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.start()
  59
  60     def set(self, guid, name, value, time = TIME_NOW):
  61         super(TestbedController, self).set(guid, name, value, time)
  62         # TODO: take on account schedule time for the task
  63         factory_id = self._create[guid]
  64         factory = self._factories[factory_id]
  65         if factory.box_attributes.is_attribute_design_only(name):
  66             return
  67         element = self._elements[guid]
  68         if factory_id in self.LOCAL_FACTORIES:
  69             setattr(element, name, value)
  70         elif factory.box_attributes.is_attribute_invisible(name):
  71             return
  72         else:
  73             ns3_value = self._to_ns3_value(guid, name, value)
  74             self._set_attribute(name, ns3_value, element)
  75
  76     def get(self, guid, name, time = TIME_NOW):
  77         value = super(TestbedController, self).get(guid, name, time)
  78         # TODO: take on account schedule time for the task
  79         factory_id = self._create[guid]
  80         factory = self._factories[factory_id]
  81         element = self._elements[guid]
  82         if factory_id in self.LOCAL_FACTORIES:
  83             if hasattr(element, name):
  84                 return getattr(element, name)
  85             else:
  86                 return value
  87         if factory.box_attributes.is_attribute_design_only(name) or \
  88                 factory.box_attributes.is_attribute_invisible(name):
  89             return value
  90         TypeId = self.ns3.TypeId()
  91         typeid = TypeId.LookupByName(factory_id)
  92         info = TypeId.AttributeInfo()
  93         if not typeid or not typeid.LookupAttributeByName(name, info):
  94             raise AttributeError("Invalid attribute %s for element type %d" % \
  95                 (name, guid))
  96         checker = info.checker
  97         ns3_value = checker.Create()
  98         self._get_attribute(name, ns3_value, element)
  99         value = ns3_value.SerializeToString(checker)
 100         attr_type = factory.box_attributes.get_attribute_type(name)
 101         if attr_type == Attribute.INTEGER:
 102             return int(value)
 103         if attr_type == Attribute.DOUBLE:
 104             return float(value)
 105         if attr_type == Attribute.BOOL:
 106             return value == "true"
 107         return value
 108
 109     def action(self, time, guid, action):
 110         raise NotImplementedError
 111
 112     def trace_filename(self, guid, trace_id):
 113         # TODO: Need to be defined inside a home!!!! with and experiment id_code
 114         filename = self._traces[guid][trace_id]
 115         return os.path.join(self.home_directory, filename)
 116
 117     def follow_trace(self, guid, trace_id, filename):
 118         if guid not in self._traces:
 119             self._traces[guid] = dict()
 120         self._traces[guid][trace_id] = filename
 121
 122     def shutdown(self):
 123         for element in self._elements.values():
 124             if isinstance(element, self.LOCAL_TYPES):
 125                 # graceful shutdown of locally-implemented objects
 126                 element.Cleanup()
 127             element = None
 128         sys.stdout.flush()
 129         sys.stderr.flush()
 130
 131     def _simulator_run(self, condition):
 132         # Run simulation
 133         self.ns3.Simulator.Run()
 134         # Signal condition on simulation end to notify waiting threads
 135         condition.acquire()
 136         condition.notifyAll()
 137         condition.release()
 138
 139     def _schedule_event(self, condition, func, *args):
 140         """Schedules event on running experiment"""
 141         def execute_event(condition, has_event_occurred, func, *args):
 142             # exec func
 143             try:
 144                 func(*args)
 145             finally:
 146                 # flag event occured
 147                 has_event_occurred[0] = True
 148                 # notify condition indicating attribute was set
 149                 condition.acquire()
 150                 condition.notifyAll()
 151                 condition.release()
 152
 153         # contextId is defined as general context
 154         contextId = long(0xffffffff)
 155         # delay 0 means that the event is expected to execute inmediately
 156         delay = self.ns3.Seconds(0)
 157         # flag to indicate that the event occured
 158         # because bool is an inmutable object in python, in order to create a
 159         # bool flag, a list is used as wrapper
 160         has_event_occurred = [False]
 161         condition.acquire()
 162         if not self.ns3.Simulator.IsFinished():
