src/nepi/resources/netns/netnsapplication.py

   1 #
   2 #    NEPI, a framework to manage network experiments
   3 #    Copyright (C) 2014 INRIA
   4 #
   5 #    This program is free software: you can redistribute it and/or modify
   6 #    it under the terms of the GNU General Public License as published by
   7 #    the Free Software Foundation, either version 3 of the License, or
   8 #    (at your option) any later version.
   9 #
  10 #    This program is distributed in the hope that it will be useful,
  11 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 #    GNU General Public License for more details.
  14 #
  15 #    You should have received a copy of the GNU General Public License
  16 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 #
  18 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
  19
  20 from nepi.execution.attribute import Attribute, Flags, Types
  21 from nepi.execution.resource import clsinit_copy
  22 from nepi.resources.netns.netnsbase import NetNSBase
  23 from nepi.execution.resource import clsinit_copy, ResourceState, \
  24         reschedule_delay
  25
  26 import shlex
  27
  28 @clsinit_copy
  29 class NetNSApplication(NetNSBase):
  30     _rtype = "netns::Application"
  31
  32     def __init__(self, ec, guid):
  33         super(NetNSApplication, self).__init__(ec, guid)
  34         self._traces = dict()
  35
  36     @classmethod
  37     def _register_attributes(cls):
  38         command = Attribute("command", "Command to execute", flags=Flags.Design)
  39         cls._register_attribute(command)
  40
  41     @property
  42     def emulation(self):
  43         return self.node.emulation
  44
  45     @property
  46     def node(self):
  47         from nepi.resources.netns.netnsnode import NetNSNode
  48         node = self.get_connected(NetNSNode.get_rtype())
  49
  50         if not node:
  51             msg = "Route not connected to Node!!"
  52             self.error(msg)
  53             raise RuntimeError, msg
  54
  55         return node[0]
  56
  57     @property
  58     def _rms_to_wait(self):
  59         return [self.node]
  60
  61     def do_start(self):
  62         if self.simulation.state < ResourceState.STARTED:
  63             self.debug("---- RESCHEDULING START ----" )
  64             self.ec.schedule(reschedule_delay, self.start)
  65         else:
  66             self._configure_traces()
  67
  68             command = shlex.split(self.get("command"))
  69             stdout = self._traces["stdout"]
  70             stderr = self._traces["stderr"]
  71             self._uuid = self.emulation.invoke(self.node.uuid,
  72                     "Popen", command, stdout = stdout,
  73                     stderr = stderr)
  74
  75             super(NetNSApplication, self).do_start()
  76             self._start_time = self.emulation.start_time
  77
  78     def _configure_traces(self):
  79         stdout = "%s/%d.stdout " % (self.emulation.run_home, self.pid)
  80         stderr = "%s/%d.stderr " % (self.emulation.run_home, self.pid)
  81         self._trace_filename["stdout"] = stdout
  82         self._trace_filename["stderr"] = stderr
  83         self._traces["stdout"] = self.emulation.create("open", stdout, "w")
  84         self._traces["stderr"] = self.emulation.create("open", stderr, "w")
  85
  86     @property
  87     def state(self):
  88         if self._state == ResourceState.STARTED:
  89             retcode = self.emulation.invoke(self.uuid, "poll")
  90
  91             if retcode:
  92                 if ret == 0:
  93                     self.set_stopped()
  94                 else:
  95                     out = ""
  96                     msg = " Failed to execute command '%s'" % self.get("command")
  97                     err = self.trace("stderr")
  98                     self.error(msg, out, err)
  99                     self.do_fail()
 100
 101         return self._state
 102