210 lines
6.3 KiB
PHP
210 lines
6.3 KiB
PHP
<?php
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/**
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* @file include/cache.php
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*
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* @brief Class for storing data for a short time
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*/
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use Friendica\Core\Config;
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use Friendica\Core\PConfig;
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class Cache {
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/**
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* @brief Check for memcache and open a connection if configured
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*
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* @return object|boolean The memcache object - or "false" if not successful
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*/
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public static function memcache() {
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if (!function_exists('memcache_connect')) {
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return false;
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}
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if (!Config::get('system', 'memcache')) {
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return false;
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}
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$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
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$memcache_port = Config::get('system', 'memcache_port', 11211);
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$memcache = new Memcache;
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if (!$memcache->connect($memcache_host, $memcache_port)) {
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return false;
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}
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return $memcache;
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}
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/**
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* @brief Return the duration for a given cache level
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*
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* @param integer $level Cache level
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*
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* @return integer The cache duration in seconds
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*/
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private static function duration($level) {
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switch($level) {
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case CACHE_MONTH;
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$seconds = 2592000;
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break;
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case CACHE_WEEK;
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$seconds = 604800;
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break;
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case CACHE_DAY;
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$seconds = 86400;
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break;
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case CACHE_HOUR;
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$seconds = 3600;
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break;
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case CACHE_HALF_HOUR;
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$seconds = 1800;
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break;
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case CACHE_QUARTER_HOUR;
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$seconds = 900;
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break;
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case CACHE_FIVE_MINUTES;
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$seconds = 300;
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break;
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case CACHE_MINUTE;
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$seconds = 60;
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break;
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}
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return $seconds;
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}
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/**
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* @brief Fetch cached data according to the key
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*
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* @param string $key The key to the cached data
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*
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* @return mixed Cached $value or "null" if not found
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*/
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public static function get($key) {
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$memcache = self::memcache();
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if (is_object($memcache)) {
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// We fetch with the hostname as key to avoid problems with other applications
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$cached = $memcache->get(get_app()->get_hostname().":".$key);
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$value = @unserialize($cached);
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// Only return a value if the serialized value is valid.
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// We also check if the db entry is a serialized
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// boolean 'false' value (which we want to return).
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if ($cached === serialize(false) || $value !== false) {
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return $value;
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}
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return null;
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}
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// Frequently clear cache
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self::clear($duration);
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$r = q("SELECT `v` FROM `cache` WHERE `k`='%s' LIMIT 1",
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dbesc($key)
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);
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if (dbm::is_result($r)) {
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$cached = $r[0]['v'];
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$value = @unserialize($cached);
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// Only return a value if the serialized value is valid.
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// We also check if the db entry is a serialized
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// boolean 'false' value (which we want to return).
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if ($cached === serialize(false) || $value !== false) {
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return $value;
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}
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}
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return null;
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}
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/**
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* @brief Put data in the cache according to the key
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*
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* The input $value can have multiple formats.
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*
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* @param string $key The key to the cached data
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* @param mixed $valie The value that is about to be stored
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* @param integer $duration The cache lifespan
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*/
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public static function set($key, $value, $duration = CACHE_MONTH) {
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// Do we have an installed memcache? Use it instead.
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$memcache = self::memcache();
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if (is_object($memcache)) {
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// We store with the hostname as key to avoid problems with other applications
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$memcache->set(get_app()->get_hostname().":".$key, serialize($value), MEMCACHE_COMPRESSED, self::duration($duration));
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return;
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}
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/// @todo store the cache data in the same way like the config data
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q("REPLACE INTO `cache` (`k`,`v`,`expire_mode`,`updated`) VALUES ('%s','%s',%d,'%s')",
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dbesc($key),
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dbesc(serialize($value)),
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intval($duration),
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dbesc(datetime_convert()));
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}
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/**
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* @brief Remove outdated data from the cache
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*
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* @param integer $maxlevel The maximum cache level that is to be cleared
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*/
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public static function clear($max_level = CACHE_MONTH) {
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// Clear long lasting cache entries only once a day
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if (get_config("system", "cache_cleared_day") < time() - self::duration(CACHE_DAY)) {
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if ($max_level == CACHE_MONTH) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 30 days")), intval(CACHE_MONTH));
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}
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if ($max_level <= CACHE_WEEK) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 7 days")), intval(CACHE_WEEK));
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}
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if ($max_level <= CACHE_DAY) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 1 days")), intval(CACHE_DAY));
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}
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set_config("system", "cache_cleared_day", time());
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}
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if (($max_level <= CACHE_HOUR) && (get_config("system", "cache_cleared_hour")) < time() - self::duration(CACHE_HOUR)) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 1 hours")), intval(CACHE_HOUR));
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set_config("system", "cache_cleared_hour", time());
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}
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if (($max_level <= CACHE_HALF_HOUR) && (get_config("system", "cache_cleared_half_hour")) < time() - self::duration(CACHE_HALF_HOUR)) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 30 minutes")), intval(CACHE_HALF_HOUR));
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set_config("system", "cache_cleared_half_hour", time());
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}
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if (($max_level <= CACHE_QUARTER_HOUR) && (get_config("system", "cache_cleared_quarter_hour")) < time() - self::duration(CACHE_QUARTER_HOUR)) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 15 minutes")), intval(CACHE_QUARTER_HOUR));
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set_config("system", "cache_cleared_quarter_hour", time());
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}
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if (($max_level <= CACHE_FIVE_MINUTES) && (get_config("system", "cache_cleared_five_minute")) < time() - self::duration(CACHE_FIVE_MINUTES)) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 5 minutes")), intval(CACHE_FIVE_MINUTES));
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set_config("system", "cache_cleared_five_minute", time());
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}
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if (($max_level <= CACHE_MINUTE) && (get_config("system", "cache_cleared_minute")) < time() - self::duration(CACHE_MINUTE)) {
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q("DELETE FROM `cache` WHERE `updated` < '%s' AND `expire_mode` = %d",
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dbesc(datetime_convert('UTC','UTC',"now - 1 minutes")), intval(CACHE_MINUTE));
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set_config("system", "cache_cleared_minute", time());
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}
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}
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}
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