【发布时间】：2016-11-02 01:39:15
【问题描述】：
我正在 PHP 7.0 (Ubuntu 16.04) 上使用 Slim 框架构建 REST API。为了正确处理异常，我扩展了\Exception 基类，如下所示：
namespace App\Exceptions;
class AppException extends \Exception
{
}
然后我将它用作所有应用程序异常的基本异常。对于所有需要向用户提供 JSON 响应的异常，我编写了另一个类：
namespace App\Exceptions;
use Slim\Container;
use Slim\Http\Request;
use Slim\Http\Response;
class JsonApiException extends AppException
{
private $params = [
"message" => "",
"code" => 0,
"previous" => null,
"api" => [
"message" => "",
"code" => "",
"status" => 200
]
];
public function __construct(array $params)
{
$this->params = array_merge_recursive($this->params, $params);
parent::__construct($this->params["message"], 0, $this->params["previous"]);
}
public function getApiMessage() {
return $this->params["api"]["message"];
}
public function getApiCode() {
return $this->params["api"]["code"];
}
public function getHttpStatusCode() {
return $this->params["api"]["status"];
}
public function shouldBeLogged() {
return false;
}
public function log(Container $container, Request $request) {
if(!$this->shouldBeLogged()) return;
$logger = $container->get('logger.info');
$logger->info($this, array_merge($request->getHeaders(), [
"method" => $_SERVER["REQUEST_METHOD"],
"time" => $_SERVER["REQUEST_TIME"],
"query_string" => $_SERVER["QUERY_STRING"],
"host" => $_SERVER["HTTP_HOST"],
"referer" => $_SERVER["HTTP_REFERER"],
"user_agent" => $_SERVER["HTTP_USER_AGENT"],
"ip" => $_SERVER["REMOTE_ADDR"],
"uri" => $_SERVER["REQUEST_URI"]
]));
}
public function httpRespond(Response $response) {
return $response->withJson([
"error" => true,
"errors" => [
"server" => [[
"code" => $this->getApiCode(),
"message" => $this->getApiMessage()
]]
]
], $this->getHttpStatusCode());
}
}
然后我将其用作所有 JSON 错误的基本异常。我正在使用以下错误让客户知道它提供的用于注册的电子邮件地址已经存在。
namespace App\Exceptions\Validation\User;
use App\Exceptions\JsonApiException;
class EmailAlreadyUsedException extends JsonApiException
{
public function __construct()
{
parent::__construct([
"message" => "The e-mail provided by the exception has already been used",
"api" => [
"message" => "The provided e-mail address has already been used",
"code" => "EmailAlreadyUsed"
],
"previous" => null
]);
}
}
每当发生错误时，我都会将其添加到另一个自定义异常中，以便在验证期间同时响应多个错误：
namespace App\Exceptions;
use Slim\Http\Response;
class JsonApiMultipleException extends JsonApiException
{
private $httpStatusCode = 200;
private $exceptions = [];
public function __construct($httpStatusCode = 200, \Exception $previous = null)
{
parent::__construct([]);
$this->httpStatusCode = 200;
}
public function setHttpStatusCode(int $code) {
$this->httpStatusCode = $code;
}
public function add(string $param, JsonApiException $exception) {
if(!array_key_exists($param, $this->exceptions)) {
$this->exceptions[$param] = [];
}
$this->exceptions[$param][] = $exception;
}
public function length() {
$len = 0;
foreach ($this->exceptions as $param => $exceptions) {
$len += count($exceptions);
}
return $len;
}
public function map() {
$mapped = [];
foreach ($this->exceptions as $param => $exceptions) {
$mapped[$param] = array_map(function (JsonApiException $exception) {
return [
"code" => $exception->getApiCode(),
"message" => $exception->getApiMessage()
];
}, $exceptions);
}
return $mapped;
}
public function getExceptions() {
return $this->exceptions;
}
public function httpRespond(Response $response)
{
return $response->withJson([
"error" => true,
"errors" => $this->map()
], $this->httpStatusCode);
}
}
但是当我在验证期间抛出这个异常时（）：
namespace App\Validators;
use App\Exceptions\Validation\User\EmailAlreadyUsedException;
use App\Exceptions\Validation\User\InvalidEmailException;
use App\Exceptions\Validation\User\InvalidFirstNameException;
use App\Exceptions\Validation\User\InvalidLastNameException;
use App\Exceptions\Validation\User\InvalidPasswordException;
use Respect\Validation\Validator as v;
class UserValidator extends Validator
{
//...
private function validateEmail() {
//Validate e-mail
if(!v::stringType()->email()->validate($this->user->getEmail())) {
$this->exception->add('email', new InvalidEmailException());
}
//Check if e-mail already used
if(\UserQuery::create()->filterByEmail($this->user->getEmail())->count() > 0) {
$this->exception->add('email', new EmailAlreadyUsedException());
}
}
//...
