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#pylint: skip-file
import struct
import pytest
import six
from kafka.protocol.api import RequestHeader
from kafka.protocol.commit import GroupCoordinatorRequest
from kafka.protocol.message import Message, MessageSet
def test_create_message():
payload = b'test'
key = b'key'
msg = Message(payload, key=key)
assert msg.magic == 0
assert msg.attributes == 0
assert msg.key == key
assert msg.value == payload
def test_encode_message_v0():
message = Message(b'test', key=b'key')
encoded = message.encode()
expect = b''.join([
struct.pack('>i', -1427009701), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 3), # Length of key
b'key', # key
struct.pack('>i', 4), # Length of value
b'test', # value
])
assert encoded == expect
def test_encode_message_v1():
message = Message(b'test', key=b'key', magic=1, timestamp=1234)
encoded = message.encode()
expect = b''.join([
struct.pack('>i', 1331087195), # CRC
struct.pack('>bb', 1, 0), # Magic, flags
struct.pack('>q', 1234), # Timestamp
struct.pack('>i', 3), # Length of key
b'key', # key
struct.pack('>i', 4), # Length of value
b'test', # value
])
assert encoded == expect
def test_decode_message():
encoded = b''.join([
struct.pack('>i', -1427009701), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 3), # Length of key
b'key', # key
struct.pack('>i', 4), # Length of value
b'test', # value
])
decoded_message = Message.decode(encoded)
msg = Message(b'test', key=b'key')
msg.encode() # crc is recalculated during encoding
assert decoded_message == msg
def test_encode_message_set():
messages = [
Message(b'v1', key=b'k1'),
Message(b'v2', key=b'k2')
]
encoded = MessageSet.encode([(0, msg.encode())
for msg in messages],
size=False)
expect = b''.join([
struct.pack('>q', 0), # MsgSet Offset
struct.pack('>i', 18), # Msg Size
struct.pack('>i', 1474775406), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 2), # Length of key
b'k1', # Key
struct.pack('>i', 2), # Length of value
b'v1', # Value
struct.pack('>q', 0), # MsgSet Offset
struct.pack('>i', 18), # Msg Size
struct.pack('>i', -16383415), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 2), # Length of key
b'k2', # Key
struct.pack('>i', 2), # Length of value
b'v2', # Value
])
assert encoded == expect
def test_decode_message_set():
encoded = b''.join([
struct.pack('>q', 0), # MsgSet Offset
struct.pack('>i', 18), # Msg Size
struct.pack('>i', 1474775406), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 2), # Length of key
b'k1', # Key
struct.pack('>i', 2), # Length of value
b'v1', # Value
struct.pack('>q', 1), # MsgSet Offset
struct.pack('>i', 18), # Msg Size
struct.pack('>i', -16383415), # CRC
struct.pack('>bb', 0, 0), # Magic, flags
struct.pack('>i', 2), # Length of key
b'k2', # Key
struct.pack('>i', 2), # Length of value
b'v2', # Value
])
msgs = MessageSet.decode(encoded, bytes_to_read=len(encoded))
assert len(msgs) == 2
msg1, msg2 = msgs
returned_offset1, message1_size, decoded_message1 = msg1
returned_offset2, message2_size, decoded_message2 = msg2
assert returned_offset1 == 0
message1 = Message(b'v1', key=b'k1')
message1.encode()
assert decoded_message1 == message1
assert returned_offset2 == 1
message2 = Message(b'v2', key=b'k2')
message2.encode()
assert decoded_message2 == message2
def test_encode_message_header():
expect = b''.join([
struct.pack('>h', 10), # API Key
struct.pack('>h', 0), # API Version
struct.pack('>i', 4), # Correlation Id
struct.pack('>h', len('client3')), # Length of clientId
b'client3', # ClientId
])
req = GroupCoordinatorRequest[0]('foo')
header = RequestHeader(req, correlation_id=4, client_id='client3')
assert header.encode() == expect
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