355 lines
11 KiB
PHP
355 lines
11 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2017 (original work) Open Assessment Technologies SA (under the project TAO-PRODUCT);
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*
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*/
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namespace oat\taoTaskQueue\model\QueueBroker;
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use Aws\Exception\AwsException;
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use Aws\Sqs\SqsClient;
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use oat\awsTools\AwsClient;
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use oat\tao\model\taskQueue\Queue\Broker\AbstractQueueBroker;
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use oat\tao\model\taskQueue\Task\TaskInterface;
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/**
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* Storing messages/tasks on AWS SQS.
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*
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* @author Gyula Szucs <gyula@taotesting.com>
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*/
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class SqsQueueBroker extends AbstractQueueBroker
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{
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public const DEFAULT_AWS_CLIENT_KEY = 'generis/awsClient';
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public const ID ='sqs';
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private $cacheId;
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/**
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* @var SqsClient
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*/
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private $client;
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private $queueUrl;
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/**
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* @var \common_cache_Cache
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*/
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private $cache;
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/**
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* SqsQueueBroker constructor.
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*
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* @param string $cacheServiceId
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* @param int $receiveTasks
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*/
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public function __construct($cacheServiceId, $receiveTasks = 1)
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{
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parent::__construct($receiveTasks);
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if (empty($cacheServiceId)) {
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throw new \InvalidArgumentException("Cache Service needs to be set for " . __CLASS__);
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}
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$this->cacheId = $cacheServiceId;
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}
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public function __toPhpCode()
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{
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return 'new ' . get_called_class() . '('
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. \common_Utils::toHumanReadablePhpString($this->cacheId)
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. ', '
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. \common_Utils::toHumanReadablePhpString($this->getNumberOfTasksToReceive())
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. ')';
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}
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/**
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* @return SqsClient
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*/
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protected function getClient()
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{
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if (is_null($this->client)) {
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if (!$this->getServiceLocator()->has(self::DEFAULT_AWS_CLIENT_KEY)) {
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throw new \RuntimeException('Unable to load driver for ' . __CLASS__ . ', most likely generis/awsClient.conf.php does not exist.');
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}
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/** @var AwsClient $awsClient */
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$awsClient = $this->getServiceLocator()->get(self::DEFAULT_AWS_CLIENT_KEY);
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$this->client = $awsClient->getSqsClient();
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}
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return $this->client;
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}
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/**
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* @return \common_cache_Cache
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*/
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protected function getCache()
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{
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if (is_null($this->cache)) {
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$this->cache = $this->getServiceLocator()->get($this->cacheId);
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}
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return $this->cache;
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}
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/**
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* Creates queue.
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*/
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public function createQueue()
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{
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try {
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// Note: we are creating a Standard Queue for the time being.
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// More development needed to be able to customize it, for example creating FIFO Queue or setting attributes from outside.
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/** @see http://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sqs-2012-11-05.html#createqueue */
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$result = $this->getClient()->createQueue([
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'QueueName' => $this->getQueueNameWithPrefix(),
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'Attributes' => [
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'DelaySeconds' => 0,
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'VisibilityTimeout' => 600
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]
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]);
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if ($result->hasKey('QueueUrl')) {
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$this->queueUrl = $result->get('QueueUrl');
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$this->getCache()->put($this->getUrlCacheKey(), $this->queueUrl);
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$this->logDebug('Queue ' . $this->queueUrl . ' created and cached');
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} else {
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$this->logError('Queue ' . $this->getQueueNameWithPrefix() . ' not created');
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}
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} catch (AwsException $e) {
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$this->logError('Creating queue ' . $this->getQueueNameWithPrefix() . ' failed with MSG: ' . $e->getMessage());
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if (PHP_SAPI == 'cli') {
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throw $e;
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}
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}
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}
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/**
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* @param TaskInterface $task
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* @return bool
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*/
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public function push(TaskInterface $task)
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{
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// ensures that the SQS Queue exist
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if (!$this->queueExists()) {
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$this->createQueue();
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}
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$logContext = [
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'QueueUrl' => $this->queueUrl,
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'InternalMessageId' => $task->getId()
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];
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try {
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$result = $this->getClient()->sendMessage([
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'MessageAttributes' => [],
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'MessageBody' => $this->serializeTask($task),
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'QueueUrl' => $this->queueUrl
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]);
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if ($result->hasKey('MessageId')) {
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$this->logDebug('Message pushed to SQS', array_merge($logContext, [
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'SqsMessageId' => $result->get('MessageId')
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]));
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return true;
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} else {
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$this->logError('Message seems not received by SQS.', $logContext);
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}
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} catch (AwsException $e) {
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$this->logError('Pushing message failed with MSG: ' . $e->getAwsErrorMessage(), $logContext);
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}
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return false;
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}
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/**
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* Does the SQS specific pop mechanism.
