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<?php
/**
* Interface to the external task manager.
*/
class Taskmanager
{
private static $sock = false;
private static function init()
{
if (self::$sock !== false)
return;
self::$sock = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP);
socket_set_option(self::$sock, SOL_SOCKET, SO_RCVTIMEO, array('sec' => 0, 'usec' => 300000));
socket_set_option(self::$sock, SOL_SOCKET, SO_SNDTIMEO, array('sec' => 0, 'usec' => 200000));
socket_connect(self::$sock, '127.0.0.1', 9215);
}
public static function submit($task, $data = false, $async = false)
{
self::init();
$seq = (string) mt_rand();
if (empty($data)) {
$data = '{}';
} else {
$data = json_encode($data);
}
$message = "$seq, $task, $data";
$sent = socket_send(self::$sock, $message, strlen($message), 0);
if ($sent != strlen($message)) {
Message::addError('taskmanager-error');
return false;
}
if ($async)
return true;
$reply = self::readReply($seq);
if ($reply === false) {
Message::addError('taskmanager-error');
return false;
}
if (!is_array($reply)) {
Message::addError('taskmanager-format');
return false;
}
if (isset($reply['statusCode']) && $reply['statusCode'] === NO_SUCH_TASK) {
Message::addError('task-error', 'Ungültiger Task: ' . $task);
return false;
}
if (!isset($reply['id'])) {
Message::addError('taskmanager-format');
return false;
}
return $reply;
}
public static function status($taskId)
{
self::init();
$seq = (string) mt_rand();
$message = "$seq, status, $taskId";
$sent = socket_send(self::$sock, $message, strlen($message), 0);
$reply = self::readReply($seq);
if (!is_array($reply))
return false;
return $reply;
}
public static function waitComplete($task, $timeout = 1500)
{
if (is_array($task) && isset($task['id'])) {
if ($task['statusCode'] !== TASK_PROCESSING && $task['statusCode'] !== TASK_WAITING) {
self::release($task['id']);
return $task;
}
$task = $task['id'];
}
if (!is_string($task))
return false;
$done = false;
for ($i = 0; $i < ($timeout / 150); ++$i) {
$status = self::status($task);
if (!isset($status['statusCode']))
break;
if ($status['statusCode'] !== TASK_PROCESSING && $status['statusCode'] !== TASK_WAITING) {
$done = true;
break;
}
usleep(150000);
}
if ($done)
self::release($task);
return $status;
}
public static function isFailed($task)
{
if (!is_array($task) || !isset($task['statusCode']) || !isset($task['id']))
return true;
if ($task['statusCode'] !== TASK_WAITING && $task['statusCode'] !== TASK_PROCESSING && $task['statusCode'] !== TASK_FINISHED)
return true;
return false;
}
public static function addErrorMessage($task)
{
static $failure = false;
if ($task === false) {
if (!$failure) {
Message::addError('taskmanager-error');
$failure = true;
}
return;
}
if (!isset($task['statusCode'])) {
Message::addError('taskmanager-format');
return;
}
if (isset($task['data']['error'])) {
Message::addError('task-error', $task['statusCode'] . ' (' . $task['data']['error'] . ')');
return;
}
Message::addError('task-error', $task['statusCode']);
}
public static function release($taskId)
{
self::init();
$seq = (string) mt_rand();
$message = "$seq, release, $taskId";
socket_send(self::$sock, $message, strlen($message), 0);
}
/**
*
* @param type $seq
* @return mixed the decoded json data for that message as an array, or null on error
*/
private static function readReply($seq)
{
$tries = 0;
while (($bytes = socket_recvfrom(self::$sock, $buf, 90000, 0, $bla1, $bla2)) !== false) {
$parts = explode(',', $buf, 2);
if (count($parts) == 2 && $parts[0] == $seq) {
return json_decode($parts[1], true);
}
if (++$tries > 10)
return false;
}
//error_log(socket_strerror(socket_last_error(self::$sock)));
return false;
}
}
foreach (array('TASK_FINISHED', 'TASK_ERROR', 'TASK_WAITING', 'NO_SUCH_TASK', 'TASK_PROCESSING') as $i) {
define($i, $i);
}
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