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from mock import MagicMock, patch
from . import unittest
from kafka import SimpleConsumer, KafkaConsumer, MultiProcessConsumer
from kafka.common import (
KafkaConfigurationError, FetchResponse,
FailedPayloadsError, OffsetAndMessage,
NotLeaderForPartitionError, UnknownTopicOrPartitionError
)
class TestKafkaConsumer(unittest.TestCase):
def test_non_integer_partitions(self):
with self.assertRaises(AssertionError):
SimpleConsumer(MagicMock(), 'group', 'topic', partitions = [ '0' ])
def test_broker_list_required(self):
with self.assertRaises(KafkaConfigurationError):
KafkaConsumer()
class TestMultiProcessConsumer(unittest.TestCase):
def test_partition_list(self):
client = MagicMock()
partitions = (0,)
with patch.object(MultiProcessConsumer, 'fetch_last_known_offsets') as fetch_last_known_offsets:
consumer = MultiProcessConsumer(client, 'testing-group', 'testing-topic', partitions=partitions)
self.assertEqual(fetch_last_known_offsets.call_args[0], (partitions,) )
self.assertEqual(client.get_partition_ids_for_topic.call_count, 0) # pylint: disable=no-member
def test_simple_consumer_failed_payloads(self):
client = MagicMock()
consumer = SimpleConsumer(client, group=None,
topic='topic', partitions=[0, 1],
auto_commit=False)
def failed_payloads(payload):
return FailedPayloadsError(payload)
client.send_fetch_request.side_effect = self.fail_requests_factory(failed_payloads)
# This should not raise an exception
consumer.get_messages(5)
def test_simple_consumer_leader_change(self):
client = MagicMock()
consumer = SimpleConsumer(client, group=None,
topic='topic', partitions=[0, 1],
auto_commit=False)
# Mock so that only the first request gets a valid response
def not_leader(request):
return FetchResponse(request.topic, request.partition,
NotLeaderForPartitionError.errno, -1, ())
client.send_fetch_request.side_effect = self.fail_requests_factory(not_leader)
# This should not raise an exception
consumer.get_messages(20)
# client should have updated metadata
self.assertGreaterEqual(client.reset_topic_metadata.call_count, 1)
self.assertGreaterEqual(client.load_metadata_for_topics.call_count, 1)
def test_simple_consumer_unknown_topic_partition(self):
client = MagicMock()
consumer = SimpleConsumer(client, group=None,
topic='topic', partitions=[0, 1],
auto_commit=False)
# Mock so that only the first request gets a valid response
def unknown_topic_partition(request):
return FetchResponse(request.topic, request.partition,
UnknownTopicOrPartitionError.errno, -1, ())
client.send_fetch_request.side_effect = self.fail_requests_factory(unknown_topic_partition)
# This should not raise an exception
with self.assertRaises(UnknownTopicOrPartitionError):
consumer.get_messages(20)
@staticmethod
def fail_requests_factory(error_factory):
# Mock so that only the first request gets a valid response
def fail_requests(payloads, **kwargs):
responses = [
FetchResponse(payloads[0].topic, payloads[0].partition, 0, 0,
(OffsetAndMessage(
payloads[0].offset + i,
"msg %d" % (payloads[0].offset + i))
for i in range(10))),
]
for failure in payloads[1:]:
responses.append(error_factory(failure))
return responses
return fail_requests
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