bigtop-packages/src/charm/kafka/layer-kafka/actions/list-topics

#!/usr/local/sbin/charm-env python3

# 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
#
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import kafkautils
import subprocess

from charmhelpers.core import hookenv, host
from charms.reactive import is_state
from jujubigdata.utils import run_as


if not is_state('kafka.started'):
    kafkautils.fail('Kafka service not yet ready')


# List topics if kafka is running
if host.service_available('kafka-server') and host.service_running('kafka-server'):
    zookeepers = kafkautils.get_zookeepers()
    try:
        output = run_as('kafka', '/usr/lib/kafka/bin/kafka-topics.sh',
                        '--zookeeper', zookeepers, '--list',
                        capture_output=True)
    except subprocess.CalledProcessError as e:
        kafkautils.fail('Kafka command failed: {}'.format(e.output))
    else:
        hookenv.action_set({'raw': output})
        hookenv.action_set({'outcome': 'success'})
else:
    kafkautils.fail('kafka-server service is not running')