src/nepi/testbeds/planetlab/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 import os
   7 import time
   8
   9 class TestbedController(testbed_impl.TestbedController):
  10     def __init__(self, testbed_version):
  11         super(TestbedController, self).__init__(TESTBED_ID, testbed_version)
  12         self._home_directory = None
  13         self.slicename = None
  14         self._traces = dict()
  15
  16         import node, interfaces, application
  17         self._node = node
  18         self._interfaces = interfaces
  19         self._app = application
  20
  21     @property
  22     def home_directory(self):
  23         return self._home_directory
  24
  25     @property
  26     def plapi(self):
  27         if not hasattr(self, '_plapi'):
  28             import plcapi
  29
  30             if self.authUser:
  31                 self._plapi = plcapi.PLCAPI(
  32                     username = self.authUser,
  33                     password = self.authString)
  34             else:
  35                 # anonymous access - may not be enough for much
  36                 self._plapi = plcapi.PLCAPI()
  37         return self._plapi
  38
  39     @property
  40     def slice_id(self):
  41         if not hasattr(self, '_slice_id'):
  42             slices = self.plapi.GetSlices(self.slicename, fields=('slice_id',))
  43             if slices:
  44                 self._slice_id = slices[0]['slice_id']
  45             else:
  46                 # If it wasn't found, don't remember this failure, keep trying
  47                 return None
  48         return self._slice_id
  49
  50     def do_setup(self):
  51         self._home_directory = self._attributes.\
  52             get_attribute_value("homeDirectory")
  53         self.slicename = self._attributes.\
  54             get_attribute_value("slice")
  55         self.authUser = self._attributes.\
  56             get_attribute_value("authUser")
  57         self.authString = self._attributes.\
  58             get_attribute_value("authPass")
  59         self.sliceSSHKey = self._attributes.\
  60             get_attribute_value("sliceSSHKey")
  61         super(TestbedController, self).do_setup()
  62
  63     def do_preconfigure(self):
  64         # Perform resource discovery if we don't have
  65         # specific resources assigned yet
  66         self.do_resource_discovery()
  67
  68         # Create PlanetLab slivers
  69         self.do_provisioning()
  70
  71         # Configure elements per XML data
  72         super(TestbedController, self).do_preconfigure()
  73
  74     def do_resource_discovery(self):
  75         # Do what?
  76
  77         # Provisional algo:
  78         #   look for perfectly defined nodes
  79         #   (ie: those with only one candidate)
  80         to_provision = self._to_provision = set()
  81         for guid, node in self._elements.iteritems():
  82             if isinstance(node, self._node.Node) and node._node_id is None:
  83                 # Try existing nodes first
  84                 # If we have only one candidate, simply use it
  85                 candidates = node.find_candidates(
  86                     filter_slice_id = self.slice_id)
  87                 if len(candidates) == 1:
  88                     node.assign_node_id(iter(candidates).next())
  89                 else:
  90                     # Try again including unassigned nodes
  91                     candidates = node.find_candidates()
  92                     if len(candidates) > 1:
  93                         raise RuntimeError, "Cannot assign resources for node %s, too many candidates" % (guid,)
  94                     if len(candidates) == 1:
  95                         node_id = iter(candidates).next()
  96                         node.assign_node_id(node_id)
  97                         to_provision.add(node_id)
  98                     elif not candidates:
  99                         raise RuntimeError, "Cannot assign resources for node %s, no candidates" % (guid,)
 100
 101     def do_provisioning(self):
 102         if self._to_provision:
 103             # Add new nodes to the slice
 104             cur_nodes = self.plapi.GetSlices(self.slicename, ['node_ids'])[0]['node_ids']
 105             new_nodes = list(set(cur_nodes) | self._to_provision)
 106             self.plapi.UpdateSlice(self.slicename, nodes=new_nodes)
 107
 108         # cleanup
 109         del self._to_provision
 110
 111     def set(self, time, guid, name, value):
 112         super(TestbedController, self).set(time, guid, name, value)
 113         # TODO: take on account schedule time for the task
 114         element = self._elements[guid]
 115         if element:
 116             setattr(element, name, value)
 117
 118             if hasattr(element, 'refresh'):
 119                 # invoke attribute refresh hook
 120                 element.refresh()
 121
 122     def get(self, time, guid, name):
 123         value = super(TestbedController, self).get(time, guid, name)
 124         # TODO: take on account schedule time for the task
 125         factory_id = self._create[guid]
 126         factory = self._factories[factory_id]
 127         if factory.box_attributes.is_attribute_design_only(name):
 128             return value
 129         element = self._elements.get(guid)
 130         try:
 131             return getattr(element, name)
 132         except KeyError, AttributeError:
 133             return value
 134
 135     def get_address(self, guid, index, attribute='Address'):
 136         index = int(index)
 137
 138         # try the real stuff
 139         iface = self._elements.get(guid)
 140         if iface and index == 0:
 141             if attribute == 'Address':
 142                 return iface.address
 143             elif attribute == 'NetPrefix':
 144                 return iface.netprefix
 145             elif attribute == 'Broadcast':
 146                 return iface.broadcast
 147
 148         # if all else fails, query box
 149         return self.get_address(guid, index, attribute)
 150
 151     def action(self, time, guid, action):
 152         raise NotImplementedError
 153
 154     def shutdown(self):
 155         for trace in self._traces.values():
 156             trace.close()
 157         for element in self._elements.values():
 158             # invoke cleanup hooks
 159             if hasattr(element, 'cleanup'):
 160                 element.cleanup()
 161
 162     def trace(self, guid, trace_id, attribute='value'):
 163         app = self._elements[guid]
 164
 165         if attribute == 'value':
 166             path = app.sync_trace(self.home_directory, trace_id)
 167             if path:
 168                 fd = open(path, "r")
 169                 content = fd.read()
 170                 fd.close()
 171             else:
 172                 content = None
 173         elif attribute == 'path':
 174             content = app.remote_trace_path(trace_id)
 175         else:
 176             content = None
 177         return content
 178
 179     def follow_trace(self, trace_id, trace):
 180         self._traces[trace_id] = trace
 181
 182     def _make_generic(self, parameters, kind):
 183         app = kind(self.plapi)
 184
 185         # Note: there is 1-to-1 correspondence between attribute names
 186         #   If that changes, this has to change as well
 187         for attr,val in parameters.iteritems():
 188             setattr(app, attr, val)
 189
 190         return app
 191
 192     def _make_node(self, parameters):
 193         node = self._make_generic(parameters, self._node.Node)
 194
 195         # If emulation is enabled, we automatically need
 196         # some vsys interfaces and packages
 197         if node.emulation:
 198             node.required_vsys.add('ipfw-be')
 199             node.required_packages.add('ipfwslice')
 200
 201         return node
 202
 203     def _make_node_iface(self, parameters):
 204         return self._make_generic(parameters, self._interfaces.NodeIface)
 205
 206     def _make_tun_iface(self, parameters):
 207         return self._make_generic(parameters, self._interfaces.TunIface)
 208
 209     def _make_netpipe(self, parameters):
 210         return self._make_generic(parameters, self._interfaces.NetPipe)
 211
 212     def _make_internet(self, parameters):
 213         return self._make_generic(parameters, self._interfaces.Internet)
 214
 215     def _make_application(self, parameters):
 216         return self._make_generic(parameters, self._app.Application)
 217
 218     def _make_dependency(self, parameters):
 219         return self._make_generic(parameters, self._app.Dependency)
 220
 221     def _make_nepi_dependency(self, parameters):
 222         return self._make_generic(parameters, self._app.NepiDependency)
 223
 224