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<?php
/*
MIT License
Copyright (c) 2013 Timo Rothenpieler
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* Implememnts apc user-cache into Pheal
*/
class PhealApcCache implements PhealCacheInterface
{
/**
* check if apc caching is available
*/
public static function available()
{
if(extension_loaded("apc") && ini_get("apc.enabled") && php_sapi_name() != "cli")
return true;
return false;
}
/**
* construct PhealApcCache.
*/
public function __construct()
{
if(!extension_loaded("apc"))
throw new PhealException("Tried to initialize apc user cache, but apc extension is missing.");
if(!ini_get("apc.enabled"))
throw new PhealException("Tried to initialize apc user cache, but apc extension is not enabled.");
}
/**
* Calculate hash for given arguments.
* @param int $userid
* @param string $apikey
* @param string $scope
* @param string $name
* @param array $args
*/
protected static function calcHashKey($userid, $apikey, $scope, $name, $args)
{
return "PhealCache:" . hash("sha256", "::$userid:$apikey:$scope:$name::" . serialize($args) . "::");
}
/**
* Calculate ttl for xml.
* @param string $xml
*/
protected static function calcCacheTimeout($xml)
{
$tz = date_default_timezone_get();
date_default_timezone_set("UTC");
@$xml = new SimpleXMLElement($xml);
$dt = (int)strtotime($xml->cachedUntil);
$time = time();
date_default_timezone_set($tz);
$result = $dt - $time;
if($result <= 0) // Fall back to one hour
$result = 3600;
return $result;
}
/**
* Load XML from cache
* @param int $userid
* @param string $apikey
* @param string $scope
* @param string $name
* @param array $args
*/
public function load($userid, $apikey, $scope, $name, $args)
{
$hashKey = PhealApcCache::calcHashKey($userid, $apikey, $scope, $name, $args);
if(!apc_exists($hashKey))
return false;
return apc_fetch($hashKey);
}
/**
* Save XML in cache
* @param int $userid
* @param string $apikey
* @param string $scope
* @param string $name
* @param array $args
* @param string $xml
*/
public function save($userid, $apikey, $scope, $name, $args, $xml)
{
$hashKey = PhealApcCache::calcHashKey($userid, $apikey, $scope, $name, $args);
apc_store($hashKey, $xml, PhealApcCache::calcCacheTimeout($xml));
}
}
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