Python kafka.SimpleClient类代码示例

    def test_get_leader_for_partitions_reloads_metadata(self, protocol, conn):
        "Get leader for partitions reload metadata if it is not available"

        mock_conn(conn)

        brokers = [BrokerMetadata(0, "broker_1", 4567, None), BrokerMetadata(1, "broker_2", 5678, None)]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [(NO_LEADER, "topic_no_partitions", [])]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=["broker_1:4567"])

        # topic metadata is loaded but empty
        self.assertDictEqual({}, client.topics_to_brokers)

        topics = [(NO_ERROR, "topic_one_partition", [(NO_ERROR, 0, 0, [0, 1], [0, 1])])]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        # calling _get_leader_for_partition (from any broker aware request)
        # will try loading metadata again for the same topic
        leader = client._get_leader_for_partition("topic_one_partition", 0)

        self.assertEqual(brokers[0], leader)
        self.assertDictEqual({TopicPartition("topic_one_partition", 0): brokers[0]}, client.topics_to_brokers)

    def test_get_leader_for_unassigned_partitions(self, protocol, conn):

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567, None),
            BrokerMetadata(1, 'broker_2', 5678, None)
        ]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [
            (NO_LEADER, 'topic_no_partitions', []),
            (UNKNOWN_TOPIC_OR_PARTITION, 'topic_unknown', []),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        self.assertDictEqual({}, client.topics_to_brokers)

        with self.assertRaises(LeaderNotAvailableError):
            client._get_leader_for_partition('topic_no_partitions', 0)

        with self.assertRaises(UnknownTopicOrPartitionError):
            client._get_leader_for_partition('topic_unknown', 0)

    def test_has_metadata_for_topic(self, protocol, conn):

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567, None),
            BrokerMetadata(1, 'broker_2', 5678, None)
        ]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [
            (NO_LEADER, 'topic_still_creating', []),
            (UNKNOWN_TOPIC_OR_PARTITION, 'topic_doesnt_exist', []),
            (NO_ERROR, 'topic_noleaders', [
                (NO_LEADER, 0, -1, [], []),
                (NO_LEADER, 1, -1, [], []),
            ]),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        # Topics with no partitions return False
        self.assertFalse(client.has_metadata_for_topic('topic_still_creating'))
        self.assertFalse(client.has_metadata_for_topic('topic_doesnt_exist'))

        # Topic with partition metadata, but no leaders return True
        self.assertTrue(client.has_metadata_for_topic('topic_noleaders'))

 def test_correlation_rollover(self):
     with patch.object(SimpleClient, 'load_metadata_for_topics'):
         big_num = 2**31 - 3
         client = SimpleClient(hosts=(), correlation_id=big_num)
         self.assertEqual(big_num + 1, client._next_id())
         self.assertEqual(big_num + 2, client._next_id())
         self.assertEqual(0, client._next_id())

    def assert_message_count(self, topic, check_count, timeout=10,
                             partitions=None, at_least=False):
        hosts = ','.join(['%s:%d' % (broker.host, broker.port)
                          for broker in self.brokers])

        client = SimpleClient(hosts, timeout=2)
        consumer = SimpleConsumer(client, None, topic,
                                  partitions=partitions,
                                  auto_commit=False,
                                  iter_timeout=timeout)

        started_at = time.time()
        pending = -1
        while pending < check_count and (time.time() - started_at < timeout):
            try:
                pending = consumer.pending(partitions)
            except FailedPayloadsError:
                pass
            time.sleep(0.5)

        consumer.stop()
        client.close()

        if pending < check_count:
            self.fail('Too few pending messages: found %d, expected %d' %
                      (pending, check_count))
        elif pending > check_count and not at_least:
            self.fail('Too many pending messages: found %d, expected %d' %
                      (pending, check_count))
        return True

    def test_get_leader_for_partitions_reloads_metadata(self, protocol, conn):
        "Get leader for partitions reload metadata if it is not available"

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567),
            BrokerMetadata(1, 'broker_2', 5678)
        ]

        topics = [
            (NO_LEADER, 'topic_no_partitions', [])
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse(brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        # topic metadata is loaded but empty
        self.assertDictEqual({}, client.topics_to_brokers)

        topics = [
            (NO_ERROR, 'topic_one_partition', [
                (NO_ERROR, 0, 0, [0, 1], [0, 1])
            ])
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse(brokers, topics)

