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437 lines
14 KiB
PHP
437 lines
14 KiB
PHP
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Service
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* @subpackage Amazon_Sqs
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Sqs.php 16590 2009-07-09 20:04:16Z matthew $
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*/
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/**
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* @see Zend_Service_Amazon_Abstract
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*/
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require_once 'Zend/Service/Amazon/Abstract.php';
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/**
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* @see Zend_Crypt_Hmac
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*/
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require_once 'Zend/Crypt/Hmac.php';
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/**
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* Class for connecting to the Amazon Simple Queue Service (SQS)
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*
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* @category Zend
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* @package Service
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* @subpackage Amazon_Sqs
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @see http://aws.amazon.com/sqs/ Amazon Simple Queue Service
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*/
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class Zend_Service_Amazon_Sqs extends Zend_Service_Amazon_Abstract
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{
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/**
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* Default timeout for createQueue() function
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*/
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const CREATE_TIMEOUT_DEFAULT = 30;
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/**
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* HTTP end point for the Amazon SQS service
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*/
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protected $_sqsEndpoint = 'queue.amazonaws.com';
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/**
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* The API version to use
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*/
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protected $_sqsApiVersion = '2009-02-01';
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/**
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* Signature Version
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*/
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protected $_sqsSignatureVersion = '2';
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/**
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* Signature Encoding Method
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*/
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protected $_sqsSignatureMethod = 'HmacSHA256';
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/**
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* Constructor
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*
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* @param string $accessKey
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* @param string $secretKey
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* @param string $region
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*/
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public function __construct($accessKey = null, $secretKey = null, $region = null)
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{
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parent::__construct($accessKey, $secretKey, $region);
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}
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/**
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* Create a new queue
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*
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* Visibility timeout is how long a message is left in the queue "invisible"
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* to other readers. If the message is acknowleged (deleted) before the
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* timeout, then the message is deleted. However, if the timeout expires
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* then the message will be made available to other queue readers.
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*
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* @param string $queue_name queue name
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* @param integer $timeout default visibility timeout
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* @return string|boolean
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function create($queue_name, $timeout = null)
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{
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$params = array();
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$params['QueueName'] = $queue_name;
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$timeout = ($timeout === null) ? self::CREATE_TIMEOUT_DEFAULT : (int)$timeout;
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$params['DefaultVisibilityTimeout'] = $timeout;
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$retry_count = 0;
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do {
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$retry = false;
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$result = $this->_makeRequest(null, 'CreateQueue', $params);
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if ($result->CreateQueueResult->QueueUrl === null) {
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if ($result->Error->Code == 'AWS.SimpleQueueService.QueueNameExists') {
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return false;
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} elseif ($result->Error->Code == 'AWS.SimpleQueueService.QueueDeletedRecently') {
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// Must sleep for 60 seconds, then try re-creating the queue
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sleep(60);
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$retry = true;
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$retry_count++;
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} else {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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}
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} else {
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return (string) $result->CreateQueueResult->QueueUrl;
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}
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} while ($retry);
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return false;
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}
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/**
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* Delete a queue and all of it's messages
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*
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* Returns false if the queue is not found, true if the queue exists
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*
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* @param string $queue_url queue URL
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* @return boolean
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function delete($queue_url)
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{
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$result = $this->_makeRequest($queue_url, 'DeleteQueue');
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if ($result->Error->Code !== null) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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}
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return true;
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}
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/**
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* Get an array of all available queues
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*
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* @return array
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function getQueues()
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{
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$result = $this->_makeRequest(null, 'ListQueues');
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if ($result->ListQueuesResult->QueueUrl === null) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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}
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$queues = array();
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foreach ($result->ListQueuesResult->QueueUrl as $queue_url) {
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$queues[] = (string)$queue_url;
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}
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return $queues;
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}
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/**
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* Return the approximate number of messages in the queue
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*
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* @param string $queue_url Queue URL
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* @return integer
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function count($queue_url)
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{
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return (int)$this->getAttribute($queue_url, 'ApproximateNumberOfMessages');
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}
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/**
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* Send a message to the queue
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*
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* @param string $queue_url Queue URL
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* @param string $message Message to send to the queue
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* @return string Message ID
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function send($queue_url, $message)
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{
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$params = array();
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$params['MessageBody'] = urlencode($message);
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$checksum = md5($params['MessageBody']);
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$result = $this->_makeRequest($queue_url, 'SendMessage', $params);
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if ($result->SendMessageResult->MessageId === null) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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} else if ((string) $result->SendMessageResult->MD5OfMessageBody != $checksum) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception('MD5 of body does not match message sent');
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}
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return (string) $result->SendMessageResult->MessageId;
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}
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/**
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* Get messages in the queue
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*
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* @param string $queue_url Queue name
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* @param integer $max_messages Maximum number of messages to return
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* @param integer $timeout Visibility timeout for these messages
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* @return array
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function receive($queue_url, $max_messages = null, $timeout = null)
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{
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$params = array();
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// If not set, the visibility timeout on the queue is used
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if ($timeout !== null) {
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$params['VisibilityTimeout'] = (int)$timeout;
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}
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// SQS will default to only returning one message
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if ($max_messages !== null) {
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$params['MaxNumberOfMessages'] = (int)$max_messages;
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}
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$result = $this->_makeRequest($queue_url, 'ReceiveMessage', $params);
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if ($result->ReceiveMessageResult->Message === null) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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}
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$data = array();
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foreach ($result->ReceiveMessageResult->Message as $message) {
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$data[] = array(
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'message_id' => (string)$message->MessageId,
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'handle' => (string)$message->ReceiptHandle,
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'md5' => (string)$message->MD5OfBody,
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'body' => urldecode((string)$message->Body),
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);
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}
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return $data;
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}
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/**
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* Delete a message from the queue
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*
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* Returns true if the message is deleted, false if the deletion is
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* unsuccessful.
