Move queue monitor startup into a function

This allows it to be used by the test framework.

src/pylorax/api/queue.py

@@ -20,6 +20,7 @@ log = logging.getLogger("pylorax")
 import os
 import grp
 from glob import glob
+import multiprocessing as mp
 import pytoml as toml
 import pwd
 import shutil
@@ -34,7 +35,23 @@ from pylorax.base import DataHolder
 from pylorax.installer import novirt_install
 from pylorax.sysutils import joinpaths
 
-# TODO needs a quit queue to cleanly manage quitting
+def start_queue_monitor(cfg, uid, gid):
+    """Start the queue monitor as a mp process
+
+    :param cfg: Configuration settings
+    :type cfg: ComposerConfig
+    :param uid: User ID that owns the queue
+    :type uid: int
+    :param gid: Group ID that owns the queue
+    :type gid: int
+    :returns: None
+    """
+    lib_dir = cfg.get("composer", "lib_dir")
+    monitor_cfg = DataHolder(composer_dir=lib_dir, uid=uid, gid=gid)
+    p = mp.Process(target=monitor, args=(monitor_cfg,))
+    p.daemon = True
+    p.start()
+
 def monitor(cfg):
     """Monitor the queue for new compose requests
 

src/sbin/lorax-composer

@@ -26,7 +26,6 @@ yum_log = logging.getLogger("yum")
 
 import argparse
 import grp
-import multiprocessing as mp
 import os
 import pwd
 import sys
@@ -36,11 +35,10 @@ from gevent.wsgi import WSGIServer
 
 from pylorax import vernum
 from pylorax.api.config import configure, make_yum_dirs, make_queue_dirs
-from pylorax.api.queue import monitor
+from pylorax.api.queue import start_queue_monitor
 from pylorax.api.recipes import open_or_create_repo, commit_recipe_directory
 from pylorax.api.server import server, GitLock, YumLock
 from pylorax.api.yumbase import get_base_object
-from pylorax.base import DataHolder
 
 VERSION = "{0}-{1}".format(os.path.basename(sys.argv[0]), vernum)
 
@@ -204,12 +202,7 @@ if __name__ == '__main__':
     os.chown(opts.socket, 0, gid)
     listener.listen(1)
 
-    # Start queue monitor thread as root
-    lib_dir = server.config["COMPOSER_CFG"].get("composer", "lib_dir")
-    cfg = DataHolder(composer_dir=lib_dir, uid=uid, gid=gid)
-    p = mp.Process(target=monitor, args=(cfg,))
-    p.daemon = True
-    p.start()
+    start_queue_monitor(server.config["COMPOSER_CFG"], uid, gid)
 
     # Drop root privileges on the main process
     os.setgid(gid)