Merge branch 'feature-priority-queues' into 'master'

Feature Priority Queues

Updated to use priority queues

disk.py

@@ -44,12 +44,14 @@ class Disk(object):
 
     @classmethod
     def deserialize(cls, desc):
+        """Create cls object from JSON."""
         logging.info(desc)
         if isinstance(desc, basestring):
             desc = json.loads(desc)
         return cls(**desc)
 
     def get_desc(self):
+        """Create dict from Disk object."""
         return {
             'name': self.name,
             'dir': self.dir,
@@ -59,9 +61,11 @@ class Disk(object):
         }
 
     def get_path(self):
+        """Get absolute path for disk."""
         return os.path.realpath(self.dir + '/' + self.name)
 
     def get_base(self):
+        """Get absolute path for disk's base image."""
         return os.path.realpath(self.dir + '/' + self.base_name)
 
     def __unicode__(self):
@@ -70,8 +74,7 @@ class Disk(object):
 
     @classmethod
     def get(cls, dir, name):
-        ''' Create disk from path
-        '''
+        """Create disk from path."""
         path = os.path.realpath(dir + '/' + name)
         output = subprocess.check_output(['qemu-img', 'info', path])
 
@@ -92,9 +95,9 @@ class Disk(object):
         return Disk(dir, name, format, size, base, type)
 
     def create(self):
-        ''' Creating new image format specified at self.format.
-            self.format van be "qcow2-normal"
-        '''
+        """ Creating new image format specified at self.format.
+            self.format can be "qcow2-normal"
+        """
         # Check if type is avaliable to create
         if self.format not in self.CREATE_FORMATS:
             raise Exception('Invalid format: %s' % self.format)
@@ -114,7 +117,7 @@ class Disk(object):
         subprocess.check_output(cmdline)
 
     def download(self, task, url, parent_id=None):  # noqa
-        ''' Download image from url. '''
+        """Download image from url."""
         disk_path = self.get_path()
         logger.info("Downloading image from %s to %s", url, disk_path)
         r = requests.get(url, stream=True)
@@ -221,8 +224,8 @@ class Disk(object):
             subprocess.check_output(cmdline)
 
     def merge(self, new_disk):
-        ''' Merging a new_disk from the actual disk and its base.
-        '''
+        """ Merging a new_disk from the actual disk and its base.
+        """
         # Check if file already exists
         if os.path.isfile(new_disk.get_path()):
             raise Exception('File already exists: %s' % self.get_path())
@@ -240,11 +243,11 @@ class Disk(object):
             copy(self.get_path(), new_disk.get_path())
 
     def delete(self):
-        ''' Delete file
-        '''
+        """ Delete file. """
         if os.path.isfile(self.get_path()):
             os.unlink(self.get_path())
 
     @classmethod
     def list(cls, dir):
+        """ List all files in <dir> directory."""
         return [cls.get(dir, file) for file in os.listdir(dir)]

miscellaneous/storage.conf

+description "IK Cloud Django Development Server"
+
+start on runlevel [2345]
+stop on runlevel [!2345]
+
+pre-start script
+    hostname=$(hostname -s)
+    for inst in storage.fast storage.slow
+    do
+        start storagecelery NAME=$hostname.$inst || :
+    done
+end script
+
+post-stop script
+    for inst in `initctl list|grep "^storagecelery "|awk '{print $2}'|tr -d ')'|tr -d '('`
+    do
+        stop storagecelery NAME=$inst || :
+    done
+end script

miscellaneous/storagecelery.conf

-description "CIRCLE Storage Driver Celery Upstart"
-
-start on runlevel [2345]
-stop on runlevel [!2345]
+description	"IK Cloud Django Development Server"
 
 respawn
 respawn limit 30 30
-setgid cloud
 setuid cloud
+setgid cloud
 
-chdir /home/cloud/storagedriver
+instance $NAME
 
 script
-    . /home/cloud/.virtualenvs/storage/local/bin/activate
-    . /home/cloud/.virtualenvs/storage/local/bin/postactivate
-    HOSTNAME=$(hostname -s)
-    exec celery -A storagecelery worker --loglevel=info -n ${HOSTNAME}.storage
+    cd /home/cloud/storagedriver/
+    . /home/cloud/.virtualenvs/storagedriver/local/bin/activate
+    . /home/cloud/.virtualenvs/storagedriver/local/bin/postactivate
+    exec celery -A storagecelery worker --loglevel=info -n $NAME
 end script

storagecelery.py

 from celery import Celery
 from kombu import Queue, Exchange
-from socket import gethostname
 from os import getenv
-HOSTNAME = gethostname()
+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.")
+
 AMQP_URI = getenv('AMQP_URI')
 CACHE_URI = getenv('CACHE_URI')
 
@@ -15,7 +27,7 @@ celery.conf.update(
     CELERY_CACHE_BACKEND=CACHE_URI,
     CELERY_TASK_RESULT_EXPIRES=300,
     CELERY_QUEUES=(
-        Queue(HOSTNAME + '.storage', Exchange(
+        Queue(HOSTNAME, Exchange(
             'storagedriver', type='direct'), routing_key='storagedriver'),
     )
 )