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#!/usr/bin/env python
#
# Copyright 2016 Confluent Inc.
#
# 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.
#
#
# Example high-level Kafka 0.9 balanced Consumer
#
from confluent_kafka import Consumer, KafkaException
import sys
import getopt
import json
import logging
from pprint import pformat
def stats_cb(stats_json_str):
stats_json = json.loads(stats_json_str)
print('\nKAFKA Stats: {}\n'.format(pformat(stats_json)))
def print_usage_and_exit(program_name):
sys.stderr.write('Usage: %s [options..] <bootstrap-brokers> <group> <topic1> <topic2> ..\n' % program_name)
options = '''
Options:
-T <intvl> Enable client statistics at specified interval (ms)
'''
sys.stderr.write(options)
sys.exit(1)
if __name__ == '__main__':
optlist, argv = getopt.getopt(sys.argv[1:], 'T:')
if len(argv) < 3:
print_usage_and_exit(sys.argv[0])
broker = argv[0]
group = argv[1]
topics = argv[2:]
# Consumer configuration
# See https://github.com/edenhill/librdkafka/blob/master/CONFIGURATION.md
conf = {'bootstrap.servers': broker, 'group.id': group, 'session.timeout.ms': 6000,
'auto.offset.reset': 'earliest'}
# Check to see if -T option exists
for opt in optlist:
if opt[0] != '-T':
continue
try:
intval = int(opt[1])
except ValueError:
sys.stderr.write("Invalid option value for -T: %s\n" % opt[1])
sys.exit(1)
if intval <= 0:
sys.stderr.write("-T option value needs to be larger than zero: %s\n" % opt[1])
sys.exit(1)
conf['stats_cb'] = stats_cb
conf['statistics.interval.ms'] = int(opt[1])
# Create logger for consumer (logs will be emitted when poll() is called)
logger = logging.getLogger('consumer')
logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler()
handler.setFormatter(logging.Formatter('%(asctime)-15s %(levelname)-8s %(message)s'))
logger.addHandler(handler)
# Create Consumer instance
# Hint: try debug='fetch' to generate some log messages
c = Consumer(conf, logger=logger)
def print_assignment(consumer, partitions):
print('Assignment:', partitions)
# Subscribe to topics
c.subscribe(topics, on_assign=print_assignment)
# Read messages from Kafka, print to stdout
try:
while True:
msg = c.poll(timeout=1.0)
if msg is None:
continue
if msg.error():
raise KafkaException(msg.error())
else:
# Proper message
sys.stderr.write('%% %s [%d] at offset %d with key %s:\n' %
(msg.topic(), msg.partition(), msg.offset(),
str(msg.key())))
print(msg.value())
except KeyboardInterrupt:
sys.stderr.write('%% Aborted by user\n')
finally:
# Close down consumer to commit final offsets.
c.close()
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