}
它会抛出以下异常：
[Thu Jun 30 05:42:47 2016] Slim Application Error:
Type: Error
Message: Wrong parameters for App\Exceptions\Validation\User\EmailAlreadyUsedException([string $message [, long $code [, Throwable $previous = NULL]]])
File: /var/www/ElectroAbhi/app/Exceptions/JsonApiException.php
Line: 33
Trace: #0 /var/www/ElectroAbhi/app/Exceptions/JsonApiException.php(33): Exception->__construct(Array, 0, Array)
#1 /var/www/ElectroAbhi/app/Exceptions/Validation/User/EmailAlreadyUsedException.php(19): App\Exceptions\JsonApiException->__construct(Array)
#2 /var/www/ElectroAbhi/app/Validators/UserValidator.php(58): App\Exceptions\Validation\User\EmailAlreadyUsedException->__construct()
#3 /var/www/ElectroAbhi/app/Validators/UserValidator.php(32): App\Validators\UserValidator->validateEmail()
#4 /var/www/ElectroAbhi/app/Routes/API/User/Create.php(39): App\Validators\UserValidator->validate()
#5 [internal function]: App\Routes\API\User\Create->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#6 /var/www/ElectroAbhi/vendor/slim/slim/Slim/Handlers/Strategies/RequestResponse.php(41): call_user_func(Object(App\Routes\API\User\Create), Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#7 /var/www/ElectroAbhi/vendor/slim/slim/Slim/Route.php(325): Slim\Handlers\Strategies\RequestResponse->__invoke(Object(App\Routes\API\User\Create), Object(Slim\Http\Request), Object(Slim\Http\Response), Array)
#8 /var/www/ElectroAbhi/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(116): Slim\Route->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response))
#9 /var/www/ElectroAbhi/vendor/slim/slim/Slim/Route.php(297): Slim\Route->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))
#10 /var/www/ElectroAbhi/vendor/slim/slim/Slim/App.php(443): Slim\Route->run(Object(Slim\Http\Request), Object(Slim\Http\Response))
#11 /var/www/ElectroAbhi/vendor/slim/slim/Slim/MiddlewareAwareTrait.php(116): Slim\App->__invoke(Object(Slim\Http\Request), Object(Slim\Http\Response))
#12 /var/www/ElectroAbhi/vendor/slim/slim/Slim/App.php(337): Slim\App->callMiddlewareStack(Object(Slim\Http\Request), Object(Slim\Http\Response))
#13 /var/www/ElectroAbhi/vendor/slim/slim/Slim/App.php(298): Slim\App->process(Object(Slim\Http\Request), Object(Slim\Http\Response))
#14 /var/www/ElectroAbhi/public/index.php(105): Slim\App->run()
#15 {main}
我真的很困惑，当我在EmailAlreadyUsedException中明确实现了不带参数的构造函数时，它如何显示定义为EmailAlreadyUsedException([string $message [, long $code [, Throwable $previous = NULL]]])？
更新
我试图调试并找出为什么 $this->params["message"] 是JsonApiException 的构造函数中的一个数组，但现在我更加困惑了：
class JsonApiException extends AppException
{
private $params = [
"message" => "",
"code" => 0,
"previous" => null,
"api" => [
"message" => "",
"code" => "",
"status" => 200
]
];
public function __construct(array $params)
{
print_r($params);
die;
$this->params = array_merge_recursive($this->params, $params);
parent::__construct($this->params["message"], 0, $this->params["previous"]);
}
}
结果 -> Array ()
虽然我路过
parent::__construct([
"message" => "The e-mail provided by the exception has already been used",
"api" => [
"message" => "The provided e-mail address has already been used",
"code" => "EmailAlreadyUsed"
],
"previous" => null
]);
从EmailAlreadyUsedException 到JsonApiException 的构造函数，$params 数组似乎是空的。我又错过了什么吗？
【问题讨论】：
标签： php exception-handling slim php-7