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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright [2010] [Anso Labs, LLC]
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
AMQP-based RPC. Queues have consumers and publishers.
No fan-out support yet.
"""
import logging
import sys
import uuid
from nova import vendor
import anyjson
from carrot import connection
from carrot import messaging
from twisted.internet import defer
from twisted.internet import reactor
from twisted.internet import task
from nova import fakerabbit
from nova import flags
FLAGS = flags.FLAGS
_log = logging.getLogger('amqplib')
_log.setLevel(logging.WARN)
class Connection(connection.BrokerConnection):
@classmethod
def instance(cls):
if not hasattr(cls, '_instance'):
params = dict(hostname=FLAGS.rabbit_host,
port=FLAGS.rabbit_port,
userid=FLAGS.rabbit_userid,
password=FLAGS.rabbit_password,
virtual_host=FLAGS.rabbit_virtual_host)
if FLAGS.fake_rabbit:
params['backend_cls'] = fakerabbit.Backend
cls._instance = cls(**params)
return cls._instance
class Consumer(messaging.Consumer):
# TODO(termie): it would be nice to give these some way of automatically
# cleaning up after themselves
def attach_to_tornado(self, io_inst=None):
from tornado import ioloop
if io_inst is None:
io_inst = ioloop.IOLoop.instance()
injected = ioloop.PeriodicCallback(
lambda: self.fetch(enable_callbacks=True), 1, io_loop=io_inst)
injected.start()
return injected
attachToTornado = attach_to_tornado
def attach_to_twisted(self):
loop = task.LoopingCall(self.fetch, enable_callbacks=True)
loop.start(interval=0.001)
class Publisher(messaging.Publisher):
pass
class TopicConsumer(Consumer):
exchange_type = "topic"
def __init__(self, connection=None, topic="broadcast"):
self.queue = topic
self.routing_key = topic
self.exchange = FLAGS.control_exchange
super(TopicConsumer, self).__init__(connection=connection)
class AdapterConsumer(TopicConsumer):
def __init__(self, connection=None, topic="broadcast", proxy=None):
_log.debug('Initing the Adapter Consumer for %s' % (topic))
self.proxy = proxy
super(AdapterConsumer, self).__init__(connection=connection, topic=topic)
def receive(self, message_data, message):
_log.debug('received %s' % (message_data))
msg_id = message_data.pop('_msg_id', None)
method = message_data.get('method')
args = message_data.get('args', {})
if not method:
return
node_func = getattr(self.proxy, str(method))
node_args = dict((str(k), v) for k, v in args.iteritems())
d = defer.maybeDeferred(node_func, **node_args)
if msg_id:
d.addCallback(lambda rval: msg_reply(msg_id, rval))
d.addErrback(lambda e: msg_reply(msg_id, str(e)))
message.ack()
return
class TopicPublisher(Publisher):
exchange_type = "topic"
def __init__(self, connection=None, topic="broadcast"):
self.routing_key = topic
self.exchange = FLAGS.control_exchange
super(TopicPublisher, self).__init__(connection=connection)
class DirectConsumer(Consumer):
exchange_type = "direct"
def __init__(self, connection=None, msg_id=None):
self.queue = msg_id
self.routing_key = msg_id
self.exchange = msg_id
self.auto_delete = True
super(DirectConsumer, self).__init__(connection=connection)
class DirectPublisher(Publisher):
exchange_type = "direct"
def __init__(self, connection=None, msg_id=None):
self.routing_key = msg_id
self.exchange = msg_id
self.auto_delete = True
super(DirectPublisher, self).__init__(connection=connection)
def msg_reply(msg_id, reply):
conn = Connection.instance()
publisher = DirectPublisher(connection=conn, msg_id=msg_id)
try:
publisher.send({'result': reply})
except TypeError:
publisher.send(
{'result': dict((k, repr(v))
for k, v in reply.__dict__.iteritems())
})
publisher.close()
def call(topic, msg):
_log.debug("Making asynchronous call...")
msg_id = uuid.uuid4().hex
msg.update({'_msg_id': msg_id})
_log.debug("MSG_ID is %s" % (msg_id))
conn = Connection.instance()
d = defer.Deferred()
consumer = DirectConsumer(connection=conn, msg_id=msg_id)
consumer.register_callback(lambda data, message: d.callback(data))
injected = consumer.attach_to_tornado()
# clean up after the injected listened and return x
d.addCallback(lambda x: injected.stop() and x or x)
publisher = TopicPublisher(connection=conn, topic=topic)
publisher.send(msg)
publisher.close()
return d
def cast(topic, msg):
_log.debug("Making asynchronous cast...")
conn = Connection.instance()
publisher = TopicPublisher(connection=conn, topic=topic)
publisher.send(msg)
publisher.close()
def generic_response(message_data, message):
_log.debug('response %s', message_data)
message.ack()
sys.exit(0)
def send_message(topic, message, wait=True):
msg_id = uuid.uuid4().hex
message.update({'_msg_id': msg_id})
_log.debug('topic is %s', topic)
_log.debug('message %s', message)
if wait:
consumer = messaging.Consumer(connection=rpc.Connection.instance(),
queue=msg_id,
exchange=msg_id,
auto_delete=True,
exchange_type="direct",
routing_key=msg_id)
consumer.register_callback(generic_response)
publisher = messaging.Publisher(connection=rpc.Connection.instance(),
exchange="nova",
exchange_type="topic",
routing_key=topic)
publisher.send(message)
publisher.close()
if wait:
consumer.wait()
# TODO: Replace with a docstring test
if __name__ == "__main__":
send_message(sys.argv[1], anyjson.deserialize(sys.argv[2]))
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