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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 Exception;
use Google\ApiCore\ApiException;
use Google\ApiCore\BidiStream;
use Google\ApiCore\Call;
use Google\ApiCore\ClientStream;
use Google\ApiCore\GrpcSupportTrait;
use Google\ApiCore\ServerStream;
use Google\ApiCore\ServiceAddressTrait;
use Google\ApiCore\Transport\Grpc\UnaryInterceptorInterface;
use Google\ApiCore\ValidationException;
use Google\ApiCore\ValidationTrait;
use Google\Rpc\Code;
use Grpc\BaseStub;
use Grpc\Channel;
use Grpc\ChannelCredentials;
use Grpc\Interceptor;
use GuzzleHttp\Promise\Promise;

/**
 * A gRPC based transport implementation.
 */
class GrpcTransport extends BaseStub implements TransportInterface
{
    use ValidationTrait;
    use GrpcSupportTrait;
    use ServiceAddressTrait;

    /**
     * @param string $hostname
     * @param array $opts
     *  - 'update_metadata': (optional) a callback function which takes in a
     * metadata array, and returns an updated metadata array
     *  - 'grpc.primary_user_agent': (optional) a user-agent string
     * @param Channel $channel An already created Channel object (optional)
     * @param Interceptor[]|UnaryInterceptorInterface[] $interceptors *EXPERIMENTAL*
     *        Interceptors used to intercept RPC invocations before a call starts.
     *        Please note that implementations of
     *        {@see Google\ApiCore\Transport\Grpc\UnaryInterceptorInterface} are
     *        considered deprecated and support will be removed in a future
     *        release. To prepare for this, please take the time to convert
     *        `UnaryInterceptorInterface` implementations over to a class which
     *        extends {@see Grpc\Interceptor}.
     * @throws Exception
     */
    public function __construct($hostname, $opts, Channel $channel = null, array $interceptors = [])
    {
        if ($interceptors) {
            $channel = Interceptor::intercept(
                $channel ?: new Channel($hostname, $opts),
                $interceptors
            );
        }

        parent::__construct($hostname, $opts, $channel);
    }

    /**
     * Builds a GrpcTransport.
     *
     * @param string $apiEndpoint
     *        The address of the API remote host, for example "example.googleapis.com. May also
     *        include the port, for example "example.googleapis.com:443"
     * @param array $config {
     *    Config options used to construct the gRPC transport.
     *
     *    @type array $stubOpts Options used to construct the gRPC stub.
     *    @type Channel $channel Grpc channel to be used.
     *    @type Interceptor[]|UnaryInterceptorInterface[] $interceptors *EXPERIMENTAL*
     *          Interceptors used to intercept RPC invocations before a call starts.
     *          Please note that implementations of
     *          {@see Google\ApiCore\Transport\Grpc\UnaryInterceptorInterface} are
     *          considered deprecated and support will be removed in a future
     *          release. To prepare for this, please take the time to convert
     *          `UnaryInterceptorInterface` implementations over to a class which
     *          extends {@see Grpc\Interceptor}.
     *    @type callable $clientCertSource A callable which returns the client cert as a string.
     * }
     * @return GrpcTransport
     * @throws ValidationException
     */
    public static function build($apiEndpoint, array $config = [])
    {
        self::validateGrpcSupport();
        $config += [
            'stubOpts'         => [],
            'channel'          => null,
            'interceptors'     => [],
            'clientCertSource' => null,
        ];
        list($addr, $port) = self::normalizeServiceAddress($apiEndpoint);
        $host = "$addr:$port";
        $stubOpts = $config['stubOpts'];
        // Set the required 'credentials' key in stubOpts if it is not already set. Use
        // array_key_exists because null is a valid value.
        if (!array_key_exists('credentials', $stubOpts)) {
            if (isset($config['clientCertSource'])) {
                list($cert, $key) = self::loadClientCertSource($config['clientCertSource']);
                $stubOpts['credentials'] = ChannelCredentials::createSsl(null, $key, $cert);
            } else {
                $stubOpts['credentials'] = ChannelCredentials::createSsl();
            }
        }
        $channel = $config['channel'];
        if (!is_null($channel) && !($channel instanceof Channel)) {
            throw new ValidationException(
                "Channel argument to GrpcTransport must be of type \Grpc\Channel, " .
                "instead got: " . print_r($channel, true)
            );
        }
        try {
            return new GrpcTransport($host, $stubOpts, $channel, $config['interceptors']);
        } catch (Exception $ex) {
            throw new ValidationException(
                "Failed to build GrpcTransport: " . $ex->getMessage(),
                $ex->getCode(),
                $ex
            );
        }
    }

    /**
     * {@inheritdoc}
     */
    public function startBidiStreamingCall(Call $call, array $options)
    {
        return new BidiStream(
            $this->_bidiRequest(
                '/' . $call->getMethod(),
                [$call->getDecodeType(), 'decode'],
                isset($options['headers']) ? $options['headers'] : [],
                $this->getCallOptions($options)
            ),
            $call->getDescriptor()
        );
    }

    /**
     * {@inheritdoc}
     */
    public function startClientStreamingCall(Call $call, array $options)
    {
        return new ClientStream(
            $this->_clientStreamRequest(
                '/' . $call->getMethod(),
                [$call->getDecodeType(), 'decode'],
                isset($options['headers']) ? $options['headers'] : [],
                $this->getCallOptions($options)
            ),
            $call->getDescriptor()
        );
    }

    /**
     * {@inheritdoc}
     */
    public function startServerStreamingCall(Call $call, array $options)
    {
        $message = $call->getMessage();

        if (!$message) {
            throw new \InvalidArgumentException('A message is required for ServerStreaming calls.');
        }

        return new ServerStream(
            $this->_serverStreamRequest(
                '/' . $call->getMethod(),
                $message,
                [$call->getDecodeType(), 'decode'],
                isset($options['headers']) ? $options['headers'] : [],
                $this->getCallOptions($options)
            ),
            $call->getDescriptor()
        );
    }

    /**
     * {@inheritdoc}
     */
    public function startUnaryCall(Call $call, array $options)
    {
        $unaryCall = $this->_simpleRequest(
            '/' . $call->getMethod(),
            $call->getMessage(),
            [$call->getDecodeType(), 'decode'],
            isset($options['headers']) ? $options['headers'] : [],
            $this->getCallOptions($options)
        );

        /** @var Promise $promise */
        $promise = new Promise(
            function () use ($unaryCall, $options, &$promise) {
                list($response, $status) = $unaryCall->wait();

                if ($status->code == Code::OK) {
                    if (isset($options['metadataCallback'])) {
                        $metadataCallback = $options['metadataCallback'];
                        $metadataCallback($unaryCall->getMetadata());
                    }
                    $promise->resolve($response);
                } else {
                    throw ApiException::createFromStdClass($status);
                }
            },
            [$unaryCall, 'cancel']
        );

        return $promise;
    }

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

        if (isset($options['credentialsWrapper'])) {
            $audience = isset($options['audience'])
                ? $options['audience']
                : null;
            $credentialsWrapper = $options['credentialsWrapper'];
            $callOptions['call_credentials_callback'] = $credentialsWrapper
                ->getAuthorizationHeaderCallback($audience);
        }

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

        return $callOptions;
    }

    private static function loadClientCertSource(callable $clientCertSource)
    {
        return call_user_func($clientCertSource);
    }
}

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