使用python消费canal protobuf格式数据

canal -> kafka -> consumer. flatMessage=False
参考 canal Python客户端.
由于canal Python客户端是作为canal的client直连canal 11111端口消费数据而非消费kafka数据, 所以example不能照搬, 需要做一些修改

Python3.7.4

requriments

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backcall==0.1.0
bleach==3.1.0
canal-python==0.4
certifi==2019.6.16
chardet==3.0.4
confluent-kafka==1.3.0
decorator==4.4.2
docopt==0.6.2
docutils==0.15.2
idna==2.8
ipython==7.13.0
ipython-genutils==0.2.0
jedi==0.16.0
parso==0.6.2
pexpect==4.8.0
pickleshare==0.7.5
pkginfo==1.5.0.1
prompt-toolkit==3.0.4
protobuf==3.9.1
ptyprocess==0.6.0
Pygments==2.4.2
readme-renderer==24.0
requests==2.22.0
requests-toolbelt==0.9.1
six==1.12.0
tqdm==4.34.0
traitlets==4.3.3
twine==1.13.0
urllib3==1.25.3
wcwidth==0.1.8
webencodings==0.5.1

主要参考

https://github.com/haozi3156666/canal-python/blob/master/canal/client.py

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# -*- coding: utf8 -*-
# __author__ = 'Fan()'
# Date: 2020-03-18
'''
Usage:
canal_kafka_protobuf_consume.py --bootstrap-servers=<host:port,host2:port2..> [--k_user=<user> ] [--from-beginning=<false> | --from-end=<false>] --topic=<topic_name> [--partition=<partition_number>] [--verbose=<0>]
canal_kafka_protobuf_consume.py -h | --help
canal_kafka_protobuf_consume.py --version
Options:
-h --help 打印帮助信息.
--version 版本信息.
--bootstrap_servers=<host:port,host2:port2..> kafka servers
--from-beginning=<false> 从头开始消费 [default: False]
--from-end=<false> 从最后开始消费 [default: True]
--k_user=<user> kafka用户, 可选项
--topic=<topic_name> topic名称
--partition=<partition_number> topic分区号 [default: 0]
--verbose=<0> 输出详细信息0,1,2 默认0不输出 [default: 0]
'''
import getpass
from docopt import docopt
from canal.protocol import CanalProtocol_pb2
from canal.protocol import EntryProtocol_pb2
from confluent_kafka import Consumer, KafkaError, TopicPartition, OFFSET_END, OFFSET_BEGINNING
class DocOptArgs:
def __init__(self, args):
self.topic = args['--topic']
self.k_user = args['--k_user']
self.verbose = int(args['--verbose'])
self.partition = int(args['--partition'])
self.bootstrap_servers = args['--bootstrap-servers']
self.from_end = eval(args['--from-end'].capitalize())
self.from_beginning = eval(args['--from-beginning'].capitalize())
if not self.k_user:
self.k_password = None
elif self.k_user == 'admin':
self.k_password = 'superSecurt'
else:
self.k_password = getpass.getpass("please enter kafka password: ")
class MyConsumer(DocOptArgs):
def __init__(self, docopt_args):
self.args = docopt_args
DocOptArgs.__init__(self, self.args)
if self.verbose >= 1:
print(self.args)
def _on_send_response(self, err, partations):
pt = partations[0]
if isinstance(err, KafkaError):
print('Topic {} 偏移量 {} 提交异常. {}'.format(pt.topic, pt.offset, err))
raise Exception(err)
def messages(self, offset_end=True):
config = {'bootstrap.servers': self.bootstrap_servers,
"group.id": self.topic,
'enable.auto.commit': True,
"fetch.wait.max.ms": 3000,
"max.poll.interval.ms": 60000,
'session.timeout.ms': 60000,
"on_commit": self._on_send_response,
"default.topic.config": {"auto.offset.reset": "latest"}}
if self.k_user and self.k_password:
config['security.protocol'] = 'SASL_PLAINTEXT'
config['sasl.mechanism'] = 'SCRAM-SHA-256'
config['sasl.username'] = self.k_user
config['sasl.password'] = self.k_password
consumer = Consumer(config)
offset = OFFSET_END if offset_end else OFFSET_BEGINNING
pt = TopicPartition(self.topic, 0, offset)
consumer.assign([pt])
