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# Copyright (c) 2017 Cable Television Laboratories, Inc. ("CableLabs")
# and others. All rights reserved.
#
# 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.
import enum
class Consumer(enum.Enum):
"""
QoS Specification consumer types
"""
front_end = 'front-end'
back_end = 'back-end'
both = 'both'
class QoSConfig(object):
def __init__(self, **kwargs):
"""
Constructor
:param name: the qos's name (required)
:param consumer: the qos's consumer type of the enum type Consumer
(required)
:param specs: dict of key/values
"""
self.name = kwargs.get('name')
if kwargs.get('consumer'):
self.consumer = map_consumer(kwargs['consumer'])
else:
self.consumer = None
self.specs = kwargs.get('specs')
if not self.specs:
self.specs = dict()
if not self.name or not self.consumer:
raise QoSConfigError(
"The attributes name and consumer are required")
def map_consumer(consumer):
"""
Takes a the protocol value maps it to the Consumer enum. When None return
None
:param consumer: the value to map to the Enum
:return: the Protocol enum object
:raise: Exception if value is invalid
"""
if not consumer:
return None
elif isinstance(consumer, Consumer):
return consumer
elif isinstance(consumer, str):
proto_str = str(consumer)
if proto_str == 'front-end':
return Consumer.front_end
elif proto_str == 'back-end':
return Consumer.back_end
elif proto_str == 'both':
return Consumer.both
else:
raise QoSConfigError('Invalid Consumer - ' + proto_str)
else:
if consumer.value == 'front-end':
return Consumer.front_end
elif consumer.value == 'back-end':
return Consumer.back_end
elif consumer.value == 'both':
return Consumer.both
else:
raise QoSConfigError('Invalid Consumer - ' + consumer.value)
class QoSConfigError(Exception):
"""
Exception to be thrown when an qos settings are incorrect
"""
def __init__(self, message):
Exception.__init__(self, message)
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