        # calling _get_leader_for_partition (from any broker aware request)
        # will try loading metadata again for the same topic
        leader = client._get_leader_for_partition('topic_one_partition', 0)

        self.assertEqual(brokers[0], leader)
        self.assertDictEqual({
            TopicPartition('topic_one_partition', 0): brokers[0]},
            client.topics_to_brokers)

    def test_get_leader_exceptions_when_noleader(self, protocol, conn):

        mock_conn(conn)

        brokers = [BrokerMetadata(0, "broker_1", 4567, None), BrokerMetadata(1, "broker_2", 5678, None)]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [(NO_ERROR, "topic_noleader", [(NO_LEADER, 0, -1, [], []), (NO_LEADER, 1, -1, [], [])])]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=["broker_1:4567"])
        self.assertDictEqual(
            {TopicPartition("topic_noleader", 0): None, TopicPartition("topic_noleader", 1): None},
            client.topics_to_brokers,
        )

        # No leader partitions -- raise LeaderNotAvailableError
        with self.assertRaises(LeaderNotAvailableError):
            self.assertIsNone(client._get_leader_for_partition("topic_noleader", 0))
        with self.assertRaises(LeaderNotAvailableError):
            self.assertIsNone(client._get_leader_for_partition("topic_noleader", 1))

        # Unknown partitions -- raise UnknownTopicOrPartitionError
        with self.assertRaises(UnknownTopicOrPartitionError):
            self.assertIsNone(client._get_leader_for_partition("topic_noleader", 2))

        topics = [(NO_ERROR, "topic_noleader", [(NO_ERROR, 0, 0, [0, 1], [0, 1]), (NO_ERROR, 1, 1, [1, 0], [1, 0])])]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)
        self.assertEqual(brokers[0], client._get_leader_for_partition("topic_noleader", 0))
        self.assertEqual(brokers[1], client._get_leader_for_partition("topic_noleader", 1))

    def test_send_produce_request_raises_when_noleader(self, protocol, conn):
        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567, None),
            BrokerMetadata(1, 'broker_2', 5678, None)
        ]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [
            (NO_ERROR, 'topic_noleader', [
                (NO_LEADER, 0, -1, [], []),
                (NO_LEADER, 1, -1, [], []),
            ]),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        requests = [ProduceRequestPayload(
            "topic_noleader", 0,
            [create_message("a"), create_message("b")])]

        with self.assertRaises(FailedPayloadsError):
            client.send_produce_request(requests)

    def test_send_broker_unaware_request(self):
        mocked_conns = {
            ('kafka01', 9092): MagicMock(),
            ('kafka02', 9092): MagicMock(),
            ('kafka03', 9092): MagicMock()
        }
        # inject BrokerConnection side effects
        mock_conn(mocked_conns[('kafka01', 9092)], success=False)
        mock_conn(mocked_conns[('kafka03', 9092)], success=False)
        future = Future()
        mocked_conns[('kafka02', 9092)].send.return_value = future
        mocked_conns[('kafka02', 9092)].recv.return_value = [('valid response', future)]

        def mock_get_conn(host, port, afi):
            return mocked_conns[(host, port)]

        # patch to avoid making requests before we want it
        with patch.object(SimpleClient, 'load_metadata_for_topics'):
            with patch.object(SimpleClient, '_get_conn', side_effect=mock_get_conn):

                client = SimpleClient(hosts='kafka01:9092,kafka02:9092')
                resp = client._send_broker_unaware_request(payloads=['fake request'],
                                                           encoder_fn=MagicMock(),
                                                           decoder_fn=lambda x: x)

                self.assertEqual('valid response', resp)
                mocked_conns[('kafka02', 9092)].recv.assert_called_once_with()

class KafkaIntegrationTestCase(unittest.TestCase):
    create_client = True
    topic = None
    zk = None
    server = None

    def setUp(self):
        super(KafkaIntegrationTestCase, self).setUp()
        if not os.environ.get('KAFKA_VERSION'):
            self.skipTest('Integration test requires KAFKA_VERSION')

        if not self.topic:
            topic = "%s-%s" % (self.id()[self.id().rindex(".") + 1:], random_string(10))
            self.topic = topic

        if self.create_client:
            self.client = SimpleClient('%s:%d' % (self.server.host, self.server.port))

        self.client.ensure_topic_exists(self.topic)

        self._messages = {}

    def tearDown(self):
        super(KafkaIntegrationTestCase, self).tearDown()
        if not os.environ.get('KAFKA_VERSION'):
            return

        if self.create_client:
            self.client.close()

    def current_offset(self, topic, partition):
        try:
            offsets, = self.client.send_offset_request([OffsetRequestPayload(topic, partition, -1, 1)])
        except:
            # XXX: We've seen some UnknownErrors here and cant debug w/o server logs
            self.zk.child.dump_logs()
            self.server.child.dump_logs()
            raise
        else:
            return offsets.offsets[0]

    def msgs(self, iterable):
        return [ self.msg(x) for x in iterable ]

    def msg(self, s):
        if s not in self._messages:
            self._messages[s] = '%s-%s-%s' % (s, self.id(), str(uuid.uuid4()))

        return self._messages[s].encode('utf-8')

    def key(self, k):
        return k.encode('utf-8')

    def test_send_produce_request_raises_when_topic_unknown(self, protocol, conn):

        mock_conn(conn)

        brokers = [BrokerMetadata(0, "broker_1", 4567, None), BrokerMetadata(1, "broker_2", 5678, None)]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [(UNKNOWN_TOPIC_OR_PARTITION, "topic_doesnt_exist", [])]
        protocol.decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=["broker_1:4567"])

        requests = [ProduceRequestPayload("topic_doesnt_exist", 0, [create_message("a"), create_message("b")])]

        with self.assertRaises(FailedPayloadsError):
            client.send_produce_request(requests)

    def test_ensure_topic_exists(self, decode_metadata_response, conn):

