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.resources.netns.netnsbase import NetNSBase
  22 from nepi.execution.resource import clsinit_copy, ResourceState
  23
  24 import shlex
  25
  26 @clsinit_copy
  27 class NetNSApplication(NetNSBase):
  28     _rtype = "netns::Application"
  29
  30     def __init__(self, ec, guid):
  31         super(NetNSApplication, self).__init__(ec, guid)
  32         self._traces = dict()
  33
  34     @classmethod
  35     def _register_attributes(cls):
  36         command = Attribute("command", "Command to execute", flags=Flags.Design)
  37         cls._register_attribute(command)
  38
  39     @property
  40     def emulation(self):
  41         return self.node.emulation
  42
  43     @property
  44     def node(self):
  45         from nepi.resources.netns.netnsnode import NetNSNode
  46         node = self.get_connected(NetNSNode.get_rtype())
  47
  48         if not node:
  49             msg = "Route not connected to Node!!"
  50             self.error(msg)
  51             raise RuntimeError, msg
  52
  53         return node[0]
  54
  55     @property
  56     def _rms_to_wait(self):
  57         return [self.node]
  58
  59     def do_start(self):
  60         if self.emulation.state < ResourceState.STARTED:
  61             self.debug("---- RESCHEDULING START ----" )
  62             self.ec.schedule(self.reschedule_delay, self.start)
  63         else:
  64             self._configure_traces()
  65
  66             command = shlex.split(self.get("command"))
  67             stdout = self._traces["stdout"]
  68             stderr = self._traces["stderr"]
  69             self._uuid = self.emulation.invoke(self.node.uuid,
  70                     "Popen", command, stdout = stdout,
  71                     stderr = stderr)
  72
  73             super(NetNSApplication, self).do_start()
  74             self._start_time = self.emulation.start_time
  75
  76     def _configure_traces(self):
  77         stdout = "%s/%d.stdout" % (self.emulation.run_home, self.guid)
  78         stderr = "%s/%d.stderr" % (self.emulation.run_home, self.guid)
  79         self._trace_filename["stdout"] = stdout
  80         self._trace_filename["stderr"] = stderr
  81         self._traces["stdout"] = self.emulation.create("open", stdout, "w")
  82         self._traces["stderr"] = self.emulation.create("open", stderr, "w")
  83
  84     @property
  85     def state(self):
  86         if self._state == ResourceState.STARTED:
  87             retcode = self.emulation.invoke(self.uuid, "poll")
  88
  89             if retcode is not None:
  90                 if retcode == 0:
  91                     self.set_stopped()
  92                 else:
  93                     out = ""
  94                     msg = " Failed to execute command '%s'" % self.get("command")
  95                     err = self.trace("stderr")
  96                     self.error(msg, out, err)
  97                     self.do_fail()
  98
  99         return self._state
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