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<?php // phpcs:ignore
/*
Snapshots Locker Class
Dexcription: This locker class is used during process of Snapshot archive creation or restore. This utility creates a process lock file with information about the running process.
*/
if ( ! class_exists( 'Snapshot_Helper_Locker' ) ) {
class Snapshot_Helper_Locker {
private $lockFolder;
private $item_key;
private $data_item_key;
private $lock_fp;
private $has_lock;
private $locker_info = array();
public function __construct( $backupLockFolderFull, $item_key ) {
$this->lockFolder = trailingslashit( $backupLockFolderFull );
$this->item_key = $item_key;
$this->lockFileFull = $this->lockFolder . $this->item_key . ".lock";
$this->has_lock = false;
/*
c+ mode do not exist on php < 5.2.6
https://stackoverflow.com/questions/5682616/fopen-fread-and-flock
*/
/*
if file exists, open in read+ plus mode so we can try to lock it
-- opening in w+ would truncate the file *before* we could get a lock!
*/
if( version_compare( PHP_VERSION, '5.2.6' ) >= 0 ) {
$mode = 'c+';
} else {
//'c+' would be the ideal $mode to use, but that's only
//available in PHP >=5.2.6
$mode = file_exists( $this->lockFileFull ) ? 'r+' : 'w+';
//there's a small chance of a race condition here
// -- two processes could end up opening the file with 'w+'
}
// phpcs:ignore
$this->lock_fp = fopen( $this->lockFileFull, $mode );
$this->is_locked();
}
public function Snapshot_Controller_Locker( $backupLockFolderFull, $item_key ) {
$this->__construct( $backupLockFolderFull, $item_key );
}
public function __destruct() {
$this->unlock();
}
/**
* Sets lock on internal file pointer
*
* @return bool
*/
public function lock () {
return flock( $this->lock_fp, LOCK_EX | LOCK_NB );
}
/**
* Unsets internal pointer lock
*
* @return bool
*/
public function unlock () {
// See this bug on PHP flock third argument https://bugs.php.net/bug.php?id=31189&edit=2
if ( $this->lock_fp ) {
flock( $this->lock_fp, LOCK_UN );
// phpcs:ignore
fclose( $this->lock_fp );
unset( $this->lock_fp );
$this->lock_fp = false;
return true;
}
return false;
}
public function is_locked() {
if ( $this->lock_fp ) {
if ( $this->lock() ) {
$this->has_lock = true;
} else {
$this->has_lock = false;
}
}
return $this->has_lock;
}
public function set_locker_info( $locker_info = array() ) {
// Only the locking process can write to the file.
if ( $this->is_locked() ) {
rewind( $this->lock_fp );
$locker_info['time_start'] = time();
$locker_info['pid'] = mt_rand(0, 32000);
$write_ret = fwrite( $this->lock_fp, wp_json_encode( $locker_info, JSON_FORCE_OBJECT ) . "\r\n" ); // phpcs:ignore
fflush( $this->lock_fp );
}
}
public function get_locker_info( $info_key = '' ) {
if ( $this->lock_fp ) {
rewind( $this->lock_fp );
$locker_info = fgets( $this->lock_fp, 4096 );
if ( $locker_info ) {
$locker_info = json_decode( $locker_info, true );
$locker_info['has_lock'] = $this->is_locked();
if ( strlen( $info_key ) ) {
if ( isset( $locker_info[ $info_key ] ) ) {
return $locker_info[ $info_key ];
} else {
return false;
}
}
return $locker_info;
}
return false;
}
return false;
}
}
}