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<?php
/**
* @copyright Copyright (c) 2018 Robin Appelman <robin@icewind.nl>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace Icewind\Streams;
/**
* Wrapper that counts the amount of data read and written
*
* The following options should be passed in the context when opening the stream
* [
* 'callback' => [
* 'source' => resource
* 'callback' => function($readCount, $writeCount){}
* ]
* ]
*
* The callback will be called when the stream is closed
*/
class CountWrapper extends Wrapper {
/**
* @var int
*/
protected $readCount = 0;
/**
* @var int
*/
protected $writeCount = 0;
/**
* @var callable
*/
protected $callback;
/**
* Wraps a stream with the provided callbacks
*
* @param resource $source
* @param callable $callback
* @return resource
*
* @throws \BadMethodCallException
*/
public static function wrap($source, $callback) {
if (!is_callable($callback)) {
throw new \InvalidArgumentException('Invalid or missing callback');
}
$context = stream_context_create(array(
'count' => array(
'source' => $source,
'callback' => $callback
)
));
return Wrapper::wrapSource($source, $context, 'callback', '\Icewind\Streams\CountWrapper');
}
protected function open() {
$context = $this->loadContext('count');
$this->callback = $context['callback'];
return true;
}
public function dir_opendir($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);
$this->readCount += strlen($result);
return $result;
}
public function stream_write($data) {
$result = parent::stream_write($data);
$this->writeCount += strlen($data);
return $result;
}
public function stream_close() {
$result = parent::stream_close();
call_user_func($this->callback, $this->readCount, $this->writeCount);
return $result;
}
}
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