chenBright opened a new issue, #2134:
URL: https://github.com/apache/brpc/issues/2134
**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
某些场景下（机器cpu负载高、服务启动时需要预热限制请求量），上层业务希望有能力进行访问控制，在ProcessXXXRequest中拒绝请求，不让请求走到回调方法中。
**Describe the solution you'd like (描述你期望的解决方法)**
提供一个Interceptor基类，用户继承该基类，并实现accept方法。
```c++
class Interceptor {
public:
virtual bool Accept(
const Controller* cntl,
int& error_code,
std::string& error_txt) const { return true; }
virtual ~Interceptor() {}
};
```
提供全局的注册函数用于注册拦截器。
```c++
int RegisterInterceptor(Interceptor* interceptor);
```
在设置完method后调用用户注册的拦截器，用户根据controller的信息来判断是否拦截。
https://github.com/apache/brpc/blob/d587bd10d84f397bc099e41a07826ddc7de55ab5/src/brpc/policy/baidu_rpc_protocol.cpp#L462-L464
**Describe alternatives you've considered (描述你想到的折衷方案)**
**Additional context/screenshots (更多上下文/截图)**
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