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LogErrorHandler.php
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129 lines (111 loc) · 4.06 KB
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<?php
declare(strict_types=1);
namespace Dot\ErrorHandler;
use ErrorException;
use Laminas\Log\LoggerInterface;
use Laminas\Stratigility\Middleware\ErrorResponseGenerator;
use Psr\Http\Message\ResponseInterface;
use Psr\Http\Message\ServerRequestInterface;
use Psr\Http\Server\MiddlewareInterface;
use Psr\Http\Server\RequestHandlerInterface;
use Throwable;
use function error_reporting;
use function in_array;
use function restore_error_handler;
use function set_error_handler;
class LogErrorHandler implements MiddlewareInterface, ErrorHandlerInterface
{
/** @var callable[] */
private $listeners = [];
/** @var callable|null Routine that will generate the error response. */
private $responseGenerator;
/** @var callable */
private $responseFactory;
private LoggerInterface|null $logger;
/**
* @param callable $responseFactory A factory capable of returning an
* empty ResponseInterface instance to update and return when returning
* an error response.
* @param null|callable $responseGenerator Callback that will generate the final
* error response; if none is provided, ErrorResponseGenerator is used.
*/
public function __construct(
callable $responseFactory,
?callable $responseGenerator = null,
?LoggerInterface $logger = null
) {
$this->responseFactory = function () use ($responseFactory): ResponseInterface {
return $responseFactory();
};
$this->responseGenerator = $responseGenerator ?: new ErrorResponseGenerator();
$this->logger = $logger;
}
public function attachListener(callable $listener): void
{
if (in_array($listener, $this->listeners, true)) {
return;
}
$this->listeners[] = $listener;
}
public function process(ServerRequestInterface $request, RequestHandlerInterface $handler): ResponseInterface
{
set_error_handler($this->createErrorHandler());
try {
$response = $handler->handle($request);
} catch (Throwable $e) {
$response = $this->handleThrowable($e, $request);
}
restore_error_handler();
return $response;
}
/**
* Handles all throwables, generating and returning a response.
*
* Passes the error, request, and response prototype to createErrorResponse(),
* triggers all listeners with the same arguments (but using the response
* returned from createErrorResponse()), and then returns the response.
*
* If a valid Logger is available, the error and it's message are logged in the
* configured format.
*/
public function handleThrowable(Throwable $e, ServerRequestInterface $request): ResponseInterface
{
$generator = $this->responseGenerator;
if ($this->logger instanceof LoggerInterface) {
$this->logger->err($e->getMessage(), (array) $e);
}
$response = $generator($e, $request, ($this->responseFactory)());
$this->triggerListeners($e, $request, $response);
return $response;
}
/**
* Creates and returns a callable error handler that raises exceptions.
*
* Only raises exceptions for errors that are within the error_reporting mask.
*/
public function createErrorHandler(): callable
{
/**
* @throws ErrorException if error is not within the error_reporting mask.
*/
return function (int $errno, string $errstr, string $errfile, int $errline): void {
if (! (error_reporting() & $errno)) {
// error_reporting does not include this error
return;
}
throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
};
}
/**
* Trigger all error listeners.
*/
public function triggerListeners(
Throwable $error,
ServerRequestInterface $request,
ResponseInterface $response
): void {
foreach ($this->listeners as $listener) {
$listener($error, $request, $response);
}
}
}