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 version 2 as
   7 #    published by the Free Software Foundation;
   8 #
   9 #    This program is distributed in the hope that it will be useful,
  10 #    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 #    GNU General Public License for more details.
  13 #
  14 #    You should have received a copy of the GNU General Public License
  15 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 #
  17 # Author: Alina Quereilhac <alina.quereilhac@inria.fr>
  18
  19 from nepi.execution.attribute import Attribute, Flags, Types
  20 from nepi.resources.netns.netnsbase import NetNSBase
  21 from nepi.execution.resource import clsinit_copy, ResourceState
  22
  23 import shlex
  24
  25 @clsinit_copy
  26 class NetNSApplication(NetNSBase):
  27     _rtype = "netns::Application"
  28
  29     def __init__(self, ec, guid):
  30         super(NetNSApplication, self).__init__(ec, guid)
  31         self._traces = dict()
  32
  33     @classmethod
  34     def _register_attributes(cls):
  35         command = Attribute("command", "Command to execute", flags=Flags.Design)
  36         cls._register_attribute(command)
  37
  38     @property
  39     def emulation(self):
  40         return self.node.emulation
  41
  42     @property
  43     def node(self):
  44         from nepi.resources.netns.netnsnode import NetNSNode
  45         node = self.get_connected(NetNSNode.get_rtype())
  46
  47         if not node:
  48             msg = "Route not connected to Node!!"
  49             self.error(msg)
  50             raise RuntimeError(msg)
  51
  52         return node[0]
  53
  54     @property
  55     def _rms_to_wait(self):
  56         return [self.node]
  57
  58     def do_start(self):
  59         if self.emulation.state < ResourceState.STARTED:
  60             self.debug("---- RESCHEDULING START ----" )
  61             self.ec.schedule(self.reschedule_delay, self.start)
  62         else:
  63             self._configure_traces()
  64
  65             command = shlex.split(self.get("command"))
  66             stdout = self._traces["stdout"]
  67             stderr = self._traces["stderr"]
  68             self._uuid = self.emulation.invoke(self.node.uuid,
  69                     "Popen", command, stdout = stdout,
  70                     stderr = stderr)
  71
  72             super(NetNSApplication, self).do_start()
  73             self._start_time = self.emulation.start_time
  74
  75     def _configure_traces(self):
  76         stdout = "%s/%d.stdout" % (self.emulation.run_home, self.guid)
  77         stderr = "%s/%d.stderr" % (self.emulation.run_home, self.guid)
  78         self._trace_filename["stdout"] = stdout
  79         self._trace_filename["stderr"] = stderr
  80         self._traces["stdout"] = self.emulation.create("open", stdout, "w")
  81         self._traces["stderr"] = self.emulation.create("open", stderr, "w")
  82
  83     @property
  84     def state(self):
  85         if self._state == ResourceState.STARTED:
  86             retcode = self.emulation.invoke(self.uuid, "poll")
  87
  88             if retcode is not None:
  89                 if retcode == 0:
  90                     self.set_stopped()
  91                 else:
  92                     out = ""
  93                     msg = " Failed to execute command '%s'" % self.get("command")
  94                     err = self.trace("stderr")
  95                     self.error(msg, out, err)
  96                     self.do_fail()
  97
  98         return self._state
  99