1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
"""
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 kombu.exceptions import StdConnectionError, StdChannelError
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 = self._queue_cursors[queue].next()
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, 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
"""
client = self.connection.client
hostname = client.hostname or DEFAULT_HOST
authdb = dbname = client.virtual_host
if dbname in ["/", None]:
dbname = "kombu_default"
authdb = "admin"
if not client.userid:
hostname = hostname.replace('/' + client.virtual_host, '/')
else:
hostname = hostname.replace('/' + client.virtual_host,
'/' + authdb)
mongo_uri = 'mongodb://' + hostname
# 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=mongo_uri, ssl=client.ssl)
database = getattr(mongoconn, dbname)
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, ))
self.db = database
col = database.messages
col.ensure_index([('queue', 1), ('_id', 1)], background=True)
if 'messages.broadcast' not in database.collection_names():
capsize = (client.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
|
