x/gantt
Code Issues Proposed changes

Support for several HA RabbitMQ servers.

Browse Source 
Port from openstack-common: https://review.openstack.org/#/c/10305/

Change-Id: Ib44abf115b42c3df42771344f6722ce1db043bbd
This commit is contained in:
Eugene Kirpichov 2012-09-25 20:33:28 +00:00
parent 0a410e71bf
commit 83fa8ce3e8
3 changed files with 141 additions and 39 deletions
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68
nova/openstack/common/network_utils.py Normal file
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@ -0,0 +1,68 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2012 OpenStack LLC.
# All Rights Reserved.
#
# 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.
"""
Network-related utilities and helper functions.
"""
import logging
LOG = logging.getLogger(__name__)
def parse_host_port(address, default_port=None):
"""
Interpret a string as a host:port pair.
An IPv6 address MUST be escaped if accompanied by a port,
because otherwise ambiguity ensues: 2001:db8:85a3::8a2e:370:7334
means both [2001:db8:85a3::8a2e:370:7334] and
[2001:db8:85a3::8a2e:370]:7334.
>>> parse_host_port('server01:80')
('server01', 80)
>>> parse_host_port('server01')
('server01', None)
>>> parse_host_port('server01', default_port=1234)
('server01', 1234)
>>> parse_host_port('[::1]:80')
('::1', 80)
>>> parse_host_port('[::1]')
('::1', None)
>>> parse_host_port('[::1]', default_port=1234)
('::1', 1234)
>>> parse_host_port('2001:db8:85a3::8a2e:370:7334', default_port=1234)
('2001:db8:85a3::8a2e:370:7334', 1234)
"""
if address[0] == '[':
# Escaped ipv6
_host, _port = address[1:].split(']')
host = _host
if ':' in _port:
port = _port.split(':')[1]
else:
port = default_port
else:
if address.count(':') == 1:
host, port = address.split(':')
else:
# 0 means ipv4, >1 means ipv6.
# We prohibit unescaped ipv6 addresses with port.
host = address
port = default_port
return (host, None if port is None else int(port))

