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<?php
/**
* Statistics handler class.
*
* This class is responsible for taking a statistics event and logging it.
*
* @package SimpleSAMLphp
*/
class SimpleSAML_Stats
{
/**
* Whether this class is initialized.
*
* @var boolean
*/
private static $initialized = false;
/**
* The statistics output callbacks.
*
* @var array
*/
private static $outputs = null;
/**
* Create an output from a configuration object.
*
* @param SimpleSAML_Configuration $config The configuration object.
*
* @return mixed A new instance of the configured class.
*/
private static function createOutput(SimpleSAML_Configuration $config)
{
$cls = $config->getString('class');
$cls = SimpleSAML\Module::resolveClass($cls, 'Stats_Output', 'SimpleSAML_Stats_Output');
$output = new $cls($config);
return $output;
}
/**
* Initialize the outputs.
*/
private static function initOutputs()
{
$config = SimpleSAML_Configuration::getInstance();
$outputCfgs = $config->getConfigList('statistics.out', array());
self::$outputs = array();
foreach ($outputCfgs as $cfg) {
self::$outputs[] = self::createOutput($cfg);
}
}
/**
* Notify about an event.
*
* @param string $event The event.
* @param array $data Event data. Optional.
*
* @return void|boolean False if output is not enabled, void otherwise.
*/
public static function log($event, array $data = array())
{
assert('is_string($event)');
assert('!isset($data["op"])');
assert('!isset($data["time"])');
assert('!isset($data["_id"])');
if (!self::$initialized) {
self::initOutputs();
self::$initialized = true;
}
if (empty(self::$outputs)) {
// not enabled
return;
}
$data['op'] = $event;
$data['time'] = microtime(true);
// the ID generation is designed to cluster IDs related in time close together
$int_t = (int) $data['time'];
$hd = openssl_random_pseudo_bytes(16);
$data['_id'] = sprintf('%016x%s', $int_t, bin2hex($hd));
foreach (self::$outputs as $out) {
$out->emit($data);
}
}
}
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