/**
* Collate Xenon traces and publish to Redis.
*
* To use ArcLamp, pass this function as the callback parameter to
* register_shutdown_function:
*
* <code>
* require_once('ArcLamp.php');
* register_shutdown_function('ArcLamp\logXenonData', ['localhost', 6379]);
* </code>
*
* @param Redis|array|string $redis A Redis instance, a Redis server name,
* or an array of arguments for Redis::connect.
*/
function logXenonData($redis = 'localhost')
{
if (!extension_loaded('xenon')) {
return;
}
$data = \HH\xenon_get_data();
if (!is_array($data) || !count($data)) {
return;
}
if ($redis instanceof \Redis) {
$conn = $redis;
} else {
$conn = new \Redis();
call_user_func_array(array($conn, 'connect'), (array) $redis);
}
if (!$conn) {
return;
}
foreach (combineSamples($data) as $stack => $count) {
$conn->publish('xenon', "{$stack} {$count}");
}
}
});
} else {
// 1:1000 request profiling
// $wgProfiler = array(
// 'class' => 'ProfilerXhprof',
// 'exclude' => array( 'section.*', 'run_init*' ),
// 'flags' => ( XHPROF_FLAGS_CPU | XHPROF_FLAGS_MEMORY | XHPROF_FLAGS_NO_BUILTINS ),
// 'output' => 'stats',
// 'prefix' => 'xhprof',
// 'sampling' => 10000,
// );
}
}
if (extension_loaded('xenon') && ini_get('hhvm.xenon.period')) {
register_shutdown_function(function () {
$data = HH\xenon_get_data();
if (empty($data)) {
return;
}
$entryPoint = basename($_SERVER['SCRIPT_NAME']);
// Collate stack samples and fold into single lines.
// This is the format expected by FlameGraph.
$stacks = array();
foreach ($data as $sample) {
$stack = array();
if (empty($sample['phpStack'])) {
continue;
}
foreach ($sample['phpStack'] as $frame) {
if ($frame['function'] === 'include') {
// For file scope, just use the path as the name.
