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<?php
/**
* Copyright (с) Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2022 All Rights Reserved
*
* Licensed under CLOUD LINUX LICENSE AGREEMENT
* https://www.cloudlinux.com/legal/
*/
namespace XrayProfiler;
if (! class_exists('\XrayProfiler\CollectorBlockingResources')) {
class CollectorBlockingResources extends Collector
{
/**
* Number of blocking CSS resources found.
*
* @var int
*/
private $css_resource_count = 0;
/**
* How many times empty buffer occurred.
*
* @var int
*/
private $empty_buffer_occurred = 0;
/**
* @var self|null
*/
private static $instance = null;
private function __construct()
{
$this->data = [
'css' => 0,
];
}
private function __clone()
{
}
/**
* @return self
*/
public static function instance()
{
if (is_null(self::$instance)) {
self::$instance = new self();
self::$instance->clean();
}
return self::$instance;
}
/**
* Filter the output buffer contents.
*
* @param string $buffer Contents of the output buffer.
*
* @return string
*/
public function startOutputBuffering($buffer)
{
if (empty($buffer)) {
$this->empty_buffer_occurred++;
return $buffer;
}
$this->scanForBlockingCss($buffer);
return $buffer;
}
/**
* Flush the output buffer.
*
* @return void
*/
public function stopOutputBuffering()
{
if (ob_get_contents()) {
ob_end_flush();
}
}
/**
* Looks for blocking CSS resources in given HTML code.
*
* The number of found resources is added to a local counter.
*
* @param string $html
*
* @return void
*/
private function scanForBlockingCss($html)
{
$parser = new CssResourceParser();
$parser->parse($html);
$this->css_resource_count += $parser->getCount();
}
/**
* @return array
*/
public function getData()
{
$value = $this->css_resource_count;
if (0 === $value && $this->empty_buffer_occurred > 0) {
$value = $this->empty_buffer_occurred * -1;
}
return [
'css' => $value,
];
}
/**
* {@inheritDoc}
*/
public function getXrayData()
{
return $this->getData();
}
/**
* {@inheritDoc}
*/
public function clean()
{
$this->css_resource_count = 0;
$this->empty_buffer_occurred = 0;
$this->data = [];
return $this;
}
}
}