282cbc222e
This patch proposes to allow TransportURLs to have query parameters with driver-specific options which may override corresponding values from a static configuration. As an example, the patch implements this possibility in the pika driver. If the idea is approved, it will be possible to also implement it in the other drivers. Change-Id: Ibb7e13b4509fde035a3c334cde9bc4c498f92140
463 lines
16 KiB
Python
463 lines
16 KiB
Python
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# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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# Copyright 2013 Red Hat, Inc.
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# Copyright (c) 2012 Rackspace Hosting
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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__all__ = [
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'DriverLoadFailure',
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'InvalidTransportURL',
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'Transport',
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'TransportHost',
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'TransportURL',
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'get_transport',
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'set_transport_defaults',
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]
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import logging
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from oslo_config import cfg
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import six
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from six.moves.urllib import parse
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from stevedore import driver
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from oslo_messaging import exceptions
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LOG = logging.getLogger(__name__)
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_transport_opts = [
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cfg.StrOpt('transport_url',
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secret=True,
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help='A URL representing the messaging driver to use and its '
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'full configuration.'),
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cfg.StrOpt('rpc_backend',
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deprecated_for_removal=True,
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deprecated_reason="Replaced by [DEFAULT]/transport_url",
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default='rabbit',
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help='The messaging driver to use, defaults to rabbit. Other '
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'drivers include amqp and zmq.'),
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cfg.StrOpt('control_exchange',
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default='openstack',
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help='The default exchange under which topics are scoped. May '
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'be overridden by an exchange name specified in the '
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'transport_url option.'),
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]
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def set_transport_defaults(control_exchange):
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"""Set defaults for messaging transport configuration options.
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:param control_exchange: the default exchange under which topics are scoped
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:type control_exchange: str
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"""
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cfg.set_defaults(_transport_opts,
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control_exchange=control_exchange)
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class Transport(object):
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"""A messaging transport.
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This is a mostly opaque handle for an underlying messaging transport
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driver.
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It has a single 'conf' property which is the cfg.ConfigOpts instance used
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to construct the transport object.
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"""
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def __init__(self, driver):
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self.conf = driver.conf
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self._driver = driver
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def _require_driver_features(self, requeue=False):
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self._driver.require_features(requeue=requeue)
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def _send(self, target, ctxt, message, wait_for_reply=None, timeout=None,
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retry=None):
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if not target.topic:
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raise exceptions.InvalidTarget('A topic is required to send',
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target)
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return self._driver.send(target, ctxt, message,
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wait_for_reply=wait_for_reply,
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timeout=timeout, retry=retry)
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def _send_notification(self, target, ctxt, message, version, retry=None):
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if not target.topic:
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raise exceptions.InvalidTarget('A topic is required to send',
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target)
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self._driver.send_notification(target, ctxt, message, version,
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retry=retry)
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def _listen(self, target, batch_size, batch_timeout):
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if not (target.topic and target.server):
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raise exceptions.InvalidTarget('A server\'s target must have '
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'topic and server names specified',
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target)
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return self._driver.listen(target, batch_size,
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batch_timeout)
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def _listen_for_notifications(self, targets_and_priorities, pool,
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batch_size, batch_timeout):
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for target, priority in targets_and_priorities:
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if not target.topic:
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raise exceptions.InvalidTarget('A target must have '
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'topic specified',
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target)
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return self._driver.listen_for_notifications(
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targets_and_priorities, pool, batch_size, batch_timeout
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)
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def cleanup(self):
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"""Release all resources associated with this transport."""
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self._driver.cleanup()
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class InvalidTransportURL(exceptions.MessagingException):
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"""Raised if transport URL is invalid."""
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def __init__(self, url, msg):
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super(InvalidTransportURL, self).__init__(msg)
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self.url = url
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class DriverLoadFailure(exceptions.MessagingException):
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"""Raised if a transport driver can't be loaded."""
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def __init__(self, driver, ex):
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msg = 'Failed to load transport driver "%s": %s' % (driver, ex)
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super(DriverLoadFailure, self).__init__(msg)
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self.driver = driver
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self.ex = ex
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def get_transport(conf, url=None, allowed_remote_exmods=None, aliases=None):
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"""A factory method for Transport objects.
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This method will construct a Transport object from transport configuration
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gleaned from the user's configuration and, optionally, a transport URL.
