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# Copyright 2012, Red Hat, Inc.
#
#    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.

"""
Unit Tests for nova.scheduler.rpcapi
"""

from nova import config
from nova import context
from nova import flags
from nova.openstack.common import rpc
from nova.scheduler import rpcapi as scheduler_rpcapi
from nova import test

CONF = config.CONF


class SchedulerRpcAPITestCase(test.TestCase):
    def _test_scheduler_api(self, method, rpc_method, **kwargs):
        ctxt = context.RequestContext('fake_user', 'fake_project')
        rpcapi = scheduler_rpcapi.SchedulerAPI()
        expected_retval = 'foo' if method == 'call' else None
        expected_version = kwargs.pop('version', rpcapi.BASE_RPC_API_VERSION)
        expected_msg = rpcapi.make_msg(method, **kwargs)
        expected_msg['version'] = expected_version

        self.fake_args = None
        self.fake_kwargs = None

        def _fake_rpc_method(*args, **kwargs):
            self.fake_args = args
            self.fake_kwargs = kwargs
            if expected_retval:
                return expected_retval

        self.stubs.Set(rpc, rpc_method, _fake_rpc_method)

        retval = getattr(rpcapi, method)(ctxt, **kwargs)

        self.assertEqual(retval, expected_retval)
        expected_args = [ctxt, CONF.scheduler_topic, expected_msg]
        for arg, expected_arg in zip(self.fake_args, expected_args):
            self.assertEqual(arg, expected_arg)

    def test_run_instance(self):
        self._test_scheduler_api('run_instance', rpc_method='cast',
                request_spec='fake_request_spec',
                admin_password='pw', injected_files='fake_injected_files',
                requested_networks='fake_requested_networks',
                is_first_time=True, filter_properties='fake_filter_properties')

    def test_prep_resize(self):
        self._test_scheduler_api('prep_resize', rpc_method='cast',
                instance='fake_instance',
                instance_type='fake_type', image='fake_image',
                request_spec='fake_request_spec',
                filter_properties='fake_props', reservations=list('fake_res'))

    def test_show_host_resources(self):
        self._test_scheduler_api('show_host_resources', rpc_method='call',
                host='fake_host')

    def test_live_migration(self):
        self._test_scheduler_api('live_migration', rpc_method='call',
                block_migration='fake_block_migration',
                disk_over_commit='fake_disk_over_commit',
                instance='fake_instance', dest='fake_dest')

    def test_update_service_capabilities(self):
        self._test_scheduler_api('update_service_capabilities',
                rpc_method='fanout_cast', service_name='fake_name',
                host='fake_host', capabilities='fake_capabilities')
