How to use Hyperf framework for exception catching

How to use Hyper framework for exception capture

Introduction:
Exceptions are problems often encountered in the programming process. Reasonable exception handling can improve the reliability of the system. sex and stability. The Hyperf framework is a high-performance framework based on Swoole extensions and provides a rich exception handling mechanism. This article will introduce how to use the Hyperf framework for exception catching and provide specific code examples.

1. Global Exception Capture
The Hyperf framework provides the function of global exception capture, which can interrupt the execution of the request when an exception occurs, capture and handle the exception. Through global exception capture, we can handle various exceptions in a unified manner and return corresponding error information to the client.

First, we need to configure it in the project's configuration file config/autoload/exceptions.php. The code is as follows:

<?php
return [
    'handler' => [
        'http' => [
            AppExceptionHandlerAppExceptionHandler::class,
        ],
    ],
];

In the above code, a # is configured ##httpType exception handling classAppExceptionHandlerAppExceptionHandler, we need to customize this class and implement the logic of exception handling. A simplified sample code is as follows:

<?php
namespace AppExceptionHandler;

use HyperfHttpServerExceptionHandlerHttpExceptionHandler;
use PsrHttpMessageResponseInterface;
use Throwable;

class AppExceptionHandler extends HttpExceptionHandler
{
    public function handle(Throwable $throwable, ResponseInterface $response)
    {   
        // 异常处理逻辑
        // 返回错误信息给客户端
        
        return $response;
    }
}

HttpExceptionHandler class and implement the handle() method, in which we can handle Exception caught.

In addition to global exception capture, you can also capture and handle specific exceptions based on customized business requirements. In the Hyperf framework, we can implement custom exception handling by inheriting the
AbstractExceptionHandler class and overriding the handle() method. Below is a simple example to illustrate.

AppExceptionHandler and implement custom exception handling logic in this class. The code is as follows:

<?php
namespace AppExceptionHandler;

use HyperfExceptionHandlerExceptionHandler;
use HyperfHttpMessageStreamSwooleStream;
use PsrHttpMessageResponseInterface;
use Throwable;

class AppExceptionHandler extends ExceptionHandler
{
    public function handle(Throwable $throwable, ResponseInterface $response)
    {
        // 异常处理逻辑
        // 返回错误信息给客户端
        
        return $response->withStatus(500)
            ->withAddedHeader('Content-Type', 'application/json')
            ->withBody(new SwooleStream(json_encode([
                'code' => $throwable->getCode(),
                'message' => $throwable->getMessage(),
            ])));
    }

    public function isValid(Throwable $throwable): bool
    {
        return true; // 捕获所有异常
    }
}

ExceptionHandler class and implement the handle() method and the isValid() method . In the handle() method, you can handle the caught exception and return the error information to the client. In the isValid() method, you can decide whether to catch the exception.

In the Hyperf framework, the order of exception handling is from
Exception to Throwable, that is, exceptions are processed from top to bottom. of. In the case of global exception catching and custom exception handling, if an exception meets the processing conditions of multiple exception handlers at the same time, the framework will determine which handler to use based on the priority of the handler.

config/autoload/exceptions.php, the configuration order of exception handlers is the priority order of the handlers. The processor behind the configuration will handle exceptions first. If a processor successfully handles the exception, subsequent processors will not handle it again.

Reasonable exception handling is an important part of developing high-quality systems. The Hyperf framework provides a mechanism for global exception capture and custom exception handling, which can help us achieve flexible and efficient exception handling. . This article explains how to configure global exception capture and write custom exception handling logic, and provides detailed code examples, hoping to help readers.

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