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"""
kombu.transport.mongodb
=======================
MongoDB transport.
:copyright: (c) 2010 - 2012 by Flavio Percoco Premoli.
:license: BSD, see LICENSE for more details.
"""
from __future__ import absolute_import
from Queue import Empty
import pymongo
from pymongo import errors
from anyjson import loads, dumps
from pymongo.connection import Connection
from . import virtual
DEFAULT_HOST = "127.0.0.1"
DEFAULT_PORT = 27017
__author__ = "Flavio [FlaPer87] Percoco Premoli <flaper87@flaper87.org>"
class Channel(virtual.Channel):
_client = None
def _new_queue(self, queue, **kwargs):
pass
def _get(self, queue):
try:
msg = self.client.database.command("findandmodify", "messages",
query={"queue": queue},
sort={"_id": pymongo.ASCENDING}, remove=True)
except errors.OperationFailure, exc:
if "No matching object found" in exc.args[0]:
raise Empty()
raise
# as of mongo 2.0 empty results won't raise an error
if msg['value'] is None:
raise Empty()
return loads(msg["value"]["payload"])
def _size(self, queue):
return self.client.find({"queue": queue}).count()
def _put(self, queue, message, **kwargs):
self.client.insert({"payload": dumps(message), "queue": queue})
def _purge(self, queue):
size = self._size(queue)
self.client.remove({"queue": queue})
return size
def close(self):
super(Channel, self).close()
if self._client:
self._client.database.connection.end_request()
def _open(self):
conninfo = self.connection.client
mongoconn = Connection(host=conninfo.hostname, port=conninfo.port)
dbname = conninfo.virtual_host
version = mongoconn.server_info()["version"]
if tuple(map(int, version.split(".")[:2])) < (1, 3):
raise NotImplementedError(
"Kombu requires MongoDB version 1.3+, but connected to %s" % (
version, ))
if not dbname or dbname == "/":
dbname = "kombu_default"
database = getattr(mongoconn, dbname)
if conninfo.userid:
database.authenticate(conninfo.userid, conninfo.password)
col = database.messages
col.ensure_index([("queue", 1)])
return col
@property
def client(self):
if self._client is None:
self._client = self._open()
return self._client
class Transport(virtual.Transport):
Channel = Channel
interval = 1
default_port = DEFAULT_PORT
connection_errors = (errors.ConnectionFailure, )
channel_errors = (errors.ConnectionFailure,
errors.OperationFailure, )
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