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<?php
/*
* Copyright 2021 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\Rest;
use Google\ApiCore\ApiException;
use Google\ApiCore\ApiStatus;
use Google\ApiCore\ServerStreamingCallInterface;
use Google\Rpc\Code;
use GuzzleHttp\Exception\RequestException;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;
use stdClass;
/**
* Class RestServerStreamingCall implements \Google\ApiCore\ServerStreamingCallInterface.
*
* @experimental
*/
class RestServerStreamingCall implements ServerStreamingCallInterface
{
/**
* @var callable
*/
private $httpHandler;
/**
* @var RequestInterface
*/
private $originalRequest;
/**
* @var ?JsonStreamDecoder
*/
private $decoder;
/**
* @var string
*/
private $decodeType;
/**
* @var array<mixed>
*/
private $decoderOptions;
/**
* @var ?ResponseInterface
*/
private $response;
/**
* @var stdClass
*/
private $status;
/**
* @param callable $httpHandler
* @param string $decodeType
* @param array<mixed> $decoderOptions
*/
public function __construct(callable $httpHandler, string $decodeType, array $decoderOptions)
{
$this->httpHandler = $httpHandler;
$this->decodeType = $decodeType;
$this->decoderOptions = $decoderOptions;
}
/**
* {@inheritdoc}
*/
public function start($request, array $headers = [], array $callOptions = [])
{
$this->originalRequest = $this->appendHeaders($request, $headers);
try {
$handler = $this->httpHandler;
$response = $handler(
$this->originalRequest,
$callOptions
)->wait();
} catch (\Exception $ex) {
if ($ex instanceof RequestException && $ex->hasResponse()) {
$ex = ApiException::createFromRequestException($ex, /* isStream */ true);
}
throw $ex;
}
// Create an OK Status for a successful request just so that it
// has a return value.
$this->status = new stdClass();
$this->status->code = Code::OK;
$this->status->message = ApiStatus::OK;
$this->status->details = [];
$this->response = $response;
}
/**
* @param RequestInterface $request
* @param array<mixed> $headers
* @return RequestInterface
*/
private function appendHeaders(RequestInterface $request, array $headers)
{
foreach ($headers as $key => $value) {
$request = $request->hasHeader($key) ?
$request->withAddedHeader($key, $value) :
$request->withHeader($key, $value);
}
return $request;
}
/**
* {@inheritdoc}
*/
public function responses()
{
if (is_null($this->response)) {
throw new \Exception('Stream has not been started.');
}
// Decode the stream and yield responses as they are read.
$this->decoder = new JsonStreamDecoder(
$this->response->getBody(),
$this->decodeType,
$this->decoderOptions
);
foreach ($this->decoder->decode() as $message) {
yield $message;
}
}
/**
* Return the status of the server stream. If the call has not been started
* this will be null.
*
* @return stdClass The status, with integer $code, string
* $details, and array $metadata members
*/
public function getStatus()
{
return $this->status;
}
/**
* {@inheritdoc}
*/
public function getMetadata()
{
return is_null($this->response) ? null : $this->response->getHeaders();
}
/**
* The Rest transport does not support trailing metadata. This is a
* passthrough to getMetadata().
*/
public function getTrailingMetadata()
{
return $this->getMetadata();
}
/**
* {@inheritdoc}
*/
public function getPeer()
{
return $this->originalRequest->getUri();
}
/**
* {@inheritdoc}
*/
public function cancel()
{
if (!is_null($this->decoder)) {
$this->decoder->close();
}
}
/**
* For the REST transport this is a no-op.
* {@inheritdoc}
*/
public function setCallCredentials($call_credentials)
{
// Do nothing.
}
}