/**
* Tail -f for stdout or stderr for a process.
*
* @param Response $response
* @param Supervisor $instance
* @param string $process
* @param string $type
*
* @throws Exception
*/
private function getLog($response, $instance, $process, $type = 'Stdout')
{
$template = $this->app['twig']->loadTemplate(sprintf('layout/tail.twig'));
$response->setContent($template->render(['doNotClose' => true, 'baseUrl' => $this->app->getConfig('dir', '/')]))->sendContent();
//flush template to browser. Tmeplate is setup to use bigpipe so the connection doesn't close.
ob_flush();
flush();
if ($type != 'Stdout' && $type != 'Stderr') {
throw new Exception('Log type not supported');
}
$offset = -4096;
while (true) {
// Check if client is still connected.
if (connection_aborted()) {
return;
}
usleep(300000);
//0.3 s
//Get log until no more from last offset.
$bufferOverFlow = true;
while ($bufferOverFlow) {
list($string, $newoffset, $bufferOverFlow) = $instance->{'tailProcess' . $type . 'Log'}($process, $offset, 4096);
if (strlen($string) > 0) {
if ($offset > 0) {
$template = $this->app['twig']->loadTemplate(sprintf('layout/tailContent.twig'));
// Set content with <br/> for new lines and only send in offset difference.
// This is becuase tailProcessStdoutLog returns 4096 no matter what the offset is.
$twigVariables = ['string' => nl2br(substr($string, $offset - $newoffset))];
$response->setContent($template->render($twigVariables))->sendContent();
} else {
$template = $this->app['twig']->loadTemplate(sprintf('layout/tailContent.twig'));
$twigVariables = ['string' => nl2br($string)];
$response->setContent($template->render($twigVariables))->sendContent();
}
// Flush to browser.
ob_flush();
flush();
}
$offset = $newoffset;
}
}
}
