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# Copyright 2016 Hewlett Packard Enterprise Development Company LP
#
# 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.
import abc
from oslo_log import log as logging
from oslo_utils import timeutils
import designate.conf
from designate import context
from designate import objects
from designate import plugin
from designate.central import rpcapi as central_rpcapi
CONF = designate.conf.CONF
LOG = logging.getLogger(__name__)
class HeartBeatEmitter(plugin.DriverPlugin):
__plugin_ns__ = 'designate.heartbeat_emitter'
__plugin_type__ = 'heartbeat_emitter'
def __init__(self, service, threadgroup, status_factory=None):
super(HeartBeatEmitter, self).__init__()
self._service = service
self._hostname = CONF.host
self._running = False
self._tg = threadgroup
self._tg.add_timer(
CONF.heartbeat_emitter.heartbeat_interval,
self._emit_heartbeat)
self._status_factory = status_factory
def _get_status(self):
if self._status_factory is not None:
return self._status_factory()
return True, {}, {}
def _emit_heartbeat(self):
"""
Returns Status, Stats, Capabilities
"""
if not self._running:
return
status, stats, capabilities = self._get_status()
service_status = objects.ServiceStatus(
service_name=self._service,
hostname=self._hostname,
status=status,
stats=stats,
capabilities=capabilities,
heartbeated_at=timeutils.utcnow()
)
LOG.trace("Emitting %s", service_status)
self._transmit(service_status)
@abc.abstractmethod
def _transmit(self, status):
pass
def start(self):
self._running = True
def stop(self):
self._running = False
class NoopEmitter(HeartBeatEmitter):
__plugin_name__ = 'noop'
def _transmit(self, status):
LOG.debug(status)
class RpcEmitter(HeartBeatEmitter):
__plugin_name__ = 'rpc'
def __init__(self, service, thread_group, rpc_api=None, *args, **kwargs):
super(RpcEmitter, self).__init__(
service, thread_group, *args, **kwargs)
self.rpc_api = rpc_api
def _transmit(self, status):
admin_context = context.DesignateContext.get_admin_context()
api = self.rpc_api or central_rpcapi.CentralAPI.get_instance()
api.update_service_status(admin_context, status)
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