 163             self.ns3.Simulator.ScheduleWithContext(contextId, delay, execute_event,
 164                  condition, has_event_occurred, func, *args)
 165             while not has_event_occurred[0] and not self.ns3.Simulator.IsFinished():
 166                 condition.wait()
 167                 condition.release()
 168
 169     def _set_attribute(self, name, ns3_value, element):
 170         if self.status() == TESTBED_STATUS_STARTED:
 171             # schedule the event in the Simulator
 172             self._schedule_event(self._condition, self._set_ns3_attribute,
 173                     name, ns3_value, element)
 174         else:
 175             self._set_ns3_attribute(name, ns3_value, element)
 176
 177     def _get_attribute(self, name, ns3_value, element):
 178         if self.status() == TESTBED_STATUS_STARTED:
 179             # schedule the event in the Simulator
 180             self._schedule_event(self._condition, self._get_ns3_attribute,
 181                     name, ns3_value, element)
 182         else:
 183             self._get_ns3_attribute(name, ns3_value, element)
 184
 185     def _set_ns3_attribute(self, name, ns3_value, element):
 186         element.SetAttribute(name, ns3_value)
 187
 188     def _get_ns3_attribute(self, name, ns3_value, element):
 189         element.GetAttribute(name, ns3_value)
 190
 191     def _to_ns3_value(self, guid, name, value):
 192         factory_id = self._create[guid]
 193         TypeId = self.ns3.TypeId()
 194         typeid = TypeId.LookupByName(factory_id)
 195         info = TypeId.AttributeInfo()
 196         if not typeid.LookupAttributeByName(name, info):
 197             raise RuntimeError("Attribute %s doesn't belong to element %s" \
 198                    % (name, factory_id))
 199         str_value = str(value)
 200         if isinstance(value, bool):
 201             str_value = str_value.lower()
 202         checker = info.checker
 203         ns3_value = checker.Create()
 204         ns3_value.DeserializeFromString(str_value, checker)
 205         return ns3_value
 206
 207     def _load_ns3_module(self):
 208         import ctypes
 209         import imp
 210
 211         simu_impl_type = self._attributes.get_attribute_value(
 212                 "SimulatorImplementationType")
 213         checksum = self._attributes.get_attribute_value("ChecksumEnabled")
 214         stop_time = self._attributes.get_attribute_value("StopTime")
 215
 216         bindings = os.environ["NEPI_NS3BINDINGS"] \
 217                 if "NEPI_NS3BINDINGS" in os.environ else None
 218         libfile = os.environ["NEPI_NS3LIBRARY"] \
 219                 if "NEPI_NS3LIBRARY" in os.environ else None
 220
 221         if libfile:
 222             ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
 223
 224         path = [ os.path.dirname(__file__) ] + sys.path
 225         if bindings:
 226             path = [ bindings ] + path
 227
 228         try:
 229             module = imp.find_module ('ns3', path)
 230             mod = imp.load_module ('ns3', *module)
 231         except ImportError:
 232             # In some environments, ns3 per-se does not exist,
 233             # only the low-level _ns3
 234             module = imp.find_module ('_ns3', path)
 235             mod = imp.load_module ('_ns3', *module)
 236             sys.modules["ns3"] = mod # install it as ns3 too
 237
 238             # When using _ns3, we have to make sure we destroy
 239             # the simulator when the process finishes
 240             import atexit
 241             atexit.register(mod.Simulator.Destroy)
 242
 243         if simu_impl_type:
 244             value = mod.StringValue(simu_impl_type)
 245             mod.GlobalValue.Bind ("SimulatorImplementationType", value)
 246         if checksum:
 247             value = mod.BooleanValue(checksum)
 248             mod.GlobalValue.Bind ("ChecksumEnabled", value)
 249         if stop_time:
 250             value = mod.Time(stop_time)
 251             mod.Simulator.Stop (value)
 252         return mod
 253
 254     def _get_construct_parameters(self, guid):
 255         params = self._get_parameters(guid)
 256         construct_params = dict()
 257         factory_id = self._create[guid]
 258         TypeId = self.ns3.TypeId()
 259         typeid = TypeId.LookupByName(factory_id)
 260         for name, value in params.iteritems():
 261             info = self.ns3.TypeId.AttributeInfo()
 262             found = typeid.LookupAttributeByName(name, info)
 263             if found and \
 264                 (info.flags & TypeId.ATTR_CONSTRUCT == TypeId.ATTR_CONSTRUCT):
 265                 construct_params[name] = value
 266         return construct_params
 267
 268
 269