mysql数据库binlog解析回调中间件的实现

由于原始代码已经提供了解析binlog的核心函数，以下是一个简化的示例，展示如何注册和调用回调函数来处理binlog事件。

import pymysql
from pymysqlreplication import BinLogStreamReader
from pymysqlreplication.row_event import (
    DeleteRowsEvent,
    UpdateRowsEvent,
    WriteRowsEvent,
)
 
# 回调函数示例
def handle_event(event):
    if isinstance(event, WriteRowsEvent):
        for row in event.rows:
            print("插入行:", row["values"])
    elif isinstance(event, UpdateRowsEvent):
        for row in event.rows:
            print("更新前行:", row["before_values"])
            print("更新后行:", row["after_values"])
    elif isinstance(event, DeleteRowsEvent):
        for row in event.rows:
            print("删除行:", row["values"])
 
# 连接MySQL数据库
conn = pymysql.connect(host='localhost', user='your_username', password='your_password', charset='utf8mb4')
 
# 创建binlog流读取器
stream = BinLogStreamReader(
    connection_settings = conn.settings_dict(),
    server_id = 100,
    log_file = 'mysql-bin.000001',
    resume_stream = True,
    only_schemas = ['your_database'],
    ignored_events = (),
)
 
# 注册回调函数
stream.register_callback(handle_event, only_events=[DeleteRowsEvent, UpdateRowsEvent, WriteRowsEvent])
 
# 读取binlog流
for binlog_event in stream:
    pass
 
# 关闭流和连接
stream.close()
conn.close()

这个示例展示了如何连接到MySQL数据库，创建一个BinLogStreamReader实例，注册一个处理binlog事件的回调函数，并开始读取和处理binlog流。在实际应用中，你需要替换your_username、your_password和your_database为你的实际数据库用户名、密码和数据库名。