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<?php
/*
 * Copyright 2018 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.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
namespace Google\ApiCore\Transport;

use Google\ApiCore\ApiException;
use Google\ApiCore\ApiStatus;
use Google\ApiCore\Call;
use Google\ApiCore\RequestBuilder;
use Google\ApiCore\ServiceAddressTrait;
use Google\ApiCore\ValidationException;
use Google\ApiCore\ValidationTrait;
use Google\Protobuf\Internal\Message;
use GuzzleHttp\Exception\RequestException;
use Psr\Http\Message\ResponseInterface;

/**
 * A REST based transport implementation.
 */
class RestTransport implements TransportInterface
{
    use ValidationTrait;
    use ServiceAddressTrait;
    use HttpUnaryTransportTrait;

    private $requestBuilder;

    /**
     * @param RequestBuilder $requestBuilder A builder responsible for creating
     *        a PSR-7 request from a set of request information.
     * @param callable $httpHandler A handler used to deliver PSR-7 requests.
     */
    public function __construct(
        RequestBuilder $requestBuilder,
        callable $httpHandler
    ) {
        $this->requestBuilder = $requestBuilder;
        $this->httpHandler = $httpHandler;
        $this->transportName = 'REST';
    }

    /**
     * Builds a RestTransport.
     *
     * @param string $apiEndpoint
     *        The address of the API remote host, for example "example.googleapis.com".
     * @param string $restConfigPath
     *        Path to rest config file.
     * @param array $config {
     *    Config options used to construct the gRPC transport.
     *
     *    @type callable $httpHandler A handler used to deliver PSR-7 requests.
     *    @type callable $clientCertSource A callable which returns the client cert as a string.
     * }
     * @return RestTransport
     * @throws ValidationException
     */
    public static function build($apiEndpoint, $restConfigPath, array $config = [])
    {
        $config += [
            'httpHandler'  => null,
            'clientCertSource' => null,
        ];
        list($baseUri, $port) = self::normalizeServiceAddress($apiEndpoint);
        $requestBuilder = new RequestBuilder("$baseUri:$port", $restConfigPath);
        $httpHandler = $config['httpHandler'] ?: self::buildHttpHandlerAsync();
        $transport = new RestTransport($requestBuilder, $httpHandler);
        if ($config['clientCertSource']) {
            $transport->configureMtlsChannel($config['clientCertSource']);
        }
        return $transport;
    }

    /**
     * {@inheritdoc}
     */
    public function startUnaryCall(Call $call, array $options)
    {
        $headers = self::buildCommonHeaders($options);

        // call the HTTP handler
        $httpHandler = $this->httpHandler;
        return $httpHandler(
            $this->requestBuilder->build(
                $call->getMethod(),
                $call->getMessage(),
                $headers
            ),
            $this->getCallOptions($options)
        )->then(
            function (ResponseInterface $response) use ($call, $options) {
                $decodeType = $call->getDecodeType();
                /** @var Message $return */
                $return = new $decodeType;
                $return->mergeFromJsonString(
                    (string) $response->getBody(),
                    true
                );

                if (isset($options['metadataCallback'])) {
                    $metadataCallback = $options['metadataCallback'];
                    $metadataCallback($response->getHeaders());
                }

                return $return;
            },
            function (\Exception $ex) {
                if ($ex instanceof RequestException && $ex->hasResponse()) {
                    throw $this->convertToApiException($ex);
                }

                throw $ex;
            }
        );
    }

    private function getCallOptions(array $options)
    {
        $callOptions = isset($options['transportOptions']['restOptions'])
            ? $options['transportOptions']['restOptions']
            : [];

        if (isset($options['timeoutMillis'])) {
            $callOptions['timeout'] = $options['timeoutMillis'] / 1000;
        }

        if ($this->clientCertSource) {
            list($cert, $key) = self::loadClientCertSource();
            $callOptions['cert'] = $cert;
            $callOptions['key'] = $key;
        }

        return $callOptions;
    }

    /**
     * @param RequestException $ex
     * @return ApiException
     * @throws ValidationException
     */
    private function convertToApiException(RequestException $ex)
    {
        $res = $ex->getResponse();
        $body = (string) $res->getBody();
        if ($error = json_decode($body, true)['error']) {
            $basicMessage = $error['message'];
            $code = isset($error['status'])
                ? ApiStatus::rpcCodeFromStatus($error['status'])
                : $ex->getCode();
            $metadata = isset($error['details']) ? $error['details'] : null;
            return ApiException::createFromApiResponse($basicMessage, $code, $metadata);
        }
        // Use the RPC code instead of the HTTP Status Code.
        $code = ApiStatus::rpcCodeFromHttpStatusCode($res->getStatusCode());
        return ApiException::createFromApiResponse($body, $code);
    }
}

Filemanager

Name Type Size Permission Actions
Grpc Folder 2755
GrpcFallbackTransport.php File 7.32 KB 0644
GrpcTransport.php File 9.96 KB 0644
HttpUnaryTransportTrait.php File 5.19 KB 0644
RestTransport.php File 6.61 KB 0644
TransportInterface.php File 2.81 KB 0644