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<?php
namespace Bitrix\Main\Data;
use Bitrix\Main;
class CacheEngineFiles
implements ICacheEngine, ICacheEngineStat
{
private $TTL;
//cache stats
private $written = false;
private $read = false;
private $path = '';
protected $useLock = false;
protected static $lockHandles = array();
/**
* Engine constructor.
* @param array $options Cache options.
*/
public function __construct($options = [])
{
$config = Main\Config\Configuration::getValue("cache");
if ($config && is_array($config) && isset($config["use_lock"]))
{
$this->useLock = (bool)$config["use_lock"];
}
if (!empty($options) && isset($options['actual_data']))
{
$this->useLock = !((bool) $options['actual_data']);
}
}
/**
* Returns number of bytes read from disk or false if there was no read operation.
*
* @return integer|false
*/
public function getReadBytes()
{
return $this->read;
}
/**
* Returns number of bytes written to disk or false if there was no write operation.
*
* @return integer|false
*/
public function getWrittenBytes()
{
return $this->written;
}
/**
* Returns physical file path after read or write operation.
*
* @return string
*/
public function getCachePath()
{
return $this->path;
}
/**
* Returns true if cache can be read or written.
*
* @return bool
*/
public function isAvailable()
{
return true;
}
/**
* Deletes physical file. Returns true on success.
*
* @param string $fileName Absolute physical path.
*
* @return boolean
*/
private static function unlink($fileName)
{
if (isset(self::$lockHandles[$fileName]) && self::$lockHandles[$fileName])
{
fclose(self::$lockHandles[$fileName]);
unset(self::$lockHandles[$fileName]);
}
//This checks for Zend Server CE in order to suppress warnings
if (function_exists('accelerator_reset'))
{
@chmod($fileName, BX_FILE_PERMISSIONS);
if (@unlink($fileName))
return true;
}
else
{
if (file_exists($fileName))
{
@chmod($fileName, BX_FILE_PERMISSIONS);
if (unlink($fileName))
return true;
}
}
return false;
}
/**
* Adds delayed delete worker agent.
*
* @return void
*/
private static function addAgent()
{
global $APPLICATION;
static $agentAdded = false;
if (!$agentAdded)
{
$agentAdded = true;
$agents = \CAgent::GetList(array("ID" => "DESC"), array("NAME" => "\\Bitrix\\Main\\Data\\CacheEngineFiles::delayedDelete(%"));
if (!$agents->Fetch())
{
$res = \CAgent::AddAgent(
"\\Bitrix\\Main\\Data\\CacheEngineFiles::delayedDelete();",
"main", //module
"Y", //period
1 //interval
);
if (!$res)
$APPLICATION->ResetException();
}
}
}
/**
* Generates very temporary file name by adding some random suffix to the file path.
* Returns empty string on failure.
*
* @param string $fileName File path within document root.
*
* @return string
*/
private static function randomizeFile($fileName)
{
$documentRoot = Main\Loader::getDocumentRoot();
for ($i = 0; $i < 99; $i++)
{
$suffix = rand(0, 999999);
if (!file_exists($documentRoot.$fileName.$suffix))
return $fileName.$suffix;
}
return "";
}
/**
* Cleans (removes) cache directory or file.
*
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
*
* @return void
*/
public function clean($baseDir, $initDir = '', $filename = '')
{
$documentRoot = Main\Loader::getDocumentRoot();
if (($filename !== false) && ($filename !== ""))
{
$result = static::unlink($documentRoot.$baseDir.$initDir.$filename);
if ($result)
{
Main\Application::resetAccelerator();
}
}
else
{
$initDir = trim($initDir, "/");
if ($initDir == "")
{
$sourceDir = $documentRoot."/".trim($baseDir, "/");
if (file_exists($sourceDir) && is_dir($sourceDir))
{
$dh = opendir($sourceDir);
if (is_resource($dh))
{
while ($entry = readdir($dh))
{
if (preg_match("/^(\\.|\\.\\.|.*\\.~\\d+)\$/", $entry))
continue;
if (is_dir($sourceDir."/".$entry))
static::clean($baseDir, $entry);
elseif (is_file($sourceDir."/".$entry))
static::unlink($sourceDir."/".$entry);
}
}
}
}
else
{
$source = "/".trim($baseDir, "/")."/".$initDir;
$source = rtrim($source, "/");
$delayedDelete = false;
if (!preg_match("/^(\\.|\\.\\.|.*\\.~\\d+)\$/", $source) && file_exists($documentRoot.$source))
{
if (is_file($documentRoot.$source))
{
static::unlink($documentRoot.$source);
}
else
{
$target = static::randomizeFile($source.".~");
if ($target != '')
{
$con = Main\Application::getConnection();
$con->queryExecute("INSERT INTO b_cache_tag (SITE_ID, CACHE_SALT, RELATIVE_PATH, TAG) VALUES ('*', '*', '".$con->getSqlHelper()->forSql($target)."', '*')");
if (@rename($documentRoot.$source, $documentRoot.$target))
{
$delayedDelete = true;
}
}
}
}
if ($delayedDelete)
static::addAgent();
else
DeleteDirFilesEx($baseDir.$initDir);
Main\Application::resetAccelerator();
}
}
}
/**
* Tries to put non blocking exclusive lock on the file.
