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。