# -*- encoding: utf-8 -*-
# Copyright (c) 2016 Servionica
#
# 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.
"""
Service mechanism provides ability to monitor Watcher services state.
"""
import datetime
import six
from oslo_config import cfg
from oslo_log import log
from oslo_utils import timeutils
import pecan
from pecan import rest
import wsme
from wsme import types as wtypes
import wsmeext.pecan as wsme_pecan
from watcher.api.controllers import base
from watcher.api.controllers import link
from watcher.api.controllers.v1 import collection
from watcher.api.controllers.v1 import utils as api_utils
from watcher.common import context
from watcher.common import exception
from watcher.common import policy
from watcher import objects
CONF = cfg.CONF
LOG = log.getLogger(__name__)
[docs]class Service(base.APIBase):
"""API representation of a service.
This class enforces type checking and value constraints, and converts
between the internal object model and the API representation of a service.
"""
_status = None
_context = context.RequestContext(is_admin=True)
def _get_status(self):
return self._status
def _set_status(self, id):
service = objects.Service.get(pecan.request.context, id)
last_heartbeat = (service.last_seen_up or service.updated_at
or service.created_at)
if isinstance(last_heartbeat, six.string_types):
# NOTE(russellb) If this service came in over rpc via
# conductor, then the timestamp will be a string and needs to be
# converted back to a datetime.
last_heartbeat = timeutils.parse_strtime(last_heartbeat)
else:
# Objects have proper UTC timezones, but the timeutils comparison
# below does not (and will fail)
last_heartbeat = last_heartbeat.replace(tzinfo=None)
elapsed = timeutils.delta_seconds(last_heartbeat, timeutils.utcnow())
is_up = abs(elapsed) <= CONF.service_down_time
if not is_up:
LOG.warning('Seems service %(name)s on host %(host)s is down. '
'Last heartbeat was %(lhb)s.'
'Elapsed time is %(el)s',
{'name': service.name,
'host': service.host,
'lhb': str(last_heartbeat), 'el': str(elapsed)})
self._status = objects.service.ServiceStatus.FAILED
else:
self._status = objects.service.ServiceStatus.ACTIVE
id = wsme.wsattr(int, readonly=True)
"""ID for this service."""
name = wtypes.text
"""Name of the service."""
host = wtypes.text
"""Host where service is placed on."""
last_seen_up = wsme.wsattr(datetime.datetime, readonly=True)
"""Time when Watcher service sent latest heartbeat."""
status = wsme.wsproperty(wtypes.text, _get_status, _set_status,
mandatory=True)
links = wsme.wsattr([link.Link], readonly=True)
"""A list containing a self link."""
def __init__(self, **kwargs):
super(Service, self).__init__()
fields = list(objects.Service.fields.keys()) + ['status']
self.fields = []
for field in fields:
self.fields.append(field)
setattr(self, field, kwargs.get(
field if field != 'status' else 'id', wtypes.Unset))
@staticmethod
def _convert_with_links(service, url, expand=True):
if not expand:
service.unset_fields_except(
['id', 'name', 'host', 'status'])
service.links = [
link.Link.make_link('self', url, 'services', str(service.id)),
link.Link.make_link('bookmark', url, 'services', str(service.id),
bookmark=True)]
return service
[docs] @classmethod
def convert_with_links(cls, service, expand=True):
service = Service(**service.as_dict())
return cls._convert_with_links(
service, pecan.request.host_url, expand)
[docs] @classmethod
def sample(cls, expand=True):
sample = cls(id=1,
name='watcher-applier',
host='Controller',
last_seen_up=datetime.datetime(2016, 1, 1))
return cls._convert_with_links(sample, 'http://localhost:9322', expand)
[docs]class ServiceCollection(collection.Collection):
"""API representation of a collection of services."""
services = [Service]
"""A list containing services objects"""
def __init__(self, **kwargs):
super(ServiceCollection, self).__init__()
self._type = 'services'
[docs] @staticmethod
def convert_with_links(services, limit, url=None, expand=False,
**kwargs):
service_collection = ServiceCollection()
service_collection.services = [
Service.convert_with_links(g, expand) for g in services]
if 'sort_key' in kwargs:
reverse = False
if kwargs['sort_key'] == 'service':
if 'sort_dir' in kwargs:
reverse = True if kwargs['sort_dir'] == 'desc' else False
service_collection.services = sorted(
service_collection.services,
key=lambda service: service.id,
reverse=reverse)
service_collection.next = service_collection.get_next(
limit, url=url, marker_field='id', **kwargs)
return service_collection
[docs] @classmethod
def sample(cls):
sample = cls()
sample.services = [Service.sample(expand=False)]
return sample
[docs]class ServicesController(rest.RestController):
"""REST controller for Services."""
def __init__(self):
super(ServicesController, self).__init__()
from_services = False
"""A flag to indicate if the requests to this controller are coming
from the top-level resource Services."""
_custom_actions = {
'detail': ['GET'],
}
def _get_services_collection(self, marker, limit, sort_key, sort_dir,
expand=False, resource_url=None):
limit = api_utils.validate_limit(limit)
api_utils.validate_sort_dir(sort_dir)
sort_db_key = (sort_key if sort_key in objects.Service.fields.keys()
else None)
marker_obj = None
if marker:
marker_obj = objects.Service.get(
pecan.request.context, marker)
services = objects.Service.list(
pecan.request.context, limit, marker_obj,
sort_key=sort_db_key, sort_dir=sort_dir)
return ServiceCollection.convert_with_links(
services, limit, url=resource_url, expand=expand,
sort_key=sort_key, sort_dir=sort_dir)
[docs] @wsme_pecan.wsexpose(ServiceCollection, int, int, wtypes.text, wtypes.text)
def get_all(self, marker=None, limit=None, sort_key='id', sort_dir='asc'):
"""Retrieve a list of services.
:param marker: pagination marker for large data sets.
:param limit: maximum number of resources to return in a single result.
:param sort_key: column to sort results by. Default: id.
:param sort_dir: direction to sort. "asc" or "desc". Default: asc.
"""
context = pecan.request.context
policy.enforce(context, 'service:get_all',
action='service:get_all')
return self._get_services_collection(marker, limit, sort_key, sort_dir)
[docs] @wsme_pecan.wsexpose(ServiceCollection, int, int, wtypes.text, wtypes.text)
def detail(self, marker=None, limit=None, sort_key='id', sort_dir='asc'):
"""Retrieve a list of services with detail.
:param marker: pagination marker for large data sets.
:param limit: maximum number of resources to return in a single result.
:param sort_key: column to sort results by. Default: id.
:param sort_dir: direction to sort. "asc" or "desc". Default: asc.
"""
context = pecan.request.context
policy.enforce(context, 'service:detail',
action='service:detail')
# NOTE(lucasagomes): /detail should only work agaist collections
parent = pecan.request.path.split('/')[:-1][-1]
if parent != "services":
raise exception.HTTPNotFound
expand = True
resource_url = '/'.join(['services', 'detail'])
return self._get_services_collection(
marker, limit, sort_key, sort_dir, expand, resource_url)
[docs] @wsme_pecan.wsexpose(Service, wtypes.text)
def get_one(self, service):
"""Retrieve information about the given service.
:param service: ID or name of the service.
"""
if self.from_services:
raise exception.OperationNotPermitted
context = pecan.request.context
rpc_service = api_utils.get_resource('Service', service)
policy.enforce(context, 'service:get', rpc_service,
action='service:get')
return Service.convert_with_links(rpc_service)
Except where otherwise noted, this document is licensed under Creative Commons Attribution 3.0 License. See all OpenStack Legal Documents.