* Returns true if file not exists, or lock was successfully got.
*
* @param string $fileName Absolute cache file path.
*
* @return boolean
*/
protected function lock($fileName)
{
$wouldBlock = 0;
self::$lockHandles[$fileName] = @fopen($fileName, "r+");
if (self::$lockHandles[$fileName])
{
flock(self::$lockHandles[$fileName], LOCK_EX | LOCK_NB, $wouldBlock);
//$wouldBlock === 1 someone else has the lock.
}
return $wouldBlock !== 1;
}
/**
* Releases the lock obtained by lock method.
*
* @param string $fileName Absolute cache file path.
*
* @return void
*/
protected function unlock($fileName)
{
if (self::$lockHandles[$fileName])
{
fclose(self::$lockHandles[$fileName]);
unset(self::$lockHandles[$fileName]);
}
}
/**
* Reads cache from the file. Returns true if file exists, not expired, and successfully read.
*
* @param mixed &$allVars Cached result.
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
* @param integer $TTL Expiration period in seconds.
*
* @return boolean
*/
public function read(&$allVars, $baseDir, $initDir, $filename, $TTL)
{
$documentRoot = Main\Loader::getDocumentRoot();
$fn = $documentRoot."/".ltrim($baseDir.$initDir, "/").$filename;
if (!file_exists($fn))
return false;
$ser_content = "";
$dateexpire = 0;
$datecreate = 0;
$zeroDanger = false;
$handle = null;
if (is_array($allVars))
{
$INCLUDE_FROM_CACHE = 'Y';
if (!@include($fn))
return false;
}
else
{
$handle = fopen($fn, "rb");
if (!$handle)
return false;
$datecreate = fread($handle, 2);
if ($datecreate == "BX")
{
$datecreate = fread($handle, 12);
$dateexpire = fread($handle, 12);
}
else
{
$datecreate .= fread($handle, 10);
}
}
/* We suppress warning here in order not to break the compression under Zend Server */
$this->read = @filesize($fn);
$this->path = $fn;
$res = true;
if (intval($datecreate) < (time() - $TTL))
{
if ($this->useLock)
{
if ($this->lock($fn))
{
$res = false;
}
}
else
{
$res = false;
}
}
if($res == true)
{
if (is_array($allVars))
{
$allVars = unserialize($ser_content);
}
else
{
$allVars = fread($handle, $this->read);
}
}
if($handle)
{
fclose($handle);
}
return $res;
}
/**
* Writes cache into the file.
*
* @param mixed $allVars Cached result.
* @param string $baseDir Base cache directory (usually /bitrix/cache).
* @param string $initDir Directory within base.
* @param string $filename File name.
* @param integer $TTL Expiration period in seconds.
*
* @return void
*/
public function write($allVars, $baseDir, $initDir, $filename, $TTL)
{
static $search = array("\\", "'", "\0");
static $replace = array("\\\\", "\\'", "'.chr(0).'");
$documentRoot = Main\Loader::getDocumentRoot();
$folder = $documentRoot."/".ltrim($baseDir.$initDir, "/");
$fn = $folder.$filename;
$fnTmp = $folder.md5(mt_rand()).".tmp";
if (!CheckDirPath($fn))
return;
if ($handle = fopen($fnTmp, "wb+"))
{
if (is_array($allVars))
{
$contents = "<?";
$contents .= "\nif(\$INCLUDE_FROM_CACHE!='Y')return false;";
$contents .= "\n\$datecreate = '".str_pad(time(), 12, "0", STR_PAD_LEFT)."';";
$contents .= "\n\$dateexpire = '".str_pad(time() + intval($TTL), 12, "0", STR_PAD_LEFT)."';";
$contents .= "\n\$ser_content = '".str_replace($search, $replace, serialize($allVars))."';";
$contents .= "\nreturn true;";
$contents .= "\n?>";
}
else
{
$contents = "BX".str_pad(time(), 12, "0", STR_PAD_LEFT).str_pad(time() + intval($this->TTL), 12, "0", STR_PAD_LEFT);
$contents .= $allVars;
}
$this->written = fwrite($handle, $contents);
$this->path = $fn;
$len = strlen($contents);
fclose($handle);
static::unlink($fn);
if ($this->written === $len)
rename($fnTmp, $fn);
static::unlink($fnTmp);
if ($this->useLock)
{
$this->unlock($fn);
}
}
}
/**
* Returns true if cache file has expired.
