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<?php
/**
* Based on code from Stomp PHP library, working around bugs in the base class.
*
* Original code is copyright 2005-2006 The Apache Software Foundation
* Modifications copyright 2009 StatusNet Inc by Brion Vibber <brion@status.net>
*
* 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.
*/
class LiberalStomp extends Stomp
{
/**
* We need to be able to get the socket so advanced daemons can
* do a select() waiting for input both from the queue and from
* other sources such as an XMPP connection.
*
* @return resource
*/
function getSocket()
{
return $this->_socket;
}
/**
* Return the host we're currently connected to.
*
* @return string
*/
function getServer()
{
$idx = $this->_currentHost;
if ($idx >= 0) {
$host = $this->_hosts[$idx];
return "$host[0]:$host[1]";
} else {
return '[unconnected]';
}
}
/**
* Make socket connection to the server
* We also set the stream to non-blocking mode, since we'll be
* select'ing to wait for updates. In blocking mode it seems
* to get confused sometimes.
*
* @throws StompException
*/
protected function _makeConnection ()
{
parent::_makeConnection();
stream_set_blocking($this->_socket, 0);
}
/**
* Version 1.0.0 of the Stomp library gets confused if messages
* come in too fast over the connection. This version will read
* out as many frames as are ready to be read from the socket.
*
* Modified from Stomp::readFrame()
*
* @return StompFrame False when no frame to read
*/
public function readFrames ()
{
if (!$this->hasFrameToRead()) {
return false;
}
$rb = 1024;
$data = '';
$end = false;
$frames = array();
do {
// @fixme this sometimes hangs in blocking mode...
// shouldn't we have been idle until we found there's more data?
$read = fread($this->_socket, $rb);
if ($read === false || ($read === '' && feof($this->_socket))) {
// @fixme possibly attempt an auto reconnect as old code?
throw new StompException("Error reading");
//$this->_reconnect();
// @fixme this will lose prior items
//return $this->readFrames();
}
$data .= $read;
if (strpos($data, "\x00") !== false) {
// Frames are null-delimited, but some servers
// may append an extra \n according to old bug reports.
$data = str_replace("\x00\n", "\x00", $data);
$chunks = explode("\x00", $data);
$data = array_pop($chunks);
$frames = array_merge($frames, $chunks);
if ($data == '') {
// We're at the end of a frame; stop reading.
break;
} else {
// In the middle of a frame; keep going.
}
}
// @fixme find out why this len < 2 check was there
//$len = strlen($data);
} while (true);//$len < 2 || $end == false);
return array_map(array($this, 'parseFrame'), $frames);
}
/**
* Parse a raw Stomp frame into an object.
* Extracted from Stomp::readFrame()
*
* @param string $data
* @return StompFrame
*/
function parseFrame($data)
{
list ($header, $body) = explode("\n\n", $data, 2);
$header = explode("\n", $header);
$headers = array();
$command = null;
foreach ($header as $v) {
if (isset($command)) {
list ($name, $value) = explode(':', $v, 2);
$headers[$name] = $value;
} else {
$command = $v;
}
}
$frame = new StompFrame($command, $headers, trim($body));
if (isset($frame->headers['transformation']) && $frame->headers['transformation'] == 'jms-map-json') {
require_once 'Stomp/Message/Map.php';
return new StompMessageMap($frame);
} else {
return $frame;
}
return $frame;
}
/**
* Write frame to server
*
* @param StompFrame $stompFrame
*/
protected function _writeFrame (StompFrame $stompFrame)
{
if (!is_resource($this->_socket)) {
require_once 'Stomp/Exception.php';
throw new StompException('Socket connection hasn\'t been established');
}
$data = $stompFrame->__toString();
// Make sure the socket's in a writable state; if not, wait a bit.
stream_set_blocking($this->_socket, 1);
$r = fwrite($this->_socket, $data, strlen($data));
stream_set_blocking($this->_socket, 0);
if ($r === false || $r == 0) {
$this->_reconnect();
$this->_writeFrame($stompFrame);
}
}
}
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