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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 BadMethodCallException;
use Google\ApiCore\ApiException;
use Google\ApiCore\Call;
use Google\ApiCore\RequestBuilder;
use Google\ApiCore\ServerStream;
use Google\ApiCore\ServiceAddressTrait;
use Google\ApiCore\Transport\Rest\RestServerStreamingCall;
use Google\ApiCore\ValidationException;
use Google\ApiCore\ValidationTrait;
use Google\Protobuf\Internal\Message;
use GuzzleHttp\Exception\RequestException;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
/**
* A REST based transport implementation.
*/
class RestTransport implements TransportInterface
{
use ValidationTrait;
use ServiceAddressTrait;
use HttpUnaryTransportTrait {
startServerStreamingCall as protected unsupportedServerStreamingCall;
}
private RequestBuilder $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<mixed> $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(string $apiEndpoint, string $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;
$body = (string) $response->getBody();
// In some rare cases LRO response metadata may not be loaded
// in the descriptor pool, triggering an exception. The catch
// statement handles this case and attempts to add the LRO
// metadata type to the pool by directly instantiating the
// metadata class.
try {
$return->mergeFromJsonString(
$body,
true
);
} catch (\Exception $ex) {
if (!isset($options['metadataReturnType'])) {
throw $ex;
}
if (strpos($ex->getMessage(), 'Error occurred during parsing:') !== 0) {
throw $ex;
}
new $options['metadataReturnType']();
$return->mergeFromJsonString(
$body,
true
);
}
if (isset($options['metadataCallback'])) {
$metadataCallback = $options['metadataCallback'];
$metadataCallback($response->getHeaders());
}
return $return;
},
function (\Throwable $ex) {
if ($ex instanceof RequestException && $ex->hasResponse()) {
throw ApiException::createFromRequestException($ex);
}
throw $ex;
}
);
}
/**
* {@inheritdoc}
* @throws \BadMethodCallException for forwards compatibility with older GAPIC clients
*/
public function startServerStreamingCall(Call $call, array $options)
{
$message = $call->getMessage();
if (!$message) {
throw new \InvalidArgumentException('A message is required for ServerStreaming calls.');
}
// Maintain forwards compatibility with older GAPIC clients not configured for REST server streaming
// @see https://github.com/googleapis/gax-php/issues/370
if (!$this->requestBuilder->pathExists($call->getMethod())) {
$this->unsupportedServerStreamingCall($call, $options);
}
$headers = self::buildCommonHeaders($options);
$callOptions = $this->getCallOptions($options);
$request = $this->requestBuilder->build(
$call->getMethod(),
$call->getMessage()
// Exclude headers here because they will be added in _serverStreamRequest().
);
$decoderOptions = [];
if (isset($options['decoderOptions'])) {
$decoderOptions = $options['decoderOptions'];
}
return new ServerStream(
$this->_serverStreamRequest(
$this->httpHandler,
$request,
$headers,
$call->getDecodeType(),
$callOptions,
$decoderOptions
),
$call->getDescriptor()
);
}
/**
* Creates and starts a RestServerStreamingCall.
*
* @param callable $httpHandler The HTTP Handler to invoke the request with.
* @param RequestInterface $request The request to invoke.
* @param array<mixed> $headers The headers to include in the request.
* @param string $decodeType The response stream message type to decode.
* @param array<mixed> $callOptions The call options to use when making the call.
* @param array<mixed> $decoderOptions The options to use for the JsonStreamDecoder.
*
* @return RestServerStreamingCall
*/
private function _serverStreamRequest(
$httpHandler,
$request,
$headers,
$decodeType,
$callOptions,
$decoderOptions = []
) {
$call = new RestServerStreamingCall(
$httpHandler,
$decodeType,
$decoderOptions
);
$call->start($request, $headers, $callOptions);
return $call;
}
/**
* @param array<mixed> $options
*
* @return array<mixed>
*/
private function getCallOptions(array $options)
{
$callOptions = $options['transportOptions']['restOptions'] ?? [];
if (isset($options['timeoutMillis'])) {
$callOptions['timeout'] = $options['timeoutMillis'] / 1000;
}
if ($this->clientCertSource) {
list($cert, $key) = self::loadClientCertSource($this->clientCertSource);
$callOptions['cert'] = $cert;
$callOptions['key'] = $key;
}
return $callOptions;
}
}
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