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If a transport URL is supplied as a parameter, any transport configuration
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contained in it takes precedence. If no transport URL is supplied, but
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there is a transport URL supplied in the user's configuration then that
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URL will take the place of the URL parameter. In both cases, any
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configuration not supplied in the transport URL may be taken from
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individual configuration parameters in the user's configuration.
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An example transport URL might be::
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rabbit://me:passwd@host:5672/virtual_host
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and can either be passed as a string or a TransportURL object.
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:param conf: the user configuration
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:type conf: cfg.ConfigOpts
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:param url: a transport URL
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:type url: str or TransportURL
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:param allowed_remote_exmods: a list of modules which a client using this
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transport will deserialize remote exceptions
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from
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:type allowed_remote_exmods: list
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:param aliases: A map of transport alias to transport name
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:type aliases: dict
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"""
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allowed_remote_exmods = allowed_remote_exmods or []
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conf.register_opts(_transport_opts)
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if not isinstance(url, TransportURL):
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url = TransportURL.parse(conf, url, aliases)
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kwargs = dict(default_exchange=conf.control_exchange,
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allowed_remote_exmods=allowed_remote_exmods)
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try:
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mgr = driver.DriverManager('oslo.messaging.drivers',
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url.transport.split('+')[0],
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invoke_on_load=True,
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invoke_args=[conf, url],
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invoke_kwds=kwargs)
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except RuntimeError as ex:
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raise DriverLoadFailure(url.transport, ex)
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return Transport(mgr.driver)
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class TransportHost(object):
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"""A host element of a parsed transport URL."""
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def __init__(self, hostname=None, port=None, username=None, password=None):
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self.hostname = hostname
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self.port = port
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self.username = username
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self.password = password
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def __hash__(self):
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return hash((self.hostname, self.port, self.username, self.password))
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def __eq__(self, other):
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return vars(self) == vars(other)
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def __ne__(self, other):
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return not self == other
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def __repr__(self):
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attrs = []
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for a in ['hostname', 'port', 'username', 'password']:
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v = getattr(self, a)
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if v:
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attrs.append((a, repr(v)))
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values = ', '.join(['%s=%s' % i for i in attrs])
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return '<TransportHost ' + values + '>'
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class TransportURL(object):
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"""A parsed transport URL.
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Transport URLs take the form::
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transport://user:pass@host:port[,userN:passN@hostN:portN]/virtual_host?query
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i.e. the scheme selects the transport driver, you may include multiple
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hosts in netloc, the path part is a "virtual host" partition path and
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the query part contains some driver-specific options which may override
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corresponding values from a static configuration.
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:param conf: a ConfigOpts instance
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:type conf: oslo.config.cfg.ConfigOpts
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:param transport: a transport name for example 'rabbit'
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:type transport: str
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:param virtual_host: a virtual host path for example '/'
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:type virtual_host: str
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:param hosts: a list of TransportHost objects
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:type hosts: list
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:param aliases: DEPRECATED: a map of transport alias to transport name
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:type aliases: dict
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:param query: a dictionary of URL query parameters
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:type query: dict
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"""
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def __init__(self, conf, transport=None, virtual_host=None, hosts=None,
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aliases=None, query=None):
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self.conf = conf
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self.conf.register_opts(_transport_opts)
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self._transport = transport
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self.virtual_host = virtual_host
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if hosts is None:
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self.hosts = []
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else:
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self.hosts = hosts
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if aliases is None:
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self.aliases = {}
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else:
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self.aliases = aliases
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if query is None:
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self.query = {}
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else:
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self.query = query
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self._deprecation_logged = False
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@property
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def transport(self):
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if self._transport is None:
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transport = self.conf.rpc_backend
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else:
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transport = self._transport
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final_transport = self.aliases.get(transport, transport)
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if not self._deprecation_logged and final_transport != transport:
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# NOTE(sileht): The first step is deprecate this one cycle.
