src/nepi/resources/linux/ccn/ccncontent.py

   1 #
   2 #    NEPI, a framework to manage network experiments
   3 #    Copyright (C) 2013 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, ResourceState, \
  22     ResourceAction, reschedule_delay
  23 from nepi.resources.linux.ccn.ccnapplication import LinuxCCNApplication
  24 from nepi.resources.linux.ccn.ccnr import LinuxCCNR
  25 from nepi.util.timefuncs import tnow
  26
  27 import os
  28
  29 @clsinit_copy
  30 class LinuxCCNContent(LinuxCCNApplication):
  31     _rtype = "LinuxCCNContent"
  32
  33     @classmethod
  34     def _register_attributes(cls):
  35         content_name = Attribute("contentName",
  36                 "The name of the content to publish (e.g. ccn:/VIDEO) ",
  37                 flags = Flags.ExecReadOnly)
  38
  39         content = Attribute("content",
  40                 "The content to publish. It can be a path to a file or plain text ",
  41                 flags = Flags.ExecReadOnly)
  42
  43         cls._register_attribute(content_name)
  44         cls._register_attribute(content)
  45
  46     def __init__(self, ec, guid):
  47         super(LinuxCCNContent, self).__init__(ec, guid)
  48         self._home = "content-%s" % self.guid
  49
  50     @property
  51     def ccnr(self):
  52         ccnr = self.get_connected(LinuxCCNR.rtype())
  53         if ccnr: return ccnr[0]
  54         return None
  55
  56     @property
  57     def node(self):
  58         if self.ccnr: return self.ccnr.node
  59         return None
  60
  61     def deploy(self):
  62         if not self.ccnr or self.ccnr.state < ResourceState.READY:
  63             self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state )
  64
  65             # ccnr needs to wait until ccnd is deployed and running
  66             self.ec.schedule(reschedule_delay, self.deploy)
  67         else:
  68             command = self._start_command
  69             env = self._environment
  70
  71             self.set("command", command)
  72             self.set("env", env)
  73
  74             # set content to stdin, so the content will be
  75             # uploaded during provision
  76             self.set("stdin", self.get("content"))
  77
  78             self.info("Deploying command '%s' " % command)
  79
  80             self.node.mkdir(self.app_home)
  81
  82             # upload content
  83             self.upload_stdin()
  84
  85             # We want to make sure the content is published
  86             # before the experiment starts.
  87             # Run the command as a bash script in the background,
  88             # in the host ( but wait until the command has
  89             # finished to continue )
  90             (out, err), proc = self.execute_command(command, env)
  91
  92             if proc.poll():
  93                 self._state = ResourceState.FAILED
  94                 msg = "Failed to execute command"
  95                 self.error(msg, out, err)
  96                 raise RuntimeError, msg
  97
  98             self.debug("----- READY ---- ")
  99             self._ready_time = tnow()
 100             self._state = ResourceState.READY
 101
 102     def start(self):
 103         if self._state == ResourceState.READY:
 104             command = self.get("command")
 105             self.info("Starting command '%s'" % command)
 106
 107             self._start_time = tnow()
 108             self._state = ResourceState.STARTED
 109         else:
 110             msg = " Failed to execute command '%s'" % command
 111             self.error(msg, out, err)
 112             self._state = ResourceState.FAILED
 113             raise RuntimeError, msg
 114
 115     @property
 116     def state(self):
 117         return self._state
 118
 119     @property
 120     def _start_command(self):
 121         return "ccnseqwriter -r %s < %s" % (self.get("contentName"),
 122                 os.path.join(self.app_home, 'stdin'))
 123
 124     def valid_connection(self, guid):
 125         # TODO: Validate!
 126         return True
 127