6ad30a39e6
* Removed all log translation. * Always lazy-load logging. * Fixed broken log lines and updated tests. Logs should no longer be translated (starting with Pike)[1]. Also, according to OpenStack Guideline[2], logged string message should be interpolated by the logger. [1]: http://lists.openstack.org/pipermail/openstack-dev/2017-March/thread.html#113365 [2]: https://docs.openstack.org/oslo.i18n/latest/user/guidelines.html#adding-variables-to-log-messages Change-Id: I07825694f173a8bebd7d62ade089c38d3c666283
187 lines
6.5 KiB
Python
187 lines
6.5 KiB
Python
# Copyright 2014 Rackspace Inc.
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#
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# Author: Tim Simmons <tim.simmons@rackspace.com>
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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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"""
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backend.agent
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~~~~~~~~~~~~~
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Agent backend for Pool Manager.
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Sends DNS requests to a remote agent using private OPCODEs to trigger
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creation / deletion / update of zones.
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Configured in the [service:pool_manager] section
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"""
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import eventlet
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import dns
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import dns.rdataclass
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import dns.rdatatype
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import dns.exception
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import dns.flags
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import dns.rcode
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import dns.message
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import dns.opcode
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from oslo_config import cfg
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from oslo_log import log as logging
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from designate.backend import base
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from designate import exceptions
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from designate.mdns import rpcapi as mdns_api
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from designate.utils import DEFAULT_AGENT_PORT
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import designate.backend.private_codes as pcodes
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dns_query = eventlet.import_patched('dns.query')
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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class AgentPoolBackend(base.Backend):
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__plugin_name__ = 'agent'
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__backend_status__ = 'untested'
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def __init__(self, target):
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super(AgentPoolBackend, self).__init__(target)
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self.host = self.options.get('host', '127.0.0.1')
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self.port = int(self.options.get('port', DEFAULT_AGENT_PORT))
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self.timeout = CONF['service:pool_manager'].poll_timeout
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self.retry_interval = CONF['service:pool_manager'].poll_retry_interval
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self.max_retries = CONF['service:pool_manager'].poll_max_retries
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# FIXME: the agent retries creating zones without any interval
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@property
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def mdns_api(self):
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return mdns_api.MdnsAPI.get_instance()
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def create_zone(self, context, zone):
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LOG.debug('Create Zone')
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response, retry = self._make_and_send_dns_message(
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zone.name,
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self.timeout,
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pcodes.CC,
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pcodes.CREATE,
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pcodes.CLASSCC,
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self.host,
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self.port
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)
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if response is None:
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raise exceptions.Backend("create_zone() failed")
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def update_zone(self, context, zone):
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LOG.debug('Update Zone')
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self.mdns_api.notify_zone_changed(
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context,
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zone,
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self.host,
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self.port,
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self.timeout,
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self.retry_interval,
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self.max_retries,
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self.delay
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)
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def delete_zone(self, context, zone):
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LOG.debug('Delete Zone')
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response, retry = self._make_and_send_dns_message(
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zone.name,
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self.timeout,
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pcodes.CC,
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pcodes.DELETE,
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pcodes.CLASSCC,
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self.host,
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self.port
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)
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if response is None:
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raise exceptions.Backend("failed delete_zone()")
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def _make_and_send_dns_message(self, zone_name, timeout, opcode,
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rdatatype, rdclass, dest_ip,
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dest_port):
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dns_message = self._make_dns_message(zone_name, opcode, rdatatype,
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rdclass)
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retry = 0
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response = None
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LOG.info("Sending '%(msg)s' for '%(zone)s' to '%(server)s:%(port)d'.",
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{'msg': str(opcode),
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'zone': zone_name, 'server': dest_ip,
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'port': dest_port})
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response = self._send_dns_message(
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dns_message, dest_ip, dest_port, timeout)
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if isinstance(response, dns.exception.Timeout):
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LOG.warning("Got Timeout while trying to send '%(msg)s' for "
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"'%(zone)s' to '%(server)s:%(port)d'. "
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"Timeout='%(timeout)d' seconds. Retry='%(retry)d'",
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{'msg': str(opcode),
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'zone': zone_name, 'server': dest_ip,
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'port': dest_port, 'timeout': timeout,
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'retry': retry})
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response = None
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elif isinstance(response, dns_query.BadResponse):
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LOG.warning("Got BadResponse while trying to send '%(msg)s' for "
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"'%(zone)s' to '%(server)s:%(port)d'. "
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"Timeout='%(timeout)d' seconds. Retry='%(retry)d'",
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{'msg': str(opcode),
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'zone': zone_name, 'server': dest_ip,
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'port': dest_port, 'timeout': timeout,
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'retry': retry})
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response = None
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return (response, retry)
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# Check that we actually got a NOERROR in the rcode and and an
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# authoritative answer
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elif not (response.flags & dns.flags.AA) or dns.rcode.from_flags(
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response.flags, response.ednsflags) != dns.rcode.NOERROR:
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LOG.warning("Failed to get expected response while trying to "
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"send '%(msg)s' for '%(zone)s' to "
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"'%(server)s:%(port)d'. Response message: %(resp)s",
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{'msg': str(opcode),
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'zone': zone_name, 'server': dest_ip,
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'port': dest_port, 'resp': str(response)})
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response = None
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return (response, retry)
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else:
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return (response, retry)
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return (response, retry)
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def _make_dns_message(self, zone_name, opcode, rdatatype, rdclass):
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dns_message = dns.message.make_query(zone_name, rdatatype,
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rdclass=rdclass)
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dns_message.flags = 0
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dns_message.set_opcode(opcode)
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dns_message.flags |= dns.flags.AA
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return dns_message
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def _send_dns_message(self, dns_message, dest_ip, dest_port, timeout):
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try:
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if not CONF['service:mdns'].all_tcp:
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response = dns_query.udp(
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dns_message, dest_ip, port=dest_port, timeout=timeout)
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else:
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response = dns_query.tcp(
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dns_message, dest_ip, port=dest_port, timeout=timeout)
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return response
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except dns.exception.Timeout as timeout:
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return timeout
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except dns_query.BadResponse as badResponse:
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return badResponse
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