# consumer.seek(pt)
try:
while True:
ret = consumer.consume(num_messages=100, timeout=0.1)
if ret is None:
print("No message Continue!")
continue
for msg in ret:
if msg.error() is None:
# protobuf binary
yield msg.value()
elif msg.error():
if msg.error().code() == KafkaError._PARTITION_EOF:
continue
else:
raise Exception(msg.error())
except Exception as e:
print(e)
consumer.close()
except KeyboardInterrupt:
consumer.close()
class Decoder:
@staticmethod
def create_canal_message(kafka_message):
data = kafka_message
packet = CanalProtocol_pb2.Packet()
packet.MergeFromString(data)
message = dict(id=0, entries=[])
# 因为从kafka获取的canal写入的消息, 所以这个条件应该永远成立
# if packet.type == CanalProtocol_pb2.PacketType.MESSAGES:
messages = CanalProtocol_pb2.Messages()
messages.MergeFromString(packet.body)
for item in messages.messages:
entry = EntryProtocol_pb2.Entry()
entry.MergeFromString(item)
message['entries'].append(entry)
return message
if __name__ == '__main__':
version = 'canal_kafka_protobuf_consume 0.1.0'
arguments = docopt(__doc__, version=version)
consumer = MyConsumer(arguments)
for message in consumer.messages():
canal_message = Decoder.create_canal_message(message)
entries = canal_message['entries']
for entry in entries:
entry_type = entry.entryType
if entry_type in [EntryProtocol_pb2.EntryType.TRANSACTIONBEGIN, EntryProtocol_pb2.EntryType.TRANSACTIONEND]:
continue
row_change = EntryProtocol_pb2.RowChange()
row_change.MergeFromString(entry.storeValue)
# event_type = row_change.eventType
header = entry.header
database = header.schemaName
table = header.tableName
binlog_file = header.logfileName
binlog_pos = header.logfileOffset
characterset = header.serverenCode
es = header.executeTime
gtid = header.gtid
event_type = header.eventType
for row in row_change.rowDatas:
format_data = dict()
if event_type == EntryProtocol_pb2.EventType.DELETE:
for column in row.beforeColumns:
format_data.update({
column.name: column.value
})
elif event_type == EntryProtocol_pb2.EventType.INSERT:
for column in row.afterColumns:
format_data.update({
column.name: column.value
})
else:
format_data['before'] = dict()
format_data['after'] = dict()
for column in row.beforeColumns:
format_data['before'][column.name] = column.value
for column in row.afterColumns:
format_data['after'][column.name] = column.value
data = dict(
db=database,
table=table,
event_type=EntryProtocol_pb2.EventType.Name(event_type),
is_ddl=row_change.isDdl,
binlog_file=binlog_file,
binlog_pos=binlog_pos,
characterset=characterset,
es=es,
gtid=header.gtid,
data=format_data,
)
print(data)

使用效果

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#python canal_kafka_protobuf_consume.py --bootstrap-servers=172.16.xx.xx:9092,172.16.xx.xx:9092,172.16.xx.xx:9092 --topic=fanboshi.monitor_delay
{'db': 'fanboshi', 'table': 'monitor_delay', 'event_type': 'INSERT', 'is_ddl': False, 'binlog_file': 'mysql-bin.000006', 'binlog_pos': 469896982, 'characterset': 'UTF-8', 'es': 1584535911000, 'gtid': 'c30c6a02-4e32-11ea-84ec-fa163edcd14e:1-2940100', 'data': {'id': '5', 'ctime': '2020-03-18 20:51:51'}}
{'db': 'fanboshi', 'table': 'monitor_delay', 'event_type': 'INSERT', 'is_ddl': False, 'binlog_file': 'mysql-bin.000006', 'binlog_pos': 469897261, 'characterset': 'UTF-8', 'es': 1584535912000, 'gtid': 'c30c6a02-4e32-11ea-84ec-fa163edcd14e:1-2940101', 'data': {'id': '6', 'ctime': '2020-03-18 20:51:52'}}

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