vcycled

#!/usr/bin/python
#
# vcycled - VM lifecycle manager daemon for OpenStack etc
#
#  Andrew McNab, University of Manchester.
#  Copyright (c) 2013-4. All rights reserved.
#
#  Redistribution and use in source and binary forms, with or
#  without modification, are permitted provided that the following
#  conditions are met:
#
#    o Redistributions of source code must retain the above
#      copyright notice, this list of conditions and the following
#      disclaimer. 
#    o Redistributions in binary form must reproduce the above
#      copyright notice, this list of conditions and the following
#      disclaimer in the documentation and/or other materials
#      provided with the distribution. 
#
#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
#  CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
#  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
#  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
#  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
#  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
#  TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
#  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
#  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
#  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
#  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
#  POSSIBILITY OF SUCH DAMAGE.
#

import uuid
import sys
import getpass
import os
import tempfile
import random
import time
import shutil
import calendar
import threading

from interfaces.openstack.vcycleOpenstack import vcycleOpenstack
from interfaces.occi.vcycleOcci import vcycleOcci
from interfaces.dbce.vcycleDBCE import vcycleDBCE
from interfaces.azure.vcycleAzure import vcycleAzure
import VCYCLE

sleepSeconds      = 60
servers = {}

def cycle(tenancyName, tenancy):
   while True:
      
      try:
         pf = open('/var/run/vcycled.pid', 'r')
         pid = int(pf.read().strip())
         pf.close()
         if pid != os.getpid():
            print 'new /var/run/vcycled.pid - exiting'
            break
      except:
         print 'no /var/run/vcycled.pid - exiting'
         break
   
      VCYCLE.logLine(tenancyName, '=============== Start cycle ===============')
      if tenancy['type'] == 'openstack':
         vOpen = vcycleOpenstack()
      elif tenancy['type'] == 'dbce':
         vOpen = vcycleDBCE()
      elif tenancy['type'] == 'azure':
         vOpen = vcycleAzure()
      try:
         vOpen.oneCycle(tenancyName, tenancy, servers)
      except Exception,e:
         VCYCLE.logLine(tenancyName, str(e))
      VCYCLE.logLine(tenancyName, '================ End cycle ================')
      time.sleep(sleepSeconds)
      

#
# PROGRAM MAIN
#

if __name__ == '__main__':
   
   if os.fork() != 0:
      sys.exit() # first parent
   else:
      os.chdir("/")
      os.setsid()
      os.umask(0)

   if os.fork() != 0:
      sys.exit() # second parent
   else:
      try:
         f = open('/var/run/vcycled.pid', 'w')
         f.write(str(os.getpid()) + '\n')
         f.close()
      except:
         print 'Failed to create /var/run/vcycled.pid - exiting'
         sys.exit(1)
   
   VCYCLE.readConf()
   for tenancyName, tenancy in VCYCLE.tenancies.iteritems():
      threading.Thread(target=cycle,args=(tenancyName,tenancy)).start()