/**
* Execute an action, and in case of an error, erase whatever partial results
* have been accumulated, and replace it with an error message and a help screen.
*/
protected function executeActionWithErrorHandling()
{
// Verify the CORS header before executing the action
if (!$this->handleCORS()) {
// handleCORS() has sent a 403, abort
return;
}
// Exit here if the request method was OPTIONS
// (assume there will be a followup GET or POST)
if ($this->getRequest()->getMethod() === 'OPTIONS') {
return;
}
// In case an error occurs during data output,
// clear the output buffer and print just the error information
$obLevel = ob_get_level();
ob_start();
$t = microtime(true);
try {
$this->executeAction();
$isError = false;
} catch (Exception $e) {
$this->handleException($e);
$isError = true;
}
// Log the request whether or not there was an error
$this->logRequest(microtime(true) - $t);
// Commit DBs and send any related cookies and headers
MediaWiki::preOutputCommit($this->getContext());
// Send cache headers after any code which might generate an error, to
// avoid sending public cache headers for errors.
$this->sendCacheHeaders($isError);
// Executing the action might have already messed with the output
// buffers.
while (ob_get_level() > $obLevel) {
ob_end_flush();
}
}
