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<?php
/*
* Copyright 2016 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;
use Google\LongRunning\Operation;
use Google\Protobuf\Any;
use Google\Protobuf\Internal\Message;
use Google\Rpc\Status;
use LogicException;
/**
* Response object from a long running API method.
*
* The OperationResponse object is returned by API methods that perform
* a long running operation. It provides methods that can be used to
* poll the status of the operation, retrieve the results, and cancel
* the operation.
*
* To support a long running operation, the server must implement the
* Operations API, which is used by the OperationResponse object. If
* more control is required, it is possible to make calls against the
* Operations API directly instead of via the OperationResponse object
* using an Operations Client instance.
*/
class OperationResponse
{
use PollingTrait;
const DEFAULT_POLLING_INTERVAL = 1000;
const DEFAULT_POLLING_MULTIPLIER = 2;
const DEFAULT_MAX_POLLING_INTERVAL = 60000;
const DEFAULT_MAX_POLLING_DURATION = 0;
private $operationName;
private $operationsClient;
private $operationReturnType;
private $metadataReturnType;
private $defaultPollSettings = [
'initialPollDelayMillis' => self::DEFAULT_POLLING_INTERVAL,
'pollDelayMultiplier' => self::DEFAULT_POLLING_MULTIPLIER,
'maxPollDelayMillis' => self::DEFAULT_MAX_POLLING_INTERVAL,
'totalPollTimeoutMillis' => self::DEFAULT_MAX_POLLING_DURATION,
];
private $lastProtoResponse;
private $deleted = false;
private $additionalArgs;
private $getOperationMethod;
private $cancelOperationMethod;
private $deleteOperationMethod;
private $operationStatusMethod;
private $operationStatusDoneValue;
private $operationErrorCodeMethod;
private $operationErrorMessageMethod;
/**
* OperationResponse constructor.
*
* @param string $operationName
* @param object $operationsClient
* @param array $options {
* Optional. Options for configuring the operation response object.
*
* @type string $operationReturnType The return type of the longrunning operation.
* @type string $metadataReturnType The type of the metadata returned in the operation response.
* @type int $initialPollDelayMillis The initial polling interval to use, in milliseconds.
* @type int $pollDelayMultiplier Multiplier applied to the polling interval on each retry.
* @type int $maxPollDelayMillis The maximum polling interval to use, in milliseconds.
* @type int $totalPollTimeoutMillis The maximum amount of time to continue polling.
* @type object $lastProtoResponse A response already received from the server.
* @type string $getOperationMethod The method on $operationsClient to get the operation.
* @type string $cancelOperationMethod The method on $operationsClient to cancel the operation.
* @type string $deleteOperationMethod The method on $operationsClient to delete the operation.
* @type string $operationStatusMethod The method on the operation to get the status.
* @type string $operationStatusDoneValue The method on the operation to determine if the status is done.
* @type array $additionalOperationArguments Additional arguments to pass to $operationsClient methods.
* @type string $operationErrorCodeMethod The method on the operation to get the error code
* @type string $operationErrorMessageMethod The method on the operation to get the error status
* }
*/
public function __construct($operationName, $operationsClient, $options = [])
{
$this->operationName = $operationName;
$this->operationsClient = $operationsClient;
$options += [
'operationReturnType' => null,
'metadataReturnType' => null,
'lastProtoResponse' => null,
'getOperationMethod' => 'getOperation',
'cancelOperationMethod' => 'cancelOperation',
'deleteOperationMethod' => 'deleteOperation',
'operationStatusMethod' => 'getDone',
'operationStatusDoneValue' => true,
'additionalOperationArguments' => [],
'operationErrorCodeMethod' => null,
'operationErrorMessageMethod' => null,
];
$this->operationReturnType = $options['operationReturnType'];
$this->metadataReturnType = $options['metadataReturnType'];
$this->lastProtoResponse = $options['lastProtoResponse'];
$this->getOperationMethod = $options['getOperationMethod'];
$this->cancelOperationMethod = $options['cancelOperationMethod'];
$this->deleteOperationMethod = $options['deleteOperationMethod'];
$this->additionalArgs = $options['additionalOperationArguments'];
$this->operationStatusMethod = $options['operationStatusMethod'];
$this->operationStatusDoneValue = $options['operationStatusDoneValue'];
$this->operationErrorCodeMethod = $options['operationErrorCodeMethod'];
$this->operationErrorMessageMethod = $options['operationErrorMessageMethod'];
if (isset($options['initialPollDelayMillis'])) {
$this->defaultPollSettings['initialPollDelayMillis'] = $options['initialPollDelayMillis'];
}
if (isset($options['pollDelayMultiplier'])) {
$this->defaultPollSettings['pollDelayMultiplier'] = $options['pollDelayMultiplier'];
}
if (isset($options['maxPollDelayMillis'])) {
$this->defaultPollSettings['maxPollDelayMillis'] = $options['maxPollDelayMillis'];
}
if (isset($options['totalPollTimeoutMillis'])) {
$this->defaultPollSettings['totalPollTimeoutMillis'] = $options['totalPollTimeoutMillis'];
}
}
/**
* Check whether the operation has completed.
