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<?php
/**
* Copyright (c) 2014 Robin Appelman <icewind@owncloud.com>
* This file is licensed under the Licensed under the MIT license:
* http://opensource.org/licenses/MIT
*/
namespace Icewind\Streams;
/**
* Wrapper that provides callbacks for write, read and close
*
* The following options should be passed in the context when opening the stream
* [
* 'callback' => [
* 'source' => resource
* 'read' => function($count){} (optional)
* 'write' => function($data){} (optional)
* 'close' => function(){} (optional)
* 'readdir' => function(){} (optional)
* ]
* ]
*
* All callbacks are called after the operation is executed on the source stream
*/
class CallbackWrapper extends Wrapper {
/**
* @var callable
*/
protected $readCallback;
/**
* @var callable
*/
protected $writeCallback;
/**
* @var callable
*/
protected $closeCallback;
/**
* @var callable
*/
protected $readDirCallBack;
/**
* @var callable
*/
protected $preCloseCallback;
/**
* Wraps a stream with the provided callbacks
*
* @param resource $source
* @param callable $read (optional)
* @param callable $write (optional)
* @param callable $close (optional)
* @param callable $readDir (optional)
* @return resource
*
* @throws \BadMethodCallException
*/
public static function wrap($source, $read = null, $write = null, $close = null, $readDir = null, $preClose = null) {
$context = stream_context_create(array(
'callback' => array(
'source' => $source,
'read' => $read,
'write' => $write,
'close' => $close,
'readDir' => $readDir,
'preClose' => $preClose,
)
));
return Wrapper::wrapSource($source, $context, 'callback', '\Icewind\Streams\CallbackWrapper');
}
protected function open() {
$context = $this->loadContext('callback');
$this->readCallback = $context['read'];
$this->writeCallback = $context['write'];
$this->closeCallback = $context['close'];
$this->readDirCallBack = $context['readDir'];
$this->preCloseCallback = $context['preClose'];
return true;
}
public function dir_opendir($path, $options) {
return $this->open();
}
public function stream_open($path, $mode, $options, &$opened_path) {
return $this->open();
}
public function stream_read($count) {
$result = parent::stream_read($count);
if (is_callable($this->readCallback)) {
call_user_func($this->readCallback, strlen($result));
}
return $result;
}
public function stream_write($data) {
$result = parent::stream_write($data);
if (is_callable($this->writeCallback)) {
call_user_func($this->writeCallback, $data);
}
return $result;
}
public function stream_close() {
if (is_callable($this->preCloseCallback)) {
call_user_func($this->preCloseCallback, $this->loadContext('callback')['source']);
// prevent further calls by potential PHP 7 GC ghosts
$this->preCloseCallback = null;
}
$result = parent::stream_close();
if (is_callable($this->closeCallback)) {
call_user_func($this->closeCallback);
// prevent further calls by potential PHP 7 GC ghosts
$this->closeCallback = null;
}
return $result;
}
public function dir_readdir() {
$result = parent::dir_readdir();
if (is_callable($this->readDirCallBack)) {
call_user_func($this->readDirCallBack);
}
return $result;
}
}