hook_sanitycheck.php

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<?php

function memcacheMonitor_hook_sanitycheck(&$hookinfo) {
        assert(is_array($hookinfo));
        assert(array_key_exists('errors', $hookinfo));
        assert(array_key_exists('info', $hookinfo));

        try {
                $servers = SimpleSAML_Memcache::getRawStats();
        } catch (Exception $e) {
                $hookinfo['errors'][] = '[memcacheMonitor] Error parsing memcache configuration: ' . $e->getMessage();
                return;
        }

        $allOK = TRUE;
        foreach ($servers as $group) {
                foreach ($group as $server => $status) {
                        if ($status === FALSE) {
                                $hookinfo['errors'][] = '[memcacheMonitor] No response from server: ' . $server;
                                $allOK = FALSE;
                        }
                }
        }

        if ($allOK) {
                $hookinfo['info'][] = '[memcacheMonitor] All servers responding.';
        }
}