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, TESTBED_VERSION
   7 from nepi.util.constants import TIME_NOW, TestbedStatus as TS
   8 import os
   9 import sys
  10 import threading
  11 import random
  12 import socket
  13 import weakref
  14
  15 def load_ns3_module():
  16     import sys
  17     if 'ns3' in sys.modules:
  18         return
  19
  20     import ctypes
  21     import imp
  22     import re
  23
  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
  28
  29     if libdir:
  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]
  33
  34         libscp = list(libs)
  35         while len(libs) > 0:
  36             for lib in libscp:
  37                 libfile = os.path.join(libdir, lib)
  38                 try:
  39                     ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
  40                     libs.remove(lib)
  41                 except:
  42                     pass
  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))
  46             libscp = list(libs)
  47
  48     if bindings:
  49         sys.path.append(bindings)
  50
  51     import ns3_bindings_import as mod
  52     sys.modules["ns3"] = mod
  53
  54 class TestbedController(testbed_impl.TestbedController):
  55     from nepi.util.tunchannel_impl import TunChannel
  56
  57     LOCAL_FACTORIES = {
  58         'ns3::Nepi::TunChannel' : TunChannel,
  59     }
  60
  61     LOCAL_TYPES = tuple(LOCAL_FACTORIES.values())
  62
  63     def __init__(self):
  64         super(TestbedController, self).__init__(TESTBED_ID, TESTBED_VERSION)
  65         self._ns3 = None
  66         self._home_directory = None
  67         self._traces = dict()
  68         self._simulator_thread = None
  69         self._condition = None
  70
  71     @property
  72     def home_directory(self):
  73         return self._home_directory
  74
  75     @property
  76     def ns3(self):
  77         return self._ns3
  78
  79     def do_setup(self):
  80         self._home_directory = self._attributes.\
  81             get_attribute_value("homeDirectory")
  82         self._ns3 = self._configure_ns3_module()
  83
  84         # create home...
  85         home = os.path.normpath(self.home_directory)
  86         if not os.path.exists(home):
  87             os.makedirs(home, 0755)
  88
  89         super(TestbedController, self).do_setup()
  90
  91     def start(self):
  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()
  98
  99     def stop(self, time = TIME_NOW):
 100         super(TestbedController, self).stop(time)
 101         self._stop_simulation(time)
 102
 103     def set(self, guid, name, value, time = TIME_NOW):
 104         super(TestbedController, self).set(guid, name, value, time)
 105         # TODO: take on account schedule time for the task
 106         factory_id = self._create[guid]
 107         factory = self._factories[factory_id]
 108         element = self._elements[guid]
 109         if factory_id in self.LOCAL_FACTORIES:
 110             setattr(element, name, value)
 111         elif not factory.box_attributes.is_attribute_metadata(name):
 112             ns3_value = self._to_ns3_value(guid, name, value)
 113             self._set_attribute(name, ns3_value, element)
 114
 115     def get(self, guid, name, time = TIME_NOW):
 116         value = super(TestbedController, self).get(guid, name, time)
 117         # TODO: take on account schedule time for the task
 118         factory_id = self._create[guid]
 119         factory = self._factories[factory_id]
 120         element = self._elements[guid]
 121         if factory_id in self.LOCAL_FACTORIES:
 122             if hasattr(element, name):
 123                 return getattr(element, name)
 124             else:
 125                 return value
 126         if factory.box_attributes.is_attribute_metadata(name):
 127             return value
 128
 129         TypeId = self.ns3.TypeId()
 130         typeid = TypeId.LookupByName(factory_id)
 131         info = TypeId.AttributeInfo()
 132         if not typeid or not typeid.LookupAttributeByName(name, info):
 133             raise AttributeError("Invalid attribute %s for element type %d" % \
 134                 (name, guid))
 135         checker = info.checker
 136         ns3_value = checker.Create()
 137         self._get_attribute(name, ns3_value, element)
 138         value = ns3_value.SerializeToString(checker)
 139         attr_type = factory.box_attributes.get_attribute_type(name)
 140         if attr_type == Attribute.INTEGER:
 141             return int(value)
 142         if attr_type == Attribute.DOUBLE:
 143             return float(value)
 144         if attr_type == Attribute.BOOL:
 145             return value == "true"
 146         return value
 147
 148     def action(self, time, guid, action):
 149         raise NotImplementedError
 150
 151     def trace_filepath(self, guid, trace_id):
 152         filename = self._traces[guid][trace_id]
 153         return os.path.join(self.home_directory, filename)
 154
 155     def follow_trace(self, guid, trace_id, filename):
 156         if not guid in self._traces:
 157             self._traces[guid] = dict()
 158         self._traces[guid][trace_id] = filename
 159
 160     def shutdown(self):
 161         for element in self._elements.itervalues():
 162             if isinstance(element, self.LOCAL_TYPES):
 163                 # graceful shutdown of locally-implemented objects
 164                 element.Cleanup()
 165         if self.ns3:
 166             if not self.ns3.Simulator.IsFinished():
 167                 self.stop()
 168
 169             # TODO!!!! SHOULD WAIT UNTIL THE THREAD FINISHES
 170             if self._simulator_thread:
 171                 self._simulator_thread.join()
 172
 173             self.ns3.Simulator.Destroy()
 174
 175         self._elements.clear()
 176
 177         self._ns3 = None
 178         sys.stdout.flush()
 179         sys.stderr.flush()
