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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Queue
* @subpackage Stomp
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Connection.php 17241 2009-07-28 13:01:20Z matthew $
*/
/**
* @see Zend_Queue_Stomp_Client_ConnectionInterface
*/
require_once 'Zend/Queue/Stomp/Client/ConnectionInterface.php';
/**
* The Stomp client interacts with a Stomp server.
*
* @category Zend
* @package Zend_Queue
* @subpackage Stomp
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Queue_Stomp_Client_Connection
implements Zend_Queue_Stomp_Client_ConnectionInterface
{
const READ_TIMEOUT_DEFAULT_USEC = 0; // 0 microseconds
const READ_TIMEOUT_DEFAULT_SEC = 5; // 5 seconds
/**
* Connection options
* @var array
*/
protected $_options;
/**
* tcp/udp socket
*
* @var resource
*/
protected $_socket = false;
/**
* open() opens a socket to the Stomp server
*
* @param array $options ('scheme', 'host', 'port')
* @param string $scheme
* @param string $host
* @param int $port
* @param array $options Accepts "timeout_sec" and "timeout_usec" keys
* @return true;
* @throws Zend_Queue_Exception
*/
public function open($scheme, $host, $port, array $options = array())
{
$str = $scheme . '://' . $host;
$this->_socket = fsockopen($str, $port, $errno, $errstr);
if ($this->_socket === false) {
// aparently there is some reason that fsockopen will return false
// but it normally throws an error.
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception("Unable to connect to $str; error = $errstr ( errno = $errno )");
}
stream_set_blocking($this->_socket, 0); // non blocking
if (!isset($options['timeout_sec'])) {
$options['timeout_sec'] = self::READ_TIMEOUT_DEFAULT_SEC;
}
if (! isset($options['timeout_usec'])) {
$options['timeout_usec'] = self::READ_TIMEOUT_DEFAULT_USEC;
}
$this->_options = $options;
return true;
}
/**
* Close the socket explicitly when destructed
*
* @return void
*/
public function __destruct()
{
}
/**
* Close connection
*
* @param boolean $destructor
* @return void
*/
public function close($destructor = false)
{
// Gracefully disconnect
if (!$destructor) {
$frame = $this->createFrame();
$frame->setCommand('DISCONNECT');
$this->write($frame);
}
// @todo: Should be fixed.
// When the socket is "closed", it will trigger the below error when php exits
// Fatal error: Exception thrown without a stack frame in Unknown on line 0
// Danlo: I suspect this is because this has already been claimed by the interpeter
// thus trying to shutdown this resources, which is already shutdown is a problem.
if (is_resource($this->_socket)) {
// fclose($this->_socket);
}
// $this->_socket = null;
}
/**
* Check whether we are connected to the server
*
* @return true
* @throws Zend_Queue_Exception
*/
public function ping()
{
if (!is_resource($this->_socket)) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Not connected to Stomp server');
}
return true;
}
/**
* Write a frame to the stomp server
*
* @example $response = $client->write($frame)->read();
*
* @param Zend_Queue_Stom_FrameInterface $frame
* @return $this
*/
public function write(Zend_Queue_Stomp_FrameInterface $frame)
{
$this->ping();
$output = $frame->toFrame();
$bytes = fwrite($this->_socket, $output, strlen($output));
if ($bytes === false || $bytes == 0) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('No bytes written');
}
return $this;
}
/**
* Tests the socket to see if there is data for us
*
* @return boolean
*/
public function canRead()
{
$read = array($this->_socket);
$write = null;
$except = null;
return stream_select(
$read,
$write,
$except,
$this->_options['timeout_sec'],
$this->_options['timeout_usec']
) == 1;
// see http://us.php.net/manual/en/function.stream-select.php
}
/**
* Reads in a frame from the socket or returns false.
*
* @return Zend_Queue_Stomp_FrameInterface|false
* @throws Zend_Queue_Exception
*/
public function read()
{
$this->ping();
$response = '';
$prev = '';
// while not end of file.
while (!feof($this->_socket)) {
// read in one character until "\0\n" is found
$data = fread($this->_socket, 1);
// check to make sure that the connection is not lost.
if ($data === false) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Connection lost');
}
// append last character read to $response
$response .= $data;
// is this \0 (prev) \n (data)? END_OF_FRAME
if (ord($data) == 10 && ord($prev) == 0) {
break;
}
$prev = $data;
}
if ($response === '') {
return false;
}
$frame = $this->createFrame();
$frame->fromFrame($response);
return $frame;
}
/**
* Set the frameClass to be used
*
* This must be a Zend_Queue_Stomp_FrameInterface.
*
* @param string $classname - class is an instance of Zend_Queue_Stomp_FrameInterface
* @return $this;
*/
public function setFrameClass($classname)
{
$this->_options['frameClass'] = $classname;
return $this;
}
/**
* Get the frameClass
*
* @return string
*/
public function getFrameClass()
{
return isset($this->_options['frameClass'])
? $this->_options['frameClass']
: 'Zend_Queue_Stomp_Frame';
}
/**
* Create an empty frame
*
* @return Zend_Queue_Stomp_FrameInterface
*/
public function createFrame()
{
$class = $this->getFrameClass();
if (!class_exists($class)) {
require_once 'Zend/Loader.php';
Zend_Loader::loadClass($class);
}
$frame = new $class();
if (!$frame instanceof Zend_Queue_Stomp_FrameInterface) {
require_once 'Zend/Queue/Exception.php';
throw new Zend_Queue_Exception('Invalid Frame class provided; must implement Zend_Queue_Stomp_FrameInterface');
}
return $frame;
}
}
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