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#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2020 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
# limit
#
import inspect
import sys
from uuid import uuid1
from confluent_kafka import Consumer, KafkaError
def called_by():
if sys.version_info < (3, 5):
return inspect.stack()[1][3]
return inspect.stack()[1].function
def prefixed_error_cb(prefix):
def error_cb(err):
""" Reports global/generic errors to aid in troubleshooting test failures. """
print("[{}]: {}".format(prefix, err))
return error_cb
def prefixed_delivery_cb(prefix):
def delivery_err(err, msg):
""" Reports failed message delivery to aid in troubleshooting test failures. """
if err:
print("[{}]: Message delivery failed ({} [{}]): {}".format(
prefix, msg.topic(), str(msg.partition()), err))
return
return delivery_err
def test_commit_transaction(kafka_cluster):
output_topic = kafka_cluster.create_topic("output_topic")
producer = kafka_cluster.producer({
'transactional.id': 'example_transactional_id',
'error_cb': prefixed_error_cb('test_commit_transaction'),
})
producer.init_transactions()
transactional_produce(producer, output_topic, 100)
producer.commit_transaction()
assert consume_committed(kafka_cluster.client_conf(), output_topic) == 100
def test_abort_transaction(kafka_cluster):
output_topic = kafka_cluster.create_topic("output_topic")
producer = kafka_cluster.producer({
'transactional.id': 'example_transactional_id',
'error_cb': prefixed_error_cb('test_abort_transaction'),
})
producer.init_transactions()
transactional_produce(producer, output_topic, 100)
producer.abort_transaction()
assert consume_committed(kafka_cluster.client_conf(), output_topic) == 0
def test_abort_retry_commit_transaction(kafka_cluster):
output_topic = kafka_cluster.create_topic("output_topic")
producer = kafka_cluster.producer({
'transactional.id': 'example_transactional_id',
'error_cb': prefixed_error_cb('test_abort_retry_commit_transaction'),
})
producer.init_transactions()
transactional_produce(producer, output_topic, 100)
producer.abort_transaction()
transactional_produce(producer, output_topic, 25)
producer.commit_transaction()
assert consume_committed(kafka_cluster.client_conf(), output_topic) == 25
def test_send_offsets_committed_transaction(kafka_cluster):
input_topic = kafka_cluster.create_topic("input_topic")
output_topic = kafka_cluster.create_topic("output_topic")
error_cb = prefixed_error_cb('test_send_offsets_committed_transaction')
producer = kafka_cluster.producer({
'client.id': 'producer1',
'transactional.id': 'example_transactional_id',
'error_cb': error_cb,
})
consumer_conf = {
'group.id': str(uuid1()),
'auto.offset.reset': 'earliest',
'enable.auto.commit': False,
'enable.partition.eof': True,
'error_cb': error_cb
}
consumer_conf.update(kafka_cluster.client_conf())
consumer = Consumer(consumer_conf)
kafka_cluster.seed_topic(input_topic)
consumer.subscribe([input_topic])
read_all_msgs(consumer)
producer.init_transactions()
transactional_produce(producer, output_topic, 100)
consumer_position = consumer.position(consumer.assignment())
group_metadata = consumer.consumer_group_metadata()
print("=== Sending offsets {} to transaction ===".format(consumer_position))
producer.send_offsets_to_transaction(consumer_position, group_metadata)
producer.commit_transaction()
producer2 = kafka_cluster.producer({
'client.id': 'producer2',
'transactional.id': 'example_transactional_id',
'error_cb': error_cb
})
# ensure offset commits are visible prior to sending FetchOffsets request
producer2.init_transactions()
committed_offsets = consumer.committed(consumer.assignment())
print("=== Committed offsets for {} ===".format(committed_offsets))
assert [tp.offset for tp in committed_offsets] == [100]
consumer.close()
def transactional_produce(producer, topic, num_messages):
print("=== Producing {} transactional messages to topic {}. ===".format(
num_messages, topic))
producer.begin_transaction()
for value in ['test-data{}'.format(i) for i in range(0, num_messages)]:
producer.produce(topic, value, on_delivery=prefixed_delivery_cb(called_by()))
producer.poll(0.0)
producer.flush()
def read_all_msgs(consumer):
"""
Consumes all messages in the consumer assignment.
This method assumes the consumer has not already read all of the
messages available in a partition.
:param consumer:
:returns: total messages read
:rtype: int
"""
msg_cnt = 0
eof = {}
print("=== Draining {} ===".format(consumer.assignment()))
while (True):
msg = consumer.poll(timeout=1.0)
if msg is None:
continue
topic, partition = msg.topic(), msg.partition()
if msg.error():
if msg.error().code() == KafkaError._PARTITION_EOF:
eof[(topic, partition)] = True
if len(eof) == len(consumer.assignment()):
break
continue
eof.pop((topic, partition), None)
msg_cnt += 1
return msg_cnt
def consume_committed(conf, topic):
print("=== Consuming transactional messages from topic {}. ===".format(topic))
consumer_conf = {'group.id': str(uuid1()),
'auto.offset.reset': 'earliest',
'enable.auto.commit': False,
'enable.partition.eof': True,
'error_cb': prefixed_error_cb(called_by()), }
consumer_conf.update(conf)
consumer = Consumer(consumer_conf)
consumer.subscribe([topic])
msg_cnt = read_all_msgs(consumer)
consumer.close()
return msg_cnt
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