Django 实现Canal 读取 MySQL 写入到 Kafka中

安装canal-python库：

pip install canal-python

修改settings.py 文件，添加Canal相关配置

CANAL_SETTINGS = {
    "canal_host": "127.0.0.1",
    "canal_port": 11111,
    "canal_username": "",
    "canal_password": "",
    "canal_destination": "example",
    "canal_filter": ".*\\..*",
}
#  其中，canal_host、canal_port、canal_username、canal_password是Canal服务器的相关配置信息；canal_destination是要同步的数据库的名称；canal_filter是要同步的表的名称，可以使用正则表达式匹配多个表。

在Django中创建一个canal.py文件，添加以下代码

from django.conf import settings
from canal.client import Client
from kafka import KafkaProducer

producer = KafkaProducer(bootstrap_servers=settings.KAFKA_BOOTSTRAP_SERVERS)

def message_handler(message):
    # 将同步的数据发送到Kafka中
    producer.send("example", message['data'])

def start_canal():
    # 连接Canal服务器
    client = Client()
    client.connect(host=settings.CANAL_SETTINGS["canal_host"],
                   port=settings.CANAL_SETTINGS["canal_port"],
                   username=settings.CANAL_SETTINGS["canal_username"],
                   password=settings.CANAL_SETTINGS["canal_password"])
    # 订阅binlog日志
    client.subscribe(
        destination=settings.CANAL_SETTINGS["canal_destination"],
        filter=settings.CANAL_SETTINGS["canal_filter"]
    )
    # 处理同步的数据
    while True:
        message = client.get(1)
        for entry in message['entries']:
            if entry.entryType == "ROWDATA":
                for rowChange in entry.rowChanges:
                    if rowChange.eventType == "INSERT" or rowChange.eventType == "UPDATE":
                        message_handler(rowChange)
    # 关闭Canal连接
    client.disconnect()

在Django的启动文件中（例如manage.py）中添加以下代码：

from canal import start_canal

if __name__ == '__main__':
    start_canal()

需要注意的是，为了确保Canal和Kafka的正常运行，需要在Django的环境中安装canal-python和kafka-python库，并在settings.py文件中添加Kafka的相关配置信息。