136 lines
3.9 KiB
Python
136 lines
3.9 KiB
Python
# Copyright(c) 2016 Nippon Telegraph and Telephone Corporation
|
|
#
|
|
# 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.
|
|
|
|
"""Generic Node base class for all workers that run on hosts."""
|
|
|
|
import os
|
|
import sys
|
|
|
|
from oslo_log import log as logging
|
|
from oslo_service import service
|
|
from oslo_utils import importutils
|
|
|
|
import masakarimonitors.conf
|
|
from masakarimonitors.i18n import _
|
|
from masakarimonitors import utils
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
CONF = masakarimonitors.conf.CONF
|
|
|
|
|
|
class Service(service.Service):
|
|
"""Service object for binaries running on hosts.
|
|
|
|
A service takes a manager.
|
|
"""
|
|
|
|
def __init__(self, host, binary, manager):
|
|
super(Service, self).__init__()
|
|
self.host = host
|
|
self.binary = binary
|
|
self.manager_class_name = manager
|
|
manager_class = importutils.import_class(self.manager_class_name)
|
|
self.manager = manager_class(host=self.host)
|
|
|
|
def __repr__(self):
|
|
return "<%(cls_name)s: host=%(host)s, binary=%(binary)s, " \
|
|
"manager_class_name=%(manager)s>" %\
|
|
{
|
|
'cls_name': self.__class__.__name__,
|
|
'host': self.host,
|
|
'binary': self.binary,
|
|
'manager': self.manager_class_name
|
|
}
|
|
|
|
def start(self):
|
|
LOG.info('Starting %s', self.binary)
|
|
self.basic_config_check()
|
|
self.manager.init_host()
|
|
self.manager.main()
|
|
|
|
def __getattr__(self, key):
|
|
manager = self.__dict__.get('manager', None)
|
|
return getattr(manager, key)
|
|
|
|
@classmethod
|
|
def create(cls, host=None, binary=None, manager=None):
|
|
"""Instantiates class and passes back application object.
|
|
|
|
:param host: defaults to CONF.hostname
|
|
:param binary: defaults to basename of executable
|
|
:param manager: defaults to CONF.<Latter part of binary>_manager
|
|
|
|
"""
|
|
if not host:
|
|
host = CONF.hostname
|
|
if not binary:
|
|
binary = os.path.basename(sys.argv[0])
|
|
|
|
if not manager:
|
|
manager_cls = ('%s_manager' %
|
|
binary.rpartition('masakarimonitors-')[2])
|
|
manager = CONF.get(manager_cls, None)
|
|
|
|
service_obj = cls(host, binary, manager)
|
|
|
|
return service_obj
|
|
|
|
def kill(self):
|
|
"""Destroy the service object in the datastore.
|
|
|
|
NOTE: Although this method is not used anywhere else than tests, it is
|
|
convenient to have it here, so the tests might easily and in clean way
|
|
stop and remove the service_ref.
|
|
|
|
"""
|
|
self.stop()
|
|
|
|
def stop(self):
|
|
LOG.info('Stopping %s', self.binary)
|
|
self.manager.stop()
|
|
super(Service, self).stop()
|
|
|
|
def basic_config_check(self):
|
|
"""Perform basic config checks before starting processing."""
|
|
# Make sure the tempdir exists and is writable
|
|
try:
|
|
with utils.tempdir():
|
|
pass
|
|
except Exception as e:
|
|
LOG.error('Temporary directory is invalid: %s', e)
|
|
sys.exit(1)
|
|
|
|
def reset(self):
|
|
self.manager.reset()
|
|
|
|
|
|
# NOTE: the global launcher is to maintain the existing
|
|
# functionality of calling service.serve +
|
|
# service.wait
|
|
_launcher = None
|
|
|
|
|
|
def serve(server, workers=None):
|
|
global _launcher
|
|
if _launcher:
|
|
raise RuntimeError(_('serve() can only be called once'))
|
|
|
|
_launcher = service.launch(CONF, server, workers=workers)
|
|
|
|
|
|
def wait():
|
|
_launcher.wait()
|