diff options
Diffstat (limited to 'kafka/protocol.py')
| -rw-r--r-- | kafka/protocol.py | 42 |
1 files changed, 30 insertions, 12 deletions
diff --git a/kafka/protocol.py b/kafka/protocol.py index 7ec7946..58661c7 100644 --- a/kafka/protocol.py +++ b/kafka/protocol.py @@ -9,7 +9,8 @@ from kafka.common import ( BrokerMetadata, PartitionMetadata, Message, OffsetAndMessage, ProduceResponse, FetchResponse, OffsetResponse, OffsetCommitResponse, OffsetFetchResponse, ProtocolError, - BufferUnderflowError, ChecksumError, ConsumerFetchSizeTooSmall + BufferUnderflowError, ChecksumError, ConsumerFetchSizeTooSmall, + UnsupportedCodecError ) from kafka.util import ( read_short_string, read_int_string, relative_unpack, @@ -18,6 +19,12 @@ from kafka.util import ( log = logging.getLogger("kafka") +ATTRIBUTE_CODEC_MASK = 0x03 +CODEC_NONE = 0x00 +CODEC_GZIP = 0x01 +CODEC_SNAPPY = 0x02 +ALL_CODECS = (CODEC_NONE, CODEC_GZIP, CODEC_SNAPPY) + class KafkaProtocol(object): """ @@ -32,11 +39,6 @@ class KafkaProtocol(object): OFFSET_COMMIT_KEY = 8 OFFSET_FETCH_KEY = 9 - ATTRIBUTE_CODEC_MASK = 0x03 - CODEC_NONE = 0x00 - CODEC_GZIP = 0x01 - CODEC_SNAPPY = 0x02 - ################### # Private API # ################### @@ -150,17 +152,17 @@ class KafkaProtocol(object): (key, cur) = read_int_string(data, cur) (value, cur) = read_int_string(data, cur) - codec = att & KafkaProtocol.ATTRIBUTE_CODEC_MASK + codec = att & ATTRIBUTE_CODEC_MASK - if codec == KafkaProtocol.CODEC_NONE: + if codec == CODEC_NONE: yield (offset, Message(magic, att, key, value)) - elif codec == KafkaProtocol.CODEC_GZIP: + elif codec == CODEC_GZIP: gz = gzip_decode(value) for (offset, msg) in KafkaProtocol._decode_message_set_iter(gz): yield (offset, msg) - elif codec == KafkaProtocol.CODEC_SNAPPY: + elif codec == CODEC_SNAPPY: snp = snappy_decode(value) for (offset, msg) in KafkaProtocol._decode_message_set_iter(snp): yield (offset, msg) @@ -543,7 +545,7 @@ def create_gzip_message(payloads, key=None): [create_message(payload) for payload in payloads]) gzipped = gzip_encode(message_set) - codec = KafkaProtocol.ATTRIBUTE_CODEC_MASK & KafkaProtocol.CODEC_GZIP + codec = ATTRIBUTE_CODEC_MASK & CODEC_GZIP return Message(0, 0x00 | codec, key, gzipped) @@ -564,6 +566,22 @@ def create_snappy_message(payloads, key=None): [create_message(payload) for payload in payloads]) snapped = snappy_encode(message_set) - codec = KafkaProtocol.ATTRIBUTE_CODEC_MASK & KafkaProtocol.CODEC_SNAPPY + codec = ATTRIBUTE_CODEC_MASK & CODEC_SNAPPY return Message(0, 0x00 | codec, key, snapped) + + +def create_message_set(messages, codec=CODEC_NONE): + """Create a message set using the given codec. + + If codec is CODEC_NONE, return a list of raw Kafka messages. Otherwise, + return a list containing a single codec-encoded message. + """ + if codec == CODEC_NONE: + return [create_message(m) for m in messages] + elif codec == CODEC_GZIP: + return [create_gzip_message(messages)] + elif codec == CODEC_SNAPPY: + return [create_snappy_message(messages)] + else: + raise UnsupportedCodecError("Codec 0x%02x unsupported" % codec) |