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Make cache type selectable based on config value

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Provie a mechanism to specify cache type from NONE, APC, or MEMCACHE
based on a config variable.

If MEMCACHE type is selected, a list of servers can be specified to
provide multiserver support. Note that php-memcaced is required for
MEMCACHE support.

Lukas: Minor commenting style fixes.

Signed-off-by: Lukas Fleischer <archlinux@cryptocrack.de>
This commit is contained in:
elij 2011-05-29 23:27:55 +02:00 • committed by Lukas Fleischer
parent 888db089c5
commit 5853097561
3 changed files with 92 additions and 46 deletions
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82
web/lib/cachefuncs.inc.php Normal file
View file

@ -0,0 +1,82 @@
<?php
if (!defined('CACHE_TYPE')) {
define('CACHE_TYPE', 'NONE');
}
# Check if APC extension is loaded, and set cache prefix if it is.
if (CACHE_TYPE == 'APC' && !defined('EXTENSION_LOADED_APC')) {
define('EXTENSION_LOADED_APC', extension_loaded('apc'));
define('CACHE_PREFIX', 'aur:');
}
# Check if memcache extension is loaded, and set cache prefix if it is.
if (CACHE_TYPE == 'MEMCACHE' && !defined('EXTENSION_LOADED_MEMCACHE')) {
define('EXTENSION_LOADED_MEMCACHE', extension_loaded('memcached'));
define('CACHE_PREFIX', 'aur:');
global $memcache;
$memcache = new Memcached();
$mcs = defined('MEMCACHE_SERVERS') ? MEMCACHE_SERVERS : '127.0.0.1:11211';
foreach (explode(',', $mcs) as $elem) {
$telem = trim($elem);
$mcserver = explode(':', $telem);
$memcache->addServer($mcserver[0], intval($mcserver[1]));
}
}
# Set a value in the cache (currently APC) if cache is available for use. If
# not available, this becomes effectively a no-op (return value is
# false). Accepts an optional TTL (defaults to 600 seconds).
function set_cache_value($key, $value, $ttl=600) {
$status = false;
if (defined('EXTENSION_LOADED_APC')) {
$status = apc_store(CACHE_PREFIX.$key, $value, $ttl);
}
if (defined('EXTENSION_LOADED_MEMCACHE')) {
global $memcache;
$status = $memcache->set(CACHE_PREFIX.$key, $value, $ttl);
}
return $status;
}
# Get a value from the cache (currently APC) if cache is available for use. If
# not available, this returns false (optionally sets passed in variable $status
# to false, much like apc_fetch() behaves). This allows for testing the fetch
# result appropriately even in the event that a 'false' value was the value in
# the cache.
function get_cache_value($key, &$status=false) {
if(defined('EXTENSION_LOADED_APC')) {
$ret = apc_fetch(CACHE_PREFIX.$key, $status);
if ($status) {
return $ret;
}
}
if (defined('EXTENSION_LOADED_MEMCACHE')) {
global $memcache;
$ret = $memcache->get(CACHE_PREFIX.$key);
if (!$ret) {
$status = false;
}
else {
$status = true;
}
return $ret;
}
return $status;
}
# Run a simple db query, retrieving and/or caching the value if APC is
# available for use. Accepts an optional TTL value (defaults to 600 seconds).
function db_cache_value($dbq, $dbh, $key, $ttl=600) {
$status = false;
$value = get_cache_value($key, $status);
if (!$status) {
$result = db_query($dbq, $dbh);
$row = mysql_fetch_row($result);
$value = $row[0];
set_cache_value($key, $value, $ttl);
}
return $value;
}
?>