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.application import LinuxApplication
  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(LinuxApplication):
  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 ccnd(self):
  58         if self.ccnr: return self.ccnr.ccnd
  59         return None
  60
  61     @property
  62     def node(self):
  63         if self.ccnr: return self.ccnr.node
  64         return None
  65
  66     def deploy(self):
  67         if not self.ccnr or self.ccnr.state < ResourceState.READY:
  68             self.debug("---- RESCHEDULING DEPLOY ---- node state %s " % self.node.state )
  69
  70             # ccnr needs to wait until ccnd is deployed and running
  71             self.ec.schedule(reschedule_delay, self.deploy)
  72         else:
  73             try:
  74                 if not self.get("command"):
  75                     self.set("command", self._start_command)
  76
  77                 if not self.get("env"):
  78                     self.set("env", self._environment)
  79
  80                 # set content to stdin, so the content will be
  81                 # uploaded during provision
  82                 self.set("stdin", self.get("content"))
  83
  84                 command = self.get("command")
  85
  86                 self.info("Deploying command '%s' " % command)
  87
  88                 self.discover()
  89                 self.provision()
  90             except:
  91                 self.fail()
  92                 raise
  93
  94             self.debug("----- READY ---- ")
  95             self._ready_time = tnow()
  96             self._state = ResourceState.READY
  97
  98     def upload_start_command(self):
  99         command = self.get("command")
 100         env = self.get("env")
 101
 102         if command:
 103             # We want to make sure the content is published
 104             # before the experiment starts.
 105             # Run the command as a bash script in the background,
 106             # in the host ( but wait until the command has
 107             # finished to continue )
 108             env = self.replace_paths(env)
 109             command = self.replace_paths(command)
 110
 111             (out, err), proc = self.execute_command(command, env)
 112
 113             if proc.poll():
 114                 self.fail()
 115                 msg = "Failed to execute command"
 116                 self.error(msg, out, err)
 117                 raise RuntimeError, msg
 118
 119     def start(self):
 120         if self._state == ResourceState.READY:
 121             command = self.get("command")
 122             self.info("Starting command '%s'" % command)
 123
 124             self._start_time = tnow()
 125             self._state = ResourceState.STARTED
 126         else:
 127             msg = " Failed to execute command '%s'" % command
 128             self.error(msg, out, err)
 129             self._state = ResourceState.FAILED
 130             raise RuntimeError, msg
 131
 132     @property
 133     def state(self):
 134         return self._state
 135
 136     @property
 137     def _start_command(self):
 138         return "ccnseqwriter -r %s < %s" % (self.get("contentName"),
 139                 os.path.join(self.app_home, 'stdin'))
 140
 141     @property
 142     def _environment(self):
 143         return self.ccnd.path
 144
 145     def execute_command(self, command, env):
 146         environ = self.node.format_environment(env, inline = True)
 147         command = environ + command
 148         command = self.replace_paths(command)
 149
 150         return self.node.execute(command)
 151
 152     def valid_connection(self, guid):
 153         # TODO: Validate!
 154         return True
 155