function gda_worker_main()
{
global $init_shared;
global $cmdfile;
global $replyfile;
$reply = new SimpleXMLElement("<reply></reply>");
$reply->addChild('session', htmlspecialchars(SID));
$reply->addChild('status', "OK");
$reply->addChild("counter", $_SESSION["counter"]);
echo gda_add_hash($init_shared, $reply->asXml());
flush();
ob_flush();
/* set max execution time to 10s */
set_time_limit(10);
while (1) {
$doquit = false;
try {
if (!file_exists($cmdfile)) {
throw new GdaException("Bad setup", true);
}
//echo "Reading from fifo...\n"; flush (); ob_flush();
$file = fopen($cmdfile, "r+");
stream_set_blocking($file, false);
while (1) {
$readers = array($file);
if (stream_select($readers, $writers = null, $except = null, 5, 0) < 1) {
/* More waiting... */
echo chr(0);
flush();
ob_flush();
// send something to the client to test connection
if (connection_status() != 0) {
fclose($file);
exit(0);
break;
}
continue;
} else {
/* data available to read */
break;
}
}
$datafile = fread($file, 8192);
fclose($file);
$text = file_get_contents($datafile);
@unlink($datafile);
if ($text == false) {
throw new GdaException('Could not read command', false);
}
//echo "COMMAND [$datafile]\n"; flush (); ob_flush();
$array = split("\n", $text, 2);
if (sizeof($array) != 2) {
throw new GdaException('Missing message hash', true);
}
if ($array[0][0] == "<") {
throw new GdaException('Bad message hash', true);
}
if ($array[0] != "NOHASH" || isset($_SESSION['key'])) {
$hash = hmac($_SESSION['key'], $array[1]);
if ($array[0] != $hash) {
throw new GdaException('Bad message hash', true);
}
}
if ($array[1][0] != "<") {
throw new GdaException('Bad message format', true);
}
$xml = simplexml_load_string($array[1]);
$retval = gda_handle_xml($xml, $doquit);
/* send reply */
try {
send_reply($retval);
} catch (Exception $e) {
/* will be caught by the listening thread */
echo $retval;
}
} catch (GdaException $e) {
$reply = new SimpleXMLElement("<reply></reply>");
if (!$e->cnc_closed) {
$chal = rand_str();
$_SESSION['challenge'] = $chal;
$reply->addChild('challenge', $chal);
if (isset($debug) && $debug) {
$reply->addChild('session', htmlspecialchars(SID));
}
$node = $reply->addChild('status', "ERROR");
} else {
$_SESSION["cncclosed"] = true;
$doquit = true;
$node = $reply->addChild('status', "CLOSED");
}
$node->addAttribute("error", $e->getMessage());
$reply->addChild("counter", $_SESSION["counter"]);
if (isset($_SESSION['key'])) {
$retval = gda_add_hash($_SESSION['key'], $reply->asXml());
} else {
$retval = gda_add_hash("", $reply->asXml());
}
try {
send_reply($retval);
} catch (Exception $e) {
/* will be caught by the listening thread */
echo $retval;
}
}
//echo "REPLY [$retval]\n";
flush();
ob_flush();
if ($doquit) {
break;
}
}
}
}
// read $len bytes for the actual payload and assume it's a JSON object.
$msg = fread($in, $len);
$rq = json_decode($msg);
// TODO validation - was it valid json?
$pis = get_matches($rq);
// don't reply with anything if there were no matches:
if (count($pis) == 0) {
continue;
}
$res = new stdclass();
$res->_msgtype = "results";
$res->qid = $rq->qid;
$res->results = array();
$res->results = $pis;
send_reply($res);
}
// put a 4-byte big-endian int first, denoting length of message
function send_reply($obj)
{
// i think json_spirit rejects \/ even tho it's valid json. doh.
$str = str_replace('\\/', '/', json_encode($obj));
print pack('N', strlen($str));
print $str;
}
// this might return multiple objects if it did a proper search:
// for now it only matches one song because it's just a demo.
function get_matches($rq)
{
global $magnatune;
$tracks = @$magnatune[metaphone($rq->artist)][metaphone($rq->track)];
