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import collections
import logging
import threading
import time
import pytest
import six
from kafka import SimpleClient
from kafka.common import TopicPartition
from kafka.conn import ConnectionStates
from kafka.consumer.group import KafkaConsumer
from kafka.future import Future
from kafka.protocol.metadata import MetadataResponse
from test.conftest import version
from test.testutil import random_string
@pytest.fixture
def simple_client(kafka_broker):
connect_str = 'localhost:' + str(kafka_broker.port)
return SimpleClient(connect_str)
@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))
connect_str = 'localhost:' + str(kafka_broker.port)
consumer = KafkaConsumer(bootstrap_servers=connect_str)
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 = 'localhost:' + str(kafka_broker.port)
consumers = {}
stop = {}
messages = collections.defaultdict(list)
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,
heartbeat_interval_ms=500)
while not stop[i].is_set():
for tp, records in six.itervalues(consumers[i].poll()):
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.daemon = True
t.start()
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
# Verify all consumers are in the same generation
generations = set()
for consumer in six.itervalues(consumers):
generations.add(consumer._coordinator.generation)
if len(generations) != 1:
break
# If all checks passed, log state and break while loop
else:
for c in range(num_consumers):
logging.info("[%s] %s %s: %s", c,
consumers[c]._coordinator.generation,
consumers[c]._coordinator.member_id,
consumers[c].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()
@pytest.fixture
def conn(mocker):
conn = mocker.patch('kafka.client_async.BrokerConnection')
conn.return_value = conn
conn.state = ConnectionStates.CONNECTED
conn.send.return_value = Future().success(
MetadataResponse(
[(0, 'foo', 12), (1, 'bar', 34)], # brokers
[])) # topics
return conn
def test_heartbeat_timeout(conn, mocker):
mocker.patch('kafka.client_async.KafkaClient.check_version', return_value = '0.9')
mocker.patch('time.time', return_value = 1234)
consumer = KafkaConsumer('foobar')
mocker.patch.object(consumer._coordinator.heartbeat, 'ttl', return_value = 0)
assert consumer._next_timeout() == 1234
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