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import collections
import logging
import threading
import time
import pytest
import six
from kafka import SimpleClient
from kafka.conn import ConnectionStates
from kafka.consumer.group import KafkaConsumer
from kafka.structs import TopicPartition
from test.conftest import version
from test.testutil import random_string
def get_connect_str(kafka_broker):
return kafka_broker.host + ':' + str(kafka_broker.port)
@pytest.fixture
def simple_client(kafka_broker):
return SimpleClient(get_connect_str(kafka_broker))
@pytest.fixture
def topic(simple_client):
topic = random_string(5)
simple_client.ensure_topic_exists(topic)
return topic
@pytest.mark.skipif(not version(), reason="No KAFKA_VERSION set")
def test_consumer(kafka_broker, version):
# 0.8.2 brokers need a topic to function well
if version >= (0, 8, 2) and version < (0, 9):
topic(simple_client(kafka_broker))
consumer = KafkaConsumer(bootstrap_servers=get_connect_str(kafka_broker))
consumer.poll(500)
assert len(consumer._client._conns) > 0
node_id = list(consumer._client._conns.keys())[0]
assert consumer._client._conns[node_id].state is ConnectionStates.CONNECTED
@pytest.mark.skipif(version() < (0, 9), reason='Unsupported Kafka Version')
@pytest.mark.skipif(not version(), reason="No KAFKA_VERSION set")
def test_group(kafka_broker, topic):
num_partitions = 4
connect_str = get_connect_str(kafka_broker)
consumers = {}
stop = {}
threads = {}
messages = collections.defaultdict(list)
group_id = 'test-group-' + random_string(6)
def consumer_thread(i):
assert i not in consumers
assert i not in stop
stop[i] = threading.Event()
consumers[i] = KafkaConsumer(topic,
bootstrap_servers=connect_str,
group_id=group_id,
heartbeat_interval_ms=500)
while not stop[i].is_set():
for tp, records in six.itervalues(consumers[i].poll(100)):
messages[i][tp].extend(records)
consumers[i].close()
del consumers[i]
del stop[i]
num_consumers = 4
for i in range(num_consumers):
t = threading.Thread(target=consumer_thread, args=(i,))
t.start()
threads[i] = t
try:
timeout = time.time() + 35
while True:
for c in range(num_consumers):
# Verify all consumers have been created
if c not in consumers:
break
# Verify all consumers have an assignment
elif not consumers[c].assignment():
break
# If all consumers exist and have an assignment
else:
# Verify all consumers are in the same generation
# then log state and break while loop
generations = set([consumer._coordinator.generation
for consumer in list(consumers.values())])
# New generation assignment is not complete until
# coordinator.rejoining = False
rejoining = any([consumer._coordinator.rejoining
for consumer in list(consumers.values())])
if not rejoining and len(generations) == 1:
for c, consumer in list(consumers.items()):
logging.info("[%s] %s %s: %s", c,
consumer._coordinator.generation,
consumer._coordinator.member_id,
consumer.assignment())
break
assert time.time() < timeout, "timeout waiting for assignments"
group_assignment = set()
for c in range(num_consumers):
assert len(consumers[c].assignment()) != 0
assert set.isdisjoint(consumers[c].assignment(), group_assignment)
group_assignment.update(consumers[c].assignment())
assert group_assignment == set([
TopicPartition(topic, partition)
for partition in range(num_partitions)])
finally:
for c in range(num_consumers):
stop[c].set()
threads[c].join()
@pytest.mark.skipif(not version(), reason="No KAFKA_VERSION set")
def test_paused(kafka_broker, topic):
consumer = KafkaConsumer(bootstrap_servers=get_connect_str(kafka_broker))
topics = [TopicPartition(topic, 1)]
consumer.assign(topics)
assert set(topics) == consumer.assignment()
assert set() == consumer.paused()
consumer.pause(topics[0])
assert set([topics[0]]) == consumer.paused()
consumer.resume(topics[0])
assert set() == consumer.paused()
consumer.unsubscribe()
assert set() == consumer.paused()
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