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1283fe4918
The package provider and dependency queries are quite CPU-intensive and usually yield rather small result sets. Cache these values if the global caching mechanism is enabled. Signed-off-by: Lukas Fleischer <lfleischer@archlinux.org>
99 lines
3 KiB
PHP
99 lines
3 KiB
PHP
<?php
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# Check if APC extension is loaded, and set cache prefix if it is.
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if (config_get('options', 'cache') == 'apc' && !defined('EXTENSION_LOADED_APC')) {
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define('EXTENSION_LOADED_APC', extension_loaded('apc'));
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define('CACHE_PREFIX', 'aur:');
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}
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# Check if memcache extension is loaded, and set cache prefix if it is.
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if (config_get('options', 'cache') == 'memcache' && !defined('EXTENSION_LOADED_MEMCACHE')) {
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define('EXTENSION_LOADED_MEMCACHE', extension_loaded('memcached'));
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define('CACHE_PREFIX', 'aur:');
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global $memcache;
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$memcache = new Memcached();
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$mcs = config_get('options', 'memcache_servers');
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foreach (explode(',', $mcs) as $elem) {
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$telem = trim($elem);
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$mcserver = explode(':', $telem);
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$memcache->addServer($mcserver[0], intval($mcserver[1]));
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}
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}
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# Set a value in the cache (currently APC) if cache is available for use. If
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# not available, this becomes effectively a no-op (return value is
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# false). Accepts an optional TTL (defaults to 600 seconds).
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function set_cache_value($key, $value, $ttl=600) {
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$status = false;
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if (defined('EXTENSION_LOADED_APC')) {
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$status = apc_store(CACHE_PREFIX.$key, $value, $ttl);
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}
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if (defined('EXTENSION_LOADED_MEMCACHE')) {
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global $memcache;
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$status = $memcache->set(CACHE_PREFIX.$key, $value, $ttl);
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}
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return $status;
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}
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# Get a value from the cache (currently APC) if cache is available for use. If
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# not available, this returns false (optionally sets passed in variable $status
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# to false, much like apc_fetch() behaves). This allows for testing the fetch
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# result appropriately even in the event that a 'false' value was the value in
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# the cache.
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function get_cache_value($key, &$status=false) {
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if(defined('EXTENSION_LOADED_APC')) {
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$ret = apc_fetch(CACHE_PREFIX.$key, $status);
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if ($status) {
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return $ret;
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}
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}
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if (defined('EXTENSION_LOADED_MEMCACHE')) {
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global $memcache;
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$ret = $memcache->get(CACHE_PREFIX.$key);
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if (!$ret) {
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$status = false;
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}
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else {
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$status = true;
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}
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return $ret;
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}
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return $status;
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}
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# Run a simple db query, retrieving and/or caching the value if APC is
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# available for use. Accepts an optional TTL value (defaults to 600 seconds).
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function db_cache_value($dbq, $key, $ttl=600) {
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$dbh = DB::connect();
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$status = false;
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$value = get_cache_value($key, $status);
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if (!$status) {
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$result = $dbh->query($dbq);
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if (!$result) {
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return false;
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}
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$row = $result->fetch(PDO::FETCH_NUM);
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$value = $row[0];
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set_cache_value($key, $value, $ttl);
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}
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return $value;
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}
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# Run a simple db query, retrieving and/or caching the result set if APC is
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# available for use. Accepts an optional TTL value (defaults to 600 seconds).
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function db_cache_result($dbq, $key, $fetch_style=PDO::FETCH_NUM, $ttl=600) {
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$dbh = DB::connect();
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$status = false;
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$value = get_cache_value($key, $status);
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if (!$status) {
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$result = $dbh->query($dbq);
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if (!$result) {
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return false;
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}
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$value = $result->fetchAll($fetch_style);
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set_cache_value($key, $value, $ttl);
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}
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return $value;
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}
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?>
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