# Copyright 2015 Huawei Technologies Co., Ltd.
#
#    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.

from oslo_config import cfg
from oslo_log import log as logging
from pecan import rest
import six
import tooz.coordination
import wsmeext.pecan as wsme_pecan

from mistral.api import access_control as acl
from mistral.api.controllers.v2 import resources
# TODO(rakhmerov): invalid dependency, a REST controller must not depend on
# a launch script.
from mistral.cmd import launch
from mistral import context
from mistral import exceptions as exc
from mistral.service import coordination
from mistral.utils import rest_utils


LOG = logging.getLogger(__name__)


class ServicesController(rest.RestController):
    @rest_utils.wrap_wsme_controller_exception
    @wsme_pecan.wsexpose(resources.Services)
    def get_all(self):
        """Return all services."""
        acl.enforce('services:list', context.ctx())

        LOG.info("Fetch services.")

        if not cfg.CONF.coordination.backend_url:
            raise exc.CoordinationException("Service API is not supported.")

        service_coordinator = coordination.get_service_coordinator()

        if not service_coordinator.is_active():
            raise exc.CoordinationException(
                "Failed to connect to coordination backend."
            )

        services_list = []
        service_group = ['%s_group' % i for i in launch.LAUNCH_OPTIONS]

        try:
            for group in service_group:
                members = service_coordinator.get_members(group)
                services_list.extend(
                    [resources.Service.from_dict(
                        {'type': group, 'name': member}) for member in members]
                )
        except tooz.coordination.ToozError as e:
            # In the scenario of network interruption or manually shutdown
            # connection shutdown, ToozError will be raised.
            raise exc.CoordinationException(
                "Failed to get service members from coordination backend. %s"
                % six.text_type(e)
            )

        return resources.Services(services=services_list)

[(33, 'oslo_log.log.getLogger', 'logging.getLogger', True, 'from oslo_log import log as logging\n'), (38, 'wsmeext.pecan.wsexpose', 'wsme_pecan.wsexpose', True, 'import wsmeext.pecan as wsme_pecan\n'), (48, 'mistral.service.coordination.get_service_coordinator', 'coordination.get_service_coordinator', False, 'from mistral.service import coordination\n'), (73, 'mistral.api.controllers.v2.resources.Services', 'resources.Services', False, 'from mistral.api.controllers.v2 import resources\n'), (41, 'mistral.context.ctx', 'context.ctx', False, 'from mistral import context\n'), (46, 'mistral.exceptions.CoordinationException', 'exc.CoordinationException', True, 'from mistral import exceptions as exc\n'), (51, 'mistral.exceptions.CoordinationException', 'exc.CoordinationException', True, 'from mistral import exceptions as exc\n'), (62, 'mistral.api.controllers.v2.resources.Service.from_dict', 'resources.Service.from_dict', False, 'from mistral.api.controllers.v2 import resources\n'), (70, 'six.text_type', 'six.text_type', False, 'import six\n')]