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，

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

<?phpnamespace 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

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

app/Exceptions/Handler.php

<?phpnamespace 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，

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。

转载于:https://www.cnblogs.com/cxscode/p/7573381.html

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