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-rw-r--r--web/lib/cachefuncs.inc.php82
1 files changed, 82 insertions, 0 deletions
diff --git a/web/lib/cachefuncs.inc.php b/web/lib/cachefuncs.inc.php
new file mode 100644
index 0000000..3485b01
--- /dev/null
+++ b/web/lib/cachefuncs.inc.php
@@ -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;
+}
+
+?>