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"""Kombu transport using the Django database as a message store."""
from __future__ import absolute_import
from django.conf import settings
from django.core import exceptions as errors
from kombu.five import Empty
from kombu.transport import virtual
from kombu.utils.encoding import bytes_to_str
from kombu.utils.json import loads, dumps
from .models import Queue
VERSION = (1, 0, 0)
__version__ = '.'.join(map(str, VERSION))
POLLING_INTERVAL = getattr(settings, 'KOMBU_POLLING_INTERVAL',
getattr(settings, 'DJKOMBU_POLLING_INTERVAL', 5.0))
class Channel(virtual.Channel):
def _new_queue(self, queue, **kwargs):
Queue.objects.get_or_create(name=queue)
def _put(self, queue, message, **kwargs):
Queue.objects.publish(queue, dumps(message))
def basic_consume(self, queue, *args, **kwargs):
qinfo = self.state.bindings[queue]
exchange = qinfo[0]
if self.typeof(exchange).type == 'fanout':
return
super(Channel, self).basic_consume(queue, *args, **kwargs)
def _get(self, queue):
m = Queue.objects.fetch(queue)
if m:
return loads(bytes_to_str(m))
raise Empty()
def _size(self, queue):
return Queue.objects.size(queue)
def _purge(self, queue):
return Queue.objects.purge(queue)
def refresh_connection(self):
from django import db
db.close_connection()
class Transport(virtual.Transport):
Channel = Channel
default_port = 0
polling_interval = POLLING_INTERVAL
channel_errors = (
virtual.Transport.channel_errors + (
errors.ObjectDoesNotExist, errors.MultipleObjectsReturned)
)
driver_type = 'sql'
driver_name = 'django'
def driver_version(self):
import django
return '.'.join(map(str, django.VERSION))
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