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<?php
/*
* Copyright 2014 Florian "Bluewind" Pritz <bluewind@server-speed.net>
*
* Licensed under AGPLv3
* (see COPYING for full license text)
*
*/
namespace service;
/**
* This class allows to change a temporary file and replace the original one atomically
*/
class storage {
private $path;
private $tempfile = NULL;
public function __construct($path)
{
assert(!is_dir($path));
$this->path = $path;
}
/**
* Create a temp file which can be written to.
*
* Call commit() once you are done writing.
* Call rollback() to remove the file and throw away any data written.
*
* Calling this multiple times will automatically rollback previous calls.
*
* @return temp file path
*/
public function begin()
{
if($this->tempfile !== NULL) {
$this->rollback();
}
$this->tempfile = $this->create_tempfile();
return $this->tempfile;
}
/**
* Create a temporary file. You'll need to remove it yourself when no longer needed.
*
* @return path to the temporary file
*/
private function create_tempfile()
{
$dir = dirname($this->get_file());
$prefix = basename($this->get_file());
if (!is_dir($dir)) {
mkdir($dir, 0777, true);
}
assert(is_dir($dir));
return tempnam($dir, $prefix);
}
/**
* Save the temporary file returned by begin() to the permanent path
* (supplied to the constructor) in an atomic fashion.
*/
public function commit()
{
$ret = rename($this->tempfile, $this->get_file());
if ($ret) {
$this->tempfile = NULL;
}
return $ret;
}
public function exists()
{
return file_exists($this->get_file());
}
public function get_file()
{
return $this->path;
}
/**
* Throw away any changes made to the temporary file returned by begin()
*/
public function rollback()
{
if ($this->tempfile !== NULL) {
unlink($this->tempfile);
$this->tempfile = NULL;
}
}
public function __destruct()
{
$this->rollback();
}
/**
* GZIPs the temp file
*
* From http://stackoverflow.com/questions/6073397/how-do-you-create-a-gz-file-using-php
* Based on function by Kioob at:
* http://www.php.net/manual/en/function.gzwrite.php#34955
*
* @param integer $level GZIP compression level (default: 6)
* @return boolean true if operation succeeds, false on error
*/
public function gzip_compress($level = 6){
if ($this->tempfile === NULL) {
return;
}
$source = $this->tempfile;
$file = new storage($source);
$dest = $file->begin();
$mode = 'wb' . $level;
$error = false;
$chunk_size = 1024*512;
if ($fp_out = gzopen($dest, $mode)) {
if ($fp_in = fopen($source,'rb')) {
while (!feof($fp_in)) {
gzwrite($fp_out, fread($fp_in, $chunk_size));
}
fclose($fp_in);
} else {
$error = true;
}
gzclose($fp_out);
} else {
$error = true;
}
if ($error) {
return false;
} else {
$file->commit();
return true;
}
}
/**
* Delete the file if it exists.
*/
public function unlink()
{
if ($this->exists()) {
unlink($this->get_file());
}
}
}
# vim: set noet:
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