TransportCallMiddleware.php

<?php
declare(strict_types=1);

/*
 * Copyright 2025 Google LLC
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 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * 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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 */
namespace Google\ApiCore\Middleware;

use Google\ApiCore\Call;
use Google\ApiCore\Transport\TransportInterface;

/**
 * A Middleware in charge of handling the end of the callstack to call the transport layer.
 * This middleware is made so the callstack in the GapicClientTrait is always a middleware.
 *
 * @internal
 */
class TransportCallMiddleware implements MiddlewareInterface
{
    /*
     * @param TransportInterface $transport
     * @param array $transportCallMethods
     */
    public function __construct(
        private TransportInterface $transport,
        private array $transportCallMethods
    ) {
    }

    public function __invoke(Call $call, array $options)
    {
        $startCallMethod = $this->transportCallMethods[$call->getCallType()];
        return $this->transport->$startCallMethod($call, $options);
    }
}