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fetched_batch_generator_spec.rb
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fetched_batch_generator_spec.rb
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# frozen_string_literal: true
describe Kafka::FetchedBatchGenerator do
let(:logger) { LOGGER }
let(:generator) { described_class.new('Hello', fetched_partition, 0, logger: logger) }
context 'empty partition' do
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: []
)
end
it 'returns empty array' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(nil)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages).to eql([])
end
end
context 'legacy message set' do
context 'message set contains messages only after the required offset' do
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::MessageSet.new(
messages: [
Kafka::Protocol::Message.new(
value: 'Hello',
offset: 0
),
Kafka::Protocol::Message.new(
value: 'World',
offset: 1
)
]
),
Kafka::Protocol::MessageSet.new(
messages: [
Kafka::Protocol::Message.new(
value: 'Bye',
offset: 2
)
]
)
]
)
end
it 'returns flatten messages' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(3)
expect_fetched_message_eql(
batch.messages[0], 'Hello', 0,
Kafka::Protocol::Message.new(
value: 'Hello',
offset: 0
)
)
expect_fetched_message_eql(
batch.messages[1], 'Hello', 0,
Kafka::Protocol::Message.new(
value: 'World',
offset: 1
)
)
expect_fetched_message_eql(
batch.messages[2], 'Hello', 0,
Kafka::Protocol::Message.new(
value: 'Bye',
offset: 2
)
)
end
end
context 'message set contains messages with offsets before the required offset' do
let(:generator) { described_class.new('Hello', fetched_partition, 10, logger: logger) }
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::MessageSet.new(
messages: [
Kafka::Protocol::Record.new(
offset: 7,
value: '1234'
),
Kafka::Protocol::Record.new(
offset: 8,
value: '1234'
)
]
),
Kafka::Protocol::MessageSet.new(
messages: [
Kafka::Protocol::Record.new(
offset: 9,
value: '1234'
),
Kafka::Protocol::Record.new(
offset: 10,
value: '1234'
)
]
),
Kafka::Protocol::MessageSet.new(
messages: [
Kafka::Protocol::Record.new(
offset: 11,
value: '1234'
)
]
)
]
)
end
it 'ignores messages less than required offset' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(11)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(2)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, Kafka::Protocol::Record.new(offset: 10, value: '1234'))
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, Kafka::Protocol::Record.new(offset: 11, value: '1234'))
end
end
end
context 'record batch format' do
let(:record_1) { Kafka::Protocol::Record.new(value: 'Hello') }
let(:record_2) { Kafka::Protocol::Record.new(value: 'World') }
let(:record_3) { Kafka::Protocol::Record.new(value: 'Bye') }
context 'no control record' do
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::RecordBatch.new(
first_offset: 9,
last_offset_delta: 1,
records: [
record_1, record_2
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 11,
last_offset_delta: 1,
records: [
record_3
]
)
]
)
end
it 'returns flatten records' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(12)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(3)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, record_1)
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, record_2)
expect_fetched_message_eql(batch.messages[2], 'Hello', 0, record_3)
end
end
context 'including committed control records' do
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::RecordBatch.new(
first_offset: 7,
last_offset_delta: 2,
records: [
record_1,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
),
record_2
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 10,
last_offset_delta: 2,
records: [
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
),
record_3,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
),
]
)
]
)
end
it 'ignores control records' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(12)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(3)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, record_1)
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, record_2)
expect_fetched_message_eql(batch.messages[2], 'Hello', 0, record_3)
end
end
context 'including committed control batch' do
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::RecordBatch.new(
first_offset: 7,
last_offset_delta: 0,
records: [
record_1,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
),
record_2
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 8,
last_offset_delta: 0,
is_control_batch: true,
records: [
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
)
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 9,
last_offset_delta: 0,
records: [
record_3,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
