【HAVENT原创】KOA2 异常处理

红太狼 2022-10-01 14:00 208阅读 0赞

[为什么80%的码农都做不了架构师？>>> ][80_] ![hot3.png][]

KOA2 全局异常处理，首先在顶部引入下面的 错误捕捉中间件，然后在底部引用 NodeJS 未捕获异常拦截 即可。

注意：一般情况 错误捕捉中间件 就能完整基本的错误拦截，但是在引发未捕获异常时必须先用 NodeJS 未捕获异常拦截 之后才能捕获异常，否则会直接抛出异常，导致程序崩溃！

### 错误捕捉中间件: ###

/**
     * 错误捕捉中间件
     */
    app.use(async(ctx, next) => {
        try {
            ctx.error = (code, message) => {
                console.log('threw error');
                if (typeof code === 'string') {
                    message = code;
                    code = 500;
                }
    
                ctx.throw(code || 500, message || '服务器错误');
            };
    
            await next();
        } catch (e) {
            let status = e.status || 500;
            let message = e.message || '服务器错误';
            ctx.body = { status, message };
    
            // 手动释放 error 事件
            ctx.app.emit('error', e, ctx);
        }
    });

### NodeJS 未捕获异常拦截: ###

process.on('uncaughtException', function (err) {
        console.error('An uncaught error occurred!');
        //console.error(err.stack);
        console.log(new Date(), " uncaughtException:", err.message, err.status);
    });

### 抛出异常语法: ###

// ctx 环境变量
        // statusCode http错误码，错误码是有限制的，无效的错误码会被替换为500，错误码请看附录
        // message 异常描述，可选
        // param 异常携带的参数， 可选
        ctx.throw(statusCode [, message], [param])

## 附录： ##

<table> 
 <tbody> 
  <tr> 
   <th>Status Code</th> 
   <th>Constructor Name</th> 
  </tr> 
 </tbody> 
 <tbody> 
  <tr> 
   <td>400</td> 
   <td>BadRequest</td> 
  </tr> 
  <tr> 
   <td>401</td> 
   <td>Unauthorized</td> 
  </tr> 
  <tr> 
   <td>402</td> 
   <td>PaymentRequired</td> 
  </tr> 
  <tr> 
   <td>403</td> 
   <td>Forbidden</td> 
  </tr> 
  <tr> 
   <td>404</td> 
   <td>NotFound</td> 
  </tr> 
  <tr> 
   <td>405</td> 
   <td>MethodNotAllowed</td> 
  </tr> 
  <tr> 
   <td>406</td> 
   <td>NotAcceptable</td> 
  </tr> 
  <tr> 
   <td>407</td> 
   <td>ProxyAuthenticationRequired</td> 
  </tr> 
  <tr> 
   <td>408</td> 
   <td>RequestTimeout</td> 
  </tr> 
  <tr> 
   <td>409</td> 
   <td>Conflict</td> 
  </tr> 
  <tr> 
   <td>410</td> 
   <td>Gone</td> 
  </tr> 
  <tr> 
   <td>411</td> 
   <td>LengthRequired</td> 
  </tr> 
  <tr> 
   <td>412</td> 
   <td>PreconditionFailed</td> 
  </tr> 
  <tr> 
   <td>413</td> 
   <td>PayloadTooLarge</td> 
  </tr> 
  <tr> 
   <td>414</td> 
   <td>URITooLong</td> 
  </tr> 
  <tr> 
   <td>415</td> 
   <td>UnsupportedMediaType</td> 
  </tr> 
  <tr> 
   <td>416</td> 
   <td>RangeNotSatisfiable</td> 
  </tr> 
  <tr> 
   <td>417</td> 
   <td>ExpectationFailed</td> 
  </tr> 
  <tr> 
   <td>418</td> 
   <td>ImATeapot</td> 
  </tr> 
  <tr> 
   <td>421</td> 
   <td>MisdirectedRequest</td> 
  </tr> 
  <tr> 
   <td>422</td> 
   <td>UnprocessableEntity</td> 
  </tr> 
  <tr> 
   <td>423</td> 
   <td>Locked</td> 
  </tr> 
  <tr> 
   <td>424</td> 
   <td>FailedDependency</td> 
  </tr> 
  <tr> 
   <td>425</td> 
   <td>UnorderedCollection</td> 
  </tr> 
  <tr> 
   <td>426</td> 
   <td>UpgradeRequired</td> 
  </tr> 
  <tr> 
   <td>428</td> 
   <td>PreconditionRequired</td> 
  </tr> 
  <tr> 
   <td>429</td> 
   <td>TooManyRequests</td> 
  </tr> 
  <tr> 
   <td>431</td> 
   <td>RequestHeaderFieldsTooLarge</td> 
  </tr> 
  <tr> 
   <td>451</td> 
   <td>UnavailableForLegalReasons</td> 
  </tr> 
  <tr> 
   <td>500</td> 
   <td>InternalServerError</td> 
  </tr> 
  <tr> 
   <td>501</td> 
   <td>NotImplemented</td> 
  </tr> 
  <tr> 
   <td>502</td> 
   <td>BadGateway</td> 
  </tr> 
  <tr> 
   <td>503</td> 
   <td>ServiceUnavailable</td> 
  </tr> 
  <tr> 
   <td>504</td> 
   <td>GatewayTimeout</td> 
  </tr> 
  <tr> 
   <td>505</td> 
   <td>HTTPVersionNotSupported</td> 
  </tr> 
  <tr> 
   <td>506</td> 
   <td>VariantAlsoNegotiates</td> 
  </tr> 
  <tr> 
   <td>507</td> 
   <td>InsufficientStorage</td> 
  </tr> 
  <tr> 
   <td>508</td> 
   <td>LoopDetected</td> 
  </tr> 
  <tr> 
   <td>509</td> 
   <td>BandwidthLimitExceeded</td> 
  </tr> 
  <tr> 
   <td>510</td> 
   <td>NotExtended</td> 
  </tr> 
  <tr> 
   <td>511</td> 
   <td>NetworkAuthenticationRequired</td> 
  </tr> 
 </tbody> 
</table>

转载于:https://my.oschina.net/u/943746/blog/2055490

[80_]: https://my.oschina.net/u/2663968/blog/3051541
[hot3.png]: /images/20220118/f928ebb65a6546b58ea0e79efc359da3.png