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"""
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 __future__ import absolute_import
import json
import logging
from kafka.streams.errors import TaskAssignmentError
from kafka.streams.processor.partition_group import TaskId
log = logging.getLogger(__name__)
class SubscriptionInfo(object):
CURRENT_VERSION = 1
def __init__(self, process_id, prev_tasks, standby_tasks, version=None):
self.version = self.CURRENT_VERSION if version is None else version
self.process_id = process_id
self.prev_tasks = prev_tasks
self.standby_tasks = standby_tasks
def encode(self):
if self.version == self.CURRENT_VERSION:
data = {
'version': self.version,
'process_id': self.process_id,
'prev_tasks': list(self.prev_tasks),
'standby_tasks': list(self.standby_tasks)
}
return json.dumps(data).encode('utf-8')
else:
raise TaskAssignmentError('unable to encode subscription data: version=' + str(self.version))
@classmethod
def decode(cls, data):
try:
decoded = json.loads(data.decode('utf-8'))
if decoded['version'] != cls.CURRENT_VERSION:
raise TaskAssignmentError('unable to decode subscription data: version=' + str(cls.version))
decoded['prev_tasks'] = set([TaskId(*item) for item in decoded['prev_tasks']])
decoded['standby_tasks'] = set([TaskId(*item) for item in decoded['standby_tasks']])
return cls(decoded['process_id'], decoded['prev_tasks'], decoded['standby_tasks'], decoded['version'])
except Exception as e:
raise TaskAssignmentError('unable to decode subscription data', data, e)
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