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.util.constants import AF_INET, AF_INET6
   7 import os
   8
   9 class TestbedInstance(testbed_impl.TestbedInstance):
  10     def __init__(self, testbed_version):
  11         super(TestbedInstance, self).__init__(TESTBED_ID, testbed_version)
  12         self._ns3 = None
  13         self._home_directory = None
  14         self._traces = dict()
  15
  16     @property
  17     def home_directory(self):
  18         return self._home_directory
  19
  20     @property
  21     def ns3(self):
  22         return self._ns3
  23
  24     def do_setup(self):
  25         self._home_directory = self._attributes.\
  26             get_attribute_value("homeDirectory")
  27         self._ns3 = self._load_ns3_module()
  28
  29     def do_configure(self):
  30         # TODO: add traces!
  31         # configure addressess
  32         for guid, addresses in self._add_address.iteritems():
  33             element = self._elements[guid]
  34             for address in addresses:
  35                 (family, address, netprefix, broadcast) = address
  36                 if family == AF_INET:
  37                     element.add_v4_address(address, netprefix)
  38         # configure routes
  39         for guid, routes in self._add_route.iteritems():
  40             element = self._elements[guid]
  41             for route in routes:
  42                 (destination, netprefix, nexthop) = route
  43                 element.add_route(prefix = destination, prefix_len = netprefix,
  44                         nexthop = nexthop)
  45
  46     def set(self, time, guid, name, value):
  47         super(TestbedInstance, self).set(time, guid, name, value)
  48         factory_id = self._crerate[guid]
  49         element = self._elements[guid]
  50         self._set(element, factory_id, name, value)
  51
  52     def get(self, time, guid, name):
  53         raise NotImplementedError
  54         # TODO: take on account schedule time for the task
  55         #element = self._elements[guid]
  56         #return getattr(element, name)
  57
  58     def action(self, time, guid, action):
  59         raise NotImplementedError
  60
  61     def trace(self, guid, trace_id):
  62         fd = open("%s" % self.trace_filename(guid, trace_id), "r")
  63         content = fd.read()
  64         fd.close()
  65         return content
  66
  67     def shutdown(self):
  68         for trace in self._traces.values():
  69             trace.close()
  70         for element in self._elements.values():
  71             element.destroy()
  72
  73     def trace_filename(self, guid, trace_id):
  74         # TODO: Need to be defined inside a home!!!! with and experiment id_code
  75         return os.path.join(self.home_directory, "%d_%s" % (guid, trace_id))
  76
  77     def follow_trace(self, trace_id, trace):
  78         self._traces[trace_id] = trace
  79
  80     def _set(self, element, factory_id, name, value):
  81         TypeId = self.ns3.TypeId()
  82         typeId = TypeId.LookupByName(factory_id)
  83         index = None
  84         attr_count = typeId.GetAttributeN()
  85         for idx in range(attr_count):
  86             if name == typeId.GetAttributeName(idx)
  87                 index = idx
  88                 break
  89         checker = typeid.GetAttributeChecker(index)
  90         ns3_value = attribute_checker.Create()
  91         value = str(value)
  92         if isinstance(value, bool):
  93             value = value.lower()
  94         ns3_value.DeserializeFromString(value, checker)
  95         element.Set(name, ns3_value)
  96
  97     def _load_ns3_module(self):
  98         import ctypes
  99         import imp
 100
 101         bindings = self._attributes.get_attribute_value("ns3Bindings")
 102         libfile = self._attributes.get_attribute_value("ns3Library")
 103         simu_impl_type = self._attributes.get_attribute_value(
 104                 "SimulatorImplementationType")
 105         checksum = self._attributes.get_attribute_value("ChecksumEnabled")
 106
 107         if libfile:
 108             ctypes.CDLL(libfile, ctypes.RTLD_GLOBAL)
 109
 110         path = [ os.path.dirname(__file__) ] + sys.path
 111         if bindings:
 112             path = [ bindings ] + path
 113
 114         module = imp.find_module ('ns3', path)
 115         mod = imp.load_module ('ns3', *module)
 116
 117         if simu_impl_type:
 118             value = mod.StringValue(simu_impl_type)
 119             mod.GlobalValue.Bind ("SimulatorImplementationType", value)
 120         if checksum:
 121             value = mod.BooleanValue(checksum)
 122             mod.GlobalValue.Bind ("ChecksumEnabled", value)
 123         return mod
 124