 180
 181     def _simulator_run(self, condition):
 182         # Run simulation
 183         self.ns3.Simulator.Run()
 184         # Signal condition on simulation end to notify waiting threads
 185         condition.acquire()
 186         condition.notifyAll()
 187         condition.release()
 188
 189     def _schedule_event(self, condition, func, *args):
 190         """Schedules event on running experiment"""
 191         def execute_event(condition, has_event_occurred, func, *args):
 192             # exec func
 193             try:
 194                 func(*args)
 195             finally:
 196                 # flag event occured
 197                 has_event_occurred[0] = True
 198                 # notify condition indicating attribute was set
 199                 condition.acquire()
 200                 condition.notifyAll()
 201                 condition.release()
 202
 203         # contextId is defined as general context
 204         contextId = long(0xffffffff)
 205         # delay 0 means that the event is expected to execute inmediately
 206         delay = self.ns3.Seconds(0)
 207         # flag to indicate that the event occured
 208         # because bool is an inmutable object in python, in order to create a
 209         # bool flag, a list is used as wrapper
 210         has_event_occurred = [False]
 211         condition.acquire()
 212         try:
 213             if not self.ns3.Simulator.IsFinished():
 214                 self.ns3.Simulator.ScheduleWithContext(contextId, delay, execute_event,
 215                      condition, has_event_occurred, func, *args)
 216                 while not has_event_occurred[0] and not self.ns3.Simulator.IsFinished():
 217                     condition.wait()
 218         finally:
 219             condition.release()
 220
 221     def _set_attribute(self, name, ns3_value, element):
 222         if self.status() == TS.STATUS_STARTED:
 223             # schedule the event in the Simulator
 224             self._schedule_event(self._condition, self._set_ns3_attribute,
 225                     name, ns3_value, element)
 226         else:
 227             self._set_ns3_attribute(name, ns3_value, element)
 228
 229     def _get_attribute(self, name, ns3_value, element):
 230         if self.status() == TS.STATUS_STARTED:
 231             # schedule the event in the Simulator
 232             self._schedule_event(self._condition, self._get_ns3_attribute,
 233                     name, ns3_value, element)
 234         else:
 235             self._get_ns3_attribute(name, ns3_value, element)
 236
 237     def _set_ns3_attribute(self, name, ns3_value, element):
 238         element.SetAttribute(name, ns3_value)
 239
 240     def _get_ns3_attribute(self, name, ns3_value, element):
 241         element.GetAttribute(name, ns3_value)
 242
 243     def _stop_simulation(self, time):
 244         if self.status() == TS.STATUS_STARTED:
 245             # schedule the event in the Simulator
 246             self._schedule_event(self._condition, self._stop_ns3_simulation,
 247                     time)
 248         else:
 249             self._stop_ns3_simulation(time)
 250
 251     def _stop_ns3_simulation(self, time = TIME_NOW):
 252         if not self.ns3:
 253             return
 254         if time == TIME_NOW:
 255             self.ns3.Simulator.Stop()
 256         else:
 257             self.ns3.Simulator.Stop(self.ns3.Time(time))
 258
 259     def _to_ns3_value(self, guid, name, value):
 260         factory_id = self._create[guid]
 261         TypeId = self.ns3.TypeId()
 262         typeid = TypeId.LookupByName(factory_id)
 263         info = TypeId.AttributeInfo()
 264         if not typeid.LookupAttributeByName(name, info):
 265             raise RuntimeError("Attribute %s doesn't belong to element %s" \
 266                    % (name, factory_id))
 267         str_value = str(value)
 268         if isinstance(value, bool):
 269             str_value = str_value.lower()
 270         checker = info.checker
 271         ns3_value = checker.Create()
 272         ns3_value.DeserializeFromString(str_value, checker)
 273         return ns3_value
 274
 275     def _configure_ns3_module(self):
 276         simu_impl_type = self._attributes.get_attribute_value(
 277                 "SimulatorImplementationType")
 278         sched_impl_type = self._attributes.get_attribute_value(
 279                 "SchedulerType")
 280         checksum = self._attributes.get_attribute_value("ChecksumEnabled")
 281         stop_time = self._attributes.get_attribute_value("StopTime")
 282
 283         load_ns3_module()
 284
 285         import ns3 as mod
 286
 287         if simu_impl_type:
 288             value = mod.StringValue(simu_impl_type)
 289             mod.GlobalValue.Bind ("SimulatorImplementationType", value)
 290         if sched_impl_type:
 291             value = mod.StringValue(sched_impl_type)
 292             mod.GlobalValue.Bind ("SchedulerType", value)
 293         if checksum:
 294             value = mod.BooleanValue(checksum)
 295             mod.GlobalValue.Bind ("ChecksumEnabled", value)
 296         if stop_time:
 297             value = mod.Time(stop_time)
 298             mod.Simulator.Stop (value)
 299         return mod
 300
 301     def _get_construct_parameters(self, guid):
 302         params = self._get_parameters(guid)
 303         construct_params = dict()
 304         factory_id = self._create[guid]
 305         TypeId = self.ns3.TypeId()
 306         typeid = TypeId.LookupByName(factory_id)
 307         for name, value in params.iteritems():
 308             info = self.ns3.TypeId.AttributeInfo()
 309             found = typeid.LookupAttributeByName(name, info)
 310             if found and \
 311                 (info.flags & TypeId.ATTR_CONSTRUCT == TypeId.ATTR_CONSTRUCT):
 312                 construct_params[name] = value
 313         return construct_params
 314
 315
 316