vmcelery: added argument handling to start celery dynamic instances

vmcelery.py

 """ Celery module for libvirt RPC calls. """
 """ Celery module for libvirt RPC calls. """
 from celery import Celery
 from celery import Celery
 from kombu import Queue, Exchange
 from kombu import Queue, Exchange
-from socket import gethostname
 from os import getenv
 from os import getenv
 
 
+from argparse import ArgumentParser
+
+parser = ArgumentParser()
+parser.add_argument("-n", "--hostname", dest="hostname",
+                    help="Define the full queue name with"
+                    "with priority", metavar="hostname.queue.priority")
+(args, unknwon_args) = parser.parse_known_args()
+HOSTNAME = vars(args).pop("hostname")
+if HOSTNAME is None:
+    raise Exception("You must define hostname as -n <hostname> or "
+                    "--hostname=<hostname>.\n"
+                    "Hostname format must be hostname.module.priority.")
 
 
-HOSTNAME = gethostname()
 AMQP_URI = getenv('AMQP_URI')
 AMQP_URI = getenv('AMQP_URI')
 CACHE_URI = getenv('CACHE_URI')
 CACHE_URI = getenv('CACHE_URI')
 
 
@@ -24,7 +34,7 @@ celery.conf.update(
     CELERY_CACHE_BACKEND=CACHE_URI,
     CELERY_CACHE_BACKEND=CACHE_URI,
     CELERY_TASK_RESULT_EXPIRES=300,
     CELERY_TASK_RESULT_EXPIRES=300,
     CELERY_QUEUES=(
     CELERY_QUEUES=(
-        Queue(HOSTNAME + '.vm', Exchange(
+        Queue(HOSTNAME, Exchange(
             'vmdriver', type='direct'), routing_key="vmdriver"),
             'vmdriver', type='direct'), routing_key="vmdriver"),
     )
     )
 )
 )