src/nepi/testbeds/ns3/execute.py

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