)
]
)
]
)
end
it 'ignores control batches and control records' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(9)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(3)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, record_1)
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, record_2)
expect_fetched_message_eql(batch.messages[2], 'Hello', 0, record_3)
end
end
context 'including aborted control records and aborted transactions' do
let(:record_1) { Kafka::Protocol::Record.new(value: 'Hello', offset: 12) }
let(:record_2) { Kafka::Protocol::Record.new(value: 'World', offset: 13) }
let(:record_3) { Kafka::Protocol::Record.new(value: 'Bye', offset: 14) }
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [
Kafka::Protocol::FetchResponse::AbortedTransaction.new(
producer_id: 5,
first_offset: 16
),
Kafka::Protocol::FetchResponse::AbortedTransaction.new(
producer_id: 5,
first_offset: 10
),
Kafka::Protocol::FetchResponse::AbortedTransaction.new(
producer_id: 7,
first_offset: 15
)
],
messages: [
Kafka::Protocol::RecordBatch.new(
producer_id: 5,
in_transaction: true,
first_offset: 10,
last_offset_delta: 1,
records: [
Kafka::Protocol::Record.new(value: 'Aborted 1', offset: 10),
Kafka::Protocol::Record.new(value: 'Aborted 2', offset: 11)
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 5,
in_transaction: true,
is_control_batch: true,
records: [
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x00",
value: nil
)
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 5,
in_transaction: true,
first_offset: 12,
last_offset_delta: 1,
records: [
record_1,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
),
record_2
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 6,
in_transaction: true,
first_offset: 14,
last_offset_delta: 0,
records: [
record_3,
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x01",
value: nil
)
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 7,
in_transaction: true,
first_offset: 15,
last_offset_delta: 0,
records: [
Kafka::Protocol::Record.new(value: 'Aborted 3', offset: 15)
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 7,
in_transaction: true,
is_control_batch: true,
records: [
Kafka::Protocol::Record.new(
is_control_record: true,
key: "\x00\x00\x00\x00",
value: nil
)
]
),
Kafka::Protocol::RecordBatch.new(
producer_id: 5,
in_transaction: true,
first_offset: 16,
last_offset_delta: 0,
records: [
Kafka::Protocol::Record.new(value: 'Aborted 4', offset: 16)
]
),
]
)
end
it 'ignores control records and aborted records' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(16)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(3)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, record_1)
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, record_2)
expect_fetched_message_eql(batch.messages[2], 'Hello', 0, record_3)
end
end
context 'record batch contains records with offsets smaller than required offset' do
let(:generator) { described_class.new('Hello', fetched_partition, 10, logger: logger) }
let(:fetched_partition) do
Kafka::Protocol::FetchResponse::FetchedPartition.new(
partition: 0,
error_code: 0,
highwater_mark_offset: 1,
last_stable_offset: 1,
aborted_transactions: [],
messages: [
Kafka::Protocol::RecordBatch.new(
first_offset: 7,
last_offset_delta: 0,
records: [
Kafka::Protocol::Record.new(
offset: 7,
value: '1234'
),
Kafka::Protocol::Record.new(
offset: 8,
value: '1234'
)
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 9,
last_offset_delta: 0,
is_control_batch: true,
records: [
Kafka::Protocol::Record.new(
offset: 9,
value: '1234'
),
Kafka::Protocol::Record.new(
offset: 10,
value: '1234'
)
]
),
Kafka::Protocol::RecordBatch.new(
first_offset: 11,
last_offset_delta: 0,
records: [
Kafka::Protocol::Record.new(
offset: 11,
value: '1234'
)
]
)
]
)
end
it 'ignores records less than required offset' do
batch = generator.generate
expect(batch.topic).to eql('Hello')
expect(batch.partition).to eql(0)
expect(batch.last_offset).to eql(11)
expect(batch.highwater_mark_offset).to eql(1)
expect(batch.messages.length).to eql(2)
expect_fetched_message_eql(batch.messages[0], 'Hello', 0, Kafka::Protocol::Record.new(offset: 10, value: '1234'))
expect_fetched_message_eql(batch.messages[1], 'Hello', 0, Kafka::Protocol::Record.new(offset: 11, value: '1234'))
end
end
end
end
def expect_fetched_message_eql(fetched_message, topic, partition, message)
expect(fetched_message.topic).to eql(topic)
expect(fetched_message.partition).to eql(partition)
expect(fetched_message.value).to eql(message.value)
expect(fetched_message.key).to eql(message.key)
expect(fetched_message.offset).to eql(message.offset)
if message.is_a?(Kafka::Protocol::Record)
expect(fetched_message.headers).to eql(message.headers)
expect(fetched_message.is_control_record).to eql(message.is_control_record)
end
end