*
* @return bool
*/
public function isDone()
{
if (!$this->hasProtoResponse()) {
return false;
}
$status = call_user_func([$this->lastProtoResponse, $this->operationStatusMethod]);
if (is_null($status)) {
return false;
}
return $status === $this->operationStatusDoneValue;
}
/**
* Check whether the operation completed successfully. If the operation is not complete, or if the operation
* failed, return false.
*
* @return bool
*/
public function operationSucceeded()
{
if (!$this->hasProtoResponse()) {
return false;
}
if (!$this->canHaveResult()) {
// For Operations which do not have a result, we consider a successful
// operation when the operation has completed without errors.
return $this->isDone() && !$this->hasErrors();
}
return !is_null($this->getResult());
}
/**
* Check whether the operation failed. If the operation is not complete, or if the operation
* succeeded, return false.
*
* @return bool
*/
public function operationFailed()
{
return $this->hasErrors();
}
/**
* Get the formatted name of the operation
*
* @return string The formatted name of the operation
*/
public function getName()
{
return $this->operationName;
}
/**
* Poll the server in a loop until the operation is complete.
*
* Return true if the operation completed, otherwise return false. If the
* $options['totalPollTimeoutMillis'] setting is not set (or set <= 0) then
* pollUntilComplete will continue polling until the operation completes,
* and therefore will always return true.
*
* @param array $options {
* Options for configuring the polling behaviour.
*
* @type int $initialPollDelayMillis The initial polling interval to use, in milliseconds.
* @type int $pollDelayMultiplier Multiplier applied to the polling interval on each retry.
* @type int $maxPollDelayMillis The maximum polling interval to use, in milliseconds.
* @type int $totalPollTimeoutMillis The maximum amount of time to continue polling, in milliseconds.
* }
* @throws ApiException If an API call fails.
* @throws ValidationException
* @return bool Indicates if the operation completed.
*/
public function pollUntilComplete($options = [])
{
if ($this->isDone()) {
return true;
}
$pollSettings = array_merge($this->defaultPollSettings, $options);
return $this->poll(function () {
$this->reload();
return $this->isDone();
}, $pollSettings);
}
/**
* Reload the status of the operation with a request to the service.
*
* @throws ApiException If the API call fails.
* @throws ValidationException If called on a deleted operation.
*/
public function reload()
{
if ($this->deleted) {
throw new ValidationException("Cannot call reload() on a deleted operation");
}
$this->lastProtoResponse = $this->operationsCall(
$this->getOperationMethod,
$this->getName(),
$this->additionalArgs
);
}
/**
* Return the result of the operation. If operationSucceeded() is false, return null.
*
* @return mixed|null The result of the operation, or null if operationSucceeded() is false
*/
public function getResult()
{
if (!$this->hasProtoResponse()) {
return null;
}
if (!$this->canHaveResult()) {
return null;
}
if (!$this->isDone()) {
return null;
}
/** @var Any $anyResponse */
$anyResponse = $this->lastProtoResponse->getResponse();
if (is_null($anyResponse)) {
return null;
}
if (is_null($this->operationReturnType)) {
return $anyResponse;
}
$operationReturnType = $this->operationReturnType;
/** @var Message $response */
$response = new $operationReturnType();
$response->mergeFromString($anyResponse->getValue());
return $response;
}
/**
* If the operation failed, return the status. If operationFailed() is false, return null.
*
* @return Status|null The status of the operation in case of failure, or null if
* operationFailed() is false.
*/
public function getError()
{
if (!$this->hasProtoResponse() || !$this->isDone()) {
return null;
}
if ($this->operationErrorCodeMethod || $this->operationErrorMessageMethod) {
$errorCode = $this->operationErrorCodeMethod
? call_user_func([$this->lastProtoResponse, $this->operationErrorCodeMethod])
: null;
$errorMessage = $this->operationErrorMessageMethod
? call_user_func([$this->lastProtoResponse, $this->operationErrorMessageMethod])
: null;
return (new Status())
->setCode(ApiStatus::rpcCodeFromHttpStatusCode($errorCode))
->setMessage($errorMessage);
}
if (method_exists($this->lastProtoResponse, 'getError')) {
return $this->lastProtoResponse->getError();
}
return null;
}
/**
* Get an array containing the values of 'operationReturnType', 'metadataReturnType', and
* the polling options `initialPollDelayMillis`, `pollDelayMultiplier`, `maxPollDelayMillis`,
* and `totalPollTimeoutMillis`. The array can be passed as the $options argument to the
* constructor when creating another OperationResponse object.
