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<?php
/**
* Copyright 2016 Google Inc. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
namespace Google\Cloud\Core;
use Google\ApiCore\CredentialsWrapper;
use Google\Cloud\Core\ArrayTrait;
use Google\Cloud\Core\Duration;
use Google\Cloud\Core\Exception\NotFoundException;
use Google\Cloud\Core\Exception\ServiceException;
use Google\Cloud\Core\GrpcRequestWrapper;
use Google\Protobuf\NullValue;
/**
* Provides shared functionality for gRPC service implementations.
*/
trait GrpcTrait
{
use ArrayTrait;
use TimeTrait;
use WhitelistTrait;
/**
* @var GrpcRequestWrapper Wrapper used to handle sending requests to the
* gRPC API.
*/
private $requestWrapper;
/**
* Sets the request wrapper.
*
* @param GrpcRequestWrapper $requestWrapper
*/
public function setRequestWrapper(GrpcRequestWrapper $requestWrapper)
{
$this->requestWrapper = $requestWrapper;
}
/**
* Get the GrpcRequestWrapper.
*
* @return GrpcRequestWrapper|null
*/
public function requestWrapper()
{
return $this->requestWrapper;
}
/**
* Delivers a request.
*
* @param callable $request
* @param array $args
* @param bool $whitelisted
* @return \Generator|array
* @throws ServiceException
*/
public function send(callable $request, array $args, $whitelisted = false)
{
$requestOptions = $this->pluckArray([
'grpcOptions',
'retries',
'requestTimeout',
'grpcRetryFunction'
], $args[count($args) - 1]);
try {
return $this->requestWrapper->send($request, $args, $requestOptions);
} catch (NotFoundException $e) {
if ($whitelisted) {
throw $this->modifyWhitelistedError($e);
}
throw $e;
}
}
/**
* Gets the default configuration for generated clients.
*
* @param string $version
* @param callable|null $authHttpHandler
* @return array
*/
private function getGaxConfig($version, callable $authHttpHandler = null)
{
$config = [
'libName' => 'gccl',
'libVersion' => $version,
'transport' => 'grpc'
];
// GAX v0.32.0 introduced the CredentialsWrapper class and a different
// way to configure credentials. If the class exists, use this new method
// otherwise default to legacy usage.
if (class_exists(CredentialsWrapper::class)) {
$config['credentials'] = new CredentialsWrapper(
$this->requestWrapper->getCredentialsFetcher(),
$authHttpHandler
);
} else {
$config += [
'credentialsLoader' => $this->requestWrapper->getCredentialsFetcher(),
'authHttpHandler' => $authHttpHandler,
'enableCaching' => false
];
}
return $config;
}
/**
* Format a struct for the API.
*
* @param array $fields
* @return array
*/
private function formatStructForApi(array $fields)
{
$fFields = [];
foreach ($fields as $key => $value) {
$fFields[$key] = $this->formatValueForApi($value);
}
return ['fields' => $fFields];
}
private function unpackStructFromApi(array $struct)
{
$vals = [];
foreach ($struct['fields'] as $key => $val) {
$vals[$key] = $this->unpackValue($val);
}
return $vals;
}
private function unpackValue($value)
{
if (count($value) > 1) {
throw new \RuntimeException("Unexpected fields in struct: $value");
}
foreach ($value as $setField => $setValue) {
switch ($setField) {
case 'listValue':
$valueList = [];
foreach ($setValue['values'] as $innerValue) {
$valueList[] = $this->unpackValue($innerValue);
}
return $valueList;
case 'structValue':
return $this->unpackStructFromApi($value['structValue']);
default:
return $setValue;
}
}
}
private function flattenStruct(array $struct)
{
return $struct['fields'];
}
private function flattenValue(array $value)
{
if (count($value) > 1) {
throw new \RuntimeException("Unexpected fields in struct: $value");
}
if (isset($value['nullValue'])) {
return null;
}
return array_pop($value);
}
private function flattenListValue(array $value)
{
return $value['values'];
}
/**
* Format a list for the API.
*
* @param array $list
* @return array
*/
private function formatListForApi(array $list)
{
$values = [];
foreach ($list as $value) {
$values[] = $this->formatValueForApi($value);
}
return ['values' => $values];
}
/**
* Format a value for the API.
*
* @param array $value
* @return array
*/
private function formatValueForApi($value)
{
$type = gettype($value);
switch ($type) {
case 'string':
return ['string_value' => $value];
case 'double':
case 'integer':
return ['number_value' => $value];
case 'boolean':
return ['bool_value' => $value];
case 'NULL':
return ['null_value' => NullValue::NULL_VALUE];
case 'array':
if (!empty($value) && $this->isAssoc($value)) {
return ['struct_value' => $this->formatStructForApi($value)];
}
return ['list_value' => $this->formatListForApi($value)];
}
return [];
}
/**
* Format a gRPC timestamp to match the format returned by the REST API.
*
* @param array $timestamp
* @return string
*/
private function formatTimestampFromApi(array $timestamp)
{
$timestamp += [
'seconds' => 0,
'nanos' => 0
];
$dt = $this->createDateTimeFromSeconds($timestamp['seconds']);
return $this->formatTimeAsString($dt, $timestamp['nanos']);
}
/**
* Format a timestamp for the API with nanosecond precision.
*
* @param string $value
* @return array
*/
private function formatTimestampForApi($value)
{
list ($dt, $nanos) = $this->parseTimeString($value);
return [
'seconds' => (int) $dt->format('U'),
'nanos' => (int) $nanos
];
}
/**
* Format a duration for the API.
*
* @param string|Duration $value
* @return array
*/
private function formatDurationForApi($value)
{
if (is_string($value)) {
$d = explode('.', trim($value, 's'));
if (count($d) < 2) {
$seconds = $d[0];
$nanos = 0;
} else {
$seconds = (int) $d[0];
$nanos = $this->convertFractionToNanoSeconds($d[1]);
}
} elseif ($value instanceof Duration) {
$d = $value->get();
$seconds = $d['seconds'];
$nanos = $d['nanos'];
}
return [
'seconds' => $seconds,
'nanos' => $nanos
];
}
/**
* Construct a gapic client. Allows for tests to intercept.
*
* @param string $gapicName
* @param array $config
* @return mixed
*/
protected function constructGapic($gapicName, array $config)
{
return new $gapicName($config);
}
}
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