110
nova/openstack/common/rpc/impl_kombu.py
View File

@ -33,6 +33,7 @@ from nova.openstack.common import cfg
from nova.openstack.common.gettextutils import _
from nova.openstack.common.rpc import amqp as rpc_amqp
from nova.openstack.common.rpc import common as rpc_common
from nova.openstack.common import network_utils
kombu_opts = [
cfg.StrOpt('kombu_ssl_version',
@ -50,10 +51,13 @@ kombu_opts = [
'(valid only if SSL enabled)')),
cfg.StrOpt('rabbit_host',
default='localhost',
help='the RabbitMQ host'),
help='The RabbitMQ broker address where a single node is used'),
cfg.IntOpt('rabbit_port',
default=5672,
help='the RabbitMQ port'),
help='The RabbitMQ broker port where a single node is used'),
cfg.ListOpt('rabbit_hosts',
default=['$rabbit_host:$rabbit_port'],
help='RabbitMQ HA cluster host:port pairs'),
cfg.BoolOpt('rabbit_use_ssl',
default=False,
help='connect over SSL for RabbitMQ'),
@ -80,6 +84,11 @@ kombu_opts = [
cfg.BoolOpt('rabbit_durable_queues',
default=False,
help='use durable queues in RabbitMQ'),
cfg.BoolOpt('rabbit_ha_queues',
default=False,
help='use H/A queues in RabbitMQ (x-ha-policy: all).'
'You need to wipe RabbitMQ database when '
'changing this option.'),
]
@ -88,6 +97,20 @@ cfg.CONF.register_opts(kombu_opts)
LOG = rpc_common.LOG
def _get_queue_arguments(conf):
"""Construct the arguments for declaring a queue.
If the rabbit_ha_queues option is set, we declare a mirrored queue
as described here:
http://www.rabbitmq.com/ha.html
Setting x-ha-policy to all means that the queue will be mirrored
to all nodes in the cluster.
"""
return {'x-ha-policy': 'all'} if conf.rabbit_ha_queues else {}
class ConsumerBase(object):
"""Consumer base class."""
@ -207,6 +230,7 @@ class TopicConsumer(ConsumerBase):
"""
# Default options
options = {'durable': conf.rabbit_durable_queues,
'queue_arguments': _get_queue_arguments(conf),
'auto_delete': False,
'exclusive': False}
options.update(kwargs)
@ -331,6 +355,7 @@ class NotifyPublisher(TopicPublisher):
def __init__(self, conf, channel, topic, **kwargs):
self.durable = kwargs.pop('durable', conf.rabbit_durable_queues)
self.queue_arguments = _get_queue_arguments(conf)
super(NotifyPublisher, self).__init__(conf, channel, topic, **kwargs)
def reconnect(self, channel):
@ -343,7 +368,8 @@ class NotifyPublisher(TopicPublisher):
exchange=self.exchange,
durable=self.durable,
name=self.routing_key,
routing_key=self.routing_key)
routing_key=self.routing_key,
queue_arguments=self.queue_arguments)
queue.declare()
@ -368,31 +394,37 @@ class Connection(object):
if server_params is None:
server_params = {}
# Keys to translate from server_params to kombu params
server_params_to_kombu_params = {'username': 'userid'}
params = {}
for sp_key, value in server_params.iteritems():
p_key = server_params_to_kombu_params.get(sp_key, sp_key)
params[p_key] = value
ssl_params = self._fetch_ssl_params()
params_list = []
for adr in self.conf.rabbit_hosts:
hostname, port = network_utils.parse_host_port(
adr, default_port=self.conf.rabbit_port)
params.setdefault('hostname', self.conf.rabbit_host)
params.setdefault('port', self.conf.rabbit_port)
params.setdefault('userid', self.conf.rabbit_userid)
params.setdefault('password', self.conf.rabbit_password)
params.setdefault('virtual_host', self.conf.rabbit_virtual_host)
params = {}
self.params = params
for sp_key, value in server_params.iteritems():
p_key = server_params_to_kombu_params.get(sp_key, sp_key)
params[p_key] = value
if self.conf.fake_rabbit:
self.params['transport'] = 'memory'
self.memory_transport = True
else:
self.memory_transport = False
params.setdefault('hostname', hostname)
params.setdefault('port', port)
params.setdefault('userid', self.conf.rabbit_userid)
params.setdefault('password', self.conf.rabbit_password)
params.setdefault('virtual_host', self.conf.rabbit_virtual_host)
if self.conf.rabbit_use_ssl:
self.params['ssl'] = self._fetch_ssl_params()
if self.conf.fake_rabbit:
params['transport'] = 'memory'
if self.conf.rabbit_use_ssl:
params['ssl'] = ssl_params
params_list.append(params)
self.params_list = params_list
self.memory_transport = self.conf.fake_rabbit
self.connection = None
self.reconnect()
@ -422,14 +454,14 @@ class Connection(object):
# Return the extended behavior
return ssl_params
def _connect(self):
def _connect(self, params):
"""Connect to rabbit. Re-establish any queues that may have
been declared before if we are reconnecting. Exceptions should
be handled by the caller.
"""
if self.connection:
LOG.info(_("Reconnecting to AMQP server on "
"%(hostname)s:%(port)d") % self.params)
"%(hostname)s:%(port)d") % params)
try:
self.connection.close()
except self.connection_errors:
@ -437,7 +469,7 @@ class Connection(object):
# Setting this in case the next statement fails, though
# it shouldn't be doing any network operations, yet.
self.connection = None
self.connection = kombu.connection.BrokerConnection(**self.params)
self.connection = kombu.connection.BrokerConnection(**params)
self.connection_errors = self.connection.connection_errors
if self.memory_transport:
# Kludge to speed up tests.
@ -450,8 +482,8 @@ class Connection(object):
self.channel._new_queue('ae.undeliver')
for consumer in self.consumers:
consumer.reconnect(self.channel)
LOG.info(_('Connected to AMQP server on %(hostname)s:%(port)d'),
self.params)
LOG.info(_('Connected to AMQP server on %(hostname)s:%(port)d') %
params)
def reconnect(self):
"""Handles reconnecting and re-establishing queues.
@ -464,11 +496,12 @@ class Connection(object):
attempt = 0
while True:
params = self.params_list[attempt % len(self.params_list)]
attempt += 1
try:
self._connect()
self._connect(params)
return
except (self.connection_errors, IOError), e:
except (IOError, self.connection_errors) as e:
pass
except Exception, e:
# NOTE(comstud): Unfortunately it's possible for amqplib
@ -483,12 +516,12 @@ class Connection(object):
log_info = {}
log_info['err_str'] = str(e)
log_info['max_retries'] = self.max_retries
log_info.update(self.params)
log_info.update(params)
if self.max_retries and attempt == self.max_retries:
LOG.exception(_('Unable to connect to AMQP server on '
'%(hostname)s:%(port)d after %(max_retries)d '
'tries: %(err_str)s') % log_info)
LOG.error(_('Unable to connect to AMQP server on '
'%(hostname)s:%(port)d after %(max_retries)d '
'tries: %(err_str)s') % log_info)
# NOTE(comstud): Copied from original code. There's
# really no better recourse because if this was a queue we
# need to consume on, we have no way to consume anymore.
@ -502,9 +535,9 @@ class Connection(object):
sleep_time = min(sleep_time, self.interval_max)
log_info['sleep_time'] = sleep_time
LOG.exception(_('AMQP server on %(hostname)s:%(port)d is'
' unreachable: %(err_str)s. Trying again in '
'%(sleep_time)d seconds.') % log_info)
LOG.error(_('AMQP server on %(hostname)s:%(port)d is '
'unreachable: %(err_str)s. Trying again in '
'%(sleep_time)d seconds.') % log_info)
time.sleep(sleep_time)
def ensure(self, error_callback, method, *args, **kwargs):
@ -512,7 +545,8 @@ class Connection(object):
try:
return method(*args, **kwargs)
except (self.connection_errors, socket.timeout, IOError), e:
pass
if error_callback:
error_callback(e)
except Exception, e:
# NOTE(comstud): Unfortunately it's possible for amqplib
# to return an error not covered by its transport
@ -522,8 +556,8 @@ class Connection(object):
# and try to reconnect in this case.
if 'timeout' not in str(e):
raise
if error_callback:
error_callback(e)
if error_callback:
error_callback(e)
self.reconnect()
def get_channel(self):

2
openstack-common.conf
View File

@ -1,7 +1,7 @@
[DEFAULT]
# The list of modules to copy from openstack-common
modules=cfg,context,excutils,gettextutils,importutils,iniparser,jsonutils,local,log,notifier,plugin,policy,setup,timeutils,rpc
modules=cfg,context,excutils,gettextutils,importutils,iniparser,jsonutils,local,log,network_utils,notifier,plugin,policy,setup,timeutils,rpc
# The base module to hold the copy of openstack.common
base=nova