*
* @param string $path Absolute physical path.
*
* @return boolean
*/
public function isCacheExpired($path)
{
if (!file_exists($path))
{
return true;
}
$fileHandler = fopen($path, "rb");
if ($fileHandler)
{
$header = fread($fileHandler, 150);
fclose($fileHandler);
}
else
{
return true;
}
if (
preg_match("/dateexpire\\s*=\\s*'([\\d]+)'/im", $header, $match)
|| preg_match("/^BX\\d{12}(\\d{12})/", $header, $match)
|| preg_match("/^(\\d{12})/", $header, $match)
)
{
if ($match[1] == '' || doubleval($match[1]) < time())
return true;
}
return false;
}
/**
* Deletes one cache directory. Works no longer than etime.
*
* @param integer $etime Timestamp when to stop working.
* @param boolean $ar Record from b_cache_tag.
*
* @return void
*/
protected static function deleteOneDir($etime = 0, $ar = false)
{
$deleteFromQueue = false;
$dirName = Main\Loader::getDocumentRoot().$ar["RELATIVE_PATH"];
if ($ar["RELATIVE_PATH"] != '' && file_exists($dirName))
{
if (is_file($dirName))
{
DeleteDirFilesEx($ar["RELATIVE_PATH"]);
$deleteFromQueue = true;
}
else
{
$dh = opendir($dirName);
if (is_resource($dh))
{
$counter = 0;
while (($file = readdir($dh)) !== false)
{
if ($file != "." && $file != "..")
{
DeleteDirFilesEx($ar["RELATIVE_PATH"]."/".$file);
$counter++;
if (time() > $etime)
break;
}
}
closedir($dh);
if ($counter == 0)
{
rmdir($dirName);
$deleteFromQueue = true;
}
}
}
}
else
{
$deleteFromQueue = true;
}
if ($deleteFromQueue)
{
$con = Main\Application::getConnection();
$con->queryExecute("DELETE FROM b_cache_tag WHERE ID = ".intval($ar["ID"]));
}
}
/**
* Agent function which deletes marked cache directories.
*
* @param integer $count Desired delete count.
*
* @return string
*/
public static function delayedDelete($count = 1)
{
$con = Main\Application::getConnection();
$etime = time() + 2;
if ($count > 0)
{
$rs = $con->query("SELECT * from b_cache_tag WHERE TAG='*'", 0, $count);
while ($ar = $rs->fetch())
{
static::deleteOneDir($etime, $ar);
if (time() > $etime)
break;
}
}
//try to adjust cache cleanup speed to cache cleanups
$rs = $con->query("SELECT SITE_ID, CACHE_SALT, RELATIVE_PATH, TAG from b_cache_tag WHERE TAG='**'");
if ($ar = $rs->fetch())
{
$statRecFound = true;
$lastCount = intval($ar["RELATIVE_PATH"]);
if (preg_match("/:(\\d+)$/", $ar["RELATIVE_PATH"], $m))
$lastTime = intval($m[1]);
else
$lastTime = 0;
}
else
{
$statRecFound = false;
$lastCount = 0;
$lastTime = 0;
}
$toDeleteCount = $con->queryScalar("SELECT count(1) CNT from b_cache_tag WHERE TAG='*'");
$delta = $toDeleteCount - $lastCount;
if ($delta > 0)
{
$timeStep = ($lastTime > 0? time() - $lastTime: 0);
if ($timeStep <= 0)
$timeStep = 1;
$count = intval($toDeleteCount * $timeStep / 3600) + 1; //Rest of the queue in an hour
}
elseif ($count < 1)
{
$count = 1;
}
if ($statRecFound)
{
if ($lastCount != $toDeleteCount)
$con->queryExecute("UPDATE b_cache_tag SET RELATIVE_PATH='".$toDeleteCount.":".time()."' WHERE TAG='**'");
}
else
{
$con->queryExecute("INSERT INTO b_cache_tag (TAG, RELATIVE_PATH) VALUES ('**', '".$toDeleteCount.":".time()."')");
}
if ($toDeleteCount > 0)
return "\\Bitrix\\Main\\Data\\CacheEngineFiles::delayedDelete(".$count.");";
else
return "";
}
}