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为什么要使用
MySQL-Proxy
呢？
MySQL-Proxy
能带来什么样的好处？我们先来看一下正常的
MySQL
通信流程：
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很显然，我们可以在这些流程中间加入一个中间人，由它来将这些请求转发，接下来我们看一下如果加入一个中间人（
MySQL-Proxy
）的情况下，流程会变成什么样子，以及这种变化会带给我们什么样的好处。
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上图中红线部分都表示
MySQL-Proxy
可能篡改的地方。而
proxy_xxx
方法表示
MySQL-Proxy
可以拦截并提供给使用者进行篡改的途径。事实上
MySQL-Proxy
使用了
LUA
来作为它的胶水语言，同时提供了
connect_server,
read_handshake, read_auth, read_authresult, read_query, read_query_result,
disconnect_client
几种方法，分别对应上图中
proxy_xxx
的方法，如果
lua
的脚本里没有提供这些方法的话，那么就会采用
proxy_xxx
里定义默认实现。
那么为什么
MySQL-Proxy
采用
LUA
来作为胶水语言呢？因为
LUA
语言本身从设计上就是一个支持扩展性，并且使用简单，效率极高同时支持多种平台的语言。
本文介绍了MySQL-Proxy的作用及其带来的好处。通过对比MySQL正常通信流程与引入MySQL-Proxy后的流程，阐述了MySQL-Proxy如何利用Lua脚本进行请求和响应的篡改。
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