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1<?php
2/**
3 * This program is free software; you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation; either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
16 * http://www.gnu.org/copyleft/gpl.html
17 *
18 * @file
19 */
20
21use GuzzleHttp\Psr7\StreamDecoratorTrait;
22use GuzzleHttp\Psr7\Utils;
23use Psr\Http\Message\StreamInterface;
24
25/**
26 * Callback-aware stream.  Allows using a callback function to receive data in contexts where
27 * a PSR-7 stream is required.  This was created so that GuzzleHttpRequest can support our
28 * "callback" option, for backward compatibility.  Newer code that uses GuzzleHttpRequest
29 * should consider using the "sink" option instead.
30 *
31 * @internal for use by GuzzleHttpRequest only
32 * @since 1.33
33 * @property StreamInterface $stream Defined in StreamDecoratorTrait via `@property`, not read
34 *  by phan
35 */
36class MWCallbackStream implements StreamInterface {
37    use StreamDecoratorTrait;
38
39    private $callback;
40
41    /** @var StreamInterface */
42    protected $stream;
43
44    public function __construct( callable $cb ) {
45        $this->stream = Utils::streamFor();
46        $this->callback = $cb;
47    }
48
49    public function write( $string ) {
50        return call_user_func( $this->callback, $this, $string );
51    }
52}