ExceptionMiddleware.php

<?php
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 * Copyright 2024 Google LLC
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

namespace Google\Cloud\Core\Middleware;

use Google\ApiCore\ApiException;
use Google\ApiCore\BidiStream;
use Google\ApiCore\Call;
use Google\ApiCore\ClientStream;
use Google\ApiCore\Middleware\MiddlewareInterface;
use Google\ApiCore\ServerStream;
use Google\Cloud\Core\RequestProcessorTrait;
use GuzzleHttp\Promise\PromiseInterface;
use Throwable;

/**
 * Middleware that adds autopopulation functionality. This middlware is
 * added iff auto population settings are present in the resource
 * descriptor config for the rpc method in context.
 *
 * @internal
 */
class ExceptionMiddleware implements MiddlewareInterface
{
    use RequestProcessorTrait;

    /** @var callable */
    private $nextHandler;

    public function __construct(callable $nextHandler) {
        $this->nextHandler = $nextHandler;
    }

    /**
     * @param Call $call
     * @param array $options
     *
     * @return PromiseInterface|ClientStream|ServerStream|BidiStream
     */
    public function __invoke(Call $call, array $options)
    {
        $response = ($this->nextHandler)($call, $options);
        if ($response instanceof PromiseInterface) {
            return $response->then(null, function ($value) {
                if ($value instanceof \Google\ApiCore\ApiException) {
                    throw $this->convertToGoogleException($value);
                }
                if ($value instanceof Throwable) {
                    throw $value;
                }
            });
        }
        // this can also be a Stream
        return $response;
    }
}