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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 import TopicPartition
from kafka.streams.errors import TaskAssignmentError
from kafka.streams.processor.partition_group import TaskId
log = logging.getLogger(__name__)
class AssignmentInfo(object):
CURRENT_VERSION = 1
def __init__(self, active_tasks, standby_tasks, version=None):
self.version = self.CURRENT_VERSION if version is None else version
self.active_tasks = active_tasks
self.standby_tasks = standby_tasks
def encode(self):
try:
if self.version == self.CURRENT_VERSION:
data = {
'version': self.version,
'active_tasks': [list(task) for task in self.active_tasks],
'standby_tasks': [[list(task), [list(tp) for tp in partitions]]
for task, partitions in self.standby_tasks.items()]
}
return json.dumps(data).encode('utf-8')
else:
raise TaskAssignmentError('Unable to encode assignment data: version=' + str(self.version))
except Exception as ex:
raise TaskAssignmentError('Failed to encode AssignmentInfo', ex)
@classmethod
def decode(cls, data):
try:
decoded = json.loads(data.decode('utf-8'))
if decoded['version'] == cls.CURRENT_VERSION:
decoded['active_tasks'] = [TaskId(*task) for task in decoded['active_tasks']]
decoded['standby_tasks'] = dict([
(TaskId(*task), set([TopicPartition(*partition) for partition in partitions]))
for task, partitions in decoded['standby_tasks']])
return AssignmentInfo(decoded['active_tasks'], decoded['standby_tasks'])
else:
raise TaskAssignmentError('Unknown assignment data version: ' + str(cls.version))
except Exception as ex:
raise TaskAssignmentError('Failed to decode AssignmentInfo', ex)
def __str__(self):
return "[version=%d, active_tasks=%d, standby_tasks=%d]" % (
self.version, len(self.active_tasks), len(self.standby_tasks))
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