REST_Controller::_check_limit PHP Метод

    protected function _check_limit($controller_method)
    {
        // They are special, or it might not even have a limit
        if (empty($this->rest->ignore_limits) === FALSE) {
            // Everything is fine
            return TRUE;
        }
        $api_key = isset($this->rest->key) ? $this->rest->key : '';
        switch ($this->config->item('rest_limits_method')) {
            case 'IP_ADDRESS':
                $limited_uri = 'ip-address:' . $this->input->ip_address();
                $api_key = $this->input->ip_address();
                break;
            case 'API_KEY':
                $limited_uri = 'api-key:' . $api_key;
                break;
            case 'METHOD_NAME':
                $limited_uri = 'method-name:' . $controller_method;
                break;
            case 'ROUTED_URL':
            default:
                $limited_uri = $this->uri->ruri_string();
                if (strpos(strrev($limited_uri), strrev($this->response->format)) === 0) {
                    $limited_uri = substr($limited_uri, 0, -strlen($this->response->format) - 1);
                }
                $limited_uri = 'uri:' . $limited_uri . ':' . $this->request->method;
                // It's good to differentiate GET from PUT
                break;
        }
        if (isset($this->methods[$controller_method]['limit']) === FALSE) {
            // Everything is fine
            return TRUE;
        }
        // How many times can you get to this method in a defined time_limit (default: 1 hour)?
        $limit = $this->methods[$controller_method]['limit'];
        $time_limit = isset($this->methods[$controller_method]['time']) ? $this->methods[$controller_method]['time'] : 3600;
        // 3600 = 60 * 60
        // Get data about a keys' usage and limit to one row
        $result = $this->rest->db->where('uri', $limited_uri)->where('api_key', $api_key)->get($this->config->item('rest_limits_table'))->row();
        // No calls have been made for this key
        if ($result === NULL) {
            // Create a new row for the following key
            $this->rest->db->insert($this->config->item('rest_limits_table'), ['uri' => $limited_uri, 'api_key' => $api_key, 'count' => 1, 'hour_started' => time()]);
        } elseif ($result->hour_started < time() - $time_limit) {
            // Reset the started period and count
            $this->rest->db->where('uri', $limited_uri)->where('api_key', $api_key)->set('hour_started', time())->set('count', 1)->update($this->config->item('rest_limits_table'));
        } else {
            // The limit has been exceeded
            if ($result->count >= $limit) {
                return FALSE;
            }
            // Increase the count by one
            $this->rest->db->where('uri', $limited_uri)->where('api_key', $api_key)->set('count', 'count + 1', FALSE)->update($this->config->item('rest_limits_table'));
        }
        return TRUE;
    }