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567, None),
            BrokerMetadata(1, 'broker_2', 5678, None)
        ]
        resp0_brokers = list(map(itemgetter(0, 1, 2), brokers))

        topics = [
            (NO_LEADER, 'topic_still_creating', []),
            (UNKNOWN_TOPIC_OR_PARTITION, 'topic_doesnt_exist', []),
            (NO_ERROR, 'topic_noleaders', [
                (NO_LEADER, 0, -1, [], []),
                (NO_LEADER, 1, -1, [], []),
            ]),
        ]
        decode_metadata_response.return_value = MetadataResponse[0](resp0_brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        with self.assertRaises(UnknownTopicOrPartitionError):
            client.ensure_topic_exists('topic_doesnt_exist', timeout=1)

        with self.assertRaises(KafkaTimeoutError):
            client.ensure_topic_exists('topic_still_creating', timeout=1)

        # This should not raise
        client.ensure_topic_exists('topic_noleaders', timeout=1)

    def test_get_leader_exceptions_when_noleader(self, protocol, conn):

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567),
            BrokerMetadata(1, 'broker_2', 5678)
        ]

        topics = [
            (NO_ERROR, 'topic_noleader', [
                (NO_LEADER, 0, -1, [], []),
                (NO_LEADER, 1, -1, [], []),
            ]),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse(brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])
        self.assertDictEqual(
            {
                TopicPartition('topic_noleader', 0): None,
                TopicPartition('topic_noleader', 1): None
            },
            client.topics_to_brokers)

        # No leader partitions -- raise LeaderNotAvailableError
        with self.assertRaises(LeaderNotAvailableError):
            self.assertIsNone(client._get_leader_for_partition('topic_noleader', 0))
        with self.assertRaises(LeaderNotAvailableError):
            self.assertIsNone(client._get_leader_for_partition('topic_noleader', 1))

        # Unknown partitions -- raise UnknownTopicOrPartitionError
        with self.assertRaises(UnknownTopicOrPartitionError):
            self.assertIsNone(client._get_leader_for_partition('topic_noleader', 2))

        topics = [
            (NO_ERROR, 'topic_noleader', [
                (NO_ERROR, 0, 0, [0, 1], [0, 1]),
                (NO_ERROR, 1, 1, [1, 0], [1, 0])
            ]),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse(brokers, topics)
        self.assertEqual(brokers[0], client._get_leader_for_partition('topic_noleader', 0))
        self.assertEqual(brokers[1], client._get_leader_for_partition('topic_noleader', 1))

    def test_send_produce_request_raises_when_topic_unknown(self, protocol, conn):

        mock_conn(conn)

        brokers = [
            BrokerMetadata(0, 'broker_1', 4567),
            BrokerMetadata(1, 'broker_2', 5678)
        ]

        topics = [
            (UNKNOWN_TOPIC_OR_PARTITION, 'topic_doesnt_exist', []),
        ]
        protocol.decode_metadata_response.return_value = MetadataResponse(brokers, topics)

        client = SimpleClient(hosts=['broker_1:4567'])

        requests = [ProduceRequestPayload(
            "topic_doesnt_exist", 0,
            [create_message("a"), create_message("b")])]

        with self.assertRaises(UnknownTopicOrPartitionError):
            client.send_produce_request(requests)

    def test_send_broker_unaware_request_fail(self, load_metadata, conn):
        mocked_conns = {
            ('kafka01', 9092): MagicMock(),
            ('kafka02', 9092): MagicMock()
        }
        for val in mocked_conns.values():
            mock_conn(val, success=False)

        def mock_get_conn(host, port, afi):
            return mocked_conns[(host, port)]
        conn.side_effect = mock_get_conn

        client = SimpleClient(hosts=['kafka01:9092', 'kafka02:9092'])

        req = KafkaProtocol.encode_metadata_request()
        with self.assertRaises(KafkaUnavailableError):
            client._send_broker_unaware_request(payloads=['fake request'],
                                                encoder_fn=MagicMock(return_value='fake encoded message'),
                                                decoder_fn=lambda x: x)

        for key, conn in six.iteritems(mocked_conns):
            conn.send.assert_called_with('fake encoded message')