Lumen开发：Lumen的异常处理机制

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Lumen的核心类Application引用了专门用于异常处理的RegistersExceptionHandlers，

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class Application extends Container {     use Concerns\RoutesRequests,         Concerns\RegistersExceptionHandlers;

直接来看一下这个引用里的方法RegistersExceptionHandlers.php

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<?php   namespace Laravel\Lumen\Concerns;   use Error; use ErrorException; use Symfony\Component\Console\Output\ConsoleOutput; use Symfony\Component\HttpKernel\Exception\HttpException; use Symfony\Component\Debug\Exception\FatalErrorException; use Symfony\Component\Debug\Exception\FatalThrowableError; use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;   trait RegistersExceptionHandlers {     /**      * Throw an HttpException with the given data.（通过给定的数据HttpException。）      *      * @param  int     $code      * @param  string  $message      * @param  array   $headers      * @return void      *      * @throws \Symfony\Component\HttpKernel\Exception\HttpException      */     public function abort($code, $message = '', array $headers = [])     {         if ($code == 404) {             throw new NotFoundHttpException($message);         }           throw new HttpException($code, $message, null, $headers);     }       /**      * Set the error handling for the application.（设置应用程序的错误处理。）      *      * @return void      */     protected function registerErrorHandling()     {         error_reporting(-1);           set_error_handler(function ($level, $message, $file = '', $line = 0) {             if (error_reporting() & $level) {                 throw new ErrorException($message, 0, $level, $file, $line);             }         });           set_exception_handler(function ($e) {             $this->handleUncaughtException($e);         });           register_shutdown_function(function () {             $this->handleShutdown();         });     }       /**      * Handle the application shutdown routine.（处理关闭应用程序。）      *      * @return void      */     protected function handleShutdown()     {         if (! is_null($error = error_get_last()) && $this->isFatalError($error['type'])) {             $this->handleUncaughtException(new FatalErrorException(                 $error['message'], $error['type'], 0, $error['file'], $error['line']             ));         }     }       /**      * Determine if the error type is fatal.（如果确定的错误类型是致命的。）      *      * @param  int  $type      * @return bool      */     protected function isFatalError($type)     {         $errorCodes = [E_ERROR, E_CORE_ERROR, E_COMPILE_ERROR, E_PARSE];           if (defined('FATAL_ERROR')) {             $errorCodes[] = FATAL_ERROR;         }           return in_array($type, $errorCodes);     }       /**      * Send the exception to the handler and return the response.（将异常发送给处理程序并返回响应。）      *      * @param  \Throwable  $e      * @return Response      */     protected function sendExceptionToHandler($e)     {         $handler = $this->resolveExceptionHandler();           if ($e instanceof Error) {             $e = new FatalThrowableError($e);         }           $handler->report($e);           return $handler->render($this->make('request'), $e);     }       /**      * Handle an uncaught exception instance.（处理未捕获的异常情况。）      *      * @param  \Throwable  $e      * @return void      */     protected function handleUncaughtException($e)     {         $handler = $this->resolveExceptionHandler();           if ($e instanceof Error) {             $e = new FatalThrowableError($e);         }           $handler->report($e);           if ($this->runningInConsole()) {             $handler->renderForConsole(new ConsoleOutput, $e);         } else {             $handler->render($this->make('request'), $e)->send();         }     }       /**      * Get the exception handler from the container.（从容器中获取异常处理程序。）      *      * @return mixed      */     protected function resolveExceptionHandler()     {         if ($this->bound('Illuminate\Contracts\Debug\ExceptionHandler')) {             return $this->make('Illuminate\Contracts\Debug\ExceptionHandler');         } else {             return $this->make('Laravel\Lumen\Exceptions\Handler');         }     } }

以上就是封装用于$app的几个异常处理方法了，接下来看一下Lumen对异常处理做的默认绑定，这里的单例绑定是接口绑定类的类型

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$app->singleton(     Illuminate\Contracts\Debug\ExceptionHandler::class,     App\Exceptions\Handler::class );

app/Exceptions/Handler.php

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<?php   namespace App\Exceptions;   use Exception; use Illuminate\Validation\ValidationException; use Illuminate\Auth\Access\AuthorizationException; use Illuminate\Database\Eloquent\ModelNotFoundException; use Laravel\Lumen\Exceptions\Handler as ExceptionHandler; use Symfony\Component\HttpKernel\Exception\HttpException;   class Handler extends ExceptionHandler {     /**      * A list of the exception types that should not be reported.（不应该报告的异常类型的列表。）      *      * @var array      */     protected $dontReport = [         AuthorizationException::class,         HttpException::class,         ModelNotFoundException::class,         ValidationException::class,     ];       /**      * Report or log an exception.（报告或记录异常。）      *      * This is a great spot to send exceptions to Sentry, Bugsnag, etc.      *      * @param  \Exception  $e      * @return void      */     public function report(Exception $e)     {         parent::report($e);     }       /**      * Render an exception into an HTTP response.（在HTTP响应中呈现异常。）      *      * @param  \Illuminate\Http\Request  $request      * @param  \Exception  $e      * @return \Illuminate\Http\Response      */     public function render($request, Exception $e)     {         return parent::render($request, $e);     } }

这个类继承了一个实现Illuminate\Contracts\Debug\ExceptionHandler::class接口的异常处理基类Laravel\Lumen\Exceptions\Handler，这样，我们就可以很方便的做异常拦截和处理了！比如，

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public function render($request, Exception $e)     {         //数据验证异常拦截         if ($e instanceof \Illuminate\Validation\ValidationException) {             var_dump($e->validator->errors()->toArray());         }               return parent::render($request, $e);     }

这样我们就监听拦截到了Validation的ValidationException的异常，其实这部分往深扒的话，还有很多东西，如symfony下的debug和http-kernel两个模块的包，可以研究下

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版权声明：本文为博主原创文章，未经博主允许不得转载。