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 from nepi.util.constants import TIME_NOW
   7 import os
   8 import time
   9
  10 class TestbedController(testbed_impl.TestbedController):
  11     def __init__(self, testbed_version):
  12         super(TestbedController, self).__init__(TESTBED_ID, testbed_version)
  13         self._home_directory = None
  14         self.slicename = None
  15         self._traces = dict()
  16
  17         import node, interfaces, application
  18         self._node = node
  19         self._interfaces = interfaces
  20         self._app = application
  21
  22     @property
  23     def home_directory(self):
  24         return self._home_directory
  25
  26     @property
  27     def plapi(self):
  28         if not hasattr(self, '_plapi'):
  29             import plcapi
  30
  31             if self.authUser:
  32                 self._plapi = plcapi.PLCAPI(
  33                     username = self.authUser,
  34                     password = self.authString)
  35             else:
  36                 # anonymous access - may not be enough for much
  37                 self._plapi = plcapi.PLCAPI()
  38         return self._plapi
  39
  40     @property
  41     def slice_id(self):
  42         if not hasattr(self, '_slice_id'):
  43             slices = self.plapi.GetSlices(self.slicename, fields=('slice_id',))
  44             if slices:
  45                 self._slice_id = slices[0]['slice_id']
  46             else:
  47                 # If it wasn't found, don't remember this failure, keep trying
  48                 return None
  49         return self._slice_id
  50
  51     def do_setup(self):
  52         self._home_directory = self._attributes.\
  53             get_attribute_value("homeDirectory")
  54         self.slicename = self._attributes.\
  55             get_attribute_value("slice")
  56         self.authUser = self._attributes.\
  57             get_attribute_value("authUser")
  58         self.authString = self._attributes.\
  59             get_attribute_value("authPass")
  60         self.sliceSSHKey = self._attributes.\
  61             get_attribute_value("sliceSSHKey")
  62         super(TestbedController, self).do_setup()
  63
  64     def do_preconfigure(self):
  65         # Perform resource discovery if we don't have
  66         # specific resources assigned yet
  67         self.do_resource_discovery()
  68
  69         # Create PlanetLab slivers
  70         self.do_provisioning()
  71
  72         # Configure elements per XML data
  73         super(TestbedController, self).do_preconfigure()
  74
  75     def do_resource_discovery(self):
  76         # Do what?
  77
  78         # Provisional algo:
  79         #   look for perfectly defined nodes
  80         #   (ie: those with only one candidate)
  81         to_provision = self._to_provision = set()
  82         for guid, node in self._elements.iteritems():
  83             if isinstance(node, self._node.Node) and node._node_id is None:
  84                 # Try existing nodes first
  85                 # If we have only one candidate, simply use it
  86                 candidates = node.find_candidates(
  87                     filter_slice_id = self.slice_id)
  88                 if len(candidates) == 1:
  89                     node.assign_node_id(iter(candidates).next())
  90                 else:
  91                     # Try again including unassigned nodes
  92                     candidates = node.find_candidates()
  93                     if len(candidates) > 1:
  94                         raise RuntimeError, "Cannot assign resources for node %s, too many candidates" % (guid,)
  95                     if len(candidates) == 1:
  96                         node_id = iter(candidates).next()
  97                         node.assign_node_id(node_id)
  98                         to_provision.add(node_id)
  99                     elif not candidates:
 100                         raise RuntimeError, "Cannot assign resources for node %s, no candidates" % (guid,)
 101
 102     def do_provisioning(self):
 103         if self._to_provision:
 104             # Add new nodes to the slice
 105             cur_nodes = self.plapi.GetSlices(self.slicename, ['node_ids'])[0]['node_ids']
 106             new_nodes = list(set(cur_nodes) | self._to_provision)
 107             self.plapi.UpdateSlice(self.slicename, nodes=new_nodes)
 108
 109         # cleanup
