sfa/planetlab/nodemanager.py

   1 import tempfile
   2 import commands
   3 import os
   4
   5 class NodeManager:
   6
   7     method = None
   8
   9     def __init__(self, config):
  10         self.config = config
  11
  12     def __getattr__(self, method):
  13         self.method = method
  14         return self.__call__
  15
  16     def __call__(self, *args):
  17         method = self.method
  18         sfa_slice_prefix = self.config.SFA_CM_SLICE_PREFIX
  19         sfa_slice = sfa_slice_prefix + "_sfacm"
  20         python = "/usr/bin/python"
  21         vserver_path = "/vservers/%s" % (sfa_slice)
  22         script_path = "/tmp/"
  23         path = "%(vserver_path)s/%(script_path)s" % locals()
  24         (fd, filename) = tempfile.mkstemp(dir=path)
  25         scriptname = script_path + os.sep + filename.split(os.sep)[-1:][0]
  26         # define the script to execute
  27         script = """
  28 #!%(python)s
  29 import xmlrpclib
  30 s = xmlrpclib.ServerProxy('http://127.0.0.1:812')
  31 print s.%(method)s%(args)s"""  % locals()
  32
  33         try:
  34             # write the script to a temporary file
  35             f = open(filename, 'w')
  36             f.write(script % locals())
  37             f.close()
  38             # make the file executeable
  39             chmod_cmd = "/bin/chmod 775 %(filename)s" % locals()
  40             (status, output) = commands.getstatusoutput(chmod_cmd)
  41
  42             # execute the commad as a slice with root NM privs
  43             cmd = 'su - %(sfa_slice)s -c "%(python)s %(scriptname)s"' % locals()
  44             (status, output) = commands.getstatusoutput(cmd)
  45             return (status, output)
  46         finally: os.unlink(filename)