3a987d0186
Removed unnecessary methods from masakarimonitors/service.py. Change-Id: Id412a492646b072f28467f8e576432bff308fee0
122 lines
3.6 KiB
Python
122 lines
3.6 KiB
Python
# Copyright(c) 2016 Nippon Telegraph and Telephone Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Generic Node base class for all workers that run on hosts."""
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import os
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import sys
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from oslo_log import log as logging
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from oslo_service import service
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from oslo_utils import importutils
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import masakarimonitors.conf
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from masakarimonitors.i18n import _LE
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from masakarimonitors.i18n import _LI
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from masakarimonitors import utils
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LOG = logging.getLogger(__name__)
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CONF = masakarimonitors.conf.CONF
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class Service(service.Service):
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"""Service object for binaries running on hosts.
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A service takes a manager.
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"""
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def __init__(self, host, binary, manager):
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super(Service, self).__init__()
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self.host = host
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self.binary = binary
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self.manager_class_name = manager
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manager_class = importutils.import_class(self.manager_class_name)
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self.manager = manager_class(host=self.host)
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def __repr__(self):
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return "<%(cls_name)s: host=%(host)s, binary=%(binary)s, " \
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"manager_class_name=%(manager)s>" %\
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{
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'cls_name': self.__class__.__name__,
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'host': self.host,
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'binary': self.binary,
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'manager': self.manager_class_name
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}
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def start(self):
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LOG.info(_LI('Starting %s'), self.binary)
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self.basic_config_check()
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self.manager.init_host()
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self.manager.main()
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def __getattr__(self, key):
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manager = self.__dict__.get('manager', None)
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return getattr(manager, key)
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@classmethod
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def create(cls, host=None, binary=None, manager=None):
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"""Instantiates class and passes back application object.
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:param host: defaults to CONF.host
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:param binary: defaults to basename of executable
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:param manager: defaults to CONF.<Latter part of binary>_manager
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"""
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if not host:
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host = CONF.host
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if not binary:
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binary = os.path.basename(sys.argv[0])
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if not manager:
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manager_cls = ('%s_manager' %
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binary.rpartition('masakarimonitors-')[2])
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manager = CONF.get(manager_cls, None)
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service_obj = cls(host, binary, manager)
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return service_obj
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def kill(self):
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"""Destroy the service object in the datastore.
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NOTE: Although this method is not used anywhere else than tests, it is
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convenient to have it here, so the tests might easily and in clean way
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stop and remove the service_ref.
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"""
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self.stop()
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def stop(self):
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LOG.info(_LI('Stopping %s'), self.binary)
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super(Service, self).stop()
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def basic_config_check(self):
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"""Perform basic config checks before starting processing."""
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# Make sure the tempdir exists and is writable
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try:
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with utils.tempdir():
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pass
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except Exception as e:
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LOG.error(_LE('Temporary directory is invalid: %s'), e)
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sys.exit(1)
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def reset(self):
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self.manager.reset()
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def process_launcher():
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return service.ProcessLauncher(CONF)
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