 110         del self._to_provision
 111
 112     def set(self, guid, name, value, time = TIME_NOW):
 113         super(TestbedController, self).set(guid, name, value, time)
 114         # TODO: take on account schedule time for the task
 115         element = self._elements[guid]
 116         if element:
 117             setattr(element, name, value)
 118
 119             if hasattr(element, 'refresh'):
 120                 # invoke attribute refresh hook
 121                 element.refresh()
 122
 123     def get(self, guid, name, time = TIME_NOW):
 124         value = super(TestbedController, self).get(guid, name, time)
 125         # TODO: take on account schedule time for the task
 126         factory_id = self._create[guid]
 127         factory = self._factories[factory_id]
 128         if factory.box_attributes.is_attribute_design_only(name):
 129             return value
 130         element = self._elements.get(guid)
 131         try:
 132             return getattr(element, name)
 133         except KeyError, AttributeError:
 134             return value
 135
 136     def get_address(self, guid, index, attribute='Address'):
 137         index = int(index)
 138
 139         # try the real stuff
 140         iface = self._elements.get(guid)
 141         if iface and index == 0:
 142             if attribute == 'Address':
 143                 return iface.address
 144             elif attribute == 'NetPrefix':
 145                 return iface.netprefix
 146             elif attribute == 'Broadcast':
 147                 return iface.broadcast
 148
 149         # if all else fails, query box
 150         return self.get_address(guid, index, attribute)
 151
 152     def action(self, time, guid, action):
 153         raise NotImplementedError
 154
 155     def shutdown(self):
 156         for trace in self._traces.values():
 157             trace.close()
 158         for element in self._elements.values():
 159             # invoke cleanup hooks
 160             if hasattr(element, 'cleanup'):
 161                 element.cleanup()
 162
 163     def trace(self, guid, trace_id, attribute='value'):
 164         app = self._elements[guid]
 165
 166         if attribute == 'value':
 167             path = app.sync_trace(self.home_directory, trace_id)
 168             if path:
 169                 fd = open(path, "r")
 170                 content = fd.read()
 171                 fd.close()
 172             else:
 173                 content = None
 174         elif attribute == 'path':
 175             content = app.remote_trace_path(trace_id)
 176         else:
 177             content = None
 178         return content
 179
 180     def follow_trace(self, trace_id, trace):
 181         self._traces[trace_id] = trace
 182
 183     def _make_generic(self, parameters, kind):
 184         app = kind(self.plapi)
 185
 186         # Note: there is 1-to-1 correspondence between attribute names
 187         #   If that changes, this has to change as well
 188         for attr,val in parameters.iteritems():
 189             setattr(app, attr, val)
 190
 191         return app
 192
 193     def _make_node(self, parameters):
 194         node = self._make_generic(parameters, self._node.Node)
 195
 196         # If emulation is enabled, we automatically need
 197         # some vsys interfaces and packages
 198         if node.emulation:
 199             node.required_vsys.add('ipfw-be')
 200             node.required_packages.add('ipfwslice')
 201
 202         return node
 203
 204     def _make_node_iface(self, parameters):
 205         return self._make_generic(parameters, self._interfaces.NodeIface)
 206
 207     def _make_tun_iface(self, parameters):
 208         return self._make_generic(parameters, self._interfaces.TunIface)
 209
 210     def _make_netpipe(self, parameters):
 211         return self._make_generic(parameters, self._interfaces.NetPipe)
 212
 213     def _make_internet(self, parameters):
 214         return self._make_generic(parameters, self._interfaces.Internet)
 215
 216     def _make_application(self, parameters):
 217         return self._make_generic(parameters, self._app.Application)
 218
 219     def _make_dependency(self, parameters):
 220         return self._make_generic(parameters, self._app.Dependency)
 221
 222     def _make_nepi_dependency(self, parameters):
 223         return self._make_generic(parameters, self._app.NepiDependency)
 224
 225