*
* @return array
*/
public function getDescriptorOptions()
{
return [
'operationReturnType' => $this->operationReturnType,
'metadataReturnType' => $this->metadataReturnType,
] + $this->defaultPollSettings;
}
/**
* @return Operation|mixed|null The last Operation object received from the server.
*/
public function getLastProtoResponse()
{
return $this->lastProtoResponse;
}
/**
* @return object The OperationsClient object used to make
* requests to the operations API.
*/
public function getOperationsClient()
{
return $this->operationsClient;
}
/**
* Cancel the long-running operation.
*
* For operations of type Google\LongRunning\Operation, this method starts
* asynchronous cancellation on a long-running operation. The server
* makes a best effort to cancel the operation, but success is not
* guaranteed. If the server doesn't support this method, it will throw an
* ApiException with code \Google\Rpc\Code::UNIMPLEMENTED. Clients can continue
* to use reload and pollUntilComplete methods to check whether the cancellation
* succeeded or whether the operation completed despite cancellation.
* On successful cancellation, the operation is not deleted; instead, it becomes
* an operation with a getError() value with a \Google\Rpc\Status code of 1,
* corresponding to \Google\Rpc\Code::CANCELLED.
*
* @throws ApiException If the API call fails.
* @throws LogicException If the API call method has not been configured
*/
public function cancel()
{
if (is_null($this->cancelOperationMethod)) {
throw new LogicException('The cancel operation is not supported by this API');
}
$this->operationsCall($this->cancelOperationMethod, $this->getName(), $this->additionalArgs);
}
/**
* Delete the long-running operation.
*
* For operations of type Google\LongRunning\Operation, this method
* indicates that the client is no longer interested in the operation result.
* It does not cancel the operation. If the server doesn't support this method,
* it will throw an ApiException with code \Google\Rpc\Code::UNIMPLEMENTED.
*
* @throws ApiException If the API call fails.
* @throws LogicException If the API call method has not been configured
*/
public function delete()
{
if (is_null($this->deleteOperationMethod)) {
throw new LogicException('The delete operation is not supported by this API');
}
$this->operationsCall($this->deleteOperationMethod, $this->getName(), $this->additionalArgs);
$this->deleted = true;
}
/**
* Get the metadata returned with the last proto response. If a metadata type was provided, then
* the return value will be of that type - otherwise, the return value will be of type Any. If
* no metadata object is available, returns null.
*
* @return mixed The metadata returned from the server in the last response.
*/
public function getMetadata()
{
if (!$this->hasProtoResponse()) {
return null;
}
if (!method_exists($this->lastProtoResponse, 'getMetadata')) {
// The call to getMetadata is only for OnePlatform LROs, and is not
// supported by other LRO GAPIC clients (e.g. Compute)
return null;
}
/** @var Any $any */
$any = $this->lastProtoResponse->getMetadata();
if (is_null($this->metadataReturnType)) {
return $any;
}
if (is_null($any) || is_null($any->getValue())) {
return null;
}
$metadataReturnType = $this->metadataReturnType;
/** @var Message $metadata */
$metadata = new $metadataReturnType();
$metadata->mergeFromString($any->getValue());
return $metadata;
}
private function operationsCall($method, $name, array $additionalArgs)
{
$args = array_merge([$name], $additionalArgs);
return call_user_func_array([$this->operationsClient, $method], $args);
}
private function canHaveResult()
{
// The call to getResponse is only for OnePlatform LROs, and is not
// supported by other LRO GAPIC clients (e.g. Compute)
return method_exists($this->lastProtoResponse, 'getResponse');
}
private function hasErrors()
{
if (!$this->hasProtoResponse()) {
return false;
}
if (method_exists($this->lastProtoResponse, 'getError')) {
return !empty($this->lastProtoResponse->getError());
}
if ($this->operationErrorCodeMethod) {
$errorCode = call_user_func([$this->lastProtoResponse, $this->operationErrorCodeMethod]);
return !empty($errorCode);
}
// This should never happen unless an API is misconfigured
throw new LogicException('Unable to determine operation error status for this service');
}
private function hasProtoResponse()
{
return !is_null($this->lastProtoResponse);
}
}
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