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*
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* @see http://docs.aws.amazon.com/aws-sdk-php/v3/api/api-sqs-2012-11-05.html#shape-message
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*/
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protected function doPop()
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{
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// ensures that the SQS Queue exist
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if (!$this->queueExists()) {
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$this->createQueue();
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}
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$logContext = [
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'QueueUrl' => $this->queueUrl
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];
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try {
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$result = $this->getClient()->receiveMessage([
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'AttributeNames' => [], //nothing
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'MaxNumberOfMessages' => $this->getNumberOfTasksToReceive(),
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'MessageAttributeNames' => [], //nothing
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'QueueUrl' => $this->queueUrl,
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'WaitTimeSeconds' => 20 //retrieving messages with Long Polling
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]);
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if (count($result->get('Messages')) > 0) {
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$this->logDebug('Received ' . count($result->get('Messages')) . ' messages.', $logContext);
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foreach ($result->get('Messages') as $message) {
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$task = $this->unserializeTask($message['Body'], $message['ReceiptHandle'], [
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'SqsMessageId' => $message['MessageId']
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]);
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if ($task) {
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$task->setMetadata('SqsMessageId', $message['MessageId']);
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$task->setMetadata('ReceiptHandle', $message['ReceiptHandle']);
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$this->pushPreFetchedMessage($task);
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}
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}
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} else {
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$this->logDebug('No messages in queue.', $logContext);
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}
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} catch (AwsException $e) {
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$this->logError('Popping tasks failed with MSG: ' . $e->getAwsErrorMessage(), $logContext);
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}
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}
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/**
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* @param TaskInterface $task
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*/
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public function delete(TaskInterface $task)
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{
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$this->doDelete($task->getMetadata('ReceiptHandle'), [
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'InternalMessageId' => $task->getId(),
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'SqsMessageId' => $task->getMetadata('SqsMessageId')
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]);
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}
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/**
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* Delete a task by its receipt.
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*
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* @param string $receipt
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* @param array $logContext
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*/
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protected function doDelete($receipt, array $logContext = [])
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{
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// ensures that the SQS Queue exist
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if (!$this->queueExists()) {
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$this->createQueue();
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}
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$logContext = array_merge([
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'QueueUrl' => $this->queueUrl
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], $logContext);
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try {
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$this->getClient()->deleteMessage([
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'QueueUrl' => $this->queueUrl,
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'ReceiptHandle' => $receipt
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]);
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$this->logDebug('Task deleted from queue.', $logContext);
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} catch (AwsException $e) {
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$this->logError('Deleting task failed with MSG: ' . $e->getAwsErrorMessage(), $logContext);
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}
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}
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/**
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* @return int
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*/
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public function count()
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{
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// ensures that the SQS Queue exist
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if (!$this->queueExists()) {
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$this->createQueue();
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}
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try {
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$result = $this->getClient()->getQueueAttributes([
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'QueueUrl' => $this->queueUrl,
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'AttributeNames' => ['ApproximateNumberOfMessages'],
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]);
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if (isset($result['Attributes']['ApproximateNumberOfMessages'])) {
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return (int) $result['Attributes']['ApproximateNumberOfMessages'];
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}
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} catch (AwsException $e) {
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$this->logError('Counting tasks failed with MSG: ' . $e->getAwsErrorMessage());
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}
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return 0;
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}
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/**
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* Checks if queue exists
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*
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* @return bool
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*/
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protected function queueExists()
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{
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if (isset($this->queueUrl)) {
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return true;
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}
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if ($this->getCache()->has($this->getUrlCacheKey())) {
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$this->queueUrl = $this->getCache()->get($this->getUrlCacheKey());
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return true;
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}
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try {
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$result = $this->getClient()->getQueueUrl([
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'QueueName' => $this->getQueueNameWithPrefix()
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]);
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$this->queueUrl = $result->get('QueueUrl');
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if ($result->hasKey('QueueUrl')) {
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$this->queueUrl = $result->get('QueueUrl');
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} else {
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$this->logError('Queue url for' . $this->getQueueNameWithPrefix() . ' not fetched');
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}
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if ($this->queueUrl !== null) {
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$this->getCache()->put($this->queueUrl, $this->getUrlCacheKey());
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$this->logDebug('Queue url ' . $this->queueUrl . ' fetched and cached');
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return true;
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}
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} catch (AwsException $e) {
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$this->logWarning('Fetching queue url for ' . $this->getQueueNameWithPrefix() . ' failed. MSG: ' . $e->getAwsErrorMessage());
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}
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return false;
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}
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/**
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* @return string
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*/
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private function getUrlCacheKey()
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{
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return $this->getQueueNameWithPrefix() . '_url';
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}
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/**
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* SQS can return max 10 messages at once.
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*
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* @return int
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*/
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public function getNumberOfTasksToReceive()
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{
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return parent::getNumberOfTasksToReceive() > 10 ? 10 : parent::getNumberOfTasksToReceive();
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}
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}
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