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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
import pymongo
from pymongo import errors
from anyjson import loads, dumps
from pymongo.connection import Connection
from kombu.exceptions import StdConnectionError, StdChannelError
from kombu.five import Empty
from . import virtual
DEFAULT_HOST = '127.0.0.1'
DEFAULT_PORT = 27017
__author__ = """\
Flavio [FlaPer87] Percoco Premoli <flaper87@flaper87.org>;\
Scott Lyons <scottalyons@gmail.com>;\
"""
class Channel(virtual.Channel):
_client = None
supports_fanout = True
_fanout_queues = {}
def __init__(self, *vargs, **kwargs):
super_ = super(Channel, self)
super_.__init__(*vargs, **kwargs)
self._queue_cursors = {}
self._queue_readcounts = {}
def _new_queue(self, queue, **kwargs):
pass
def _get(self, queue):
try:
if queue in self._fanout_queues:
msg = next(self._queue_cursors[queue])
self._queue_readcounts[queue] += 1
return loads(msg['payload'])
else:
msg = self.client.command(
'findandmodify', 'messages',
query={'queue': queue},
sort={'_id': pymongo.ASCENDING}, remove=True,
)
except errors.OperationFailure as exc:
if 'No matching object found' in exc.args[0]:
raise Empty()
raise
except StopIteration:
raise Empty()
# 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):
if queue in self._fanout_queues:
return (self._queue_cursors[queue].count() -
self._queue_readcounts[queue])
return self.client.messages.find({'queue': queue}).count()
def _put(self, queue, message, **kwargs):
self.client.messages.insert({'payload': dumps(message),
'queue': queue})
def _purge(self, queue):
size = self._size(queue)
if queue in self._fanout_queues:
cursor = self._queue_cursors[queue]
cursor.rewind()
self._queue_cursors[queue] = cursor.skip(cursor.count())
else:
self.client.messages.remove({'queue': queue})
return size
def close(self):
super(Channel, self).close()
if self._client:
self._client.connection.end_request()
def _open(self):
"""
See mongodb uri documentation:
http://www.mongodb.org/display/DOCS/Connections
"""
conninfo = self.connection.client
dbname = None
hostname = None
if not conninfo.hostname:
conninfo.hostname = DEFAULT_HOST
for part in conninfo.hostname.split('/'):
if not hostname:
hostname = 'mongodb://' + part
continue
dbname = part
if '?' in part:
# In case someone is passing options
# to the mongodb connection. Right now
# it is not permitted by kombu
dbname, options = part.split('?')
hostname += '/?' + options
hostname = "%s/%s" % (
hostname, dbname in [None, "/"] and "admin" or dbname,
)
if not dbname or dbname == "/":
dbname = "kombu_default"
# At this point we expect the hostname to be something like
# (considering replica set form too):
#
# mongodb://[username:password@]host1[:port1][,host2[:port2],
# ...[,hostN[:portN]]][/[?options]]
mongoconn = Connection(host=hostname)
version = mongoconn.server_info()['version']
if tuple(map(int, version.split('.')[:2])) < (1, 3):
raise NotImplementedError(
'Kombu requires MongoDB version 1.3+ (server is {0})'.format(
version))
database = getattr(mongoconn, dbname)
# This is done by the connection uri
# if conninfo.userid:
# database.authenticate(conninfo.userid, conninfo.password)
self.db = database
col = database.messages
col.ensure_index([('queue', 1), ('_id', 1)], background=True)
if 'messages.broadcast' not in database.collection_names():
capsize = conninfo.transport_options.get(
'capped_queue_size') or 100000
database.create_collection('messages.broadcast',
size=capsize, capped=True)
self.bcast = getattr(database, 'messages.broadcast')
self.bcast.ensure_index([('queue', 1)])
self.routing = getattr(database, 'messages.routing')
self.routing.ensure_index([('queue', 1), ('exchange', 1)])
return database
#TODO: Store a more complete exchange metatable in the routing collection
def get_table(self, exchange):
"""Get table of bindings for ``exchange``."""
localRoutes = frozenset(self.state.exchanges[exchange]['table'])
brokerRoutes = self.client.messages.routing.find(
{'exchange': exchange}
)
return localRoutes | frozenset((r['routing_key'],
r['pattern'],
r['queue']) for r in brokerRoutes)
def _put_fanout(self, exchange, message, **kwargs):
"""Deliver fanout message."""
self.client.messages.broadcast.insert({'payload': dumps(message),
'queue': exchange})
def _queue_bind(self, exchange, routing_key, pattern, queue):
if self.typeof(exchange).type == 'fanout':
cursor = self.bcast.find(query={'queue': exchange},
sort=[('$natural', 1)], tailable=True)
# Fast forward the cursor past old events
self._queue_cursors[queue] = cursor.skip(cursor.count())
self._queue_readcounts[queue] = cursor.count()
self._fanout_queues[queue] = exchange
meta = {'exchange': exchange,
'queue': queue,
'routing_key': routing_key,
'pattern': pattern}
self.client.messages.routing.update(meta, meta, upsert=True)
def queue_delete(self, queue, **kwargs):
self.routing.remove({'queue': queue})
super(Channel, self).queue_delete(queue, **kwargs)
if queue in self._fanout_queues:
self._queue_cursors[queue].close()
self._queue_cursors.pop(queue, None)
self._fanout_queues.pop(queue, None)
@property
def client(self):
if self._client is None:
self._client = self._open()
return self._client
class Transport(virtual.Transport):
Channel = Channel
polling_interval = 1
default_port = DEFAULT_PORT
connection_errors = (StdConnectionError, errors.ConnectionFailure)
channel_errors = (StdChannelError,
errors.ConnectionFailure,
errors.OperationFailure)
driver_type = 'mongodb'
driver_name = 'pymongo'
def driver_version(self):
return pymongo.version
|
