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Example code of xingwenge/canal_php

Informations about the package canal_php

canal-php

一.canal-php 简介

canal-php 是阿里巴巴开源项目 Canal是阿里巴巴mysql数据库binlog的增量订阅&消费组件 的 php 客户端。为 php 开发者提供一个更友好的使用 Canal 的方式。Canal 是mysql数据库binlog的增量订阅&消费组件。

基于日志增量订阅&消费支持的业务：

  1. 数据库镜像
  2. 数据库实时备份
  3. 多级索引 (卖家和买家各自分库索引)
  4. search build
  5. 业务cache刷新
  6. 价格变化等重要业务消息

关于 Canal 的更多信息请访问 https://github.com/alibaba/canal/wiki

二.应用场景

canal-php 作为Canal的客户端，其应用场景就是Canal的应用场景。关于应用场景在Canal介绍一节已有概述。举一些实际的使用例子：

1.代替使用轮询数据库方式来监控数据库变更，有效改善轮询耗费数据库资源。

2.根据数据库的变更实时更新搜索引擎，比如电商场景下商品信息发生变更，实时同步到商品搜索引擎 Elasticsearch、solr等

3.根据数据库的变更实时更新缓存，比如电商场景下商品价格、库存发生变更实时同步到redis

4.数据库异地备份、数据同步

5.根据数据库变更触发某种业务，比如电商场景下，创建订单超过xx时间未支付被自动取消，我们获取到这条订单数据的状态变更即可向用户推送消息。

6.将数据库变更整理成自己的数据格式发送到kafka等消息队列，供消息队列的消费者进行消费。

三.工作原理

canal-php 是 Canal 的 php 客户端，它与 Canal 是采用的Socket来进行通信的，传输协议是TCP，交互协议采用的是 Google Protocol Buffer 3.0。

四.工作流程

1.Canal连接到mysql数据库，模拟slave

2.canal-php 与 Canal 建立连接

3.数据库发生变更写入到binlog

4.Canal向数据库发送dump请求，获取binlog并解析

5.canal-php 向 Canal 请求数据库变更

6.Canal 发送解析后的数据给canal-php

7.canal-php收到数据，消费成功，发送回执。（可选）

8.Canal记录消费位置。

五.快速启动

安装Canal

Canal 的安装以及配置使用请查看 https://github.com/alibaba/canal/wiki/QuickStart

构建canal php客户端

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建立与Canal的连接

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更多详情请查看 Sample

性能

本地开发环境

消费速度：sql insert 10000 事件，32秒消耗完成。消费速度 312.5 条/s。

内存使用：4 M。

All versions of canal_php with dependencies

PHP Build Version
Package Version
Requires google/protobuf Version ^3.8
php Version >=5.6
clue/socket-raw Version ^1.4
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