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<?php
namespace WhichBrowser;
use Psr\Cache\CacheItemPoolInterface;
trait Cache
{
private $cache;
private $expires;
/**
* @var boolean $cached Was this result retrieve from the cache?
*/
public $cached = false;
/**
* Enable caching of results
*
* @param object $cache An PSR-6 cache pool (an object that implements Psr\Cache\CacheItemPoolInterface)
* @param int $expires Optional the number of seconds after which a cached item expires, default is 15 minutes
*/
public function setCache($cache, $expires = 900)
{
$this->cache = $cache;
$this->expires = $expires;
}
/**
* Apply cached data to the main Parser object
*
* @internal
*
* @param array $data An array with a key for every property it needs to apply
*/
private function applyCachedData($data)
{
foreach ($data as $key => $value) {
$this->$key = $value;
}
$this->cached = true;
}
/**
* Retrieve the data that can be cached from the main Parser object
*
* @internal
*
* @return array An array with a key for every property that will be cached
*/
private function retrieveCachedData()
{
return [
'browser' => $this->browser,
'engine' => $this->engine,
'os' => $this->os,
'device' => $this->device,
'camouflage' => $this->camouflage,
'features' => $this->features
];
}
/**
* Retrieve the result from the cache, or analyse and store in the cache
*
* @internal
*
* @param array|string $headers An array with all of the headers or a string with just the User-Agent header
*
* @return boolean did we actually retrieve or analyse results
*/
private function analyseWithCache($headers, $options = [])
{
if (isset($options['cache'])) {
if (isset($options['cacheExpires'])) {
$this->setCache($options['cache'], $options['cacheExpires']);
} else {
$this->setCache($options['cache']);
}
}
if ($this->cache instanceof CacheItemPoolInterface) {
$item = $this->cache->getItem('whichbrowser_' . md5(serialize($headers)));
if ($item->isHit()) {
$this->applyCachedData($item->get());
} else {
$analyser = new Analyser($headers, $options);
$analyser->setdata($this);
$analyser->analyse();
$item->set($this->retrieveCachedData());
$item->expiresAfter($this->expires);
$this->cache->save($item);
}
return true;
}
}
}