
 158             finally:
 159                 # flag event occured
 160                 has_event_occurred[0] = True
 161                 # notify condition indicating attribute was set
 162                 condition.acquire()
 163                 condition.notifyAll()
 164                 condition.release()
 165
 166         # contextId is defined as general context
 167         contextId = long(0xffffffff)
 168         # delay 0 means that the event is expected to execute inmediately
 169         delay = self.ns3.Seconds(0)
 170         # flag to indicate that the event occured
 171         # because bool is an inmutable object in python, in order to create a
 172         # bool flag, a list is used as wrapper
 173         has_event_occurred = [False]
 174         condition.acquire()
 175         if not self.ns3.Simulator.IsFinished():
 176             self.ns3.Simulator.ScheduleWithContext(contextId, delay, execute_event,
 177                  condition, has_event_occurred, func, *args)
 178             while not has_event_occurred[0] and not self.ns3.Simulator.IsFinished():
 179                 condition.wait()
 180                 condition.release()
 181
 182     def _set_attribute(self, name, ns3_value, element):
 183         if self.status() == TESTBED_STATUS_STARTED:
 184             # schedule the event in the Simulator
 185             self._schedule_event(self._condition, self._set_ns3_attribute,
 186                     name, ns3_value, element)
 187         else:
 188             self._set_ns3_attribute(name, ns3_value, element)
 189
 190     def _get_attribute(self, name, ns3_value, element):
 191         if self.status() == TESTBED_STATUS_STARTED:
 192             # schedule the event in the Simulator
 193             self._schedule_event(self._condition, self._get_ns3_attribute,
 194                     name, ns3_value, element)
 195         else:
 196             self._get_ns3_attribute(name, ns3_value, element)
 197
 198     def _set_ns3_attribute(self, name, ns3_value, element):
 199         element.SetAttribute(name, ns3_value)
 200
 201     def _get_ns3_attribute(self, name, ns3_value, element):
 202         element.GetAttribute(name, ns3_value)
 203
 204     def _stop_simulation(self, time):
 205         if self.status() == TESTBED_STATUS_STARTED:
 206             # schedule the event in the Simulator
 207             self._schedule_event(self._condition, self._stop_ns3_simulation,
 208                     time)
 209         else:
 210             self._stop_ns3_simulation(time)
 211
 212     def _stop_simulation(self, time = TIME_NOW):
 213         if not self.ns3:
 214             return
 215         if time == TIME_NOW:
 216             self.ns3.Simulator.Stop()
 217         else:
 218             self.ns3.Simulator.Stop(self.ns3.Time(time))
 219
 220     def _to_ns3_value(self, guid, name, value):
 221         factory_id = self._create[guid]
 222         TypeId = self.ns3.TypeId()
 223         typeid = TypeId.LookupByName(factory_id)
 224         info = TypeId.AttributeInfo()
 225         if not typeid.LookupAttributeByName(name, info):
 226             raise RuntimeError("Attribute %s doesn't belong to element %s" \
 227                    % (name, factory_id))
 228         str_value = str(value)
 229         if isinstance(value, bool):
 230             str_value = str_value.lower()
 231         checker = info.checker
 232         ns3_value = checker.Create()
 233         ns3_value.DeserializeFromString(str_value, checker)
 234         return ns3_value
 235
 236     def _load_ns3_module(self):
 237         import ctypes
 238         import imp
 239
 240         simu_impl_type = self._attributes.get_attribute_value(
 241                 "SimulatorImplementationType")
 242         checksum = self._attributes.get_attribute_value("ChecksumEnabled")
 243         stop_time = self._attributes.get_attribute_value("StopTime")
 244
 245         bindings = os.environ["NEPI_NS3BINDINGS"] \
 246                 if "NEPI_NS3BINDINGS" in os.environ else None
 247         libfile = os.environ["NEPI_NS3LIBRARY"] \
 248                 if "NEPI_NS3LIBRARY" in os.environ else None
 249
 250         if libfile:
 251             ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
 252
 253         path = [ os.path.dirname(__file__) ] + sys.path
 254         if bindings:
 255             path = [ bindings ] + path
 256
 257         try:
 258             module = imp.find_module ('ns3', path)
 259             mod = imp.load_module ('ns3', *module)
 260         except ImportError:
 261             # In some environments, ns3 per-se does not exist,
 262             # only the low-level _ns3
 263             module = imp.find_module ('_ns3', path)
 264             mod = imp.load_module ('_ns3', *module)
 265             sys.modules["ns3"] = mod # install it as ns3 too
 266
 267             # When using _ns3, we have to make sure we destroy
 268             # the simulator when the process finishes
 269             import atexit
 270             atexit.register(mod.Simulator.Destroy)
 271
 272         if simu_impl_type:
 273             value = mod.StringValue(simu_impl_type)
 274             mod.GlobalValue.Bind ("SimulatorImplementationType", value)
 275         if checksum:
 276             value = mod.BooleanValue(checksum)
 277             mod.GlobalValue.Bind ("ChecksumEnabled", value)
 278         if stop_time:
 279             value = mod.Time(stop_time)
 280             mod.Simulator.Stop (value)
 281         return mod
 282
 283     def _get_construct_parameters(self, guid):
 284         params = self._get_parameters(guid)
 285         construct_params = dict()
 286         factory_id = self._create[guid]
 287         TypeId = self.ns3.TypeId()
 288         typeid = TypeId.LookupByName(factory_id)
 289         for name, value in params.iteritems():
 290             info = self.ns3.TypeId.AttributeInfo()
 291             found = typeid.LookupAttributeByName(name, info)
 292             if found and \
 293                 (info.flags & TypeId.ATTR_CONSTRUCT == TypeId.ATTR_CONSTRUCT):
 294                 construct_params[name] = value
 295         return construct_params
 296
 297
 298