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# To ensure deployer have updated they configuration during Octavia
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# Then in P we will deprecate aliases kwargs of TransportURL() and
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# get_transport() for consuming application
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LOG.warning('legacy "rpc_backend" is deprecated, '
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'"%(legacy_transport)s" must be replaced by '
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'"%(final_transport)s"' % {
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'legacy_transport': transport,
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'final_transport': final_transport})
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self._deprecation_logged = True
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return final_transport
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@transport.setter
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def transport(self, value):
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self._transport = value
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def __hash__(self):
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return hash((tuple(self.hosts), self.transport, self.virtual_host))
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def __eq__(self, other):
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return (self.transport == other.transport and
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self.virtual_host == other.virtual_host and
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self.hosts == other.hosts)
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def __ne__(self, other):
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return not self == other
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def __repr__(self):
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attrs = []
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for a in ['transport', 'virtual_host', 'hosts']:
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v = getattr(self, a)
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if v:
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attrs.append((a, repr(v)))
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values = ', '.join(['%s=%s' % i for i in attrs])
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return '<TransportURL ' + values + '>'
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def __str__(self):
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netlocs = []
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for host in self.hosts:
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username = host.username
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password = host.password
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hostname = host.hostname
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port = host.port
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# Starting place for the network location
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netloc = ''
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# Build the username and password portion of the transport URL
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if username is not None or password is not None:
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if username is not None:
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netloc += parse.quote(username, '')
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if password is not None:
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netloc += ':%s' % parse.quote(password, '')
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netloc += '@'
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# Build the network location portion of the transport URL
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if hostname:
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if ':' in hostname:
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netloc += '[%s]' % hostname
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else:
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netloc += hostname
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if port is not None:
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netloc += ':%d' % port
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netlocs.append(netloc)
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# Assemble the transport URL
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url = '%s://%s/' % (self.transport, ','.join(netlocs))
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if self.virtual_host:
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url += parse.quote(self.virtual_host)
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if self.query:
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url += '?' + parse.urlencode(self.query, doseq=True)
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return url
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@classmethod
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def parse(cls, conf, url=None, aliases=None):
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"""Parse an url.
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Assuming a URL takes the form of::
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transport://user:pass@host:port[,userN:passN@hostN:portN]/virtual_host?query
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then parse the URL and return a TransportURL object.
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Netloc is parsed following the sequence bellow:
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* It is first split by ',' in order to support multiple hosts
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* Username and password should be specified for each host, in
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case of lack of specification they will be omitted::
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user:pass@host1:port1,host2:port2
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[
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{"username": "user", "password": "pass", "host": "host1:port1"},
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{"host": "host2:port2"}
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]
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If the url is not provided conf.transport_url is parsed instead.
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:param conf: a ConfigOpts instance
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:type conf: oslo.config.cfg.ConfigOpts
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:param url: The URL to parse
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:type url: str
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:param aliases: A map of transport alias to transport name
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:type aliases: dict
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:returns: A TransportURL
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"""
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url = url or conf.transport_url
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if not url:
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return cls(conf, aliases=aliases)
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if not isinstance(url, six.string_types):
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raise InvalidTransportURL(url, 'Wrong URL type')
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url = parse.urlparse(url)
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if not url.scheme:
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raise InvalidTransportURL(url.geturl(), 'No scheme specified')
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transport = url.scheme
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query = {}
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if url.query:
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for key, values in six.iteritems(parse.parse_qs(url.query)):
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query[key] = ','.join(values)
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virtual_host = None
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if url.path.startswith('/'):
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virtual_host = parse.unquote(url.path[1:])
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hosts = []
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for host in url.netloc.split(','):
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if not host:
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continue
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hostname = host
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username = password = port = None
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if '@' in host:
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username, hostname = host.split('@', 1)
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if ':' in username:
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username, password = username.split(':', 1)
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password = parse.unquote(password)
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username = parse.unquote(username)
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if not hostname:
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hostname = None
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elif hostname.startswith('['):
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# Find the closing ']' and extract the hostname
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host_end = hostname.find(']')
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if host_end < 0:
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# NOTE(Vek): Identical to what Python 2.7's
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# urlparse.urlparse() raises in this case
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raise ValueError('Invalid IPv6 URL')
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port_text = hostname[host_end:]
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hostname = hostname[1:host_end]
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# Now we need the port; this is compliant with how urlparse
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# parses the port data
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port = None
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if ':' in port_text:
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port = int(port_text.split(':', 1)[1])
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elif ':' in hostname:
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hostname, port = hostname.split(':', 1)
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port = int(port)
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hosts.append(TransportHost(hostname=hostname,
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port=port,
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username=username,
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password=password))
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return cls(conf, transport, virtual_host, hosts, aliases, query)
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