98 lines
3.8 KiB
Python
98 lines
3.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2011 Cisco Systems, Inc. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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# @author: Sumit Naiksatam, Cisco Systems, Inc.
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#
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from nova import exception as excp
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from nova import flags
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from nova import log as logging
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from nova.scheduler import driver
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from quantum.client import Client
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from quantum.common.wsgi import Serializer
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LOG = logging.getLogger('quantum.plugins.cisco.nova.quantum_aware_scheduler')
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FLAGS = flags.FLAGS
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flags.DEFINE_string('quantum_host', "127.0.0.1",
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'IP address of the quantum network service.')
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flags.DEFINE_integer('quantum_port', 9696,
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'Listening port for Quantum network service')
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HOST = FLAGS.quantum_host
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PORT = FLAGS.quantum_port
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USE_SSL = False
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ACTION_PREFIX_EXT = '/v0.1'
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ACTION_PREFIX_CSCO = ACTION_PREFIX_EXT + \
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'/extensions/csco/tenants/{tenant_id}'
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TENANT_ID = 'nova'
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CSCO_EXT_NAME = 'Cisco Nova Tenant'
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class QuantumScheduler(driver.Scheduler):
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"""
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Quantum network service dependent scheduler
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Obtains the hostname from Quantum using an extension API
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"""
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def __init__(self):
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# We have to send a dummy tenant name here since the client
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# needs some tenant name, but the tenant name will not be used
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# since the extensions URL does not require it
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client = Client(HOST, PORT, USE_SSL, format='json',
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action_prefix=ACTION_PREFIX_EXT, tenant="dummy")
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request_url = "/extensions"
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data = client.do_request('GET', request_url)
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LOG.debug("Obtained supported extensions from Quantum: %s" % data)
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for ext in data['extensions']:
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name = ext['name']
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if name == CSCO_EXT_NAME:
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LOG.debug("Quantum plugin supports required \"%s\" extension"
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"for the scheduler." % name)
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return
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LOG.error("Quantum plugin does not support required \"%s\" extension"
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" for the scheduler. Scheduler will quit." % CSCO_EXT_NAME)
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raise excp.ServiceUnavailable()
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def schedule(self, context, topic, *args, **kwargs):
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"""Gets the host name from the Quantum service"""
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instance_id = kwargs['instance_id']
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user_id = \
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kwargs['request_spec']['instance_properties']['user_id']
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project_id = \
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kwargs['request_spec']['instance_properties']['project_id']
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instance_data_dict = \
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{'novatenant': \
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{'instance_id': instance_id,
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'instance_desc': \
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{'user_id': user_id,
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'project_id': project_id
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}}}
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client = Client(HOST, PORT, USE_SSL, format='json', tenant=TENANT_ID,
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action_prefix=ACTION_PREFIX_CSCO)
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request_url = "/novatenants/" + project_id + "/get_host"
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data = client.do_request('PUT', request_url, body=instance_data_dict)
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hostname = data["host_list"]["host_1"]
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if not hostname:
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raise driver.NoValidHost(_("Scheduler was unable to locate a host"
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" for this request. Is the appropriate"
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" service running?"))
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LOG.debug(_("Quantum service returned host: %s\n") % hostname)
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return hostname
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