MD_STD/MD_STD_CACHE.php

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<?PHP
/**
* Provides static functions for simple caching.
*
* @author Joshua Ramon Enslin <joshua@museum-digital.de>
*/
declare(strict_types = 1);
/**
* Provides caching functions.
*/
final class MD_STD_CACHE {
/** @var string */
public static string $redis_host = '127.0.0.1';
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/** @var integer */
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public static int $redis_port = 6379;
/**
* Shutdown function for caching contents of output buffer.
*
* @param string $redisKey Key to cache by in redis.
* @param integer $expiry Expiration time in seconds.
*
* @return void
*/
public static function shutdown_cache_through_redis(string $redisKey, int $expiry = 3600):void {
$outputT = trim(MD_STD::minimizeHTMLString(MD_STD::ob_get_clean()));
echo $outputT;
$redis = new Redis();
$redis->connect(self::$redis_host, self::$redis_port, 1, NULL, 0, 0, ['auth' => [MD_CONF::$redis_pw]]);
$redis->set($redisKey, $outputT);
$redis->expire($redisKey, $expiry);
$redis->close();
}
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/**
* Caches and serves a page through redis. Should be called at the start
* of the script generating a page.
*
* @param string $redisKey Key to cache by in redis.
* @param integer $expiry Expiration time in seconds.
*
* @return string
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*/
public static function serve_page_through_redis_cache(string $redisKey, int $expiry = 3600):string {
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if (PHP_SAPI === 'cli') return '';
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$redis = new Redis();
$redis->connect(self::$redis_host, self::$redis_port, 1, NULL, 0, 0, ['auth' => [MD_CONF::$redis_pw]]);
if ($redis->ping() !== false) {
ob_start();
if (($redisResult = $redis->get($redisKey))) {
if (strlen($redisResult) > 3) {
$redis->close();
return $redisResult;
}
else {
register_shutdown_function(function(string $redisKey, int $expiry = 3600) :void {
self::shutdown_cache_through_redis($redisKey, $expiry);
}, $redisKey);
}
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}
else {
register_shutdown_function(function(string $redisKey, int $expiry = 3600) :void {
self::shutdown_cache_through_redis($redisKey, $expiry);
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}, $redisKey);
}
}
$redis->close();
return '';
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}
}