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<?php
/* Icinga Web 2 | (c) 2021 Icinga GmbH | GPLv2+ */
namespace Icinga\Module\Monitoring\Hook;
use Closure;
use Exception;
use Icinga\Application\Hook;
use Icinga\Application\Logger;
use Icinga\Module\Monitoring\Object\MonitoredObject;
abstract class CustomVarRendererHook
{
/**
* Prefetch the data the hook needs to render custom variables
*
* @param MonitoredObject $object The object for which they'll be rendered
*
* @return bool Return true if the hook can render variables for the given object, false otherwise
*/
abstract public function prefetchForObject(MonitoredObject $object);
/**
* Render the given variable name
*
* @param string $key
*
* @return ?mixed
*/
abstract public function renderCustomVarKey($key);
/**
* Render the given variable value
*
* @param string $key
* @param mixed $value
*
* @return ?mixed
*/
abstract public function renderCustomVarValue($key, $value);
/**
* Return a group name for the given variable name
*
* @param string $key
*
* @return ?string
*/
abstract public function identifyCustomVarGroup($key);
/**
* Prepare available hooks to render custom variables of the given object
*
* @param MonitoredObject $object
*
* @return Closure A callback ($key, $value) which returns an array [$newKey, $newValue, $group]
*/
final public static function prepareForObject(MonitoredObject $object)
{
$hooks = [];
foreach (Hook::all('Monitoring/CustomVarRenderer') as $hook) {
/** @var self $hook */
try {
if ($hook->prefetchForObject($object)) {
$hooks[] = $hook;
}
} catch (Exception $e) {
Logger::error('Failed to load hook %s:', get_class($hook), $e);
}
}
return function ($key, $value) use ($hooks) {
$newKey = $key;
$newValue = $value;
$group = null;
foreach ($hooks as $hook) {
/** @var self $hook */
try {
$renderedKey = $hook->renderCustomVarKey($key);
$renderedValue = $hook->renderCustomVarValue($key, $value);
$group = $hook->identifyCustomVarGroup($key);
} catch (Exception $e) {
Logger::error('Failed to use hook %s:', get_class($hook), $e);
continue;
}
if ($renderedKey !== null || $renderedValue !== null) {
$newKey = $renderedKey !== null ? $renderedKey : $key;
$newValue = $renderedValue !== null ? $renderedValue : $value;
break;
}
}
return [$newKey, $newValue, $group];
};
}
}
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