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*
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* @param string $queue_url Queue URL
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* @param string $handle Message handle as returned by SQS
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* @return boolean
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function deleteMessage($queue_url, $handle)
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{
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$params = array();
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$params['ReceiptHandle'] = (string)$handle;
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$result = $this->_makeRequest($queue_url, 'DeleteMessage', $params);
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if ($result->Error->Code !== null) {
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return false;
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}
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// Will always return true unless ReceiptHandle is malformed
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return true;
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}
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/**
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* Get the attributes for the queue
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*
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* @param string $queue_url Queue URL
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* @param string $attribute
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* @return string
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* @throws Zend_Service_Amazon_Sqs_Exception
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*/
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public function getAttribute($queue_url, $attribute = 'All')
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{
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$params = array();
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$params['AttributeName'] = $attribute;
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$result = $this->_makeRequest($queue_url, 'GetQueueAttributes', $params);
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if ($result->GetQueueAttributesResult->Attribute === null) {
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require_once 'Zend/Service/Amazon/Sqs/Exception.php';
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throw new Zend_Service_Amazon_Sqs_Exception($result->Error->Code);
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}
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return (string) $result->GetQueueAttributesResult->Attribute->Value;
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}
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/**
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* Make a request to Amazon SQS
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*
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* @param string $queue Queue Name
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* @param string $action SQS action
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* @param array $params
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* @return SimpleXMLElement
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*/
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private function _makeRequest($queue_url, $action, $params = array())
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{
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$params['Action'] = $action;
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$params = $this->addRequiredParameters($queue_url, $params);
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if ($queue_url === null) {
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$queue_url = '/';
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}
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$client = self::getHttpClient();
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switch ($action) {
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case 'ListQueues':
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case 'CreateQueue':
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$client->setUri('http://'.$this->_sqsEndpoint);
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break;
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default:
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$client->setUri($queue_url);
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break;
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}
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$retry_count = 0;
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do {
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$retry = false;
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$client->resetParameters();
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$client->setParameterGet($params);
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$response = $client->request('GET');
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$response_code = $response->getStatus();
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// Some 5xx errors are expected, so retry automatically
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if ($response_code >= 500 && $response_code < 600 && $retry_count <= 5) {
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$retry = true;
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$retry_count++;
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sleep($retry_count / 4 * $retry_count);
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}
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} while ($retry);
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unset($client);
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return new SimpleXMLElement($response->getBody());
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}
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/**
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* Adds required authentication and version parameters to an array of
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* parameters
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*
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* The required parameters are:
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* - AWSAccessKey
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* - SignatureVersion
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* - Timestamp
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* - Version and
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* - Signature
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*
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* If a required parameter is already set in the <tt>$parameters</tt> array,
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* it is overwritten.
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*
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* @param string $queue_url Queue URL
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* @param array $parameters the array to which to add the required
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* parameters.
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* @return array
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*/
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protected function addRequiredParameters($queue_url, array $parameters)
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{
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$parameters['AWSAccessKeyId'] = $this->_getAccessKey();
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$parameters['SignatureVersion'] = $this->_sqsSignatureVersion;
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$parameters['Timestamp'] = gmdate('Y-m-d\TH:i:s\Z', time()+10);
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$parameters['Version'] = $this->_sqsApiVersion;
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$parameters['SignatureMethod'] = $this->_sqsSignatureMethod;
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$parameters['Signature'] = $this->_signParameters($queue_url, $parameters);
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return $parameters;
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}
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/**
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* Computes the RFC 2104-compliant HMAC signature for request parameters
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*
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* This implements the Amazon Web Services signature, as per the following
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* specification:
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*
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* 1. Sort all request parameters (including <tt>SignatureVersion</tt> and
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* excluding <tt>Signature</tt>, the value of which is being created),
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* ignoring case.
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*
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* 2. Iterate over the sorted list and append the parameter name (in its
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* original case) and then its value. Do not URL-encode the parameter
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* values before constructing this string. Do not use any separator
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* characters when appending strings.
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*
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* @param string $queue_url Queue URL
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* @param array $parameters the parameters for which to get the signature.
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*
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* @return string the signed data.
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*/
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protected function _signParameters($queue_url, array $paramaters)
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{
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$data = "GET\n";
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$data .= $this->_sqsEndpoint . "\n";
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if ($queue_url !== null) {
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$data .= parse_url($queue_url, PHP_URL_PATH);
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}
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else {
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$data .= '/';
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}
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$data .= "\n";
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uksort($paramaters, 'strcmp');
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unset($paramaters['Signature']);
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$arrData = array();
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foreach($paramaters as $key => $value) {
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$arrData[] = $key . '=' . str_replace('%7E', '~', urlencode($value));
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}
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$data .= implode('&', $arrData);
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$hmac = Zend_Crypt_Hmac::compute($this->_getSecretKey(), 'SHA256', $data, Zend_Crypt_Hmac::BINARY);
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return base64_encode($hmac);
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}
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}
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