C++ Actor库orca简介（三）：orca错误处理

灰太狼 2021-04-25 15:41 483阅读 0赞

项目地址：[https://github.com/wlgq2/orca][https_github.com_wlgq2_orca]

orca中定义一套错误号码及提示信息以及断言，当程序发生错误时候，会输出错误信息或者终止程序。  
在orca/base/error/ErrorInfo.h中可以到错误号码的定义如下：

namespace orca
    {
    namespace base
    {
    class ErrorInfo
    {
    public:
        enum ErrorId
        {
            UVWriteFail = -2048,
            UVConnectFail,
            UVDisconnectFromServer,
            UVSigPipe,
    
            UndefinedError = -1024,
            NoFindActorName,
            ActorNameTooLong,
            NoFindActorAddr,
            ReDefineActorName,
            MessagePackNull,
            PackMessageError,
            NoFindRemoteFramework,
    
            RepeatedRemoteFrameworkID,
        };
        ErrorInfo(ErrorId id,std::string info);
    
        ErrorId getErrorId();
        std::string& getErrorInfo();
    
    private:
        ErrorId id_;
        std::string info_;
    };
    }
    }

orca的错误处理函数如下：

void error(ErrorInfo info)
        {
            if (handle_)
                handle_(info);
            else
                std::cerr << "error id "<< info.getErrorId() << ":" << info.getErrorInfo() << std::endl;
        }

如果用户没有自定义错误处理回调，orca只会cerr错误，否则会运行用户注册错误回调函数。  
orca中通过RegisterErrorHandle接口来注册错误回调函数。  
一个完整的例子：

#include <iostream>
    #include <orca/orca.h>
    
                                                        
    REGISTER_MESSAGE_TYPE(std::string);
    
    void errorHandle(orca::base::ErrorInfo info)
    {
        std::cout << "error id : " << info.getErrorId() << std::endl;
        std::cout << "error message: " << info.getErrorInfo() << std::endl;
    }
    
    int main(int argc, char** args)
    {
        //actor framework.
        orca::Framework framework;
    
        framework.RegisterErrorHandle(std::bind(&errorHandle,std::placeholders::_1));
    
        orca::base::ErrorHandle::Instance()->error(orca::base::ErrorInfo::UndefinedError,"undefine error");
        framework.loop();
    
    }

此外，orca简单的封装了断言用于打印信息并终止错误程序。在orca/core/Assert.h文件中，代码如下：

class Assert
    {
    public:
        static void IsFail(bool nomal, const char* const file, const unsigned int line, const std::string message = "")
        {
            if (!nomal)
            {
                Fail(file,line,message);
            }
        }
    
        static void Fail(const char* const file, const unsigned int line, const std::string message  = "")
        {
            std::cerr<<"fail in :"<<file<<" at "<<line<<" lines.";
            if ("" != message)
            {
                std::cerr<<"\n:" << message;
            }
    
            std::cerr << "\n";
            assert(false);
        }
    };

通过相关宏定义使用，可以输出异常在代码中的发生位置：

#define ORCA_FAIL()                               orca::Assert::Fail(__FILE__, __LINE__)
    #define ORCA_FAIL_MSG(msg)                        orca::Assert::Fail(__FILE__, __LINE__, msg)
    #define ORCA_ASSERT(condition)                    orca::Assert::IsFail(condition,__FILE__, __LINE__)
    #define ORCA_ASSERT_MSG(condition, msg)           orca::Assert::IsFail(condition,__FILE__, __LINE__,msg)

[https_github.com_wlgq2_orca]: https://github.com/wlgq2/orca